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Re: Exception in thread “main” java.lang.NoClassDefFoundError Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.Task

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On 01/07/13 08:14, morpheous.sigma@gmail.com wrote:
> I am new to Java, although I have several years experience with other langs (e.g. C/C++ etc). I am trying to run an example program, which uses Ant for its build. I have struggled to get rid of the ClassNotFoundException being thrown for the last four days and despite trying various solutions posted elsewhere on the Internet, I have been unable to solve the problem.
>
> I wonder if anyone on here can help.
>
> Here is the stack trace, (as well as my attempts to solve the problem):

Ubuntu 12.04
apache-ant-1.8.4

Firstly, the class org/apache/tools/ant/Task.class
lives in ../lib/ant.jar

You can use jar -tf <filename> to inspect a jar file.

Setting your classpath to /usr/local/apache-ant-1.9.1/lib won't include 
ant.jar, try adding ant.jar to your classpath

/usr/local/apache-ant-1.9.1/lib/ant.jar

I think you may be able to do *.jar but you'd need to test that.

I mostly use Ant in Eclipse these days where it 'just works' but I 
notice that all the jars in apache-ant-1.8.4/lib are explicitly added to 
the ant classpath in the build configuration window thingy in Eclipse.

A quick DuckDuckGo tells me that opengamma is some kind of open source 
risk analysis thing, so I presume you downloaded a jar file[s] ... is 
the jar on your classpath? If not it needs to be.

Strangely enough, the classpath causes a lot of problems to new users so
you might find this useful

http://docs.oracle.com/javase/tutorial/essential/environment/paths.html

You also need to be careful when running builds from shell scripts as a 
new shell will be created that may not have the same environment setup 
as the calling shell.

<snip>

HTH

lipska

-- 
Lipska the Kat©: Troll hunter, sandbox destroyer
and farscape dreamer of Aeryn Sun

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Exception in thread “main” java.lang.NoClassDefFoundError Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.Task morpheous.sigma@gmail.com - 2013-07-01 00:14 -0700
  Re: Exception in thread “main” java.lang.NoClassDefFoundError Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.Task lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-07-01 09:36 +0100
  Re: Exception in thread “main” java.lang.NoClassDefFoundError Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.Task markspace <markspace@nospam.nospam> - 2013-07-01 09:03 -0700
    Re: Exception in thread “main” java.lang.NoClassDefFoundError Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.Task Lew <lewbloch@gmail.com> - 2013-07-01 17:25 -0700

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