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< title > Error Prone | PMD Source Code Analyzer< / title >
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< li class = "sidebarTitle" > PMD 7.8.0-SNAPSHOT< / li >
< div class = "sidebarTitleDate" > Release date: 29-November-2024< / div >
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< a href = "#" > About< / a >
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< li > < a href = "index.html" > Home< / a > < / li >
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< li > < a href = "pmd_release_notes.html" > Release notes< / a > < / li >
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< li > < a href = "pmd_release_notes_pmd7.html" > Release notes (PMD 7)< / a > < / li >
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< li > < a href = "pmd_about_help.html" > Getting help< / a > < / li >
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< li > < a href = "pmd_userdocs_migrating_to_pmd7.html" > Migration Guide for PMD 7< / a > < / li >
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< li > < a href = "pmd_userdocs_installation.html" > Installation and basic CLI usage< / a > < / li >
< li > < a href = "pmd_userdocs_making_rulesets.html" > Making rulesets< / a > < / li >
< li > < a href = "pmd_userdocs_configuring_rules.html" > Configuring rules< / a > < / li >
< li > < a href = "pmd_userdocs_best_practices.html" > Best practices< / a > < / li >
< li > < a href = "pmd_userdocs_suppressing_warnings.html" > Suppressing warnings< / a > < / li >
< li > < a href = "pmd_userdocs_incremental_analysis.html" > Incremental analysis< / a > < / li >
< li > < a href = "pmd_userdocs_cli_reference.html" > PMD CLI reference< / a > < / li >
< li > < a href = "pmd_userdocs_report_formats.html" > PMD Report formats< / a > < / li >
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< li > < a href = "pmd_userdocs_3rdpartyrulesets.html" > 3rd party rulesets< / a > < / li >
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< li class = "subfolders" >
< a href = "#" > CPD reference< / a >
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< li > < a href = "pmd_userdocs_cpd.html" > Copy-paste detection< / a > < / li >
< li > < a href = "pmd_userdocs_cpd_report_formats.html" > CPD Report formats< / a > < / li >
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< a href = "#" > Extending PMD< / a >
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< li > < a href = "pmd_userdocs_extending_writing_rules_intro.html" > Introduction to writing rules< / a > < / li >
< li > < a href = "pmd_userdocs_extending_your_first_rule.html" > Your first rule< / a > < / li >
< li > < a href = "pmd_userdocs_extending_writing_xpath_rules.html" > XPath rules< / a > < / li >
< li > < a href = "pmd_userdocs_extending_writing_java_rules.html" > Java rules< / a > < / li >
< li > < a href = "pmd_userdocs_extending_designer_reference.html" > Rule designer reference< / a > < / li >
< li > < a href = "pmd_userdocs_extending_defining_properties.html" > Defining rule properties< / a > < / li >
< li > < a href = "pmd_userdocs_extending_rule_guidelines.html" > Rule guidelines< / a > < / li >
< li > < a href = "pmd_userdocs_extending_testing.html" > Testing your rules< / a > < / li >
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< li > < a href = "pmd_userdocs_extending_ast_dump.html" > Creating (XML) dump of the AST< / a > < / li >
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< a href = "#" > Tools / Integrations< / a >
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< li > < a href = "pmd_userdocs_tools_maven.html" > Maven PMD Plugin< / a > < / li >
< li > < a href = "pmd_userdocs_tools_gradle.html" > Gradle< / a > < / li >
< li > < a href = "pmd_userdocs_tools_ant.html" > Ant< / a > < / li >
< li > < a href = "pmd_userdocs_tools_java_api.html" > PMD Java API< / a > < / li >
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< li > < a href = "pmd_userdocs_tools_bld.html" > bld PMD Extension< / a > < / li >
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< li > < a href = "pmd_userdocs_tools_ci.html" > CI integrations< / a > < / li >
< li > < a href = "pmd_userdocs_tools.html" > Other Tools / Integrations< / a > < / li >
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< li >
< a href = "#" > Rule Reference< / a >
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< a href = "#" > Apex Rules< / a >
< ul >
< li > < a href = "pmd_rules_apex.html" > Index< / a > < / li >
< li > < a href = "pmd_rules_apex_bestpractices.html" > Best Practices< / a > < / li >
< li > < a href = "pmd_rules_apex_codestyle.html" > Code Style< / a > < / li >
< li > < a href = "pmd_rules_apex_design.html" > Design< / a > < / li >
< li > < a href = "pmd_rules_apex_documentation.html" > Documentation< / a > < / li >
< li > < a href = "pmd_rules_apex_errorprone.html" > Error Prone< / a > < / li >
< li > < a href = "pmd_rules_apex_performance.html" > Performance< / a > < / li >
< li > < a href = "pmd_rules_apex_security.html" > Security< / a > < / li >
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< li class = "subfolders" >
< a href = "#" > HTML Rules< / a >
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< li > < a href = "pmd_rules_html.html" > Index< / a > < / li >
< li > < a href = "pmd_rules_html_bestpractices.html" > Best Practices< / a > < / li >
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< li class = "subfolders" >
< a href = "#" > Java Rules< / a >
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< li > < a href = "pmd_rules_java.html" > Index< / a > < / li >
< li > < a href = "pmd_rules_java_bestpractices.html" > Best Practices< / a > < / li >
< li > < a href = "pmd_rules_java_codestyle.html" > Code Style< / a > < / li >
< li > < a href = "pmd_rules_java_design.html" > Design< / a > < / li >
< li > < a href = "pmd_rules_java_documentation.html" > Documentation< / a > < / li >
< li > < a href = "pmd_rules_java_errorprone.html" > Error Prone< / a > < / li >
< li > < a href = "pmd_rules_java_multithreading.html" > Multithreading< / a > < / li >
< li > < a href = "pmd_rules_java_performance.html" > Performance< / a > < / li >
< li > < a href = "pmd_rules_java_security.html" > Security< / a > < / li >
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< li class = "subfolders" >
< a href = "#" > Java Server Pages Rules< / a >
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< li > < a href = "pmd_rules_jsp.html" > Index< / a > < / li >
< li > < a href = "pmd_rules_jsp_bestpractices.html" > Best Practices< / a > < / li >
< li > < a href = "pmd_rules_jsp_codestyle.html" > Code Style< / a > < / li >
< li > < a href = "pmd_rules_jsp_design.html" > Design< / a > < / li >
< li > < a href = "pmd_rules_jsp_errorprone.html" > Error Prone< / a > < / li >
< li > < a href = "pmd_rules_jsp_security.html" > Security< / a > < / li >
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< li class = "subfolders" >
< a href = "#" > JavaScript Rules< / a >
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< li > < a href = "pmd_rules_ecmascript.html" > Index< / a > < / li >
< li > < a href = "pmd_rules_ecmascript_bestpractices.html" > Best Practices< / a > < / li >
< li > < a href = "pmd_rules_ecmascript_codestyle.html" > Code Style< / a > < / li >
< li class = "active" > < a href = "pmd_rules_ecmascript_errorprone.html" > Error Prone< / a > < / li >
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< li > < a href = "pmd_rules_ecmascript_performance.html" > Performance< / a > < / li >
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< / ul >
< / li >
< li class = "subfolders" >
< a href = "#" > Kotlin Rules< / a >
< ul >
< li > < a href = "pmd_rules_kotlin.html" > Index< / a > < / li >
< li > < a href = "pmd_rules_kotlin_bestpractices.html" > Best Practices< / a > < / li >
< li > < a href = "pmd_rules_kotlin_errorprone.html" > Error Prone< / a > < / li >
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< / li >
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< li class = "subfolders" >
< a href = "#" > Maven POM Rules< / a >
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< li > < a href = "pmd_rules_pom.html" > Index< / a > < / li >
< li > < a href = "pmd_rules_pom_errorprone.html" > Error Prone< / a > < / li >
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< li class = "subfolders" >
< a href = "#" > Modelica Rules< / a >
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< li > < a href = "pmd_rules_modelica.html" > Index< / a > < / li >
< li > < a href = "pmd_rules_modelica_bestpractices.html" > Best Practices< / a > < / li >
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< / li >
< li class = "subfolders" >
< a href = "#" > PLSQL Rules< / a >
< ul >
< li > < a href = "pmd_rules_plsql.html" > Index< / a > < / li >
< li > < a href = "pmd_rules_plsql_bestpractices.html" > Best Practices< / a > < / li >
< li > < a href = "pmd_rules_plsql_codestyle.html" > Code Style< / a > < / li >
< li > < a href = "pmd_rules_plsql_design.html" > Design< / a > < / li >
< li > < a href = "pmd_rules_plsql_errorprone.html" > Error Prone< / a > < / li >
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< / li >
< li class = "subfolders" >
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< a href = "#" > Salesforce Visualforce Rules< / a >
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< ul >
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< li > < a href = "pmd_rules_visualforce.html" > Index< / a > < / li >
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< li > < a href = "pmd_rules_visualforce_security.html" > Security< / a > < / li >
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< / ul >
< / li >
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< li class = "subfolders" >
< a href = "#" > Scala Rules< / a >
< ul >
< li > < a href = "pmd_rules_scala.html" > Index< / a > < / li >
< / ul >
< / li >
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< li class = "subfolders" >
< a href = "#" > Swift Rules< / a >
< ul >
< li > < a href = "pmd_rules_swift.html" > Index< / a > < / li >
< li > < a href = "pmd_rules_swift_bestpractices.html" > Best Practices< / a > < / li >
< li > < a href = "pmd_rules_swift_errorprone.html" > Error Prone< / a > < / li >
< / ul >
< / li >
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< li class = "subfolders" >
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< a href = "#" > Velocity Template Language (VTL) Rules< / a >
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< ul >
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< li > < a href = "pmd_rules_velocity.html" > Index< / a > < / li >
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< li > < a href = "pmd_rules_velocity_bestpractices.html" > Best Practices< / a > < / li >
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< li > < a href = "pmd_rules_velocity_design.html" > Design< / a > < / li >
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< li > < a href = "pmd_rules_velocity_errorprone.html" > Error Prone< / a > < / li >
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< / li >
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< li class = "subfolders" >
< a href = "#" > WSDL Rules< / a >
< ul >
< li > < a href = "pmd_rules_wsdl.html" > Index< / a > < / li >
< / ul >
< / li >
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< li class = "subfolders" >
< a href = "#" > XML Rules< / a >
< ul >
< li > < a href = "pmd_rules_xml.html" > Index< / a > < / li >
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< li > < a href = "pmd_rules_xml_bestpractices.html" > Best Practices< / a > < / li >
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< li > < a href = "pmd_rules_xml_errorprone.html" > Error Prone< / a > < / li >
< / ul >
< / li >
< li class = "subfolders" >
< a href = "#" > XSL Rules< / a >
< ul >
< li > < a href = "pmd_rules_xsl.html" > Index< / a > < / li >
< li > < a href = "pmd_rules_xsl_codestyle.html" > Code Style< / a > < / li >
< li > < a href = "pmd_rules_xsl_performance.html" > Performance< / a > < / li >
< / ul >
< / li >
< / ul >
< / li >
< li >
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< a href = "#" > Language-Specific Documentation< / a >
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< ul >
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< li > < a href = "pmd_languages_index.html" > Overview< / a > < / li >
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< li > < a href = "pmd_languages_configuration.html" > Language configuration< / a > < / li >
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< li > < a href = "pmd_languages_apex.html" > Apex< / a > < / li >
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< li > < a href = "pmd_languages_cpp.html" > C/C++< / a > < / li >
< li > < a href = "pmd_languages_cs.html" > C#< / a > < / li >
< li > < a href = "pmd_languages_coco.html" > Coco< / a > < / li >
< li > < a href = "pmd_languages_dart.html" > Dart< / a > < / li >
< li > < a href = "pmd_languages_fortran.html" > Fortran< / a > < / li >
< li > < a href = "pmd_languages_gherkin.html" > Gherkin< / a > < / li >
< li > < a href = "pmd_languages_go.html" > Go< / a > < / li >
< li > < a href = "pmd_languages_html.html" > HTML< / a > < / li >
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< li > < a href = "pmd_languages_java.html" > Java< / a > < / li >
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< li > < a href = "pmd_languages_js_ts.html" > JavaScript / TypeScript< / a > < / li >
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< li > < a href = "pmd_languages_jsp.html" > JSP< / a > < / li >
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< li > < a href = "pmd_languages_julia.html" > Julia< / a > < / li >
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< li > < a href = "pmd_languages_kotlin.html" > Kotlin< / a > < / li >
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< li > < a href = "pmd_languages_lua.html" > Lua< / a > < / li >
< li > < a href = "pmd_languages_matlab.html" > Matlab< / a > < / li >
< li > < a href = "pmd_languages_modelica.html" > Modelica< / a > < / li >
< li > < a href = "pmd_languages_objectivec.html" > Objective-C< / a > < / li >
< li > < a href = "pmd_languages_perl.html" > Perl< / a > < / li >
< li > < a href = "pmd_languages_php.html" > PHP< / a > < / li >
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< li > < a href = "pmd_languages_plsql.html" > PLSQL< / a > < / li >
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< li > < a href = "pmd_languages_python.html" > Python< / a > < / li >
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< li > < a href = "pmd_languages_ruby.html" > Ruby< / a > < / li >
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< li > < a href = "pmd_languages_scala.html" > Scala< / a > < / li >
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< li > < a href = "pmd_languages_swift.html" > Swift< / a > < / li >
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< li > < a href = "pmd_languages_tsql.html" > T-SQL< / a > < / li >
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< li > < a href = "pmd_languages_visualforce.html" > Visualforce< / a > < / li >
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< li > < a href = "pmd_languages_velocity.html" > Velocity Template Language (VTL)< / a > < / li >
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< li > < a href = "pmd_languages_xml.html" > XML and XML dialects< / a > < / li >
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< / ul >
< / li >
< li >
< a href = "#" > Developer Documentation< / a >
< ul >
< li > < a href = "pmd_devdocs_development.html" > Developer resources< / a > < / li >
< li > < a href = "pmd_devdocs_building.html" > Building PMD from source< / a > < / li >
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< li > < a href = "https://github.com/pmd/pmd/blob/main/CONTRIBUTING.md" target = "_blank" > Contributing< / a > < / li >
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< li > < a href = "pmd_devdocs_writing_documentation.html" > Writing documentation< / a > < / li >
< li > < a href = "pmd_devdocs_roadmap.html" > Roadmap< / a > < / li >
< li > < a href = "pmd_devdocs_how_pmd_works.html" > How PMD works< / a > < / li >
< li > < a href = "pmd_devdocs_pmdtester.html" > Pmdtester< / a > < / li >
< li > < a href = "pmd_devdocs_rule_deprecation_policy.html" > Rule Deprecation Policy< / a > < / li >
< li class = "subfolders" >
< a href = "#" > Major contributions< / a >
< ul >
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< li > < a href = "pmd_devdocs_major_rule_guidelines.html" > Rule Guidelines< / a > < / li >
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< li > < a href = "pmd_devdocs_major_adding_new_language_javacc.html" > Adding a new language (JavaCC)< / a > < / li >
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< li > < a href = "pmd_devdocs_major_adding_new_language_antlr.html" > Adding a new language (ANTLR)< / a > < / li >
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< li > < a href = "pmd_devdocs_major_adding_new_cpd_language.html" > Adding a new CPD language< / a > < / li >
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< / ul >
< / li >
< li class = "subfolders" >
< a href = "#" > Experimental features< / a >
< ul >
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< li > < a href = "tag_experimental.html" > List of experimental Features< / a > < / li >
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< / ul >
< / li >
< / ul >
< / li >
< li >
< a href = "#" > Project documentation< / a >
< ul >
< li class = "subfolders" >
< a href = "#" > Trivia about PMD< / a >
< ul >
< li > < a href = "pmd_projectdocs_trivia_news.html" > PMD in the press< / a > < / li >
< li > < a href = "pmd_projectdocs_trivia_products.html" > Products & books related to PMD< / a > < / li >
< li > < a href = "pmd_projectdocs_trivia_similarprojects.html" > Similar projects< / a > < / li >
< li > < a href = "pmd_projectdocs_trivia_meaning.html" > What does 'PMD' mean?< / a > < / li >
< / ul >
< / li >
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< li > < a href = "pmd_projectdocs_logo.html" > Logo< / a > < / li >
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< li > < a href = "pmd_projectdocs_faq.html" > FAQ< / a > < / li >
< li > < a href = "license.html" > License< / a > < / li >
< li > < a href = "pmd_projectdocs_credits.html" > Credits< / a > < / li >
< li > < a href = "pmd_release_notes_old.html" > Old release notes< / a > < / li >
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< li > < a href = "pmd_projectdocs_decisions.html" > Decisions< / a > < / li >
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< li class = "subfolders" >
< a href = "#" > Project management< / a >
< ul >
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< li > < a href = "pmd_projectdocs_committers_infrastructure.html" > Infrastructure< / a > < / li >
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< li > < a href = "pmd_projectdocs_committers_releasing.html" > Release process< / a > < / li >
< li > < a href = "pmd_projectdocs_committers_merging_pull_requests.html" > Merging pull requests< / a > < / li >
< li > < a href = "pmd_projectdocs_committers_main_landing_page.html" > Main Landing page< / a > < / li >
< / ul >
< / li >
< / ul >
< / li >
< / ul >
2022-02-25 09:51:51 +00:00
< / div >
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2022-02-25 09:51:51 +00:00
<!-- Content Column -->
< div class = "col-md-9" id = "tg-sb-content" >
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< header >
< div class = "row" >
< div class = "col-lg-12" >
< a href = "./" role = "button"
>< i class = "fa fa-home fa-lg" > < /i
>< / a >
» Error Prone
< a
target="_blank"
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href="https://github.com/pmd/pmd/blob/main/docs/../pmd-javascript/src/main/resources/category/ecmascript/errorprone.xml"
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class="float-right"
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role="button"
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>< i class = "fab fa-github fa-lg" > < / i > Edit on GitHub< /a
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>
< / div >
< / div >
< hr / >
< / header >
< div class = "post-header" >
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< h1 class = "post-title-main" > Error Prone< / h1 >
< / div >
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< div class = "post-content" data-github-edit-url = "https://github.com/pmd/pmd/blob/main/docs/../pmd-javascript/src/main/resources/category/ecmascript/errorprone.xml" >
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< div class = "summary" > Rules to detect constructs that are either broken, extremely confusing or prone to runtime errors.< / div >
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< details id = "inline-toc-details" >
< summary > Table of Contents< / summary >
< div id = "inline-toc" > <!-- empty, move TOC here when screen size too small --> < / div >
< / details >
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2020-11-14 09:20:07 +00:00
<!-- DO NOT EDIT THIS FILE. This file is generated from file ../pmd - javascript/src/main/resources/category/ecmascript/errorprone.xml. -->
< h2 id = "avoidtrailingcomma" > AvoidTrailingComma< / h2 >
< p > < strong > Since:< / strong > PMD 5.1< / p >
< p > < strong > Priority:< / strong > High (1)< / p >
< p > This rule helps improve code portability due to differences in browser treatment of trailing commas in object or array literals.< / p >
< p > < strong > This rule is defined by the following XPath expression:< / strong > < / p >
< div class = "language-xpath highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "o" > //< / span > < span class = "nt" > ObjectLiteral< / span > < span class = "p" > [< / span > < span class = "nv" > $allowObjectLiteral< / span > < span class = "w" > < / span > < span class = "err" > =< / span > < span class = "w" > < / span > < span class = "nf" > false< / span > < span class = "p" > ()< / span > < span class = "w" > < / span > < span class = "ow" > and< / span > < span class = "w" > < / span > < span class = "na" > @TrailingComma< / span > < span class = "w" > < / span > < span class = "err" > =< / span > < span class = "w" > < / span > < span class = "nf" > true< / span > < span class = "p" > ()]< / span > < span class = "w" >
< / span > < span class = "p" > |< / span > < span class = "w" >
< / span > < span class = "o" > //< / span > < span class = "nt" > ArrayLiteral< / span > < span class = "p" > [< / span > < span class = "nv" > $allowArrayLiteral< / span > < span class = "w" > < / span > < span class = "err" > =< / span > < span class = "w" > < / span > < span class = "nf" > false< / span > < span class = "p" > ()< / span > < span class = "w" > < / span > < span class = "ow" > and< / span > < span class = "w" > < / span > < span class = "na" > @TrailingComma< / span > < span class = "w" > < / span > < span class = "err" > =< / span > < span class = "w" > < / span > < span class = "nf" > true< / span > < span class = "p" > ()]< / span > < span class = "w" >
< / span > < / code > < / pre > < / div > < / div >
< p > < strong > Example(s):< / strong > < / p >
< div class = "language-javascript highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "kd" > function< / span > < span class = "p" > (< / span > < span class = "nx" > arg< / span > < span class = "p" > )< / span > < span class = "p" > {< / span >
< span class = "kd" > var< / span > < span class = "nx" > obj1< / span > < span class = "o" > =< / span > < span class = "p" > {< / span > < span class = "na" > a< / span > < span class = "p" > :< / span > < span class = "mi" > 1< / span > < span class = "p" > };< / span > < span class = "c1" > // Ok< / span >
< span class = "kd" > var< / span > < span class = "nx" > arr1< / span > < span class = "o" > =< / span > < span class = "p" > [< / span > < span class = "mi" > 1< / span > < span class = "p" > ,< / span > < span class = "mi" > 2< / span > < span class = "p" > ];< / span > < span class = "c1" > // Ok< / span >
< span class = "kd" > var< / span > < span class = "nx" > obj2< / span > < span class = "o" > =< / span > < span class = "p" > {< / span > < span class = "na" > a< / span > < span class = "p" > :< / span > < span class = "mi" > 1< / span > < span class = "p" > ,< / span > < span class = "p" > };< / span > < span class = "c1" > // Syntax error in some browsers!< / span >
< span class = "kd" > var< / span > < span class = "nx" > arr2< / span > < span class = "o" > =< / span > < span class = "p" > [< / span > < span class = "mi" > 1< / span > < span class = "p" > ,< / span > < span class = "mi" > 2< / span > < span class = "p" > ,< / span > < span class = "p" > ];< / span > < span class = "c1" > // Length 2 or 3 depending on the browser!< / span >
< span class = "p" > }< / span >
< / code > < / pre > < / div > < / div >
< p > < strong > This rule has the following properties:< / strong > < / p >
< table >
< thead >
< tr >
< th > Name< / th >
< th > Default Value< / th >
< th > Description< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td > allowObjectLiteral< / td >
< td > false< / td >
< td > Allow a trailing comma within an object literal< / td >
< / tr >
< tr >
< td > allowArrayLiteral< / td >
< td > false< / td >
< td > Allow a trailing comma within an array literal< / td >
< / tr >
< / tbody >
< / table >
< p > < strong > Use this rule with the default properties by just referencing it:< / strong > < / p >
< div class = "language-xml highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "nt" > < rule< / span > < span class = "na" > ref=< / span > < span class = "s" > "category/ecmascript/errorprone.xml/AvoidTrailingComma"< / span > < span class = "nt" > /> < / span >
< / code > < / pre > < / div > < / div >
< p > < strong > Use this rule and customize it:< / strong > < / p >
< div class = "language-xml highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "nt" > < rule< / span > < span class = "na" > ref=< / span > < span class = "s" > "category/ecmascript/errorprone.xml/AvoidTrailingComma"< / span > < span class = "nt" > > < / span >
< span class = "nt" > < properties> < / span >
< span class = "nt" > < property< / span > < span class = "na" > name=< / span > < span class = "s" > "allowObjectLiteral"< / span > < span class = "na" > value=< / span > < span class = "s" > "false"< / span > < span class = "nt" > /> < / span >
< span class = "nt" > < property< / span > < span class = "na" > name=< / span > < span class = "s" > "allowArrayLiteral"< / span > < span class = "na" > value=< / span > < span class = "s" > "false"< / span > < span class = "nt" > /> < / span >
< span class = "nt" > < /properties> < / span >
< span class = "nt" > < /rule> < / span >
< / code > < / pre > < / div > < / div >
< h2 id = "equalcomparison" > EqualComparison< / h2 >
< p > < strong > Since:< / strong > PMD 5.0< / p >
< p > < strong > Priority:< / strong > Medium (3)< / p >
< p > Using == in condition may lead to unexpected results, as the variables are automatically casted to be of the
same type. The === operator avoids the casting.< / p >
< p > < strong > This rule is defined by the following XPath expression:< / strong > < / p >
< div class = "language-xpath highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "o" > //< / span > < span class = "nt" > InfixExpression< / span > < span class = "p" > [< / span > < span class = "w" >
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< / span > < span class = "p" > (< / span > < span class = "na" > @Operator< / span > < span class = "w" > < / span > < span class = "err" > =< / span > < span class = "w" > < / span > < span class = "s1" > '=='< / span > < span class = "w" > < / span > < span class = "ow" > or< / span > < span class = "w" > < / span > < span class = "na" > @Operator< / span > < span class = "w" > < / span > < span class = "err" > =< / span > < span class = "w" > < / span > < span class = "s1" > '!='< / span > < span class = "p" > )< / span > < span class = "w" >
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< / span > < span class = "ow" > and< / span > < span class = "w" >
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< / span > < span class = "p" > (< / span > < span class = "nt" > KeywordLiteral< / span > < span class = "p" > [< / span > < span class = "na" > @Literal< / span > < span class = "w" > < / span > < span class = "err" > =< / span > < span class = "w" > < / span > < span class = "s1" > 'true'< / span > < span class = "w" > < / span > < span class = "ow" > or< / span > < span class = "w" > < / span > < span class = "na" > @Literal< / span > < span class = "w" > < / span > < span class = "err" > =< / span > < span class = "w" > < / span > < span class = "s1" > 'false'< / span > < span class = "p" > ]< / span > < span class = "w" > < / span > < span class = "ow" > or< / span > < span class = "w" > < / span > < span class = "nt" > NumberLiteral< / span > < span class = "p" > )< / span > < span class = "w" >
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< / span > < span class = "p" > ]< / span > < span class = "w" >
< / span > < / code > < / pre > < / div > < / div >
< p > < strong > Example(s):< / strong > < / p >
< div class = "language-javascript highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "c1" > // Ok< / span >
< span class = "k" > if< / span > < span class = "p" > (< / span > < span class = "nx" > someVar< / span > < span class = "o" > ===< / span > < span class = "kc" > true< / span > < span class = "p" > )< / span > < span class = "p" > {< / span >
< span class = "p" > ...< / span >
< span class = "p" > }< / span >
< span class = "c1" > // Ok< / span >
< span class = "k" > if< / span > < span class = "p" > (< / span > < span class = "nx" > someVar< / span > < span class = "o" > !==< / span > < span class = "mi" > 3< / span > < span class = "p" > )< / span > < span class = "p" > {< / span >
< span class = "p" > ...< / span >
< span class = "p" > }< / span >
< span class = "c1" > // Bad< / span >
< span class = "k" > if< / span > < span class = "p" > (< / span > < span class = "nx" > someVar< / span > < span class = "o" > ==< / span > < span class = "kc" > true< / span > < span class = "p" > )< / span > < span class = "p" > {< / span >
< span class = "p" > ...< / span >
< span class = "p" > }< / span >
< span class = "c1" > // Bad< / span >
< span class = "k" > if< / span > < span class = "p" > (< / span > < span class = "nx" > someVar< / span > < span class = "o" > !=< / span > < span class = "mi" > 3< / span > < span class = "p" > )< / span > < span class = "p" > {< / span >
< span class = "p" > ...< / span >
< span class = "p" > }< / span >
< / code > < / pre > < / div > < / div >
< p > < strong > Use this rule by referencing it:< / strong > < / p >
< div class = "language-xml highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "nt" > < rule< / span > < span class = "na" > ref=< / span > < span class = "s" > "category/ecmascript/errorprone.xml/EqualComparison"< / span > < span class = "nt" > /> < / span >
< / code > < / pre > < / div > < / div >
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< h2 id = "inaccuratenumericliteral" > InaccurateNumericLiteral< / h2 >
< p > < strong > Since:< / strong > PMD 5.0< / p >
< p > < strong > Priority:< / strong > Medium High (2)< / p >
< p > The numeric literal will have a different value at runtime, which can happen if you provide too much
precision in a floating point number. This may result in numeric calculations being in error.< / p >
< p > < a href = "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number" > Numbers< / a > in JavaScript
are represented by 64bit double-precision floating point numbers internally and that’
to the available precision of the number.
See < a href = "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isSafeInteger" > Number.isSafeInteger()< / a >
and < a href = "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/EPSILON" > Number.EPSILON< / a > .< / p >
< p > Note: This rule was named InnaccurateNumericLiteral before PMD 7.4.0.< / p >
< p > < strong > This rule is defined by the following XPath expression:< / strong > < / p >
< div class = "language-xpath highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "o" > //< / span > < span class = "nt" > NumberLiteral< / span > < span class = "p" > [< / span > < span class = "na" > @Inaccurate< / span > < span class = "w" > < / span > < span class = "err" > =< / span > < span class = "w" > < / span > < span class = "nf" > true< / span > < span class = "p" > ()]< / span > < span class = "w" >
< / span > < / code > < / pre > < / div > < / div >
< p > < strong > Example(s):< / strong > < / p >
< div class = "language-javascript highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "kd" > var< / span > < span class = "nx" > a< / span > < span class = "o" > =< / span > < span class = "mi" > 9< / span > < span class = "p" > ;< / span > < span class = "c1" > // Ok< / span >
< span class = "kd" > var< / span > < span class = "nx" > b< / span > < span class = "o" > =< / span > < span class = "mi" > 999999999999999< / span > < span class = "p" > ;< / span > < span class = "c1" > // Ok< / span >
< span class = "kd" > var< / span > < span class = "nx" > c< / span > < span class = "o" > =< / span > < span class = "mi" > 999999999999999999999< / span > < span class = "p" > ;< / span > < span class = "c1" > // Not good< / span >
< span class = "kd" > var< / span > < span class = "nx" > w< / span > < span class = "o" > =< / span > < span class = "mf" > 1.12< / span > < span class = "nx" > e< / span > < span class = "o" > -< / span > < span class = "mi" > 4< / span > < span class = "p" > ;< / span > < span class = "c1" > // Ok< / span >
< span class = "kd" > var< / span > < span class = "nx" > x< / span > < span class = "o" > =< / span > < span class = "mf" > 1.12< / span > < span class = "p" > ;< / span > < span class = "c1" > // Ok< / span >
< span class = "kd" > var< / span > < span class = "nx" > y< / span > < span class = "o" > =< / span > < span class = "mf" > 1.1234567890123< / span > < span class = "p" > ;< / span > < span class = "c1" > // Ok< / span >
< span class = "kd" > var< / span > < span class = "nx" > z< / span > < span class = "o" > =< / span > < span class = "mf" > 1.12345678901234567< / span > < span class = "p" > ;< / span > < span class = "c1" > // Not good< / span >
< / code > < / pre > < / div > < / div >
< p > < strong > Use this rule by referencing it:< / strong > < / p >
< div class = "language-xml highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "nt" > < rule< / span > < span class = "na" > ref=< / span > < span class = "s" > "category/ecmascript/errorprone.xml/InaccurateNumericLiteral"< / span > < span class = "nt" > /> < / span >
< / code > < / pre > < / div > < / div >
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< h2 id = "innaccuratenumericliteral" > InnaccurateNumericLiteral< / h2 >
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< p > < span style = "border-radius: 0.25em; color: #fff; padding: 0.2em 0.6em 0.3em; display: inline; background-color: #d9534f;" > Deprecated< / span > < / p >
< p > This rule has been renamed. Use instead: < a href = "#inaccuratenumericliteral" > InaccurateNumericLiteral< / a > < / p >
< p > < span style = "border-radius: 0.25em; color: #fff; padding: 0.2em 0.6em 0.3em; display: inline; background-color: #d9534f;" > Deprecated< / span > < / p >
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< p > < strong > Since:< / strong > PMD 5.0< / p >
< p > < strong > Priority:< / strong > Medium High (2)< / p >
< p > The numeric literal will have a different value at runtime, which can happen if you provide too much
precision in a floating point number. This may result in numeric calculations being in error.< / p >
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< p > < a href = "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number" > Numbers< / a > in JavaScript
are represented by 64bit double-precision floating point numbers internally and that’
to the available precision of the number.
See < a href = "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isSafeInteger" > Number.isSafeInteger()< / a >
and < a href = "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/EPSILON" > Number.EPSILON< / a > .< / p >
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< p > Note: This rule was named InnaccurateNumericLiteral before PMD 7.4.0.< / p >
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< p > < strong > This rule is defined by the following XPath expression:< / strong > < / p >
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< div class = "language-xpath highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "o" > //< / span > < span class = "nt" > NumberLiteral< / span > < span class = "p" > [< / span > < span class = "na" > @Inaccurate< / span > < span class = "w" > < / span > < span class = "err" > =< / span > < span class = "w" > < / span > < span class = "nf" > true< / span > < span class = "p" > ()]< / span > < span class = "w" >
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< / span > < / code > < / pre > < / div > < / div >
< p > < strong > Example(s):< / strong > < / p >
< div class = "language-javascript highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "kd" > var< / span > < span class = "nx" > a< / span > < span class = "o" > =< / span > < span class = "mi" > 9< / span > < span class = "p" > ;< / span > < span class = "c1" > // Ok< / span >
< span class = "kd" > var< / span > < span class = "nx" > b< / span > < span class = "o" > =< / span > < span class = "mi" > 999999999999999< / span > < span class = "p" > ;< / span > < span class = "c1" > // Ok< / span >
< span class = "kd" > var< / span > < span class = "nx" > c< / span > < span class = "o" > =< / span > < span class = "mi" > 999999999999999999999< / span > < span class = "p" > ;< / span > < span class = "c1" > // Not good< / span >
< span class = "kd" > var< / span > < span class = "nx" > w< / span > < span class = "o" > =< / span > < span class = "mf" > 1.12< / span > < span class = "nx" > e< / span > < span class = "o" > -< / span > < span class = "mi" > 4< / span > < span class = "p" > ;< / span > < span class = "c1" > // Ok< / span >
< span class = "kd" > var< / span > < span class = "nx" > x< / span > < span class = "o" > =< / span > < span class = "mf" > 1.12< / span > < span class = "p" > ;< / span > < span class = "c1" > // Ok< / span >
< span class = "kd" > var< / span > < span class = "nx" > y< / span > < span class = "o" > =< / span > < span class = "mf" > 1.1234567890123< / span > < span class = "p" > ;< / span > < span class = "c1" > // Ok< / span >
< span class = "kd" > var< / span > < span class = "nx" > z< / span > < span class = "o" > =< / span > < span class = "mf" > 1.12345678901234567< / span > < span class = "p" > ;< / span > < span class = "c1" > // Not good< / span >
< / code > < / pre > < / div > < / div >
< p > < strong > Use this rule by referencing it:< / strong > < / p >
< div class = "language-xml highlighter-rouge" > < div class = "highlight" > < pre class = "highlight" > < code > < span class = "nt" > < rule< / span > < span class = "na" > ref=< / span > < span class = "s" > "category/ecmascript/errorprone.xml/InnaccurateNumericLiteral"< / span > < span class = "nt" > /> < / span >
< / code > < / pre > < / div > < / div >
< div class = "tags" >
< / div >
< / div >
< footer >
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< hr / >
< div >
This documentation is written in markdown. < br / >
If there is something missing or can be improved, edit this page on
github and create a PR:
< a
target="_blank"
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href="https://github.com/pmd/pmd/blob/main/docs/../pmd-javascript/src/main/resources/category/ecmascript/errorprone.xml"
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role="button"
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>< i class = "fab fa-github fa-lg" > < / i > Edit on GitHub< /a
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>
< / div >
< hr / >
< div class = "row" >
< div class = "col-lg-12 footer" >
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© 2024 PMD Open Source Project. All rights
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reserved. < br / >
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Site last generated: Nov 21, 2024 < br / >
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< p >
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< img src = "images/logo/pmd-logo-70px.png" alt = "PMD
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logo"/>
< / p >
< / div >
< / div >
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< / footer >
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< / div >
<!-- /.row -->
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< / div >
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<!-- /.container -->
< / div >
<!-- Sticky TOC column -->
< div class = "toc-col" >
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< div id = "toc" > < / div >
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< / div >
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<!-- /.toc - container - wrapper -->
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< / div >
< / div >
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< script type = "application/javascript" src = "assets/jquery-3.5.1/jquery-3.5.1.min.js" > < / script >
< script type = "application/javascript" src = "assets/anchorjs-4.2.2/anchor.min.js" > < / script >
< script type = "application/javascript" src = "assets/navgoco-0.2.1/src/jquery.navgoco.min.js" > < / script >
< script type = "application/javascript" src = "assets/bootstrap-4.5.2-dist/js/bootstrap.bundle.min.js" > < / script >
< script type = "application/javascript" src = "assets/Simple-Jekyll-Search-1.0.8/dest/jekyll-search.js" > < / script >
< script type = "application/javascript" src = "assets/jekyll-table-of-contents/toc.js" > < / script >
< script type = "application/javascript" src = "js/tabstate.js" > < / script >
< script type = "application/javascript" src = "js/customscripts.js" > < / script >
< / body >
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< / html >
