OK, I'm using maven 1.0-rc2-SNAPSHOT with a project whose maven.xml contains:

<goal name="xdoc:generate-from-pom" prereqs="xdoc:init, xdoc:register-reports" ...

In other words, it's overriding one of the steps of the site goal. But boy is it unhappy! I've pulled out my hair with a large number of combinations of things but everything leads to the same error:

BUILD FAILED
File...... file:/c:/dev/edm-commons/maven.xml
Element... velocity:merge
Line...... 39
Column.... 4
loader constraints violated when linking org/apache/velocity/context/Context class


Basically, as soon as I try to call on Velocity, I get some Velocity Context class from some classloader that makes Java unhappy.

Does anyone know what's going on ... and better yet ... how to make it work?

For the anal retentive, here's the stack trace:

com.werken.werkz.UnattainableGoalException: Unable to obtain goal [site] -- file:/c:/dev/edm-commons/maven.xml:32:68: <velocity:merge> loader constraints violated when linking org/apache/velocity/context/Context class
at com.werken.werkz.Goal.fire(Goal.java:646)
at com.werken.werkz.Goal.attain(Goal.java:575)
at com.werken.werkz.WerkzProject.attainGoal(WerkzProject.java:193)
at org.apache.maven.plugin.PluginManager.attainGoals(PluginManager.java:572)
at org.apache.maven.MavenSession.attainGoals(MavenSession.java:304)
at org.apache.maven.cli.App.doMain(App.java:505)
at org.apache.maven.cli.App.main(App.java:1156)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.werken.forehead.Forehead.run(Forehead.java:551)
at com.werken.forehead.Forehead.main(Forehead.java:581)
org.apache.commons.jelly.JellyTagException: file:/c:/dev/edm-commons/maven.xml:32:68: <velocity:merge> loader constraints violated when linking org/apache/velocity/context/Context class
at org.apache.commons.jelly.impl.TagScript.handleException(TagScript.java:702)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:296)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:233)
at org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:145)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
at org.apache.maven.jelly.tags.werkz.MavenGoalTag.runBodyTag(MavenGoalTag.java:117)
at org.apache.maven.jelly.tags.werkz.MavenGoalTag$MavenGoalAction.performAction(MavenGoalTag.java:143)
at com.werken.werkz.Goal.fire(Goal.java:639)
at com.werken.werkz.Goal.attain(Goal.java:575)
at com.werken.werkz.Goal.attainPrecursors(Goal.java:488)
at com.werken.werkz.Goal.attain(Goal.java:573)
at com.werken.werkz.WerkzProject.attainGoal(WerkzProject.java:193)
at org.apache.maven.jelly.tags.werkz.MavenAttainGoalTag.doTag(MavenAttainGoalTag.java:165)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
at org.apache.maven.jelly.tags.werkz.MavenGoalTag.runBodyTag(MavenGoalTag.java:117)
at org.apache.maven.jelly.tags.werkz.MavenGoalTag$MavenGoalAction.performAction(MavenGoalTag.java:143)
at com.werken.werkz.Goal.fire(Goal.java:639)
at com.werken.werkz.Goal.attain(Goal.java:575)
at com.werken.werkz.WerkzProject.attainGoal(WerkzProject.java:193)
at org.apache.maven.plugin.PluginManager.attainGoals(PluginManager.java:572)
at org.apache.maven.MavenSession.attainGoals(MavenSession.java:304)
at org.apache.maven.cli.App.doMain(App.java:505)
at org.apache.maven.cli.App.main(App.java:1156)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.werken.forehead.Forehead.run(Forehead.java:551)
at com.werken.forehead.Forehead.main(Forehead.java:581)
Caused by: java.lang.LinkageError: loader constraints violated when linking org/apache/velocity/context/Context class
at org.apache.commons.jelly.tags.velocity.MergeTag.mergeTemplate(MergeTag.java:226)
at org.apache.commons.jelly.tags.velocity.MergeTag.doTag(MergeTag.java:108)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
... 30 more
Root cause
java.lang.LinkageError: loader constraints violated when linking org/apache/velocity/context/Context class
at org.apache.commons.jelly.tags.velocity.MergeTag.mergeTemplate(MergeTag.java:226)
at org.apache.commons.jelly.tags.velocity.MergeTag.doTag(MergeTag.java:108)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:233)
at org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:145)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
at org.apache.maven.jelly.tags.werkz.MavenGoalTag.runBodyTag(MavenGoalTag.java:117)
at org.apache.maven.jelly.tags.werkz.MavenGoalTag$MavenGoalAction.performAction(MavenGoalTag.java:143)
at com.werken.werkz.Goal.fire(Goal.java:639)
at com.werken.werkz.Goal.attain(Goal.java:575)
at com.werken.werkz.Goal.attainPrecursors(Goal.java:488)
at com.werken.werkz.Goal.attain(Goal.java:573)
at com.werken.werkz.WerkzProject.attainGoal(WerkzProject.java:193)
at org.apache.maven.jelly.tags.werkz.MavenAttainGoalTag.doTag(MavenAttainGoalTag.java:165)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
at org.apache.maven.jelly.tags.werkz.MavenGoalTag.runBodyTag(MavenGoalTag.java:117)
at org.apache.maven.jelly.tags.werkz.MavenGoalTag$MavenGoalAction.performAction(MavenGoalTag.java:143)
at com.werken.werkz.Goal.fire(Goal.java:639)
at com.werken.werkz.Goal.attain(Goal.java:575)
at com.werken.werkz.WerkzProject.attainGoal(WerkzProject.java:193)
at org.apache.maven.plugin.PluginManager.attainGoals(PluginManager.java:572)
at org.apache.maven.MavenSession.attainGoals(MavenSession.java:304)
at org.apache.maven.cli.App.doMain(App.java:505)
at org.apache.maven.cli.App.main(App.java:1156)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.werken.forehead.Forehead.run(Forehead.java:551)
at com.werken.forehead.Forehead.main(Forehead.java:581)
Root cause
java.lang.LinkageError: loader constraints violated when linking org/apache/velocity/context/Context class
at org.apache.commons.jelly.tags.velocity.MergeTag.mergeTemplate(MergeTag.java:226)
at org.apache.commons.jelly.tags.velocity.MergeTag.doTag(MergeTag.java:108)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:233)
at org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:145)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
at org.apache.maven.jelly.tags.werkz.MavenGoalTag.runBodyTag(MavenGoalTag.java:117)
at org.apache.maven.jelly.tags.werkz.MavenGoalTag$MavenGoalAction.performAction(MavenGoalTag.java:143)
at com.werken.werkz.Goal.fire(Goal.java:639)
at com.werken.werkz.Goal.attain(Goal.java:575)
at com.werken.werkz.Goal.attainPrecursors(Goal.java:488)
at com.werken.werkz.Goal.attain(Goal.java:573)
at com.werken.werkz.WerkzProject.attainGoal(WerkzProject.java:193)
at org.apache.maven.jelly.tags.werkz.MavenAttainGoalTag.doTag(MavenAttainGoalTag.java:165)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
at org.apache.maven.jelly.tags.werkz.MavenGoalTag.runBodyTag(MavenGoalTag.java:117)
at org.apache.maven.jelly.tags.werkz.MavenGoalTag$MavenGoalAction.performAction(MavenGoalTag.java:143)
at com.werken.werkz.Goal.fire(Goal.java:639)
at com.werken.werkz.Goal.attain(Goal.java:575)
at com.werken.werkz.WerkzProject.attainGoal(WerkzProject.java:193)
at org.apache.maven.plugin.PluginManager.attainGoals(PluginManager.java:572)
at org.apache.maven.MavenSession.attainGoals(MavenSession.java:304)
at org.apache.maven.cli.App.doMain(App.java:505)
at org.apache.maven.cli.App.main(App.java:1156)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.werken.forehead.Forehead.run(Forehead.java:551)
at com.werken.forehead.Forehead.main(Forehead.java:581)


--
Sean Kelly
Independent Consultant
http://seankelly.biz/



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