jbpm读取流程定义文件异常

下面是一个赛跑的小流程。这里我已经把流程持久化到数据库中。
为什么第一种方法不行呢？
代码如下：
类都实现ActionHandler接口：
方法都类似RunAction类。如下：
RunAction： public void execute(ExecutionContext executionContext) throws Exception {System.out.println("开始了...");}
MatchAction：{System.out.println("比赛中...");
PauseAction：System.out.println("受伤了...");
EndAction：System.out.println("比赛结束!");

Test1类：
ProcessDefinition processDefinition = ProcessDefinition.parseXmlResource("E:\\workspace\\articleaudit\\WebRoot\\WEB-INF\\test1\\processdefinition.xml");
 ProcessInstance ProcessInstance = new ProcessInstance(processDefinition);

        Token token = ProcessInstance.getRootToken();
        
        System.out.println(token.getNode().getName());
        token.signal("tr1");
        System.out.println(token.getNode().getName());
        token.signal();
        System.out.println(token.getNode().getName());

程序运行到第1句就异常了，下面是所有异常信息：
16:32:21,093  INFO JbpmConfiguration:277 - using jbpm configuration resource 'jbpm.cfg.xml'
16:32:21,453 ERROR JpdlXmlReader:158 - couldn't parse process definition
org.dom4j.DocumentException: null Nested exception: null
at org.dom4j.io.SAXReader.read(SAXReader.java:484)
at org.jbpm.jpdl.xml.JpdlParser.parse(JpdlParser.java:57)
at org.jbpm.jpdl.xml.JpdlXmlReader.readProcessDefinition(JpdlXmlReader.java:138)
at org.jbpm.graph.def.ProcessDefinition.parseXmlInputStream(ProcessDefinition.java:172)
at org.jbpm.graph.def.ProcessDefinition.parseXmlResource(ProcessDefinition.java:153)
at test1.struts.Test1.main(Test1.java:11)
Nested exception:
java.net.MalformedURLException
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at org.dom4j.io.SAXReader.read(SAXReader.java:465)
at org.jbpm.jpdl.xml.JpdlParser.parse(JpdlParser.java:57)
at org.jbpm.jpdl.xml.JpdlXmlReader.readProcessDefinition(JpdlXmlReader.java:138)
at org.jbpm.graph.def.ProcessDefinition.parseXmlInputStream(ProcessDefinition.java:172)
at org.jbpm.graph.def.ProcessDefinition.parseXmlResource(ProcessDefinition.java:153)
at test1.struts.Test1.main(Test1.java:11)
Exception in thread "main" org.jbpm.jpdl.JpdlException: [[ERROR] couldn't parse process definition]
at org.jbpm.jpdl.xml.JpdlXmlReader.readProcessDefinition(JpdlXmlReader.java:163)
at org.jbpm.graph.def.ProcessDefinition.parseXmlInputStream(ProcessDefinition.java:172)
at org.jbpm.graph.def.ProcessDefinition.parseXmlResource(ProcessDefinition.java:153)
at test1.struts.Test1.main(Test1.java:11)

****************************************************************

但当我把第一句改为直接写的方式：

ProcessDefinition processDefinition = ProcessDefinition.parseXmlString("" +
				"<process-definition  xmlns='urn:jbpm.org:jpdl-3.1'  name='test1'>" +
				"<start-state name=\"开始\">" +
				"<event type=\"node-leave\">" +
				"<action name=\"action1\"></action></event>" +
				"<transition name=\"tr1\" to=\"赛跑中\"></transition>" +
				"<transition name=\"tr2\" to=\"受伤中\"></transition>" +
				"</start-state>" +
				"<state name=\"赛跑中\">" +
				"<event type=\"node-enter\">" +
				"<action name=\"赛跑\" class=\"test1.struts.MatchAction\"></action>" +
				"</event>" +
				"<transition name=\"结束\" to=\"比赛结束\"></transition></state>" +
				"<state name=\"受伤中\">" +
				"<event type=\"node-enter\">" +
				"<action name=\"受伤\" class=\"test1.struts.PauseAction\"></action>" +
				"</event>" +
				"<transition name=\"结束\" to=\"比赛结束\"></transition></state>" +
				"<end-state name=\"比赛结束\">" +
				"<event type=\"node-enter\">" +
				" <action name=\"结束\" class=\"test1.struts.EndAction\"></action></event>" +
				"</end-state>" +
				"</process-definition>");

正常输出：
开始
比赛中...
赛跑中
比赛结束!
比赛结束
为什么前一方式不行呢？
帮助文档上就这么一句：

引用

15.2.2. 解析xml文件
其他情况, 你可能想手写 processdefinition.xml 文件然后打包进zip文件通过ant script.这钟情况下你可以选择 JpdlXmlReader

...
static ProcessDefinition auctionProcess =
    ProcessDefinition.parseXmlResource("org/jbpm/tdd/auction.xml");
...