Description of problem:

When a JSON request is send to the server and this JSON is invalid, the server responds with NullPointerException (see the stack trace at the end of this message). The server should return a HTTP 400 and a more suitable message in the ServiceResponse object.

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

How reproducible:
Always

Steps to Reproduce:
1. Publish some container using the Decision Server
2. Send an invalid JSON command to the container instance endpoint, for example, an empty object:

{}

3.

Actual results:

Response:

{
  "type" : "FAILURE",
  "msg" : "Error calling container test: java.lang.NullPointerException: null",
  "result" : null
}


Expected results:

A better message saying that the JSON is invalid.

Additional info:


This is a follow up of BZ 1293736 where wrongly the problem was pointed as an issue with the Decision Server, but the problem was with a bad request generated by the deprecated Batch marshaller API (we used this API in 6.1)


Error calling container 'test': java.lang.NullPointerException
	at org.drools.core.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:135) [drools-core-6.3.0.Final-redhat-5.jar:6.3.0.Final-redhat-5]
	at org.drools.core.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:51) [drools-core-6.3.0.Final-redhat-5.jar:6.3.0.Final-redhat-5]
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.execute(StatefulKnowledgeSessionImpl.java:738) [drools-core-6.3.0.Final-redhat-5.jar:6.3.0.Final-redhat-5]
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.execute(StatefulKnowledgeSessionImpl.java:712) [drools-core-6.3.0.Final-redhat-5.jar:6.3.0.Final-redhat-5]
	at org.kie.server.services.impl.KieContainerCommandServiceImpl.callContainer(KieContainerCommandServiceImpl.java:103) [kie-server-services-common-6.3.0.Final-redhat-5.jar:6.3.0.Final-redhat-5]
	at org.kie.server.remote.rest.drools.CommandResource.manageContainer(CommandResource.java:73) [kie-server-rest-drools-6.3.0.Final-redhat-5.jar:6.3.0.Final-redhat-5]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_60]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.7.0_60]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_60]
	at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_60]
	at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:168) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:269) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:227) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:216) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:561) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:543) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:128) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
	at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.2.Final-redhat-2.jar:1.0.2.Final-redhat-2]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:231) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:512) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
	at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.5.4.Final-redhat-4.jar:7.5.4.Final-redhat-4]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:150) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
	at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:400) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:854) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
	at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_60]