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# E4 RCP NoClassDefFoundError

By : GBFM
Date : October 25 2020, 09:10 AM
I think the issue was by ths following , The classpath is not used by Eclipse plug-ins. Only the MANIFEST.MF is consulted to find out what other plug-ins and classes to use. Plug-ins can only use classes in other plug-ins.
The MANIFEST.MF of the plug-in that wants to use something in another plug-in must use the Require-Bundle entry to reference the plug-in or use the Import-Package entry to let Eclipse find the package in any installed plug-in.
code :
Export-Package: greg.music.core.common,
greg.music.core.databinding,
greg.music.core.e4util,
greg.music.core.editor,
greg.music.core.expression,
greg.music.core.preferences,
greg.music.core.progress,
greg.music.core.services,
greg.music.core.showin,
greg.music.core.util,
greg.music.core.views,
greg.music.core.xml

Require-Bundle: greg.music.core


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## jython java.lang.NoClassDefFoundError: java.lang.NoClassDefFoundError: org/json/simple/ JSONObject

By : user3362774
Date : March 29 2020, 07:55 AM
it helps some times Jython uses a caching mechanism when starting up, basically going through all jars in your classpath and building wrappers. It's possible that in some cases that particular class is found and wrapped, and in others it isn't; maybe you have a lot of jars and you're hitting some recursion bug or limit.
In any case, I'd make sure that the jar including that specific class is at the beginning of your classpath, explicitly declared (i.e. using -cp C:\path\to\my.jar;%CLASSPATH% ), so that jython will pick it up quickly every time.

## NoClassDefFoundError. How to fix it?

By : Nina Sutton
Date : March 29 2020, 07:55 AM

## NoClassDefFoundError in JSP

By : user3290453
Date : March 29 2020, 07:55 AM
should help you out From your exception stack trace, it's clear that you're missing org/apache/commons/io/IOUtils class in Class Path. So add commons-io-2.4.jar (not necessarily 2.4, it can be any other version) to your WEB-INF/lib directory.
You can find all the JARs in Maven Repository here