Fernando Miguelez added a comment - 2016-04-15 11:25 - edited I downloaded the sources and tried to generate it locally. If found it is not possible to use a JDK6 to compile due to other plugin compatibility: [ERROR] Failed to execute goal org.jenkins-ci.tools:maven-hpi-plugin:1.117:validate (default-validate) on project throttle-concurrents: Execution default-validate of goal org.jenkins-ci.tools:maven-hpi-plugin:1.117:validate failed: Unable to load the mojo 'validate' in the plugin 'org.jenkins-ci.tools:maven-hpi-plugin:1.117' due to an API incompatibility: org.codehaus.plexus.component.repository.exception.ComponentLookupException: org/jenkinsci/maven/plugins/hpi/ValidateMojo : unsupported classversion 51.0 The problem lies in the pom.xml configuration. "compileSource" and "compileTarget" no longer work but "java.level" and "java.level.test". So pom.xml should be updated: {{<!-- <compileSource>1.6</compileSource> <compileTarget>1.6</compileTarget> --> <java.level>6</java.level> <java.level.test>6</java.level.test>}} There was another issue with xml-apis. It did not compile due to a missing class. I had to force a higher version: {{ <dependency> <groupId>xml-apis</groupId> <artifactId>xml-apis</artifactId> <version>1.4.01</version> <scope>test</scope> </dependency>}} And finally one of the classes would now compile due to Java7 syntax: [ERROR] /O:/oip/ws/oip/throttle-concurrent-builds-plugin-throttle-concurrents-1.9.0/src/test/java/hudson/plugins/throttleconcurrents/testutils/HtmlUnitHelper.java: [56,46] diamond operator is not supported in -source 1.6 Just replace following line (65) of HtmlUnitHelper.java : List<HtmlButton> res = new ArrayList<>(buttons.size()); by List<HtmlButton> res = new ArrayList<HtmlButton>(buttons.size()); And it works.

Oleg Nenashev added a comment - 2017-06-12 06:57 The plugin's dependency has been upgraded to 1.642.3. Now Java 7 is officially required there