Hello,
I have a problem using Objects in JavaFlow before a while loop. Please see my first posting [JavaFlow] java.lang.VerifyException. In my opinion it can be a bug in the JavaFlow block.
Because my fist posting was not so clear, I had tried to reproduce the error for a while and I had discovered the following code which creates such an error (you need the packages of Lucene):
package foo.bar;
import org.apache.cocoon.components.flow.java.AbstractContinuable; import org.apache.lucene.queryParser.*; import org.apache.lucene.search.*; import org.apache.lucene.analysis.standard.StandardAnalyzer;
public class TestFlow extends AbstractContinuable {public void doTest() throws Exception {
// This causes an error -> The class can not be registered at first call!!!
Query query = null;
Hits hits;
IndexSearcher searcher = null;
// end
while(true) {
this.sendPageAndWait("foo");
query = QueryParser.parse("foo", "bar", new StandardAnalyzer());
hits = searcher.search(query);
}
}
}
If you test this error you can see that the first call of any (!) url of the corresponding cocoon app causes in a empty page. The flow-log shows as last entry the following line:
registered java class "foo.bar.TestFlow" for flow
Then, Cocoon stops working and displays a empty page.
In the logs of my servlet container Tomcat I can see the follwing error message:
2004-06-01 19:58:33 StandardWrapperValve[Cocoon]: Servlet.service() for servlet Cocoon threw exception
java.lang.VerifyError: (class: foo/bar/TestFlow, method: doTest 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.handleCocoonRedirect(TreeProcessor.java:382)
at org.apache.cocoon.components.treeprocessor.TreeProcessor.access$000(TreeProcessor.java:66)
at org.apache.cocoon.components.treeprocessor.TreeProcessor$TreeProcessorRedirector.cocoonRedirect(TreeProcessor.java:543)
at org.apache.cocoon.environment.ForwardRedirector.redirect(ForwardRedirector.java:58)
at org.apache.cocoon.components.treeprocessor.sitemap.RedirectToURINode.invoke(RedirectToURINode.java:69)
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)
If I change the code of the JavaFlow class and declare the variables "query", "hits" and "searcher" outside the method "doTest", no error will occur. See as follow:
package foo.bar;
import org.apache.cocoon.components.flow.java.AbstractContinuable; import org.apache.lucene.queryParser.*; import org.apache.lucene.search.*; import org.apache.lucene.analysis.standard.StandardAnalyzer;
public class TestFlow extends AbstractContinuable { // This works because it is ouside of doTest()
Query query = null;
Hits hits;
IndexSearcher searcher = null;
// end public void doTest() throws Exception {while(true) {
this.sendPageAndWait("foo");
query = QueryParser.parse("foo", "bar", new StandardAnalyzer());
hits = searcher.search(query);
}
}
}
Is it really a bug? Why is it not possible to declare these three line within the method doTest? What can I do?
Thank you.
Regards Stephan
