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From "Michael Sunde" <msu...@actional.com>
Subject BeanShellDef - java.lang.LinkageError: duplicate class definition: AList
Date Fri, 23 Jan 2004 04:04:55 GMT
Hi,
 
I have been playing with the beanshelldef class defined by Peter in thread:
http://marc.theaimsgroup.com/?l=ant-dev <http://marc.theaimsgroup.com/?l=ant-dev&m=106577547220771&w=2>
&m=106577547220771&w=2
 
Occasionally, I get a duplicate class definition error when using a task defined by beanshelldef.
I can reproduce the problem by using antcall. The attached build file works fine if I call
the 'test' target but fails when the 'call' target is invoked. Is there a new version of BeanShellDef
with this problem fixed? It seems like beanshelldef is executed twice.
 
Since we know the name of the task that is being created, is it possible to delay the compilation
of the beanshelldef code until it is used, to improve startup performance?
 
Ant version: 1.6
BeanShell: 2.0beta1
 
This task has turned out to be extremely useful. I hope it makes it into the next version
of ant. 
 
Thanks,
Michael
 
build.xml
=============================
<project name="echo" basedir=".">
    <typedef name="beanshelldef" classname="BeanShellDef"/>
    <beanshelldef name="test1" classname="AList">
      import org.apache.tools.ant.Task;
      public class AList extends Task {
         String message = null;
         public void setMessage(String message) {
             this.message = message;
         }
         public void execute() {
            System.out.println("message is " + message);
         }
     }
    </beanshelldef>
    <test1 message="hello world"/>
 
    <macrodef name="testMacro">
        <attribute name="message"/>
        <sequential>
            <test1 message="@{message}"/>
        </sequential>
    </macrodef>
    <testMacro message="Hello from Macro"/>
    
    <target name="test">
        <test1 message="hello from target test"/>
        <testMacro message="hello from target test in macro"/>
    </target>
    
    <target name="call">
        <antcall target="test"/>
    </target>
</project>

 
Error
=============================
E:\builds\sst2>ant  call
Buildfile: build.xml
    [test1] message is hello world
    [test1] message is Hello from Macro
 
call:
[beanshelldef] java.lang.reflect.InvocationTargetException
[beanshelldef]  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[beanshelldef]  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
[beanshelldef]  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[beanshelldef]  at java.lang.reflect.Method.invoke(Method.java:324)
[beanshelldef]  at bsh.Reflect.invokeOnMethod(Unknown Source)
[beanshelldef]  at bsh.Reflect.invokeObjectMethod(Unknown Source)
[beanshelldef]  at bsh.BshClassManager.defineClass(Unknown Source)
[beanshelldef]  at bsh.ClassGeneratorImpl.generateClassImpl(Unknown Source)
[beanshelldef]  at bsh.ClassGeneratorImpl.generateClass(Unknown Source)
[beanshelldef]  at bsh.BSHClassDeclaration.eval(Unknown Source)
[beanshelldef]  at bsh.Interpreter.eval(Unknown Source)
[beanshelldef]  at bsh.Interpreter.eval(Unknown Source)
[beanshelldef]  at bsh.Interpreter.eval(Unknown Source)
[beanshelldef]  at BeanShellDef.execute(BeanShellDef.java:95)
[beanshelldef]  at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:306)
[beanshelldef]  at org.apache.tools.ant.Task.perform(Task.java:401)
[beanshelldef]  at org.apache.tools.ant.Target.execute(Target.java:338)
[beanshelldef]  at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:172)
[beanshelldef]  at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:126)
[beanshelldef]  at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:382)
[beanshelldef]  at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:144)
[beanshelldef]  at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:306)
[beanshelldef]  at org.apache.tools.ant.Task.perform(Task.java:401)
[beanshelldef]  at org.apache.tools.ant.Target.execute(Target.java:338)
[beanshelldef]  at org.apache.tools.ant.Target.performTasks(Target.java:365)
[beanshelldef]  at org.apache.tools.ant.Project.executeTarget(Project.java:1237)
[beanshelldef]  at org.apache.tools.ant.Project.executeTargets(Project.java:1094)
[beanshelldef]  at org.apache.tools.ant.Main.runBuild(Main.java:669)
[beanshelldef]  at org.apache.tools.ant.Main.startAnt(Main.java:220)
[beanshelldef]  at org.apache.tools.ant.launch.Launcher.run(Launcher.java:215)
[beanshelldef]  at org.apache.tools.ant.launch.Launcher.main(Launcher.java:90)
[beanshelldef] Caused by: java.lang.LinkageError: duplicate class definition: AList
[beanshelldef]  at java.lang.ClassLoader.defineClass0(Native Method)
[beanshelldef]  at java.lang.ClassLoader.defineClass(ClassLoader.java:502)
[beanshelldef]  at java.lang.ClassLoader.defineClass(ClassLoader.java:431)
[beanshelldef]  ... 31 more
[beanshelldef] bsh.InterpreterError: Unable to define class: java.lang.reflect.InvocationTargetException
[beanshelldef]  at bsh.BshClassManager.defineClass(Unknown Source)
[beanshelldef]  at bsh.ClassGeneratorImpl.generateClassImpl(Unknown Source)
[beanshelldef]  at bsh.ClassGeneratorImpl.generateClass(Unknown Source)
[beanshelldef]  at bsh.BSHClassDeclaration.eval(Unknown Source)
[beanshelldef]  at bsh.Interpreter.eval(Unknown Source)
[beanshelldef]  at bsh.Interpreter.eval(Unknown Source)
[beanshelldef]  at bsh.Interpreter.eval(Unknown Source)
[beanshelldef]  at BeanShellDef.execute(BeanShellDef.java:95)
[beanshelldef]  at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:306)
[beanshelldef]  at org.apache.tools.ant.Task.perform(Task.java:401)
[beanshelldef]  at org.apache.tools.ant.Target.execute(Target.java:338)
[beanshelldef]  at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:172)
[beanshelldef]  at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:126)
[beanshelldef]  at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:382)
[beanshelldef]  at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:144)
[beanshelldef]  at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:306)
[beanshelldef]  at org.apache.tools.ant.Task.perform(Task.java:401)
[beanshelldef]  at org.apache.tools.ant.Target.execute(Target.java:338)
[beanshelldef]  at org.apache.tools.ant.Target.performTasks(Target.java:365)
[beanshelldef]  at org.apache.tools.ant.Project.executeTarget(Project.java:1237)
[beanshelldef]  at org.apache.tools.ant.Project.executeTargets(Project.java:1094)
[beanshelldef]  at org.apache.tools.ant.Main.runBuild(Main.java:669)
[beanshelldef]  at org.apache.tools.ant.Main.startAnt(Main.java:220)
[beanshelldef]  at org.apache.tools.ant.launch.Launcher.run(Launcher.java:215)
[beanshelldef]  at org.apache.tools.ant.launch.Launcher.main(Launcher.java:90)
 
BUILD FAILED
E:\builds\sst2\build.xml:33: Following error occured while executing this line
E:\builds\sst2\build.xml:5: Sourced file: inline evaluation of: ``       import org.apache.tools.ant.Task;
      public class AList extends Task { . . . '' internal Error: Unable to define class: java.
lang.reflect.InvocationTargetException : at Line: 3 : in file: inline evaluation of: ``  
    import org.apache.tools.ant.Task;       public class AList extends Task { . . . '' : public
class AList ex
tends Task {
 

Total time: 6 seconds

 
 
 
 

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