java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:762)
at serp.util.LookaheadIterator.setNext(LookaheadIterator.java:135)
at serp.util.LookaheadIterator.next(LookaheadIterator.java:60)
at com.solarmetric.kodo.runtime.datacache.query.QueryCacheImpl.notifyChangedClasses(QueryCacheImpl.java:139)
at com.solarmetric.kodo.runtime.datacache.DataCacheStoreManager.commit(DataCacheStoreManager.java:407)
at com.solarmetric.kodo.runtime.PersistenceManagerImpl.endTransaction(PersistenceManagerImpl.java:829)
at com.solarmetric.kodo.runtime.PersistenceManagerImpl.commit(PersistenceManagerImpl.java:509)
at com.ewarna.handlers.storage.TestCaseAccountHandler$3.execute(TestCaseAccountHandler.java:209)
at com.ewarna.managers.JDOCallBackExecutor.execute(JDOCallBackExecutor.java:48)
at com.ewarna.handlers.storage.TestCaseAccountHandler.test202_ModifyAccount(TestCaseAccountHandler.java:215)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:325)

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