学步园

在分两次加载的情况下，jbpm子流程定义文件加载顺序:必须先加载子流程，后加载主流程，否则会出现如下的错误：

org.jbpm.JbpmException: can't create a process instance when processDefinition is null
    at org.jbpm.graph.exe.ProcessInstance.(ProcessInstance.java:127)
    at org.jbpm.graph.exe.ProcessInstance.(ProcessInstance.java:96)
    at org.jbpm.graph.exe.Token.createSubProcessInstance(Token.java:723)
    at org.jbpm.graph.node.ProcessState.execute(ProcessState.java:175)
    at org.jbpm.graph.def.Node.enter(Node.java:388)