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Re: [platform-ant-dev] loader constraints violated when linking org/apache/tools/ant/BuildListener
|
I don't know if this matches your particular case, but we have seen the
"loader constraints violated" problem when a class with the same fully
qualified name is loaded by two different plugins. Is there any chance
that a class with the name "org/apache/tools/ant/BuildListener" is defined
in two or more plugin jar files? Again, this might not be the case, but
it's one thing to look into. See the following bug report for more
details:
http://dev.eclipse.org/bugs/show_bug.cgi?id=18263
If this doesn't fix it, please enter a bug report against Platform Ant.
"arunchalam P"
<arun.chalam@xxxxxxxxx> To: platform-ant-dev@xxxxxxxxxxx
Sent by: cc:
platform-ant-dev-admin@ Subject: [platform-ant-dev] loader constraints violated when
eclipse.org linking org/apache/tools/ant/BuildListener
08/25/2002 08:41 AM
Please respond to
platform-ant-dev
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 *
*********** *************
|
*********************
***********************************
* 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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