Getting java heap error while running user rename job

Hello,

     While renaming a user through 'Reassign User' menu option in DA6.0(which inturn calls a documentum job), we are getting java heap error. Please find below error trace:-

java.lang.OutOfMemoryError: Java heap space
at java.lang.AbstractStringBuilder. (AbstractStringBuilder.java:44)
at java.lang.StringBuilder. (StringBuilder.java:81)
at com.documentum.fc.client.impl.connection.netwise.StringBuilderManager.getStringBuilder(StringBuilderManager.java:26)
at com.documentum.fc.client.impl.connection.docbase.netwise.NetwiseDocbaseRpcClient.serializeApplyRequest(NetwiseDocbaseRpcClient.java:128)
at com.documentum.fc.client.impl.connection.docbase.netwise.NetwiseDocbaseRpcClient.applyForBool(NetwiseDocbaseRpcClient.java:309)
at com.documentum.fc.client.impl.connection.docbase.DocbaseConnection$1.evaluate(DocbaseConnection.java:850)
at com.documentum.fc.client.impl.connection.docbase.DocbaseConnection.evaluateRpc(DocbaseConnection.java:790)
at com.documentum.fc.client.impl.connection.docbase.DocbaseConnection.applyForBool(DocbaseConnection.java:845)
at com.documentum.fc.client.impl.docbase.DocbaseApi.isCurrent(DocbaseApi.java:174)
at com.documentum.fc.client.impl.objectmanager.PersistentDataManager.isCurrentWithServer(PersistentDataManager.java:154)
at com.documentum.fc.client.impl.objectmanager.PersistentDataManager.getData(PersistentDataManager.java:60)
at com.documentum.fc.client.DfPersistentObject.getNewData(DfPersistentObject.java:730)
at com.documentum.fc.client.DfPersistentObject.refreshData(DfPersistentObject.java:649)
at com.documentum.fc.client.DfPersistentObject.doFetch(DfPersistentObject.java:632)
at com.documentum.fc.client.DfPersistentObject.fetchWithCaching(DfPersistentObject.java:612)
at com.documentum.fc.client.DfACL___PROXY.fetchWithCaching(DfACL___PROXY.java)
at com.documentum.dmcl.impl.FetchHandler.exec(FetchHandler.java:35)
at com.documentum.dmcl.impl.DmclApi.exec(DmclApi.java:96)
at com.documentum.dmcl.impl.DmclApiNativeAdapter.exec(DmclApiNativeAdapter.java:224)
at com.documentum.dmcl.impl.DmclApiNativeAdapter.exec(DmclApiNativeAdapter.java:210)
Exception in thread "main"

Please let us know what can we do to resolve this problem.

Thanks,

-Ashish