Hi Meghana,

I have not tried using BPEL for some time now, but I had this very issue before and it is because of an incompatibility in the xml parsing libraries of the jdk 1.5.0_05. I know that there is a workaround by moving around some of these xml parsing libraries, but I am not exactly sure what has to be done.
I know Alex is on holiday, but once he gets back he will certainly be able to give some more detail.

Regards,
Koen

I have similar problems with the following environment:

1. jBoss BPEL 1.1 Beta2
2. jBoss AS 4.0.5GA
3. jwsdp-2.0
4. jdk 1.5.0_08
5. ANT 1.6.5

I've tried to call the hello-bpel-process with the following code:

public void test()
{
 try {
 Properties properties = new Properties();
 properties.setProperty("java.naming.provider.url", "jnp://localhost:1099");
 properties.setProperty("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
 properties.setProperty("java.naming.factory.url.pkgs", "org.jboss.naming.client");
 properties.setProperty("j2ee.clientName", "jbpmbpel-client");
 Service service = null;
 if (service == null) {
 InitialContext iniCtx = new InitialContext(properties);
 Object object = iniCtx.lookup("java:comp/env/service/Hello");
 service = (Service)object;
 String portTypeNS = "http://jbpm.org/examples/hello";
 Call call = service.createCall(new QName(portTypeNS, "GreeterPort"),"sayHello");
 String greeting = (String) call.invoke(new Object[] { "Olive" });
 System.out.println("Greeting: "+greeting);
 }
 } catch (Exception e) {
 e.printStackTrace();
}

javax.naming.NamingException: Cannot unmarshall service ref meta data, cause: java.io.InvalidClassException: javax.xml.namespace.QName; local class incompatible: stream classdesc serialVersionUID = 4418622981026545151, local class serialVersionUID = -9120448754896609940
 at org.jboss.ws.jaxrpc.ServiceObjectFactory.getObjectInstance(ServiceObjectFactory.java:127)
 at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304)
 at org.jnp.interfaces.NamingContext.getObjectInstance(NamingContext.java:1125)
 at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1142)
 at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:705)
 at org.jboss.naming.client.java.javaURLContextFactory$EncContextProxy.invoke(javaURLContextFactory.java:135)
 at $Proxy0.lookup(Unknown Source)
 at javax.naming.InitialContext.lookup(InitialContext.java:351)
 at frank.DII.test(DII.java:51)

Object object = iniCtx.lookup("java:comp/env/service/Hello");

public void dii()
{
 try {
 String endpoint = "http://localhost:8080/hello/greeter?wsdl&resource=hello.wsdl";
 QName qName = new QName(endpoint);
 ServiceFactory serviceFactory = ServiceFactory.newInstance();
 Service service = serviceFactory.createService(qName);

 Call call = service.createCall();
 call.setOperationName(new QName(endpoint,"sayHello"));
 call.setTargetEndpointAddress(endpoint);

 call.setProperty(Call.ENCODINGSTYLE_URI_PROPERTY,"http://schemas.xmlsoap.org/soap/encoding/");
 call.setProperty(Call.OPERATION_STYLE_PROPERTY, "rpc");

 Object[] arguments = new Object[] {"wo"};
 Object result = call.invoke(arguments);
 System.out.println(""+result);
 } catch (Exception e) {
 e.printStackTrace();
 }
}

15:02:26,791 INFO [Server] JBoss (MX MicroKernel) [4.0.5.GA (build: CVSTag=Branch_4_0 date=200610162339)] Started in 1m:48s:151ms
15:02:59,288 WARN [HandlerWrapper] RuntimeException in handler method, transition to DOES_NOT_EXIST
15:02:59,288 ERROR [HandlerChainBaseImpl] RuntimeException in request handler
java.lang.NullPointerException
 at org.jbpm.bpel.integration.server.SoapHandler.getRequestParts(SoapHandler.java:355)
 at org.jbpm.bpel.integration.server.SoapHandler.sendRequest(SoapHandler.java:299)
 at org.jbpm.bpel.integration.server.SoapHandler.handleRequest(SoapHandler.java:186)
 at org.jboss.ws.handler.HandlerWrapper.handleRequest(HandlerWrapper.java:121)
 ...
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
 at java.lang.Thread.run(Thread.java:595)
15:02:59,294 ERROR [SOAPFaultExceptionHelper] SOAP request exception
java.lang.NullPointerException
 at org.jbpm.bpel.integration.server.SoapHandler.getRequestParts(SoapHandler.java:355)
 at org.jbpm.bpel.integration.server.SoapHandler.sendRequest(SoapHandler.java:299)
....
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
 at java.lang.Thread.run(Thread.java:595)
15:02:59,305 WARN [HandlerWrapper] Handler is in state DOES_NOT_EXIST, skipping Handler.handleFault for: org.jbpm.bpel.integration.server.SoapHandler@1c60f74

I 've found the following entry in the jndi:

Global JNDI Namespace

+- jbpmbpel-client (class: org.jnp.interfaces.NamingContext)
| +- service (class: org.jnp.interfaces.NamingContext)
| | +- Hello (class: org.jboss.ws.jaxrpc.ServiceReferenceable)

Properties properties = new Properties();
properties.setProperty("java.naming.provider.url", "jnp://localhost:1099");
properties.setProperty("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
properties.setProperty("java.naming.factory.url.pkgs", "org.jboss.naming.client");
properties.setProperty("j2ee.clientName", "jbpmbpel-client");
InitialContext iniCtx = new InitialContext(properties);

NamingEnumeration iter = (NamingEnumeration)iniCtx.list("jbpmbpel-client/service");
while (iter.hasMore())
{
 System.out.println(" "+iter.next());
}

Hello: org.jboss.ws.jaxrpc.ServiceReferenceable

Properties properties = new Properties();
properties.setProperty("java.naming.provider.url", "jnp://localhost:1099");
properties.setProperty("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
properties.setProperty("java.naming.factory.url.pkgs", "org.jboss.naming.client");
properties.setProperty("j2ee.clientName", "jbpmbpel-client");
InitialContext iniCtx = new InitialContext(properties);

Object object = iniCtx.lookup("jbpmbpel-client/service/Hello");

19:56:02,788 ERROR ServiceObjectFactory : Cannot create service
javax.naming.NamingException: Cannot unmarshall service ref meta data, cause: java.io.InvalidClassException: javax.xml.namespace.QName; local class incompatible: stream classdesc serialVersionUID = 4418622981026545151, local class serialVersionUID = -9120448754896609940
 at org.jboss.ws.jaxrpc.ServiceObjectFactory.getObjectInstance(ServiceObjectFactory.java:127)
 at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304)
 at org.jnp.interfaces.NamingContext.getObjectInstance(NamingContext.java:1125)
 at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1142)
 at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:705)
 at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:587)
 at javax.naming.InitialContext.lookup(InitialContext.java:351)

As mentioned above I get a NullPointer Exception on line 355 in the method getRequestParts in the class SoapHandler:

private static Map getRequestParts(SOAPElement operationWrapper,
 javax.wsdl.Message requestMessage) throws JMSException, SOAPException {
 HashMap inputParts = new HashMap();
 Name nilName = SOAPFactory.newInstance().createName(BpelConstants.ATTR_NIL,
 null, BpelConstants.NS_XML_SCHEMA_INSTANCE);

 // iterate through input message parts
 Iterator partIt = requestMessage.getParts().values().iterator();
 while (partIt.hasNext()) {
 Part requestPart = (Part) partIt.next();
 // get part accessor from operation wrapper
 String partName = requestPart.getName();
 SOAPElement partAccessor = XmlUtil.getElement(operationWrapper, partName);

 // BPEL-68 check for xsi:nil
 String nilValue = partAccessor.getAttributeValue(nilName); // line 355
 if (nilValue == null
 || DatatypeUtil.parseBoolean(nilValue) != Boolean.TRUE) {
 SOAPElement partValue = getPartValue(partAccessor, requestPart);
 // create a dom element with the same name as the operation part
 Element inputPart = XmlUtil.createElement(partValue.getNamespaceURI(),
 partValue.getLocalName());
 // add part to input message
 inputParts.put(partName, inputPart);
 // copy operation part to input part
 XmlUtil.copy(inputPart, partValue);
 }
 // else: do not copy the operation part
 }
 return inputParts;
 }

XmlUtil.getElement(operationWrapper, partName);

SOAPElement partAccessor = XmlUtil.getElement(operationWrapper, partName);

String nilValue = partAccessor.getAttributeValue(nilName);

jBPM BPEL 1.1.Beta2 predates JBoss AS 4.0.5.GA, hence it is untested with that version. However, the InvalidClassException is not caused by a problem with jBPM BPEL but by a mismatch between the server and client classes.

As mentioned in section 4.4 of the user guide, the lib/endorsed subdirectory of JBoss AS contains replacements for the default implementations of the XML APIs in the JDK. Overriding the default implementations should resolve the class mismatch.

The NullPointerException in the DII code is caused because a malformed SOAP envelope is being sent to the engine. I see several parameters that are not quite right - please compare your code with the DII code provided with the Hello example.

On the other hand, the server code should probably be more robust and inform that the SOAP envelope is malformed. Please create a JIRA issue for this.

Hi Alex,

thank you very much for your advice! I've found in one implementation of QName the following explanation:

* <p>Due to a historical defect, QName was released with multiple
 * serialVersionUID values even though its serialization was the
 * same.</p>
 *
 * <p>To workaround this issue, serialVersionUID is set with either
 * a default value or a compatibility value. To use the
 * compatiblity value, set the system property:</p>
 *
 * <code>com.sun.xml.namespace.QName.useCompatibleSerialVersionUID=1.0</code>
 *
 * <p>This workaround was inspired by classes in the javax.management
 * package, e.g. ObjectName, etc.
 * See CR6267224 for original defect report.</p>
 */
 private static final long serialVersionUID;
 /**
 * <p>Default <code>serialVersionUID</code> value.</p>
 */
 private static final long defaultSerialVersionUID = -9120448754896609940L;
 /**
 * <p>Compatibility <code>serialVersionUID</code> value.</p>
 */
 private static final long compatibleSerialVersionUID = 4418622981026545151L;
 /**
 * <p>Flag to use default or campatible serialVersionUID.</p>
 */
 private static boolean useDefaultSerialVersionUID = true;

public void test()
{
 try {
 Properties system = System.getProperties();
 system.put("com.sun.xml.namespace.QName.useCompatibleSerialVersionUID", "1.0");
 System.setProperties(system);

 Properties properties = new Properties();
 properties.setProperty("java.naming.provider.url","jnp://localhost:1099");
properties.setProperty("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
 properties.setProperty("java.naming.factory.url.pkgs","org.jboss.naming.client");
 properties.setProperty("j2ee.clientName", "jbpmbpel-client");
 Service service = null;
 if (service == null) {
 InitialContext iniCtx = new InitialContext(properties);
 Object object = iniCtx.lookup("java:comp/env/service/Hello");
 service = (Service)object;
 String portTypeNS = "http://jbpm.org/examples/hello";
 Call call = service.createCall(new QName(portTypeNS, "GreeterPort"),"sayHello");
 String greeting = (String) call.invoke(new Object[] { "Olive" });
 System.out.println("Greeting: "+greeting);
 }
 } catch (Exception e) {
 e.printStackTrace();
 }
}

....
<env:Envelope xmlns:env='http://schemas.xmlsoap.org/soap/envelope/'>
 <env:Header/>
 <env:Body>
 <ns1:sayHelloResponse xmlns:ns1='http://jbpm.org/examples/hello'>
 <greeting>Hello, Olive!</greeting>
 </ns1:sayHelloResponse>
 </env:Body>
</env:Envelope>
11:21:44,647 DEBUG SOAPBindingProvider : unbindResponseMessage: {http://jbpm.org/examples/hello}sayHello
11:21:44,653 DEBUG EndpointInvocation : setReturnValue: org.jboss.ws.soap.SOAPContentElement
11:21:44,653 DEBUG EndpointInvocation : getReturnValue
11:21:44,657 DEBUG SOAPContentElement : getObjectValue [xmlType={http://www.w3.org/2001/XMLSchema}string,javaType=class java.lang.String]
11:21:44,658 DEBUG SOAPContentElement : getXMLFragment from DOM
11:21:44,658 DEBUG SOAPContentElement : xmlFragment: <greeting>Hello, Olive!</greeting>
11:21:44,659 DEBUG SimpleDeserializer : deserialize: [xmlName=greeting,xmlType={http://www.w3.org/2001/XMLSchema}string]
11:21:44,662 DEBUG SOAPContentElement : objectValue: java.lang.String
11:21:44,662 DEBUG EndpointInvocation : transformPayloadValue: org.jboss.ws.soap.SOAPContentElement -> java.lang.String
11:21:44,663 DEBUG MessageContextAssociation : popMessageContext: org.jboss.ws.soap.SOAPMessageContextImpl@53ab04
Greeting: Hello, Olive!

With the following code I can access the hello-bpel-process:

public void dii()
{
 try {
 URL wsdlURL = new URL("http://localhost:8080/hello/greeter?wsdl");
 String targetNamespace = "http://jbpm.org/examples/hello";
 QName portName = new QName(targetNamespace,"GreeterPort");
 QName serviceName = new QName(targetNamespace, "HelloWorldService");
 QName operationName = new QName(targetNamespace, "sayHello");

 ServiceFactory serviceFactory = ServiceFactory.newInstance();
 Service service = serviceFactory.createService(wsdlURL, serviceName);
 Call call = (Call)service.createCall(portName);
 call.setOperationName(operationName);

 Object[] arguments = new Object[] {"Olive"};
 Object result = call.invoke(arguments);
 System.out.println(""+result);
 } catch (Exception e) {
 e.printStackTrace();
 }
}

Yep, you can avoid using the endorsed standards override mechanism by setting that property. This had actually been discussed in an earlier forum topic and published in our knowledge base.

However, this silly incompatibility introduced in JDK 1.5.0_07 would never have been an issue had we chosen overriding the default XML implementations as the preferred method to avoid this and similar issues. This is why I no longer suggest alternate methods.

Cheers,

Alejandro