at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378) 
	at java.lang.Thread.run(Thread.java:748) 
Caused by: java.lang.NoClassDefFoundError: org/gjt/xpp/XmlStartTag 
	at java.lang.Class.getDeclaredFields0(Native Method) 
	at java.lang.Class.privateGetDeclaredFields(Class.java:2583) 
	at java.lang.Class.getDeclaredFields(Class.java:1916) 
	at com.thoughtworks.xstream.mapper.AnnotationMapper.processTypes(AnnotationMapper.java:205) 
	at com.thoughtworks.xstream.mapper.AnnotationMapper.processAnnotations(AnnotationMapper.java:165) 
	at com.thoughtworks.xstream.XStream.processAnnotations(XStream.java:2320) 
	at com.thoughtworks.xstream.XStream.processAnnotations(XStream.java:2331) 
	at org.kie.server.api.marshalling.xstream.XStreamMarshaller.configureMarshaller(XStreamMarshaller.java:205) 
	at org.kie.server.api.marshalling.xstream.XStreamMarshaller.<init>(XStreamMarshaller.java:110) 
	at org.kie.server.api.marshalling.BaseMarshallerBuilder.build(BaseMarshallerBuilder.java:37) 
	at org.kie.server.api.marshalling.MarshallerFactory.getMarshaller(MarshallerFactory.java:52) 
	at org.kie.server.services.impl.KieContainerInstanceImpl.getMarshaller(KieContainerInstanceImpl.java:184) 
	at org.kie.server.services.impl.marshal.MarshallerHelper.unmarshal(MarshallerHelper.java:102) 
	at org.kie.server.services.impl.marshal.MarshallerHelper.unmarshal(MarshallerHelper.java:87) 
	at org.kie.server.remote.rest.optaplanner.SolverResource.createSolver(SolverResource.java:114) 
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
	at java.lang.reflect.Method.invoke(Method.java:498) 
	at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:140) 
	at org.jboss.resteasy.core.ResourceMethodInvoker.internalInvokeOnTarget(ResourceMethodInvoker.java:509) 
	at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTargetAfterFilter(ResourceMethodInvoker.java:399) 
	at org.jboss.resteasy.core.ResourceMethodInvoker.lambda$invokeOnTarget$0(ResourceMethodInvoker.java:363) 
	at org.jboss.resteasy.core.interception.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:358) 
	at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:365) 
	at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:337) 
	at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:310) 
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:443) 
	... 53 more