r ana [http://community.jboss.org/people/amy3k] created the discussion "error on serialization object" To view the discussion, visit: http://community.jboss.org/message/540711#540711 -------------------------------------------------------------- hello, i new to jbpm and i have a little (but for me is big and urgent problem) i have 2 web service - one is for "core"(WScomponents) and the second one is for creating a JBPM workflow(WSprincipal) that manage an application in WS principal i appeal one method from WScomponents that return a list of a custom object named "folder" (=> List<folder>), this list i've tried to put this in a jbpm variable like this: <java g="270,290,92,52" method="getAllFolders" name="getAllFolders" *var="folders"*>       <arg><object expr="#{pathID}"/></arg>       <arg><object expr="#{username}"/></arg>       <transition g="-62,-35" name="to preluareVar" to="preluareVar"/> </java> but in the method getAllFolders i've get an error like this: *org.jbpm.pvm.internal.wire.WireException: couldn't invoke method getAllFolders: couldn't serialize '[wscomponents.Folder@129e910]'*         at org.jbpm.jpdl.internal.activity.JavaActivity.perform(JavaActivity.java:97)         at org.jbpm.jpdl.internal.activity.JpdlAutomaticActivity.execute(JpdlAutomaticActivity.java:15)         at org.jbpm.pvm.internal.model.op.ExecuteActivity.perform(ExecuteActivity.java:60)         at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:637)         at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:597)         at org.jbpm.pvm.internal.model.ExecutionImpl.start(ExecutionImpl.java:201)         at org.jbpm.pvm.internal.cmd.StartProcessInstanceInLatestCmd.execute(StartProcessInstanceInLatestCmd.java:65)         at org.jbpm.pvm.internal.cmd.StartProcessInstanceInLatestCmd.execute(StartProcessInstanceInLatestCmd.java:38)         at org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42)         at org.jbpm.pvm.internal.tx.StandardTransactionInterceptor.execute(StandardTransactionInterceptor.java:54)         at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:46)         at org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:55)         at org.jbpm.pvm.internal.svc.ExecutionServiceImpl.startProcessInstanceByKey(ExecutionServiceImpl.java:78)         at workflow.PrincipalProcess.start(PrincipalProcess.java:57)         at workflow.principalWS.launch(principalWS.java:22)  .....and more any help/suggestion is appreciated!! 10x, a. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/540711#540711] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]