Exception when performing a JDO - Query

Hello,

i get the following Exception:

java.util.EmptyStackException

at java.util.Stack.peek(Stack.java:79)

at com.sap.jdo.sql.jdbc.SQLQueryTreeWalker$SQLQueryTreeVisitor.getLastVariableValue(SQLQueryTreeWalker.java:1330)

at com.sap.jdo.sql.jdbc.SQLQueryTreeWalker$SQLQueryTreeVisitor.leave(SQLQueryTreeWalker.java:470)

at com.sap.jdo.common.query.tree.VariableAccessExpr.leave(VariableAccessExpr.java:63)

at com.sap.jdo.query.TreeWalker.walk(TreeWalker.java:55)

at com.sap.jdo.query.TreeWalker.walk(TreeWalker.java:53)

at com.sap.jdo.query.TreeWalker.walk(TreeWalker.java:53)

at com.sap.jdo.query.TreeWalker.walk(TreeWalker.java:53)

at com.sap.jdo.sql.jdbc.SQLQueryTreeWalker.<init>(SQLQueryTreeWalker.java:129)

at com.sap.jdo.sql.jdbc.SQLQueryTreeWalker.<init>(SQLQueryTreeWalker.java:103)

at com.sap.jdo.sql.jdbc.request.factory.JDBCRequestFactory.getQueryRequestImpl(JDBCRequestFactory.java:1116)

at com.sap.jdo.sql.jdbc.request.factory.JDBCRequestCloneCache.getQueryRequest(JDBCRequestCloneCache.java:347)

at com.sap.jdo.sql.jdbc.request.factory.JDBCRequestCache.getQueryRequest(JDBCRequestCache.java:476)

at com.sap.jdo.sql.jdbc.JDBCStoreManager.newQueryResult(JDBCStoreManager.java:676)

at com.sap.jdo.StoreManagerAdapter.newQueryResult(StoreManagerAdapter.java:453)

at com.sap.jdo.common.query.QueryImpl.executeWithArray(QueryImpl.java:616)

at com.sap.jdo.common.query.QueryImpl.execute(QueryImpl.java:529)

at com.vw.tpb.tpb.session.TpbHeaderBean.findTPBsByLabel(TpbHeaderBean.java:169)

at com.vw.tpb.tpb.session.TpbHeaderObjectImpl0.findTPBsByLabel(TpbHeaderObjectImpl0.java:188)

at com.vw.tpb.tpb.session.TpbHeader_Stub.findTPBsByLabel(TpbHeader_Stub.java:151)

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.sap.engine.services.ejb.session.stateless_sp5.ObjectStubProxyImpl.invoke(ObjectStubProxyImpl.java:187)

at $Proxy64.findTPBsByLabel(Unknown Source)

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.sap.engine.services.webservices.runtime.EJBImplementationContainer.invokeMethod(EJBImplementationContainer.java:126)

at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:146)

at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:68)

at com.sap.engine.services.webservices.runtime.servlet.ServletDispatcherImpl.doPost(ServletDispatcherImpl.java:92)

at SoapServlet.doPost(SoapServlet.java:51)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:383)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:263)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:333)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:311)

at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:811)

at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:235)

at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)

at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:147)

at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)

at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)

at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)

at java.security.AccessController.doPrivileged(Native Method)

at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)

at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:144)

when performing a query using

pm = pmf.getPersistenceManager();

Extent tpbs = pm.getExtent( TPBImpl.class, true );

String filter = "labels.contains( label ) && label.language == langParam && label.text.startsWith( textParam )";

Query query = pm.newQuery( tpbs, filter );

query.declareImports( "import com.vw.tpb.refdata.model.impl.LabelImpl");

query.declareVariables( "LabelImpl label" );

query.declareParameters( "String langParam, String textParam" );

Collection found = (Collection)query.execute( language, text );

Iterator it = found.iterator();

while( it.hasNext() ) {

result.add( String.valueOf( it.next() ));

}

query.close( it );

The line points to the query.execute() method.

Saving the complete Object tree and loading it w/o any query clauses does not raise any problems.

Does someone have any idea on that ?

regards, Udo