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Type: Bug
Resolution: Done
Priority: Major
Fix Version/s: None
Affects Version/s: 6.x.x
Component/s: Kie-Server
Labels:
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CDW release:
Target Release:

7.0.0.GA
Workaround:

Workaround Exists
Workaround Description:

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Use the taskClient.getTaskInstance method instead.

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Use the taskClient.getTaskInstance method instead.
Steps to Reproduce:
- Start a Kie server
- Use the kie server java client API to try to search a task that does not exist by id using the `taskClient.findTaskById` method

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When using the KieServer Java client and trying to search a task by ID using the method findTaskById from UserTaskServicesClient, we have a NPE in server side, resulting in an unexpected exception on client side. It should throw a 404 instead.

sample code

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configuration = KieServicesFactory.newRestConfiguration(URL, USR, PSW);
// we can choose between XSTREAM, JSON and JAXB - default is JAXB
configuration.setMarshallingFormat(MarshallingFormat.JAXB);
// the time that the client can wait for a server response
configuration.setTimeout(5000);
client = KieServicesFactory.newKieServicesClient(configuration);
UserTaskServicesClient taskClient =  client.getServicesClient(UserTaskServicesClient.class);

// try to get a non existing task
taskClient.findTaskById(123456l);

Exception thrown on server side

10:59:35,212 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/kie-server].[org.kie.server.remote.rest.common.KieServerApplication]] (http-127.0.0.1:8180-1) JBWEB000236: Servlet.service() for servlet org.kie.server.remote.rest.common.KieServerApplication threw exception: org.jboss.resteasy.spi.UnhandledException: java.lang.NullPointerException
	at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:367) [resteasy-jaxrs-2.3.13.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:235) [resteasy-jaxrs-2.3.13.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:211) [resteasy-jaxrs-2.3.13.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:576) [resteasy-jaxrs-2.3.13.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:543) [resteasy-jaxrs-2.3.13.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:128) [resteasy-jaxrs-2.3.13.Final-redhat-1.jar:]
	at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) [resteasy-jaxrs-2.3.13.Final-redhat-1.jar:]
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) [resteasy-jaxrs-2.3.13.Final-redhat-1.jar:]
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) [resteasy-jaxrs-2.3.13.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-7.5.15.Final-redhat-1.jar:7.5.15.Final-redhat-1]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.5.15.Final-redhat-1.jar:7.5.15.Final-redhat-1]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:231) [jbossweb-7.5.15.Final-redhat-1.jar:7.5.15.Final-redhat-1]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.5.15.Final-redhat-1.jar:7.5.15.Final-redhat-1]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:512) [jbossweb-7.5.15.Final-redhat-1.jar:7.5.15.Final-redhat-1]
	at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.5.7.Final-redhat-3.jar:7.5.7.Final-redhat-3]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:150) [jbossweb-7.5.15.Final-redhat-1.jar:7.5.15.Final-redhat-1]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.5.15.Final-redhat-1.jar:7.5.15.Final-redhat-1]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.5.15.Final-redhat-1.jar:7.5.15.Final-redhat-1]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) [jbossweb-7.5.15.Final-redhat-1.jar:7.5.15.Final-redhat-1]
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:854) [jbossweb-7.5.15.Final-redhat-1.jar:7.5.15.Final-redhat-1]
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:654) [jbossweb-7.5.15.Final-redhat-1.jar:7.5.15.Final-redhat-1]
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) [jbossweb-7.5.15.Final-redhat-1.jar:7.5.15.Final-redhat-1]
	at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_71]
Caused by: java.lang.NullPointerException
	at org.kie.server.services.jbpm.ConvertUtils.convertToTask(ConvertUtils.java:290) [kie-server-services-jbpm-6.5.0.Final-redhat-2.jar:6.5.0.Final-redhat-2]
	at org.kie.server.services.jbpm.RuntimeDataServiceBase.getTaskById(RuntimeDataServiceBase.java:356) [kie-server-services-jbpm-6.5.0.Final-redhat-2.jar:6.5.0.Final-redhat-2]
	at org.kie.server.remote.rest.jbpm.RuntimeDataResource.getTaskById(RuntimeDataResource.java:336) [kie-server-rest-jbpm-6.5.0.Final-redhat-2.jar:6.5.0.Final-redhat-2]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.8.0_71]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [rt.jar:1.8.0_71]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_71]
	at java.lang.reflect.Method.invoke(Method.java:497) [rt.jar:1.8.0_71]
	at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:168) [resteasy-jaxrs-2.3.13.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:269) [resteasy-jaxrs-2.3.13.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:227) [resteasy-jaxrs-2.3.13.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:216) [resteasy-jaxrs-2.3.13.Final-redhat-1.jar:]
	at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:561) [resteasy-jaxrs-2.3.13.Final-redhat-1.jar:]
	... 20 more

With this exception the client is throwing a 500 meaningless error. But the client should thrown a 404 error, such as(the following exception is thrown by other methods, such as `taskClient.getTaskInstance`):

Exception in thread "main" org.kie.server.client.KieServicesException: Unexpected HTTP response code when requesting URI 'http://localhost:8180/kie-server/services/rest/server/containers/rewards/tasks/123456'! Error code: 404, message: Could not find task instance with id "123,456"
	at org.kie.server.client.impl.AbstractKieServicesClientImpl.createExceptionForUnexpectedResponseCode(AbstractKieServicesClientImpl.java:551)
	at org.kie.server.client.impl.AbstractKieServicesClientImpl.makeHttpGetRequestAndCreateCustomResponse(AbstractKieServicesClientImpl.java:189)
	at org.kie.server.client.impl.UserTaskServicesClientImpl.getTaskInstance(UserTaskServicesClientImpl.java:759)
	at reproducer.KieServerClientSample.main(KieServerClientSample.java:42)

is cloned by

RHBPMS-4558 [GSS](6.4.z) NPE when searching nonexistent task using the method UserTaskServicesClient.findTaskById

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