ananda Dayyala [https://community.jboss.org/people/dayyala] created the discussion "Unable to instantiate service for Class 'org.drools.compiler.BPMN2ProcessProvide in jBPM" To view the discussion, visit: https://community.jboss.org/message/793155#793155 -------------------------------------------------------------- Hi Friends, I am ananda reddy dayyala, working fro Ericsson. Just i started working with JBPM. I am getting the below error when i start ProcessMain.java file from the eclipse.Can any one help me to solve this issue . your help will be appreciated . Exception in thread "main" java.lang.IllegalArgumentException: Unable to instantiate service for Class 'org.drools.compiler.BPMN2ProcessProvider'     at org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:166)     at org.drools.compiler.BPMN2ProcessFactory.loadProvider(BPMN2ProcessFactory.java:28)     at org.drools.compiler.BPMN2ProcessFactory.getBPMN2ProcessProvider(BPMN2ProcessFactory.java:20)     at org.drools.compiler.BPMN2ProcessFactory.configurePackageBuilder(BPMN2ProcessFactory.java:11)     at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:708)     at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:51)     at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:40)     at com.sample.ProcessMain.readKnowledgeBase(ProcessMain.java:25)     at com.sample.ProcessMain.main(ProcessMain.java:17) Caused by: java.lang.IllegalArgumentException: Unable to instantiate 'org.jbpm.bpmn2.BPMN2ProcessProviderImpl'     at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:217)     at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.call(ServiceRegistryImpl.java:209)     at org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:164)     ... 8 more Caused by: java.lang.ClassNotFoundException: org.jbpm.bpmn2.BPMN2ProcessProviderImpl     at java.net.URLClassLoader$1.run(Unknown Source)     at java.net.URLClassLoader$1.run(Unknown Source)     at java.security.AccessController.doPrivileged(Native Method)     at java.net.URLClassLoader.findClass(Unknown Source)     at java.lang.ClassLoader.loadClass(Unknown Source)     at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)     at java.lang.ClassLoader.loadClass(Unknown Source)     at java.lang.Class.forName0(Native Method)     at java.lang.Class.forName(Unknown Source)     at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:214)     ... 10 more Thanks, Ananda -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/793155#793155] Start a new discussion in JBoss AOP at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]