Loader constraint violation error

[limcheekin]

Hi,

I managed to port all examples from JUnit3 to JUnit4 style. But there are still 4 tests failed with error in Grails environment for the following two Test classes:
org.activiti.examples.bpmn.scripttask.ScriptTaskTest

loader constraint violation: when resolving overridden method "org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.getFactory()Ljavax/script/ScriptEngineFactory;" the class loader (instance of org/codehaus/groovy/grails/cli/support/GrailsRootLoader) of the current class, org/codehaus/groovy/jsr223/GroovyScriptEngineImpl, and its superclass loader (instance of <bootloader>), have different Class objects for the type javax/script/ScriptEngineFactory used in the signature

java.lang.LinkageError: loader constraint violation: when resolving overridden method "org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.getFactory()Ljavax/script/ScriptEngineFactory;" the class loader (instance of org/codehaus/groovy/grails/cli/support/GrailsRootLoader) of the current class, org/codehaus/groovy/jsr223/GroovyScriptEngineImpl, and its superclass loader (instance of ), have different Class objects for the type javax/script/ScriptEngineFactory used in the signature
at org.codehaus.groovy.jsr223.GroovyScriptEngineFactory.getScriptEngine(GroovyScriptEngineFactory.java:104)
at javax.script.ScriptEngineManager.getEngineByName(ScriptEngineManager.java:133)
at org.activiti.engine.impl.scripting.ScriptingEngines.evaluate(ScriptingEngines.java:60)
at org.activiti.engine.impl.bpmn.ScriptTaskActivity.execute(ScriptTaskActivity.java:45)
at org.activiti.pvm.impl.runtime.AtomicOperationActivityExecute.execute(AtomicOperationActivityExecute.java:40)
at org.activiti.pvm.impl.runtime.ExecutionImpl.performOperation(ExecutionImpl.java:523)
at org.activiti.pvm.impl.runtime.ExecutionImpl.start(ExecutionImpl.java:362)
at org.activiti.engine.impl.cmd.StartProcessInstanceCmd.execute(StartProcessInstanceCmd.java:64)
at org.activiti.engine.impl.cmd.StartProcessInstanceCmd.execute(StartProcessInstanceCmd.java:29)
at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:22)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:36)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
at org.activiti.engine.impl.RuntimeServiceImpl.startProcessInstanceByKey(RuntimeServiceImpl.java:46)
at org.activiti.examples.bpmn.scripttask.ScriptTaskTest.testScriptExecution(ScriptTaskTest.java:38)
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

org.activiti.examples.taskforms.TaskFormsTest

loader constraint violation: when resolving overridden method "org.activiti.engine.impl.scripting.JuelScriptEngine.getFactory()Ljavax/script/ScriptEngineFactory;" the class loader (instance of org/codehaus/groovy/grails/cli/support/GrailsRootLoader) of the current class, org/activiti/engine/impl/scripting/JuelScriptEngine, and its superclass loader (instance of <bootloader>), have different Class objects for the type javax/script/ScriptEngineFactory used in the signature

java.lang.LinkageError: loader constraint violation: when resolving overridden method "org.activiti.engine.impl.scripting.JuelScriptEngine.getFactory()Ljavax/script/ScriptEngineFactory;" the class loader (instance of org/codehaus/groovy/grails/cli/support/GrailsRootLoader) of the current class, org/activiti/engine/impl/scripting/JuelScriptEngine, and its superclass loader (instance of ), have different Class objects for the type javax/script/ScriptEngineFactory used in the signature
at org.activiti.engine.impl.scripting.JuelScriptEngineFactory.getScriptEngine(JuelScriptEngineFactory.java:129)
at javax.script.ScriptEngineManager.getEngineByName(ScriptEngineManager.java:133)
at org.activiti.engine.impl.scripting.ScriptingEngines.evaluate(ScriptingEngines.java:60)
at org.activiti.engine.impl.cmd.GetRenderedFormCmd.execute(GetRenderedFormCmd.java:92)
at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:22)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:36)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
at org.activiti.engine.impl.TaskServiceImpl.getRenderedStartFormByKey(TaskServiceImpl.java:115)
at org.activiti.examples.taskforms.TaskFormsTest.testTaskFormsWithVacationRequestProcess(TaskFormsTest.java:59)
‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Attached here source codes of activiti examples in JUnit4 style.
[attachment=0]activiti-examples-junit4.zip[/attachment]

Any idea how to fix the error? Please advice.

Regards,
Chee Kin

[frederikherema1]

Hi,

Can you try to run the tests without the livetribe-jsr223-2.0.6.jar on the classpath? This jar contains the javax.script classes, which are missing when running on Java 5 environment. I'm guessing that these classes are colliding with the ones on your JDK.

regards,
Frederik Heremans

[limcheekin]

Hi Frederik Heremans,

Yes, it works! All tests PASSED now. Is that means the library is needed in JDK5 environment only, but not JDK6 and onward?

Thank you very much!

Regards,
Chee Kin

[jbarrez]

@Chee: thats indeed the case. The livetribe jar is an implementation of the javax.script classes which are part of JDK6, but not of JDK5.

Congrats with the green tests 🙂

[frederikherema1]

Chee,

Apparently some classloaders are more forgiving than others when it comes to duplicate class entries

[limcheekin]

Hi,

Yeah! Thanks for confirmation.

Regards,
Chee Kin