第一个实现的jbpm的例子以及遇到的问题解决方案

第一个jbpm的例子实现步骤：

第一步：在eclipse中新建一个java project,项目名称为：jbpmExample_1。

 

第二步：导入Junit和jbpm的jar.

 

第三步：将jbpm下的config中的jbpm.cfg.xml拷贝到src目录下。

 

第四步：新建一个Junit Test Case 类名为：TestHelloWorld，代码如下：

package com.baoz.je.test;

import junit.framework.TestCase;

import org.jbpm.graph.def.ProcessDefinition;
import org.jbpm.graph.exe.ProcessInstance;
import org.jbpm.graph.exe.Token;

public class TestHelloWorld extends TestCase {

	protected void setUp() throws Exception {
		
	}
	
	public void testHelloWorldProcess(){
		ProcessDefinition processDefinition = new ProcessDefinition().parseXmlString("" +
				"<process-definition>" +" <start-state>" +
				" <transition to='s'/> " +" </start-state>" +
				" <state name='s'>" +" <transition to='end'/>" +
				" </state>" +" <end-state name='end'/>  " +
				"</process-definition>");
		
		ProcessInstance processInstance = new ProcessInstance(processDefinition);
		Token token = processInstance.getRootToken();
		assertSame(processDefinition.getStartState(), token.getNode());
		System.out.println("processDefinition.getStartState()="+processDefinition.getStartState().getName());
		System.out.println("token.getNode()="+token.getNode().getName());
		token.signal();
		assertSame(processDefinition.getNode("s"), token.getNode());
		System.out.println("processDefinition.getNode('s')="+processDefinition.getNode("s").getName());
		System.out.println("token.getNode()="+token.getNode().getName());
		token.signal();
		assertSame(processDefinition.getNode("end"), token.getNode());
		System.out.println("processDefinition.getNode('end')="+processDefinition.getNode("end").getName());
		System.out.println("token.getNode()="+token.getNode().getName());
		
	}

	protected void tearDown() throws Exception {
		super.tearDown();
	}

}

 

第五步：运行如上的Test Case，如果没有报错，而且控制台打印出如下的内容，表示此示例运行成功：

processDefinition.getStartState()=null
token.getNode()=null
processDefinition.getNode('s')=s
token.getNode()=s
processDefinition.getNode('end')=end
token.getNode()=end

 

注意点：假如你的项目中报如下错误：

org.jbpm.JbpmException: couldn't parse jbpm configuration from resource 'jbpm.cfg.xml'
	at org.jbpm.JbpmConfiguration.getInstance(JbpmConfiguration.java:292)
	at org.jbpm.JbpmConfiguration.getInstance(JbpmConfiguration.java:257)
	at org.jbpm.JbpmConfiguration$Configs.getObjectFactory(JbpmConfiguration.java:425)
	at org.jbpm.JbpmConfiguration$Configs.getObject(JbpmConfiguration.java:437)
	at org.jbpm.JbpmConfiguration$Configs.getString(JbpmConfiguration.java:441)
	at org.jbpm.graph.def.ProcessDefinition.createNewProcessDefinition(ProcessDefinition.java:97)
	at org.jbpm.jpdl.xml.JpdlXmlReader.readProcessDefinition(JpdlXmlReader.java:138)
	at org.jbpm.graph.def.ProcessDefinition.parseXmlString(ProcessDefinition.java:150)
	at com.baoz.je.test.TestHelloWorld.testHelloWorldProcess(TestHelloWorld.java:16)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at junit.framework.TestCase.runTest(TestCase.java:154)
	at junit.framework.TestCase.runBare(TestCase.java:127)
	at junit.framework.TestResult$1.protect(TestResult.java:106)
	at junit.framework.TestResult.runProtected(TestResult.java:124)
	at junit.framework.TestResult.run(TestResult.java:109)
	at junit.framework.TestCase.run(TestCase.java:118)
	at junit.framework.TestSuite.runTest(TestSuite.java:208)
	at junit.framework.TestSuite.run(TestSuite.java:203)
	at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: org.jbpm.JbpmException: jbpm configuration resource 'jbpm.cfg.xml' is not available
	at org.jbpm.JbpmConfiguration.getInstance(JbpmConfiguration.java:286)
	... 26 more

 那么说明你没有将jbpm下的config中的jbpm.cfg.xml拷贝到src目录下，只有将jbpm下的config中的jbpm.cfg.xml拷贝到src目录下就能解决此问题，尽管jbpm.cfg.xml中没有内容，但是也必须拷贝进来。