Hope you must have got the solution by now.
It seems like more than one version of JDK causes problems.

Keep one and remove the others.

A.H

hi,
even i am having the problems in using eclipse(linux platform)
i get the follownig errror...
Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/core/launcher/Main

and in an error window following message is diplayed...
JVM terminated. Error code = 1.
/usr/local/jdk1.3/bin/java
-cp <root>/eclipse/./startup.jar org.eclipse.code.launcher.Main
-os linux
-ws gtk
-arch x86
-showsplash <root>/eclipse/./eclipse -showsplash 600

Can anybody help me what i should do?

regards
pankaj

hi,
even i am having the problems in using eclipse(linux platform)
i get the follownig errror...
Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/core/launcher/Main

and in an error window following message is diplayed...
JVM terminated. Error code = 1.
/usr/local/jdk1.3/bin/java
-cp <root>/eclipse/./startup.jar org.eclipse.code.launcher.Main
-os linux
-ws gtk
-arch x86
-showsplash <root>/eclipse/./eclipse -showsplash 600

Can anybody help me what i should do?

regards
pankaj

Please read Angel_Heart 's reply.
This thing happens when you have multiple Java runtimes installed.
Pls keep one Java Runtime Environment, preferably the latest one.

This thing happens when you have multiple Java
runtimes installed.

I've only the latest one 1.4.2-03 JRE, from Sun J2SDK but I still
get the same error.

PS. I am running Fedora Core 2 Test 1 Linux distribution.

regards

Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/core/launcher/Main

This speaks for the classpath argument's being not correctly set.

As part of your executable command include arguments for VM followed by location of the VM you would like to use as shown below:
eclipse -vm "C:\java\jdk\bin\javaw"

Yes this works, but....

If your SDK is installed under the c:\program files\...., then the program will retrun an error saying that :
A Java Runtime Environment (JRE) or Java Development Kit (JDK) must be available in order to run Eclipse. No Java virtual machine was found after searching the following locations:
C:\program
[OK]

I manually copied my SDK to my root, and now start my eclipse with the following info in a Bat-file:

eclipse.exe -vm C:\j2sdk_nb\j2sdk1.4.2\jre\bin\java.exe

My SDK has been installed in a co-bundle with Netbeans...

Good luck with it... Svens

An other possibility (for Windows):

Write in the command-console "java -jar startup.jar" (the File startup.jar is in the eclipse-directory). Now you can read an exception-message.

There is a path to the Registry, and you can simple change the registry (run "regedit"), to the value given in the message.

Thats it!
My Eclipse 3.0 worked fine with 1.4.2_03 until I installed JBuilder7SE.
I had the same Error-Message. But the trick with the registry worked excellent.

thx

I suggestion you can replace the eclipse 2.0.2 with eclipse 3.0.1 , it can work out the problem.

I already have deleted all JDK in my PC and manually set the JDK, the problem also happen .

So i use eclipse 3.0.1

Hi,

I had the same problem. I had installed eclipse on D:\, then found that D:\program files\ had 2 versions of JRE (1.5 and 1.4). I could not uninstall the 1.5 version.

I found that adding j2sdk1.4.2_05\jre\bin on my Path variable then allowed me to launch Eclipse directly by clicking on the Eclipse.exe. Otherwise I had to start eclipse via the command prompt :

eclipse.exe -vm d:\j2sdk1.4.2_05\jre\bin\java.exe

where I explicitly defined the path of the jre to be used.

When use install JRE 1.3 the following Windows registry key is set
HKEY_LOCAL_MACHINE\Software\JavaSoft\Java Runtime Environment
CurrentVersion=1.3

Change it back to
CurrentVersion=1.4

-------------------------------------------------------------------------
I can duplicate the problem just by changing this value

error run 18 which the solution?