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https://issues.apache.org/jira/browse/MPH-142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16405270#comment-16405270
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Karl Heinz Marbaise commented on MPH-142:
-----------------------------------------
This means simply you have not pinned your plugin version correctly but you
seemed to be using maven-help-plugin somehow ?
> mvn 3.0.5 starts using maven-help-plugin 3.0 resulting in java 6 problems
> -------------------------------------------------------------------------
>
> Key: MPH-142
> URL: https://issues.apache.org/jira/browse/MPH-142
> Project: Maven Help Plugin
> Issue Type: Bug
> Affects Versions: 3.0.0
> Environment: mvn -v
> Apache Maven 3.0.5 (r01de14724cdef164cd33c7c8c2fe155faf9602da; 2013-02-19
> 14:51:28+0100)
> Maven home: C:\devenv\java\apache-maven-3.0.5\bin\..
> Java version: 1.6.0_45, vendor: Sun Microsystems Inc.
> Reporter: Ivan Belis
> Priority: Major
>
> We are using maven 3.0.5 with a JDK 1.6.
> We did not change anything in our projects poms, but suddenly builds started
> failing (multiple builds).
> This version of maven started using the 3.0.0 version of the help-plugin,
> resulting in failing builds because the 3.0.0 does not support java 6.
>
> REMARK: this is not a problem of the maven-help-plugin but rather a problem
> with how maven determines the versions of plugins !
>
> This is the error we are getting:
> WARNING: Error injecting: org.apache.maven.plugins.help.ActiveProfilesMojo
> java.lang.TypeNotPresentException: Type
> org.apache.maven.plugins.help.ActiveProfilesMojo not present
> at
> org.sonatype.guice.bean.reflect.URLClassSpace.loadClass(URLClassSpace.java:109)
> at
> org.sonatype.guice.bean.reflect.NamedClass.load(NamedClass.java:45)
> Caused by: java.lang.UnsupportedClassVersionError:
> org/apache/maven/plugins/help/ActiveProfilesMojo : Unsupported major.minor
> version 51.0
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
> at
> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
>
> [ERROR] -----------------------------------------------------
> [ERROR] realm = plugin>org.apache.maven.plugins:maven-help-plugin:3.0.0
> [ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
> [ERROR] urls[0] =
> [file:/c:/devenv/java/.m2/repository/org/apache/maven/plugins/maven-help-plugin/3.0.0/maven-help-plugin-3.0.0.jar|file:///c:/devenv/java/.m2/repository/org/apache/maven/plugins/maven-help-plugin/3.0.0/maven-help-plugin-3.0.0.jar]
>
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