Hi I'm using jBPM-4.2 with Tomcat and PostgreSQL. I have the following process, that the only thing it does is print a message Hello World. When I run an instance of the process I get the following error, and I want to know if some configuration or covered | URL: 'http://localhost:8080/gwt-console-server/rs/process/definition/Java-1/new_instance' | Action: 'org.jboss.bpm.console.client.process.StartNewInstanceAction' | Exception: 'class com.google.gwt.http.client.RequestException' | HTTP 500: Unknown error | Proceso: | <?xml version="1.0" encoding="UTF-8"?> | <process name="HolaMundo" xmlns="http://jbpm.org/4.0/jpdl"> | <start name="start1" g="81,123,48,48"> | <transition name="to java1" to="java1" g="-45,-18"/> | </start> | <java name="java1" | class="com.procesos.holamundo.Mensaje" | method="hola" | g="170,122,92,52"> | <field name="mensaje"><string value="HOLA MUNDO"/></field> | <arg><string value="jBPM"/></arg> | <transition name="to end1" to="end1" g="-42,-18"/> | </java> | <end name="end1" g="304,123,48,48"/> | </process> | Gracias View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4265500#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...