[java] MissingOverrideRule exception when analyzing PMD under Java 9

Fixes #1074

Jaxen is now shaded into pmd-core, without org.w3c.dom.**

docs/pages/release_notes.md

@@ -43,6 +43,7 @@ This is a minor release.
 *   ecmascript
     *   [#861](https://github.com/pmd/pmd/issues/861): \[ecmascript] InnaccurateNumericLiteral false positive with hex literals
 *   java
+    *   [#1074](https://github.com/pmd/pmd/issues/1074): \[java] MissingOverrideRule exception when analyzing PMD under Java 9
     *   [#1174](https://github.com/pmd/pmd/issues/1174): \[java] CommentUtil.multiLinesIn() could lead to StringIndexOutOfBoundsException
 *   java-bestpractices
     *   [#651](https://github.com/pmd/pmd/issues/651): \[java] SwitchStmtsShouldHaveDefault should be aware of enum types

pmd-core/pom.xml

@@ -60,6 +60,34 @@
                     <suppressionsLocation>pmd-core-checkstyle-suppressions.xml</suppressionsLocation>
                 </configuration>
             </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <configuration>
+                    <artifactSet>
+                        <includes>jaxen:jaxen</includes>
+                    </artifactSet>
+                    <filters>
+                        <filter>
+                            <artifact>jaxen:jaxen</artifact>
+                            <includes>
+                                <include>org/jaxen/**</include>
+                            </includes>
+                            <excludes>
+                                <exclude>org/w3c/dom/**</exclude>
+                            </excludes>
+                        </filter>
+                    </filters>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
     <dependencies>

pmd-java/pom.xml

@@ -107,10 +107,6 @@
         </plugins>
     </build>
     <dependencies>
-        <dependency>
-            <groupId>jaxen</groupId>
-            <artifactId>jaxen</artifactId>
-        </dependency>
         <dependency>
             <groupId>net.java.dev.javacc</groupId>
             <artifactId>javacc</artifactId>

pmd-java8/pom.xml

@@ -54,10 +54,6 @@
             <version>${project.version}</version>
         </dependency>
 
-        <dependency>
-            <groupId>jaxen</groupId>
-            <artifactId>jaxen</artifactId>
-        </dependency>
         <dependency>
             <groupId>net.sourceforge.pmd</groupId>
             <artifactId>pmd-core</artifactId>

pmd-plsql/pom.xml

@@ -112,10 +112,6 @@
             <groupId>net.sourceforge.saxon</groupId>
             <artifactId>saxon</artifactId>
         </dependency>
-        <dependency>
-            <groupId>jaxen</groupId>
-            <artifactId>jaxen</artifactId>
-        </dependency>
 
         <dependency>
             <groupId>junit</groupId>

pmd-xml/pom.xml

@@ -65,10 +65,6 @@
         </plugins>
     </build>
     <dependencies>
-        <dependency>
-            <groupId>jaxen</groupId>
-            <artifactId>jaxen</artifactId>
-        </dependency>
         <dependency>
             <groupId>net.sourceforge.pmd</groupId>
             <artifactId>pmd-core</artifactId>