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question asked: Nov 27 '14, 8:44 a.m.
question was seen: 31,750 times
last updated: Dec 01 '14, 6:04 a.m.

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Build error - java.lang.ClassNotFoundException: org.apache.tools.ant.launch.Launcher

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Vijayalakshmie K Ekan (7●1●11●15) | asked Nov 27 '14, 8:44 a.m.
While Request Build viaAnt Enterprise Extension  Rationa Build Agent , getting error java.lang.ClassNotFoundException: org.apache.tools.ant.launch.Launcher

I am working with RTCz v 4.0.1 ( RTC on System z) ,
WAS v 8.5 where RTC applications deployed
Build Engine of type Rational Build Agnet
Build Definition - Ant Enterprise Extension Rationa Build Agent

While requesting Build getting :
Exception in thread "main" java.lang.NoClassDefFoundError: org.apache.tools.ant.launch.Launcher
* Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.launch.Launcher
*     at java.net.URLClassLoader.findClass(URLClassLoader.java:434)
*     at java.lang.ClassLoader.loadClass(ClassLoader.java:677)
*     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:358)
*     at java.lang.ClassLoader.loadClass(ClassLoader.java:643)
* Could not find the main class: org.apache.tools.ant.launch.Launcher.  Program will exit.
EXEC end "/rtc4/usr/lpp/jazz/v4.0.1"@"S0W1"

I have set ANT_HOME as /rtc4/usr/lpp/jazz/v4.0.1/buildsystem/buildtoolkit and JAVA_HOME set properly.



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Ryan Ruscett (1.0k●4●13) | answered Nov 27 '14, 9:15 a.m.
Hello,

The fact that it is failing in the main thread. It's failing while loading up and launching ant. This tells me (my opinion) that ANT is not set properly. I see you set ANT_HOME to where you decompressed the ANT files? That may be correct, but have you tried adding  ${ANT_HOME}/bin  (Unix) or  %ANT_HOME%/bin  (Windows) into your PATH? 

JAVA_HOME="xxx/xx/xx/xx"
ANT_HOME="/rtc4/usr/lpp/jazz/v4.0.1/buildsystem/buildtoolkit
PATH="$ANT_HOME/bin:$PATH"

It's not able to find the class org.apache.tools.ant.launch.Launcher which resides in the ant-launcher.jar. You Now, it's very unlikely that the ant-launcher.jar is missing a class. But you could expand it and check if the class if there. If the class is there, it's the classpath that needs adjusting. 

Could try ant --execdebug and see what the output is. Although, I have never used it.

Hope this helps.


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Vijayalakshmie K Ekan (7●1●11●15) | answered Dec 01 '14, 6:04 a.m.
Hi Ryan,

  I could resolve this issue, Thanks for suggestion.

I haven't included PATH, and I am working with System z ,
So i just manually searched on the .jar file correct location and then it had lib and bin.

So gave that path as ANT_HOME, now it is proceeding with compile.

Thanks, Viji

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