TeamPlatform.startup(); throws exception

Why does TeamPlatform.startup(); throw the following exception when i run my java code?What are the source files to be added to solve this?I have already extended the Plain Java Client Libraries.



Exception in thread "main" java.lang.ExceptionInInitializerError
    at sun.misc.Unsafe.ensureClassInitialized(Native Method)
    at sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(Unknown Source)
    at sun.reflect.ReflectionFactory.newFieldAccessor(Unknown Source)
    at java.lang.reflect.Field.acquireFieldAccessor(Unknown Source)
    at java.lang.reflect.Field.getFieldAccessor(Unknown Source)
    at java.lang.reflect.Field.get(Unknown Source)
    at com.ibm.team.repository.common.internal.util.InternalTeamPlatform$1.handleExtensionAdded(InternalTeamPlatform.java:284)
    at com.ibm.team.repository.common.util.ExtensionReader.internalReadElement(ExtensionReader.java:202)
    at com.ibm.team.repository.common.util.ExtensionReader.readRegistry(ExtensionReader.java:350)
    at com.ibm.team.repository.common.util.ExtensionReader.start(ExtensionReader.java:380)
    at com.ibm.team.repository.common.util.ExtensionReader.earlyStart(ExtensionReader.java:127)
    at com.ibm.team.repository.common.internal.util.InternalTeamPlatform.initializeGeneratedPackages(InternalTeamPlatform.java:317)
    at com.ibm.team.repository.common.internal.util.InternalTeamPlatform.start(InternalTeamPlatform.java:108)
    at com.ibm.team.repository.client.TeamPlatform.startup(TeamPlatform.java:50)
    at snippets.SnippetPost2.main(SnippetPost2.java:17)
Caused by: java.lang.NullPointerException
    at org.eclipse.jst.j2ee.common.internal.impl.CommonPackageImpl.initializePackageContents(CommonPackageImpl.java:1460)
    at org.eclipse.jst.j2ee.common.internal.impl.CommonPackageImpl.init(CommonPackageImpl.java:297)
    at org.eclipse.jst.j2ee.common.CommonPackage.<clinit>(CommonPackage.java:243)
    ... 15 more