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pmd/docs/pages/release_notes.md
Juan Martín Sotuyo Dodero e055416aaa Merge branch 'pr-645'
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PMD Release Notes pmd_release_notes.html changelog, release notes

????? - 6.0.0-SNAPSHOT

The PMD team is pleased to announce PMD 6.0.0.

This is a major release.

Table Of Contents

New and noteworthy

Java 9 support

The Java grammar has been updated to support analyzing Java 9 projects:

  • private methods in interfaces are possible
  • The underscore "_" is considered an invalid identifier
  • Diamond operator for anonymous classes
  • The module declarations in module-info.java can be parsed
  • Concise try-with-resources statements are supported

Java 9 support is enabled by default. You can switch back to an older java version via the command line, e.g. -language java -version 1.8.

Revamped Apex CPD

We are now using the Apex Jorje Lexer to tokenize Apex code for CPD. This change means:

  • All comments are now ignored for CPD. This is consistent with how other languages such as Java and Groovy work.
  • Tokenization honors the language specification, which improves accuracy.

CPD will therefore have less false positives and false negatives.

Java Type Resolution

As part of Google Summer of Code 2017, Bendegúz Nagy's work on type resolution for Java continues. For this release he has extended support for method calls for both instance and static methods.

Method shadowing and overloading are supported, as are varargs. However, the selection of the target method upon the presence of generics and type inference is still work in progress. Expect it in forecoming releases.

As for fields, the basic support was in place for release 5.8.0, but has now been expanded to support static fields.

Metrics Framework

As part of Google Summer of Code 2017, Clément Fournier is continuing his work on the new metrics framework for object-oriented metrics.

There are already a couple of metrics (e.g. ATFD, WMC, Cyclo, LoC) implemented. More metrics are planned. Based on those metrics, rules like "GodClass" detection can be implemented more easily.

The Metrics framework has been abstracted and is available in pmd-core for other languages. With this PMD release, the metrics framework is supported for both Java and Apex.

Error Reporting

A number of improvements on error reporting have taken place, meaning changes to some of the report formats.

Also of note, the xml report now provides a XML Schema definition, allowing easier parsing and validation.

Processing Errors

Processing errors can now provide not only the message previously included on some reports, but also a full stacktrace. This will allow better error reports when providing feedback to the PMD team and help in debugging issues.

The report formats providing full stacktrace of errors are:

  • html
  • summaryhtml
  • textcolor
  • vbhtml
  • xml
Configuration Errors

For a long time reports have been notified of configuration errors on rules, but they have remained hidden. On a push to make these more evident to users, and help them get the best results out of PMD, we have started to include them on the reports.

So far, only reports that include processing errors are showing configuration errors. In other words, the report formats providing configuration error reporting are:

  • csv
  • html
  • summaryhtml
  • text
  • textcolor
  • vbhtml
  • xml

As we move forward we will be able to detect and report more configuration errors (ie: incomplete auxclasspath) and include them to such reports.

New Rules

  • The rule NcssCount (ruleset java-codesize) replaces the three rules "NcssConstructorCount", "NcssMethodCount", and "NcssTypeCount". The new rule uses the metrics framework to achieve the same. It has two properties, to define the report level for method and class sizes separately. Constructors and methods are considered the same.

  • The new rule ForLoopCanBeForeach (ruleset java-migration) helps to identify those for-loops that can be safely refactored into for-each-loops available since java 1.5.

Modified Rules

  • The rule UnnecessaryFinalModifier (ruleset java-unnecessarycode) has been revamped to detect more cases. It will now flag anonymous class' methods marked as final (can't be overridden, so it's pointless), along with final methods overridden / defined within enum instances.

  • The rule UnnecessaryParentheses (ruleset java-controversial) has been merged into UselessParentheses (ruleset java-unnecessary). The rule covers all scenarios previously covered by either rule.

  • The rule UncommentedEmptyConstructor (ruleset java-design) will now ignore empty constructors annotated with javax.inject.Inject.

  • The rule AbstractClassWithoutAnyMethod (ruleset java-design) will now ignore classes annotated with com.google.auto.value.AutoValue.

  • The rule GodClass (ruleset java-design) has been revamped to use the new metrics framework.

Deprecated Rules

  • The rules NcssConstructorCount, NcssMethodCount, and NcssTypeCount (ruleset java-codesize) have been deprecated. They will be replaced by the new rule NcssCount in the same ruleset.

Removed Rules

  • The deprecated rule UseSingleton has been removed from the ruleset java-design. The rule has been renamed long time ago to UseUtilityClass.

Java Symbol Table

A bug in symbol table prevented the symbol table analysis to properly match primitive arrays types. The issue affected the java-unsedcode/UnusedPrivateMethod rule, but other rules may now produce improved results as consequence of this fix.

Apex Parser Update

The Apex parser version was bumped, from 1.0-sfdc-187 to 1.0-sfdc-224. This update let us take full advantage of the latest improvements from Salesforce, but introduces some breaking changes:

  • BlockStatements are now created for all control structures, even if no brace is used. We have therefore added a hasCurlyBrace method to differentiate between both scenarios.
  • New AST node types are available. In particular CastExpression, ConstructorPreamble, IllegalStoreExpression, MethodBlockStatement, Modifier, MultiStatement, NestedExpression, NestedStoreExpression, NewKeyValueObjectExpression and StatementExecuted
  • Some nodes have been removed. Such is the case of TestNode, DottedExpression and NewNameValueObjectExpression (replaced by NewKeyValueObjectExpression)

All existing rules have been updated to reflect these changes. If you have custom rules, be sure to update them.

Incremental Analysis

The incremental analysis feature first introduced in PMD 5.6.0 has been enhanced. A few minor issues have been fixed, and several improvements have been performed to make it more accurate.

The cache will now detect changes to the JARs referenced in the auxclasspath instead of simply looking at their paths and order. This means that if you are referencing a JAR you are overwriting in some way, the incremental analysis can now detect it and invalidate it's cache to avoid false reports.

We have also improved logging on the analysis code, allowing better insight into how the cache is performing, under debug / verbose builds you can even see individual hits / misses to the cache (and the reason for any miss!)

Finally, as this feature keeps maturing, we are gently pushing this forward. If not using incremental analysis, a warning will now be produced suggesting users to adopt it for better performance.

Fixed Issues

  • all
    • #532: [core] security concerns on URL-based rulesets
    • #538: [core] Provide an XML Schema for XML reports
    • #600: [core] Nullpointer while creating cache File
    • #604: [core] Incremental analysis should detect changes to jars in classpath
    • #608: [core] Add DEBUG log when applying incremental analysis
    • #618: [core] Incremental Analysis doesn't close file correctly on Windows upon a cache hit
    • #643: [core] PMD Properties (dev-properties) breaks markup on CodeClimateRenderer
  • apex
    • #488: [apex] Use Apex lexer for CPD
    • #489: [apex] Update Apex compiler
    • #500: [apex] Running through CLI shows jorje optimization messages
  • cpp
    • #448: [cpp] Write custom CharStream to handle continuation characters
  • java
    • #1513: [java] Remove deprecated rule UseSingleton
    • #487: [java] Fix typeresolution for anonymous extending object
    • #496: [java] processing error on generics inherited from enclosing class
    • #527: [java] Lombok getter annotation on enum is not recognized correctly
  • java-basic
    • #565: [java] False negative on DontCallThreadRun when extending Thread
  • java-comments
    • #536: [java] CommentDefaultAccessModifierRule ignores constructors
  • java-controversial
    • #388: [java] controversial.AvoidLiteralsInIfCondition 0.0 false positive
    • #408: [java] DFA not analyzing asserts
    • #537: [java] UnnecessaryParentheses fails to detect obvious scenario
  • java-design
    • #357: [java] UncommentedEmptyConstructor consider annotations on Constructor
    • #438: [java] Relax AbstractClassWithoutAnyMethod when class is annotated by @AutoValue
    • #590: [java] False positive on MissingStaticMethodInNonInstantiatableClass
  • java-sunsecure
    • #468: [java] ArrayIsStoredDirectly false positive
  • java-unusedcode
    • #521: [java] UnusedPrivateMethod returns false positives with primitive data type in map argument
  • java-unnecessarycode
    • #412: [java] java-unnecessarycode/UnnecessaryFinalModifier missing cases

API Changes

  • The class net.sourceforge.pmd.lang.dfa.NodeType has been converted to an enum. All node types are enum members now instead of int constants. The names for node types are retained.

  • The properties API (rule and report properties) have been revamped to be fully typesafe. This is everything around net.sourceforge.pmd.PropertyDescriptor.

  • The rule classes net.sourceforge.pmd.lang.apex.rule.apexunit.ApexUnitTestClassShouldHaveAsserts and net.sourceforge.pmd.lang.apex.rule.apexunit.ApexUnitTestShouldNotUseSeeAllDataTrue have been renamed to ApexUnitTestClassShouldHaveAssertsRule and ApexUnitTestShouldNotUseSeeAllDataTrueRule, respectively. This is to comply with the naming convention, that each rule class should be suffixed with "Rule". This change has no impact on custom rulesets, since the rule names themselves didn't change.

  • The never implemented method PMD.processFiles(PMDConfiguration, RuleSetFactory, Collection<File>, RuleContext, ProgressMonitor) along with the interface ProgressMonitor has been removed.

  • The method PMD.setupReport(RuleSets, RuleContext, String) is gone. It was used to report dysfunctional rules. But PMD does this now automatically before processing the files, so there is no need for this method anymore.

  • All APIs deprecated in older versions are now removed. This includes:

    • Renderer.getPropertyDefinitions
    • AbstractRenderer.defineProperty(String, String)
    • AbstractRenderer.propertyDefinitions
    • ReportListener
    • Report.addListener(ReportListener)
    • SynchronizedReportListener
    • CPDConfiguration.CPDConfiguration(int, Language, String)
    • CPDConfiguration.getRendererFromString(String)
    • StreamUtil
    • StringUtil.appendXmlEscaped(StringBuilder, String)
    • StringUtil.htmlEncode(String)

  • Several methods in net.sourceforge.pmd.util.CollectionUtil have been deprecated and will be removed in PMD 7.0.0. In particular:

    • CollectionUtil.addWithoutDuplicates(T[], T)
    • CollectionUtil.addWithoutDuplicates(T[], T[])
    • CollectionUtil.areSemanticEquals(T[], T[])
    • CollectionUtil.areEqual(Object, Object)
    • CollectionUtil.arraysAreEqual(Object, Object)
    • CollectionUtil.valuesAreTransitivelyEqual(Object[], Object[])

  • Several methods in net.sourceforge.pmd.util.StringUtil have been deprecated and will be removed in PMD 7.0.0. In particular:

    • StringUtil.startsWithAny(String, String[])
    • StringUtil.isNotEmpty(String)
    • StringUtil.isEmpty(String)
    • StringUtil.isMissing(String)
    • StringUtil.areSemanticEquals(String, String)
    • StringUtil.replaceString(String, String, String)
    • StringUtil.replaceString(String, char, String)
    • StringUtil.substringsOf(String, char)
    • StringUtil.substringsOf(String, String)
    • StringUtil.asStringOn(StringBuffer, Iterator, String)
    • StringUtil.asStringOn(StringBuilder, Object[], String)
    • StringUtil.lpad(String, int)

  • The class net.sourceforge.pmd.lang.java.typeresolution.typedefinition.JavaTypeDefinition is now abstract, and has been enhanced to provide several new methods.

External Contributions