I solved problem.
1) unzip designer.war
2) correct format of .json and .orig files in jboss-5.1.0.GA\server\default\deploy\designer.war\stencilsets\bpmn2.0jbpm\
3) put it in jboss-5.1.0.GA\server\default\deploy (don't zip, as exploded archive.)
Original stencil files are not well formatted.(German format)
You need to correct before deployment.