Re: [platform-ant-dev] Eclipse 2.1.0 AntRunner regression from 2.0.0

[Štěpán Roh <rohs@xxxxxxxxxxxxx>]

You kicked me out of the bottle, thanks :-) I read bugzilla and help and even 
tried what you suggested before I posted to the list, but my brain must have 
been stuck in the bottle, because now I know why it did not work before: I 
tried it to run as runtime application and in that case both libraries are 
compiled in one output folder.

Have you some suggestion how to solve this problem, because it looks like I 
can have only one output folder. Thanks.

Have a nice day.

Stepan Roh

Dne čt 24. duben 2003 18:28 Darin Swanson napsal(a):
> You are doing something wrong but you are not stupid...classloaders give
> me headaches as well :-)
>
> Your AntLogger is getting loaded by the "wrong" class loader so the
> instanceof check fails.  In 2.1, the order of loading classes changed:
> first plugin loaders are queried for a class, and then the URLs on the Ant
> runtime classpath are used to resolve the class.
> See http://bugs.eclipse.org/bugs/show_bug.cgi?id=33664 for all the
> details.
>
> The fix:
> you need separation from the classes of your plugin and the classes in
> your some-ant.jar. Your extra classpath JAR must not be a plug-in library
> and your AntLogger can reference any class available for the plugin but
> plug-in classes must not access the logger.
> This was recommended in 2.0 but it is "enforced" in 2.1.
> It is outlined in the Help provided within Eclipse under the Platform
> Plug-in Developers Guide > Platform Ant support.
>
> HTH
> Darins
>
>
>
>
>
> Štěpán Roh <rohs@xxxxxxxxxxxxx>
> Sent by: platform-ant-dev-admin@xxxxxxxxxxx
> 04/24/03 11:05 AM
> Please respond to platform-ant-dev
>
>
>         To:     platform-ant-dev@xxxxxxxxxxx
>         cc:
>         Subject:        [platform-ant-dev] Eclipse 2.1.0 AntRunner
> regression from 2.0.0
>
>
>
> Hello, I have a problem with AntRunner. I'm embedding Ant in my code using
>
> following construct:
>
> AntRunner ant = new AntRunner();
> ant.addBuildLogger(AntLogger.class.getName());
> ant.setBuildFileLocation(SOME_PATH);
> ant.setArguments("-Dbuild.compiler=" + SOME_COMPILER);
> ant.run(SOME_MONITOR);
>
> AntLogger is a special build logger which integrates Ant logs into the
> rest of
> the system.
>
> Both are in the same plugin, AntRunnerWrapper is in some.jar, AntLogger in
>
> some-ant.jar. Both are mentioned in plugin.xml.
>
> I also defined these extensions:
>
>    <extension
>          point="org.eclipse.ant.core.extraClasspathEntries">
>       <extraClasspathEntry
>             library="some-ant.jar"/>
>    </extension>
>    <extension
>          point="org.eclipse.ant.core.antTasks">
>       <antTask
>             library="some-ant.jar"
>             name="SOME_TASK"
>             class="SOME_CLASS">
>       </antTask>
>    </extension>
>
> When I run the code I get:
>
> org.eclipse.core.runtime.CoreException[1]:
> com.disnetsoft.builder.core.ant.AntLogger which was specified to perform
> logging is not an instance of org.apache.tools.ant.BuildLogger.
>         at
> org.eclipse.ant.internal.core.ant.InternalAntRunner.createLogger(InternalAn
>tRunner.java:659) at
> org.eclipse.ant.internal.core.ant.InternalAntRunner.addBuildListeners(Inter
>nalAntRunner.java:192) at
> org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.j
>ava:522) at
> org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.j
>ava:367) at java.lang.reflect.Method.invoke(Native Method)
>         at org.eclipse.ant.core.AntRunner.run(AntRunner.java:335)
>         at MY_CODE
> --- Nested Exception ---
> java.lang.ClassCastException: com.disnetsoft.builder.core.ant.AntLogger
>         at
> org.eclipse.ant.internal.core.ant.InternalAntRunner.createLogger(InternalAn
>tRunner.java:655) at
> org.eclipse.ant.internal.core.ant.InternalAntRunner.addBuildListeners(Inter
>nalAntRunner.java:192) at
> org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.j
>ava:522) at
> org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.j
>ava:367) at java.lang.reflect.Method.invoke(Native Method)
>         at org.eclipse.ant.core.AntRunner.run(AntRunner.java:335)
>         at MY_CODE
>
> AntLogger is of course instance of org.apache.tools.ant.BuildLogger.
>
> The exact same code worked in Eclipse 2.0.0, but is not working in Eclipse
>
> 2.1.0. If I replace libraries in plugins org.apache.ant and
> org.eclipse.ant.core with those from Eclipse 2.0.0 everything works (which
> is
> not a big surprise).
>
> I tried to debug it (and, trust me, this classpath and reflection hell is
> giving me headaches) and it looks like AntLogger and its interface
> BuildLogger are normally loaded from plugins they belong to, but it is
> then
> casted to BuildLogger from different ClassLoader. This is the relevant
> part
> from InternalAntRunner (as presented in Eclipse 2.1.0):
>
> private BuildLogger createLogger() {
>         if (loggerClassname == null) {
>                  buildLogger= new DefaultLogger();
>          } else if (!"".equals(loggerClassname)) { //$NON-NLS-1$
> // ...snip...
> buildLogger = (BuildLogger)
> (Class.forName(loggerClassname).newInstance());
> // ...snip...
>          }
>          return buildLogger;
> }
>
> I had an impression that BuildLogger in InternalAntRunner is actually
> loaded
> from jar file on Ant's classpath, but now I'm not as sure as I was, but it
> is
> the only reason I can think of.
>
> Am I doing something wrong, am I stupid? Please tell me.
>
> Thanks.
>
> Stepan Roh
> rohs@xxxxxxxxxxxxx
>
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