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[platform-ant-dev] loader constraints violated when linking org/apache/tools/ant/BuildListener
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Hi,
Problem:
********
loader constraints violated when linking org/apache/tools/ant/BuildListener class
Setup:
******
We use Eclipse 2.0 under windows NT.
Class relationship diagram:
***************************
*********** *************
* Builder *---->* AntRunner *
*********** *************
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********************* ***********************************
* SampleBuildLogger *----->* Test *
********************* ***********************************
* BuildListener getBuildListener()*
***********************************
Description:
************
We have a plugin which has a "Builder" class. It uses "AntRunner" class to execute ANT script. The following code snippet shows the same.
AntRunner runner = new AntRunner();
runner.addBuildLogger(BUILD_LOGGER);
runner.run();
Here, BUILD_LOGGER class is "SampleBuildLogger" implementing "BuildLogger" interface. This is is packaged a separate jar and put under the lib folder of the plugin.
The following contribution is made in the "plugin.xml" of the plugin
<extension
point="org.eclipse.ant.core.extraClasspathEntries">
<extraClasspathEntry
library="lib/buildlib.jar">
</extraClasspathEntry>
</extension>
The "SampleBuildLogger" Class creates an instance of "Test". The "Test" class has the following method
BuildListener getBuildListener()
Problem:
********
Invoking the build is producing the following error
java.lang.reflect.InvocationTargetException: java.lang.LinkageError : loader constraints violated when linking org/apache/tools/ant/BuildListener class
Tried as part of debugging:
***************************
Try 1:
If we change the return type of "getBuildListener()" from "BuildListener" to some thing else say "IBuildListener"(custom interface), it goes OK. (But, we need to use org.apache.BuildListener only)
Try 2:
As a Java application(not plugin), trying to create "SampleBuildLogger" instance which in turn will create "Test" having "BuildListener getBuildListener()" method, goes OK. (But, we need to having a plugin. It will use AntRunner to speak to listener )
Guess:
******
We guess that the problem is something to do with the way we access the listener classes in reference to Ant class loader.
Request:
********
Please kindly throw some light on how the problem can be solved?
Thanks in advance
:)
Arun
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