I am developing an application with Jonas and my environment is as follows:

-Jonas 4.0.0
-Tomcat 5.0.19 standalone (my web app uses the remote interfaces).
-I have amongst others those three jars in my web-inf/lib directory:
*test_guide.jar(my ejb jar)
*ejb-2_1-api.jar(from jonas)
*client.jar(from jonas)


I come across the following error:
[code]
javax.naming.CommunicationException [Root exception is java.rmi.UnmarshalException: error unmarshalling return; nested e
xception is:
        java.io.StreamCorruptedException]
        at com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:92)
        at com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:98)
        at javax.naming.InitialContext.lookup(InitialContext.java:347)
        at com.softwareag.test_guide.web.util.PGServiceLocator.getRemoteHome(PGServiceLocator.java:82)
        at com.softwareag.test_guide.web.temp.PGSearch.executeNewSearch(PGSearch.java:25)
        at com.softwareag.test_guide.web.temp.PGSearchManagedBean.newSearchAction(PGSearchManagedBean.java:29)
        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 net.sourceforge.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:113)
        at net.sourceforge.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:65)
        at javax.faces.component.UICommand.broadcast(UICommand.java:109)
        at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:84)
        at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:142)
        at net.sourceforge.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:254)
        at net.sourceforge.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:85)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:97)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
        at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732)
        at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688)
        at java.lang.Thread.run(Thread.java:534)
Caused by: java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
        java.io.StreamCorruptedException
        at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
        at com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:88)
        ... 41 more
Caused by: java.io.StreamCorruptedException
        at java.io.ObjectInputStream$BlockDataInputStream.readBlockHeader(ObjectInputStream.java:2347)
        at java.io.ObjectInputStream$BlockDataInputStream.refill(ObjectInputStream.java:2380)
        at java.io.ObjectInputStream$BlockDataInputStream.skipBlockData(ObjectInputStream.java:2285)
        at java.io.ObjectInputStream.skipCustomData(ObjectInputStream.java:1795)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1772)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
        ... 43 more
-----------------
com.softwareag.test_guide.web.util.PGServiceLocatorException
        at com.softwareag.test_guide.web.util.PGServiceLocator.getRemoteHome(PGServiceLocator.java:92)
        at com.softwareag.test_guide.web.temp.PGSearch.executeNewSearch(PGSearch.java:25)
        at com.softwareag.test_guide.web.temp.PGSearchManagedBean.newSearchAction(PGSearchManagedBean.java:29)
        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 net.sourceforge.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:113)
        at net.sourceforge.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:65)
        at javax.faces.component.UICommand.broadcast(UICommand.java:109)
        at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:84)
        at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:142)
        at net.sourceforge.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:254)
        at net.sourceforge.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:85)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:97)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
        at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732)
        at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688)
        at java.lang.Thread.run(Thread.java:534)
[/code]

[code]
package com.softwareag.test_guide.web.temp;

import java.rmi.RemoteException;
import java.util.List;

import com.softwareag.test_guide.TransferObjects.PGQueryTO;
import com.softwareag.test_guide.web.util.PGFactory;

/**
 * @author Julien Martin
 */

public class PGSearchManagedBean {

private String category;
private List postcodes;
private String name;
private boolean commentsExist;
private String sortOrderCriterion;
private int minimumNote;

/**
*
*/
public String newSearchAction() throws RemoteException { //TODO: Remove that
System.out.println("----------within new search action--------------");
PGQueryTO query = PGFactory.getQueryInstance(this);
PGSearch search = PGFactory.getSearchInstance();
String results = search.executeNewSearch(query);
return results;
}

/**
*
*/
public String nextAction() throws RemoteException { //TODO: Remove that
PGSearch search = PGFactory.getSearchInstance();
String issue = search.next();
return issue;
}

/**
*
*/
public String previousAction() throws RemoteException { //TODO: Remove that
PGSearch search = PGFactory.getSearchInstance();
String issue = search.previous();
return issue;
}

public String getCategory() {
return category;
}

public boolean getCommentsExist() {
return commentsExist;
}

public int getMinimumNote() {
return minimumNote;
}

public String getName() {
return name;
}

public List getPostcodes() {
return postcodes;
}

public String getSortOrderCriterion() {
return sortOrderCriterion;
}

public void setCategory(String string) {
category = string;
}

public void setCommentsExist(boolean bool) {
commentsExist = bool;
}

public void setMinimumNote(int i) {
minimumNote = i;
}

public void setName(String string) {
name = string;
}

public void setPostcodes(List list) {
postcodes = list;
}

public void setSortOrderCriterion(String string) {
sortOrderCriterion = string;
}

}

[/code]


[code]
package com.softwareag.test_guide.web.util;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import javax.ejb.EJBHome;
import javax.ejb.EJBLocalHome;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.rmi.PortableRemoteObject;

/**
 * @author Julien Martin
 */
public class PGServiceLocator {

private InitialContext initialContext;
private Map cache;
private Properties props;

private static PGServiceLocator _instance;

static {
try {
_instance = new PGServiceLocator();
} catch (PGServiceLocatorException se) {
System.err.println(se);
se.printStackTrace(System.err);
}
}

private PGServiceLocator() throws PGServiceLocatorException {
try {
props = new Properties();
props.put(Context.INITIAL_CONTEXT_FACTORY,PGConstants.INITIAL_CONTEXT_FACTORY);
props.put(Context.PROVIDER_URL,PGConstants.PROVIDER_URL);
props.put(Context.SECURITY_PRINCIPAL,PGConstants.SECURITY_PRINCIPAL);
props.put(Context.SECURITY_CREDENTIALS,PGConstants.SECURITY_CREDENTIALS);
initialContext = new InitialContext(props);
cache = Collections.synchronizedMap(new HashMap());
} catch (NamingException ne) {
//throw new PGServiceLocatorException(ne);
throw new PGServiceLocatorException();
} catch (Exception e) {
//throw new PGServiceLocatorException(e);
throw new PGServiceLocatorException();
}
}

static public PGServiceLocator getInstance() {
return _instance;
}

public EJBLocalHome getLocalHome(String jndiHomeName) throws PGServiceLocatorException {
EJBLocalHome localHome = null;
try {
if (cache.containsKey(jndiHomeName)) {
localHome = (EJBLocalHome) cache.get(jndiHomeName);
} else {
localHome = (EJBLocalHome) initialContext.lookup(jndiHomeName);
cache.put(jndiHomeName, localHome);
}
} catch (NamingException nex) {
//throw new PGServiceLocatorException(nex);
throw new PGServiceLocatorException();
} catch (Exception ex) {
//throw new PGServiceLocatorException(ex);
throw new PGServiceLocatorException();
}
return localHome;
}

public EJBHome getRemoteHome(String jndiHomeName, Class homeClassName) throws PGServiceLocatorException {
EJBHome remoteHome = null;
try {
if (cache.containsKey(jndiHomeName)) {
remoteHome = (EJBHome) cache.get(jndiHomeName);
} else {
Object objref = initialContext.lookup(jndiHomeName);
Object obj = PortableRemoteObject.narrow(objref, homeClassName);
remoteHome = (EJBHome) obj;
cache.put(jndiHomeName, remoteHome);
}
} catch (NamingException nex) {
//throw new PGServiceLocatorException(nex);
System.out.println("-----------------");
nex.printStackTrace();
System.out.println("-----------------");
throw new PGServiceLocatorException();
} catch (Exception ex) {
//throw new PGServiceLocatorException(ex);
throw new PGServiceLocatorException();
}
return remoteHome;
}

}

[/code]


[code]
package com.softwareag.test_guide.web.temp;

import java.rmi.RemoteException;
import java.util.List;

import javax.ejb.CreateException;

import com.softwareag.test_guide.TransferObjects.PGQueryTO;
import com.softwareag.test_guide.searchEngineEJB.PGSearchEngineListHandlerException;
import com.softwareag.test_guide.searchEngineEJB.PGSearchEngineValueListHandler;
import com.softwareag.test_guide.searchEngineEJB.PGSearchEngineValueListHandlerHome;
import com.softwareag.test_guide.web.util.PGServiceLocator;
import com.softwareag.test_guide.web.util.PGServiceLocatorException;
import com.softwareag.test_guide.web.util.PGSessionUtil;

/**
 * @author Julien Martin
 */
public class PGSearch {

public String executeNewSearch(PGQueryTO query) throws RemoteException { //TODO: remove that exception
try {
//We retrieve the local home object
//keep/PGSearchEngineValueListHandlerLocalHome pGSearchEngineHome = (PGSearchEngineValueListHandlerLocalHome) PGServiceLocator.getInstance().getLocalHome("PGSearchEngineValueListHandlerEJBHome_L");
PGSearchEngineValueListHandlerHome pGSearchEngineHome = (PGSearchEngineValueListHandlerHome) PGServiceLocator.getInstance().getRemoteHome("PGSearchEngineValueListHandlerEJBHome", PGSearchEngineValueListHandlerHome.class);
//We obtain a local interface object from the local home object
//keep/PGSearchEngineValueListHandlerLocal pGSearchEngine = pGSearchEngineHome.create();
PGSearchEngineValueListHandler pGSearchEngine = pGSearchEngineHome.create();
//We put the local interface into the session for later use
PGSessionUtil.putSearchEngineEJBIntoSession(pGSearchEngine);
//We execute the search
boolean containsResults = pGSearchEngine.executeSearch(query);
System.out.println("------containsResults------->" + containsResults);
//If the search does return results,
//1. We fetch the first n elements
//2. We put the results into the session
//3. We return the following String
if (containsResults) {
List firstResults = pGSearchEngine.getNextElements(0, 15);
PGSessionUtil.putResultsListIntoSession(firstResults);
return "displayResults";
}
//If the search does not return results, we return the following String
else {
return "noResults";
}

} catch (CreateException e) {
e.printStackTrace();
return null;
} catch (PGServiceLocatorException e) {
e.printStackTrace();
return null;
} catch (PGSearchEngineListHandlerException e) {
e.printStackTrace();
return null;

}
}

public String next() {
try {
//PGSearchEngineValueListHandlerLocal pGSearchEngine = PGSessionUtil.getSearchEngineEJBFromSession();
PGSearchEngineValueListHandler pGSearchEngine = PGSessionUtil.getSearchEngineEJBFromSession();
List list = pGSearchEngine.getNextElements(15, 20);
if (!list.isEmpty()) {
return "displayResults";
} else {
return "endOfResults";
}
} catch (RemoteException e) {
// TODO Remove that
e.printStackTrace();
return null;
}
}

public String previous() {
try {
//PGSearchEngineValueListHandlerLocal pGSearchEngine = PGSessionUtil.getSearchEngineEJBFromSession();
PGSearchEngineValueListHandler pGSearchEngine = PGSessionUtil.getSearchEngineEJBFromSession();
List list = pGSearchEngine.getPreviousElements(15, 20);
if (!list.isEmpty()) {
return "displayResults";
} else {
return "endOfResults";
}
} catch (RemoteException e) {
// TODO Remove that
e.printStackTrace();
return null;
}
}
}

[/code]


Can anybody help please?

Thanks in advance,

Julien Martin.

Some things that I have seen that cause these kinds of errors to be thrown:

1) Non-serializable objects. Are your Transfer Object's serializable? Or, do they contain references to non-Serializable objects?

2) Overloaded methods. Sometimes having two methods with the same name confuses the IIOP protocol.

3) Different class versions on client and server.