Enterprise portal not starting , error java.lang.NoClassDefFoundError:

hi friends , till mondy my EP module was starting, today it has stopped. i had only applied some new SP7 patches to make my VC work however it resulted in failure of EP.
url i am trying is http://ps3381:50100/irj/portal
i am getting following error
Application error occurred during request processing.
Details: <b>java.lang.NoClassDefFoundError: com/sapportals/common/TracingConsts</b>Exception id: [001125F032ED006D0000002400000F980004211489009873]
please let me know what can be issue. is this the right forum to post in ....
thanks,
rohit

Hi,
please look at the startup logs to see what is the problem.
IF the services are not running then look at usr\sap\<SID>\JC<SYSNO>\work directory for jvm., dev and std* log files.

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java.lang.NoClassDefFoundError: org/jdom/JDOMException
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at com.sun.javaws.Launcher.executeApplet(Unknown Source)
at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
at com.sun.javaws.Launcher.continueLaunch(Unknown Source)
at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
With regards
Nihar
NSHM Knowledge Campus
Head-Librarian, Kolkata
India

To the point, a NoClassDefFoundError simply means that the in the message mentioned class (or at least, the JAR file with the class) is missing in the runtime classpath.
So either it is actually missing, or your code is not using the paths you think it would be used for the classpath, or there are collisions of duplicate different versioned classes in the classpath.

Enterprise portal not starting , error java.lang.NoClassDefFoundError:

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