[jboss-user] [jBPM] - Re: java.lang.String cannot be cast to org.jbpm.task.utils.MarshalledContentWrapper

Exception in thread "main" java.lang.ExceptionInInitializerError           at org.jbpm.process.builder.dialect.java.JavaProcessDialect.<clinit>(JavaProcessDialect.java:21)           at org.jbpm.process.builder.dialect.ProcessDialectRegistry.<clinit>(ProcessDialectRegistry.java:15)           at org.jbpm.bpmn2.BPMN2ProcessProviderImpl.<clinit>(BPMN2ProcessProviderImpl.java:31)           at java.lang.Class.forName0(Native Method)           at java.lang.Class.forName(Class.java:169)           at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:214)           at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.call(ServiceRegistryImpl.java:209)           at org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:164)           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:688)           at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:50)           at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:39)           at com.geneoz.drools.RulesEngineBuilder.buildKB(RulesEngineBuilder.java:127)           at com.geneoz.drools.RulesEngineBuilder.build(RulesEngineBuilder.java:94)           at com.geneoz.drools.RulesEngineBuilder.main(RulesEngineBuilder.java:63) Caused by: org.mvel2.templates.TemplateError: null input stream           at org.mvel2.templates.util.TemplateTools.readStream(TemplateTools.java:113)           at org.mvel2.templates.TemplateCompiler.compileTemplate(TemplateCompiler.java:414)           at org.mvel2.templates.TemplateCompiler.compileTemplate(TemplateCompiler.java:405)           at org.mvel2.templates.TemplateCompiler.compileTemplate(TemplateCompiler.java:401)           at org.jbpm.process.builder.dialect.java.AbstractJavaProcessBuilder.<clinit>(AbstractJavaProcessBuilder.java:27)           ... 17 more Caused by: java.lang.NullPointerException           at org.mvel2.templates.util.TemplateTools.readStream(TemplateTools.java:103)           ... 21 more