Thanks Antonie. Yes that was the issue. I had uninstalled gcj from my system
and it worked fine :). But apparently my JAVA_HOME was fine even before.
Looks like ant had picked up the gnu jdk path from somewhere else.

Regards,
Bharath

On Sun, Mar 7, 2010 at 3:53 PM, Antoine Levy Lambert <antoine@(protected):

> Hello Bharath,
>
> I am intrigued by the class not def found error
> "gnu/classpath/Configuration"
>
> Are you using a GNU JDK ?
>
> You might want to use a Sun JDK. Ant uses normally the JDK pointed to by
> the environment variable JAVA_HOME.
>
> It is possible that there is a bug or limitation of ant and that ant does
> not work with the GNU JDK.
>
> Regards,
>
> Antoine
>
>
> Bharath Vasudevan wrote:
>
>> Hi,
>>
>> I tried building the 6.0.x tomcat source. From the installation looks like
>> we had to execute "ant download" and then "ant".
>>
>> Executing "ant download" completed fine and said build successful. But
>> executing "ant" after it fails with this error:
>>
>> Any idea if some envt variable is messed up ?
>>
>> sudo ant
>> Buildfile: build.xml
>>
>> build-prepare:
>>  [delete] Deleting directory /usr/share/tomcat-trunk/
>> output/build/temp
>>   [mkdir] Created dir: /usr/share/tomcat-trunk/output/build/temp
>>
>> compile:
>>   [javac] Compiling 1058 source files to
>> /usr/share/tomcat-trunk/output/classes
>>
>> BUILD FAILED
>> java.lang.NoClassDefFoundError: gnu/classpath/Configuration
>>     at com.sun.tools.javac.Main.<clinit>(Main.java:66)
>>     at java.lang.Class.forName0(Native Method)
>>     at java.lang.Class.forName (Class.java:186)
>>     at
>>
>> org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.doesModernCompilerExist (CompilerAdapterFactory.java:145)
>>     at
>>
>> org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.getCompiler (CompilerAdapterFactory.java:100)
>>     at org.apache.tools.ant.taskdefs.Javac.compile (Javac.java:1058)
>>     at org.apache.tools.ant.taskdefs.Javac.execute (Javac.java:882)
>>     at
>> org.apache.tools.ant.UnknownElement.execute (UnknownElement.java:288)
>>     at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
>>     at
>>
>> sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
>>     at java.lang.reflect.Method.invoke (Method.java:616)
>>     at
>>
>> org.apache.tools.ant.dispatch.DispatchUtils.execute (DispatchUtils.java:106)
>>     at org.apache.tools.ant.Task.perform (Task.java:348)
>>     at org.apache.tools.ant.Target.execute (Target.java:357)
>>     at org.apache.tools.ant.Target.performTasks (Target.java:385)
>>     at
>> org.apache.tools.ant.Project.executeSortedTargets (Project.java:1337)
>>     at org.apache.tools.ant.Project.executeTarget (Project.java:1306)
>>     at
>>
>> org.apache.tools.ant.helper.DefaultExecutor.executeTargets (DefaultExecutor.java:41)
>>     at org.apache.tools.ant.Project.executeTargets (Project.java:1189)
>>     at org.apache.tools.ant.Main.runBuild (Main.java:758)
>>     at org.apache.tools.ant.Main.startAnt (Main.java:217)
>>     at org.apache.tools.ant.launch.Launcher.run (Launcher.java:257)
>>     at org.apache.tools.ant.launch.Launcher.main (Launcher.java:104)
>> Caused by: java.lang.ClassNotFoundException: gnu.classpath.Configuration
>>     at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
>>     at java.security.AccessController.doPrivileged(Native Method)
>>     at java.net.URLClassLoader.findClass (URLClassLoader.java:205)
>>     at java.lang.ClassLoader.loadClass (ClassLoader.java:323)
>>     at java.lang.ClassLoader.loadClass (ClassLoader.java:268)
>>     at java.lang.ClassLoader.loadClassInternal (ClassLoader.java:336)
>>     ... 23 more
>>
>> Total time: 1 second
>>
>> Regards,
>> Bharath
>>
>>
>>
>
>
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