a problem of org.mozilla.javascript

hi all.
I run a processes's demo with JavaScriptToolAgent.There is an application in the demo xpdl file.If the script is:
"
java.lang.System.out.println("run script...");
outvalue=java.lang.Math.random()*10*invalue;
java.lang.System.out.println("return value:"+outvalue);
"
then run OK. If change the script is:
"
java.lang.System.out.println("invoke com.shell.java.JavaCall");
outvalue=com.shell.java.JavaCall.calDouble(invalue);
java.lang.System.out.println("invoke com.shell.java.JavaCall and return value:"+outvalue);
"
/*
the JavaCall is a javabean that I use to test. its code:

package com.shell.java;
public class JavaCall {
    public static Double calDouble(Double inputValue) {
        Double db = new Double(inputValue.doubleValue() * 10.0);
        return db;
    }
}

*/

then run error:
org.mozilla.javascript.EcmaError: ReferenceError: "com" is not defined. (<script>#2)
	at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3240)
	at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3230)
	at org.mozilla.javascript.ScriptRuntime.notFoundError(ScriptRuntime.java:3303)
	at org.mozilla.javascript.ScriptRuntime.name(ScriptRuntime.java:1566)
	at org.mozilla.javascript.gen.c1._c0(<script>:2)
	at org.mozilla.javascript.gen.c1.call(<script>)
	at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:304)
	at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:2769)
	at org.mozilla.javascript.gen.c1.call(<script>)
	at org.mozilla.javascript.gen.c1.exec(<script>)
	at org.mozilla.javascript.Context.evaluateReader(Context.java:1251)
	at org.enhydra.shark.toolagent.JavaScriptToolAgent.invokeApplication(JavaScriptToolAgent.java:76)
	at org.enhydra.shark.toolagent.DefaultToolAgent.invokeApplication(DefaultToolAgent.java:72)
	at org.enhydra.shark.ToolAgentManagerImpl$ToolRunner.invokeApplication(ToolAgentManagerImpl.java:211)
	at org.enhydra.shark.ToolAgentManagerImpl$ToolRunner.run(ToolAgentManagerImpl.java:96)
	at org.enhydra.shark.ToolAgentManagerImpl.executeActivity(ToolAgentManagerImpl.java:67)
	at org.enhydra.shark.WfActivityImpl.runTool(WfActivityImpl.java:1269)
	at org.enhydra.shark.WfActivityImpl.startActivity(WfActivityImpl.java:1212)
	at org.enhydra.shark.WfActivityImpl.activate(WfActivityImpl.java:1157)
	at org.enhydra.shark.WfProcessImpl.startActivity(WfProcessImpl.java:816)
	at org.enhydra.shark.WfProcessImpl.queueNext(WfProcessImpl.java:997)
	at org.enhydra.shark.WfProcessImpl.run(WfProcessImpl.java:703)
	at org.enhydra.shark.WfProcessImpl.activity_complete(WfProcessImpl.java:862)
	at org.enhydra.shark.WfActivityImpl.finish(WfActivityImpl.java:373)
	at org.enhydra.shark.WfActivityImpl.complete(WfActivityImpl.java:302)
	at org.enhydra.shark.WfActivityWrapper.complete(WfActivityWrapper.java:391)
	at org.enhydra.shark.WfActivityWrapper.complete(WfActivityWrapper.java:359)
	at com.shark.util.SharkClientUtil.activityComplete(SharkClientUtil.java:227)
	at test.SharkTest.testScript(SharkTest.java:244)
	at test.SharkTest.main(SharkTest.java:264)
org.enhydra.shark.api.internal.toolagent.ToolAgentGeneralException: ReferenceError: "com" is not defined. (<script>#2)
	at org.enhydra.shark.toolagent.JavaScriptToolAgent.invokeApplication(JavaScriptToolAgent.java:88)
	at org.enhydra.shark.toolagent.DefaultToolAgent.invokeApplication(DefaultToolAgent.java:72)
	at org.enhydra.shark.ToolAgentManagerImpl$ToolRunner.invokeApplication(ToolAgentManagerImpl.java:211)
	at org.enhydra.shark.ToolAgentManagerImpl$ToolRunner.run(ToolAgentManagerImpl.java:96)
	at org.enhydra.shark.ToolAgentManagerImpl.executeActivity(ToolAgentManagerImpl.java:67)
	at org.enhydra.shark.WfActivityImpl.runTool(WfActivityImpl.java:1269)
	at org.enhydra.shark.WfActivityImpl.startActivity(WfActivityImpl.java:1212)
	at org.enhydra.shark.WfActivityImpl.activate(WfActivityImpl.java:1157)
	at org.enhydra.shark.WfProcessImpl.startActivity(WfProcessImpl.java:816)
	at org.enhydra.shark.WfProcessImpl.queueNext(WfProcessImpl.java:997)
	at org.enhydra.shark.WfProcessImpl.run(WfProcessImpl.java:703)
	at org.enhydra.shark.WfProcessImpl.activity_complete(WfProcessImpl.java:862)
	at org.enhydra.shark.WfActivityImpl.finish(WfActivityImpl.java:373)
	at org.enhydra.shark.WfActivityImpl.complete(WfActivityImpl.java:302)
	at org.enhydra.shark.WfActivityWrapper.complete(WfActivityWrapper.java:391)
	at org.enhydra.shark.WfActivityWrapper.complete(WfActivityWrapper.java:359)
	at com.shark.util.SharkClientUtil.activityComplete(SharkClientUtil.java:227)
	at test.SharkTest.testScript(SharkTest.java:244)
	at test.SharkTest.main(SharkTest.java:264)
Caused by: org.mozilla.javascript.EcmaError: ReferenceError: "com" is not defined. (<script>#2)
	at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3240)
	at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3230)
	at org.mozilla.javascript.ScriptRuntime.notFoundError(ScriptRuntime.java:3303)
	at org.mozilla.javascript.ScriptRuntime.name(ScriptRuntime.java:1566)
	at org.mozilla.javascript.gen.c1._c0(<script>:2)
	at org.mozilla.javascript.gen.c1.call(<script>)
	at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:304)
	at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:2769)
	at org.mozilla.javascript.gen.c1.call(<script>)
	at org.mozilla.javascript.gen.c1.exec(<script>)
	at org.mozilla.javascript.Context.evaluateReader(Context.java:1251)
	at org.enhydra.shark.toolagent.JavaScriptToolAgent.invokeApplication(JavaScriptToolAgent.java:76)
	... 18 more
org.enhydra.shark.api.client.wfbase.BaseException: ReferenceError: "com" is not defined. (<script>#2)
	at org.enhydra.shark.WfActivityImpl.finish(WfActivityImpl.java:389)
	at org.enhydra.shark.WfActivityImpl.complete(WfActivityImpl.java:302)
	at org.enhydra.shark.WfActivityWrapper.complete(WfActivityWrapper.java:391)
	at org.enhydra.shark.WfActivityWrapper.complete(WfActivityWrapper.java:359)
	at com.shark.util.SharkClientUtil.activityComplete(SharkClientUtil.java:227)
	at test.SharkTest.testScript(SharkTest.java:244)
	at test.SharkTest.main(SharkTest.java:264)
Caused by: org.enhydra.shark.api.internal.toolagent.ToolAgentGeneralException: ReferenceError: "com" is not defined. (<script>#2)
	at org.enhydra.shark.toolagent.JavaScriptToolAgent.invokeApplication(JavaScriptToolAgent.java:88)
	at org.enhydra.shark.toolagent.DefaultToolAgent.invokeApplication(DefaultToolAgent.java:72)
	at org.enhydra.shark.ToolAgentManagerImpl$ToolRunner.invokeApplication(ToolAgentManagerImpl.java:211)
	at org.enhydra.shark.ToolAgentManagerImpl$ToolRunner.run(ToolAgentManagerImpl.java:96)
	at org.enhydra.shark.ToolAgentManagerImpl.executeActivity(ToolAgentManagerImpl.java:67)
	at org.enhydra.shark.WfActivityImpl.runTool(WfActivityImpl.java:1269)
	at org.enhydra.shark.WfActivityImpl.startActivity(WfActivityImpl.java:1212)
	at org.enhydra.shark.WfActivityImpl.activate(WfActivityImpl.java:1157)
	at org.enhydra.shark.WfProcessImpl.startActivity(WfProcessImpl.java:816)
	at org.enhydra.shark.WfProcessImpl.queueNext(WfProcessImpl.java:997)
	at org.enhydra.shark.WfProcessImpl.run(WfProcessImpl.java:703)
	at org.enhydra.shark.WfProcessImpl.activity_complete(WfProcessImpl.java:862)
	at org.enhydra.shark.WfActivityImpl.finish(WfActivityImpl.java:373)
	... 6 more
Caused by: org.mozilla.javascript.EcmaError: ReferenceError: "com" is not defined. (<script>#2)
	at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3240)
	at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3230)
	at org.mozilla.javascript.ScriptRuntime.notFoundError(ScriptRuntime.java:3303)
	at org.mozilla.javascript.ScriptRuntime.name(ScriptRuntime.java:1566)
	at org.mozilla.javascript.gen.c1._c0(<script>:2)
	at org.mozilla.javascript.gen.c1.call(<script>)
	at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:304)
	at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:2769)
	at org.mozilla.javascript.gen.c1.call(<script>)
	at org.mozilla.javascript.gen.c1.exec(<script>)
	at org.mozilla.javascript.Context.evaluateReader(Context.java:1251)
	at org.enhydra.shark.toolagent.JavaScriptToolAgent.invokeApplication(JavaScriptToolAgent.java:76)
	... 18 more

I downloaded the last released of js.jar which from www.mozilla.org,but have the same problem.Why?

Thanks in advance for your answer!

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