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Subject: BeanShellDef - java.lang.LinkageError: duplicate class definition:
 AList
Date: Thu, 22 Jan 2004 20:04:55 -0800
Message-ID: <D6525D6FD150E141BFEE2789D76F911E02CE1C8D@ca-exch01.actional.com>
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Thread-Topic: BeanShellDef - java.lang.LinkageError: duplicate class
 definition: AList
Thread-Index: AcPhZiHMqftoQn6tQuSIZfxYEZbHmw==
From: "Michael Sunde" <msunde@actional.com>
To: <dev@ant.apache.org>
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Hi,
=20
I have been playing with the beanshelldef class defined by Peter in =
thread:
http://marc.theaimsgroup.com/?l=3Dant-dev =
<http://marc.theaimsgroup.com/?l=3Dant-dev&m=3D106577547220771&w=3D2> =
&m=3D106577547220771&w=3D2
=20
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.
=20
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?
=20
Ant version: 1.6
BeanShell: 2.0beta1
=20
This task has turned out to be extremely useful. I hope it makes it into =
the next version of ant.=20
=20
Thanks,
Michael
=20
build.xml
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D
<project name=3D"echo" basedir=3D".">
    <typedef name=3D"beanshelldef" classname=3D"BeanShellDef"/>
    <beanshelldef name=3D"test1" classname=3D"AList">
      import org.apache.tools.ant.Task;
      public class AList extends Task {
         String message =3D null;
         public void setMessage(String message) {
             this.message =3D message;
         }
         public void execute() {
            System.out.println("message is " + message);
         }
     }
    </beanshelldef>
    <test1 message=3D"hello world"/>
=20
    <macrodef name=3D"testMacro">
        <attribute name=3D"message"/>
        <sequential>
            <test1 message=3D"@{message}"/>
        </sequential>
    </macrodef>
    <testMacro message=3D"Hello from Macro"/>
   =20
    <target name=3D"test">
        <test1 message=3D"hello from target test"/>
        <testMacro message=3D"hello from target test in macro"/>
    </target>
   =20
    <target name=3D"call">
        <antcall target=3D"test"/>
    </target>
</project>

=20
Error
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D
E:\builds\sst2>ant  call
Buildfile: build.xml
    [test1] message is hello world
    [test1] message is Hello from Macro
=20
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(DelegatingMethodAccessorI=
mpl.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:12=
6)
[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:12=
6)
[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)
=20
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 {
=20

Total time: 6 seconds

=20
=20
=20
=20

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