[DROOLS-437] ClassCastException is thrown while sending SOAP message to the Drools Camel Server application's webservice endpoint

Description of problem:

• This is issue is mirrored from the following Community JIRA [1] as it is faced while using BRMS 6.0.1 product libraries too.

[1] https://issues.jboss.org/browse/DROOLS-437

Version-Release number of selected component (if applicable):

• BRMS 6.0.1

How reproducible:

• While trying out the drools-camel-server-example shared in the Community Github project branch [1] and sending a SOAP message to the webservice endpoint the "java.lang.ClassCastException: org.apache.cxf.binding.soap.SoapMessage cannot be cast to java.lang.String" exception takes place . This issue is reproducible in BRMS 6.0.1 too with the help of productised jars from the same release.

[1] https://github.com/droolsjbpm/droolsjbpm-integration/tree/6.0.x/drools-camel-server-example

Steps to Reproduce:
1. Firstly build the project after downloading it from here [1] and deploy it in BRMS 6.0.1 installation.
2. Then send similar SOAP request messages like these to the webservice endpoint [2]
~~~
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"; xmlns:soap="http://soap.jax.drools.org/">;
<soapenv:Header/>
<soapenv:Body>
<soap:execute>
<!-Optional:->
<soap:arg0>hello</soap:arg0>
</soap:execute>
</soapenv:Body>
</soapenv:Envelope>
~~~
3. Following SOAP fault is received
~~~
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">;
<soap:Body>
<soap:Fault>
<faultcode>soap:Server</faultcode>
<faultstring>org.apache.cxf.binding.soap.SoapMessage cannot be cast to java.lang.String</faultstring>
</soap:Fault>
</soap:Body>
</soap:Envelope>
~~~

[1] https://github.com/droolsjbpm/droolsjbpm-integration/tree/6.0.x/drools-camel-server-example
[2] http://localhost:8080/drools-camel-server-example-6.0.3-SNAPSHOT/kservice/soap

Actual results:

• The following exception gets thrown.
  ~~~
  18:17:41,606 ERROR [org.apache.camel.processor.DefaultErrorHandler] (http-/localhost:8080-2) Failed delivery for (MessageId: ID-vm22-gsslab-pnq-redhat-com-56326-1399546611115-0-7 on ExchangeId: ID-vm22-gsslab-pnq-redhat-com-56326-1399546611115-0-8). Exhausted after delivery attempt: 1 caught: java.lang.ClassCastException: org.apache.cxf.binding.soap.SoapMessage cannot be cast to java.lang.String: java.lang.ClassCastException: org.apache.cxf.binding.soap.SoapMessage cannot be cast to java.lang.String
  at org.kie.jax.soap.PreCxfTransportSoapProcessor.process(PreCxfTransportSoapProcessor.java:36) [kie-camel-6.0.3-SNAPSHOT.jar:6.0.3-SNAPSHOT]
  at org.kie.camel.component.KiePolicy$KieProcess.process(KiePolicy.java:323) [kie-camel-6.0.3-SNAPSHOT.jar:6.0.3-SNAPSHOT]
  at org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61) [camel-core-2.10.3.jar:2.10.3]
  ...
  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:86) [camel-core-2.10.3.jar:2.10.3]
  at org.apache.camel.component.cxf.CxfConsumer$1.syncInvoke(CxfConsumer.java:125) [camel-cxf-2.10.3.jar:2.10.3]
  at org.apache.camel.component.cxf.CxfConsumer$1.invoke(CxfConsumer.java:75) [camel-cxf-2.10.3.jar:2.10.3]
  at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:58) [cxf-bundle-jaxrs-2.6.8.jar:2.6.8]
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [rt.jar:1.7.0_51]
  at java.util.concurrent.FutureTask.run(FutureTask.java:262) [rt.jar:1.7.0_51]
  at org.apache.cxf.workqueue.SynchronousExecutor.execute(SynchronousExecutor.java:37) [cxf-bundle-jaxrs-2.6.8.jar:2.6.8]
  ...

18:17:41,610 WARNING [org.apache.cxf.phase.PhaseInterceptorChain] (http-/localhost:8080-2) Application

CommandExecutor has thrown exception, unwinding now: org.apache.cxf.interceptor.Fault: org.apache.cxf.binding.soap.SoapMessage cannot be cast to java.lang.String
at org.apache.camel.component.cxf.CxfConsumer$1.checkFailure(CxfConsumer.java:200) [camel-cxf-2.10.3.jar:2.10.3]
at org.apache.camel.component.cxf.CxfConsumer$1.setResponseBack(CxfConsumer.java:178) [camel-cxf-2.10.3.jar:2.10.3]
at org.apache.camel.component.cxf.CxfConsumer$1.syncInvoke(CxfConsumer.java:130) [camel-cxf-2.10.3.jar:2.10.3]
at org.apache.camel.component.cxf.CxfConsumer$1.invoke(CxfConsumer.java:75) [camel-cxf-2.10.3.jar:2.10.3]
at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:58) [cxf-bundle-jaxrs-2.6.8.jar:2.6.8]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [rt.jar:1.7.0_51]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [rt.jar:1.7.0_51]
at org.apache.cxf.workqueue.SynchronousExecutor.execute(SynchronousExecutor.java:37) [cxf-bundle-jaxrs-2.6.8.jar:2.6.8]
...
Caused by: java.lang.ClassCastException: org.apache.cxf.binding.soap.SoapMessage cannot be cast to java.lang.String
at org.kie.jax.soap.PreCxfTransportSoapProcessor.process(PreCxfTransportSoapProcessor.java:36) [kie-camel-6.0.3-SNAPSHOT.jar:6.0.3-SNAPSHOT]
at org.kie.camel.component.KiePolicy$KieProcess.process(KiePolicy.java:323) [kie-camel-6.0.3-SNAPSHOT.jar:6.0.3-SNAPSHOT]
at org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61) [camel-core-2.10.3.jar:2.10.3]
at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) [camel-core-2.10.3.jar:2.10.3]
...
~~~

Expected results:

• Would have successfully received a SOAP response.

Additional info: