JPDA Trace好不容易找到的

	JPDA Trace tool not picking up classpath 发布: 2007-8-23 下午3:11		回复
Hello: I created a Hello class and followed the instruction on http://java.sun.com/j2se/1.5.0/docs/guide/jpda/trace.html for Tracing the method calls at runtime. However while launching Trace tool, it does not seem to use the classpath setting in order to find my Hello class. Hello.java does not have package directive and is created in "D:\tmp\java-example". As shown below in Step 1, if I run my program from D:\tmp\java-example then the Trace tool is able to find the program. However if I am in any other directory and set D:\tmp\java-example in the CLASSPATH (as shown in Step 2 below) or provide it as value to jvm -classpath argument (as shown in Step 3 below) then the Trace tool is unable to find my Hello class. Step 1: D:\tmp\java-example>java com.sun.tools.example.trace.Trace Hello -- VM Started -- ====== main ====== main -- Hello | <init> -- Hello | methodA -- Hello | | methodC -- Hello | methodB -- Hello ====== main end ====== -- The application exited -- Step: 2 D:\tmp\java-example>echo %CLASSPATH% "D:\tmp\java-example\;C:\Program Files\Java\jdk1.6.0\lib\Tools.jar;C:\Program Files\Java\jdk1.6.0\demo\jpda\;" D:\tmp\java-example>cd .. D:\tmp>java com.sun.tools.example.trace.Trace Hello java.lang.NoClassDefFoundError: Hello Exception in thread "main" -- VM Started -- -- The application exited -- Step: 3 D:\tmp>java -classpath "D:\tmp\java-example\;C:\Program Files\Java\jdk1.6.0\lib\ Tools.jar;C:\Program Files\Java\jdk1.6.0\demo\jpda\;" com.sun.tools.example.trac e.Trace Hello java.lang.NoClassDefFoundError: Hello Exception in thread "main" -- VM Started -- -- The application exited -- Any help is much appreciated. Thanks,

840807 发贴数: 49,988 注册时间: 11-03-01

Re: JPDA Trace tool not picking up classpath 发布: 2007-11-19 上午12:32   回复： 840807   回复 Hi Have you find how to solve this issue?

840807 发贴数: 49,988 注册时间: 11-03-01

Re: JPDA Trace tool not picking up classpath 发布: 2007-11-19 上午2:52   回复： 840807   回复 Hi. After all, it was small bag in the Trace example: In the method Trace.connectorArguments(..) handling of class path should be added: Map connectorArguments(LaunchingConnector connector, String mainArgs) { Map arguments = connector.defaultArguments(); Connector.Argument mainArg = (Connector.Argument)arguments.get("main"); if (mainArg == null) { throw new Error("Bad launching connector"); } mainArg.setValue(mainArgs); // Begin of the fix Connector.Argument optsArg = (Connector.Argument)arguments.get("options"); if (optsArg == null) { throw new Error("Bad launching connector"); } String cp = "-Djava.class.path="+System.getProperty("java.class.path";); optsArg.setValue(cp); // End of the fix That's all.

user5344869 发贴数: 101 注册时间: 10-09-25

Re: JPDA Trace tool not picking up classpath 发布: 2007-12-19 上午8:04   回复： 840807   回复