NoClassDefFoundError in eclipse when using AST

Question

When trying to use an AST in a java project in eclipse, I get this error message is runtime: Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/core/runtime/IAdaptable

I've tried adding to the build path the core.runtime jar, but that didn't help.

The code fails right on the beginning:

AST ast = AST.newAST(AST.JLS4);

I also tried adding all the jars in my computer but to no avail. any ideas?

stack trace:

Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/core/runtime/IAdaptable
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(Unknown Source)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$000(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(Unknown Source)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$000(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at testRun.main(testRun.java:44)
Caused by: java.lang.ClassNotFoundException: org.eclipse.core.runtime.IAdaptable
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 25 more

Have you done anything to adjust the Target Platform? What's the text of the button where you pressed 'play'? Are you developing a plug-in or a Java Application? Give more specifics. — nitind
– nitind, Commented Dec 21, 2012 at 21:11

Xiao · Accepted Answer · 2013-02-27 11:13:27Z

4

Besides adding org.eclipse.jdt.core_[version_number].jar to your Build Path, you also need to add org.eclipse.equinox.common_[version_number].jar.

answered Feb 27, 2013 at 11:13

Xiao

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3 Comments

Xiao Over a year ago

@Templar because class org.eclipse.core.runtime.IAdaptable is defined in package org.eclipse.equinox.common

someone Over a year ago

@Sean I have both of these jars (org.eclipse.equinox.common-3.6.0.v20100503 and org.eclipse.jdt.core-3.7.0.v_B61), but am still getting the same exception. Does the version number need to be the same for both jars? I also have org.eclipse.core.runtime-3.1.0.jar which has IAdaptable class as well. Even when I remove this jar, it still gives the same error. Any ideas?

Xiao Over a year ago

@ShreyansPagariya I think you should use the compatable version(like keeping all these jars latest. search from mvnrepo); make sure these jars are added to your classpath

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