Activiti生成流程图异常解决(java.awt.image.RasterFromatException)

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在使用Activiti 5.8版本时遇到生成流程图异常，错误信息为`java.awt.image.RasterFormatException: (x + width) is outside raster`。解决方法是将`RepositoryService`转换为`RepositoryServiceImpl`，并通过`getDeployedProcessDefinition`方法获取流程定义，从而避免异常。

Activiti生成流程图代码：

ProcessDefinitionEntity p = (ProcessDefinitionEntity)repositoryService
				.createProcessDefinitionQuery()
				.processDefinitionId("test:2:13708")
				.singleResult();
InputStream in =  ProcessDiagramGenerator.generateDiagram(p,"png", Arrays.asList("usertask1"));

抛出异常：

java.awt.image.RasterFormatException: (x + width) is outside raster

	at sun.awt.image.IntegerInterleavedRaster.createWritableChild(Unknown Source)
	at java.awt.image.BufferedImage.getSubimage(Unknown Source)
	at org.activiti.engine.impl.bpmn.diagram.ProcessDiagramCanvas.generateImage(ProcessDiagramCanvas.java:168)
	at org.activiti.engine.impl.bpmn.diagram.ProcessDiagramGenerator.generateDiagram(ProcessDiagramGenerator.java:236)
	at com.iyspace.test.BaseTest.genPng(BaseTest.java:172)
	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 org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82)
	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:240)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:180)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

解决方法：将RepositoryService 转换为 RepositoryServiceImpl 对象通过该对象的 getDeployedProcessDefinition方法来获取流程定义

RepositoryServiceImpl imp = (RepositoryServiceImpl)repositoryService;
		ProcessDefinitionEntity entity2 = (ProcessDefinitionEntity)imp.getDeployedProcessDefinition("test:2:13708");
		InputStream in =  ProcessDiagramGenerator.generateDiagram(p,"png", Arrays.asList("usertask1"));

Activit版本 5.8