[JavaFlow] java.lang.VerifyException

[Stephan Coboos]

Hello,
I'am using JavaFlow. All my JavaFlows works very well, except one. If I 
use this Flow I got a empty page each first call. In the next call I got 
an exception which displays that the method of the flow can not be found 
but the name of the method is correct and it is correct registered:

org.apache.cocoon.ProcessingException: No method found for 
'editSingleContainer' at 
org.apache.cocoon.components.flow.java.JavaInterpreter.callFunction(JavaInterpreter.java:135) 
at 
org.apache.cocoon.components.treeprocessor.sitemap.CallFunctionNode.invoke(CallFunctionNode.java:130) 
at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:49) 
at 
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:130) 
at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72) 
at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:126) 
at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72) 
at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:101) 

The Tomcat logs shows me the following:
java.lang.VerifyError: (class: foo/bar/flow/EditSingleContainerFlow, 
method: doEditSingleContainer signature: ()V) Incompatible object 
argument for function call
   at java.lang.Class.getDeclaredMethods0(Native Method)
   at java.lang.Class.privateGetDeclaredMethods(Class.java:1647)
   at java.lang.Class.privateGetPublicMethods(Class.java:1770)
   at java.lang.Class.getMethods(Class.java:824)
   at 
org.apache.cocoon.components.flow.java.JavaInterpreter.initialize(JavaInterpreter.java:96)
   at 
org.apache.cocoon.components.flow.java.JavaInterpreter.callFunction(JavaInterpreter.java:130)
   at 
org.apache.cocoon.components.treeprocessor.sitemap.CallFunctionNode.invoke(CallFunctionNode.java:130)
   at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:49)
   at 
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:130)
   at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72)
   at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:126)
   at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72)
   at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:101)
   at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:336)
   at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:277)
   at 
org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:103)
   at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:49)
   at 
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:130)
   at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72)
   at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:126)
   at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:72)
   at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:101)
   at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:336)
   at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:277)
   at org.apache.cocoon.Cocoon.process(Cocoon.java:619)
   at 
org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:1073)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
   at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
   at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
   at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at 
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
   at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
   at 
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
   at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:793)
   at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:702)
   at 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:571)
   at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:644)
   at java.lang.Thread.run(Thread.java:534)

I had discovered that the loading of the JavaFlows stops on the class 
EditSingleContainerFlow. At the first call, which shows my an empty 
page, the logging stops at the following line without any exception:

registered java class "foo.bar.flow.EditSingleContainerFlow" for flow
(no more logs)
The class EditSingleContainerFlow is very big, so I will not post it 
here. If you need it, I will post it here. But one part of the class I 
will display here because it explains a strange behaviour. Normally I 
use the following lines of code:

// Works not:
   public void doEditSingleContainer() throws Exception {
       ...
       ContainerManager containerManager = null;
       SingleContainer singleContainer = null;   
        ...
       while(true) {

         ...
       }
    }
But these lines don't work.But if I move the containerManager and 
singleContainer outside from the method, it will work otherwise I will 
get the exception descriped before:

// Works:
       ...
       ContainerManager containerManager = null;
       SingleContainer singleContainer = null;
   public void doEditSingleContainer() throws Exception {
        ...
       while(true) {
         ...
       }
    }
Thank you for your help.
Regards
Stephan