[TUSCANY-1179] Race condition due to lazy metada initialization when SDO is shared across threads for read intent

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Java-SDO-beta1
• Component/s: Java SDO Implementation
• Environment: ALL
• Patch Info: Patch Available
• Assignee: Unassigned
• Reporter: Hasan Muhammad
• Created: 15/Mar/07 16:20
• Updated: 19/Sep/10 11:24
• Resolved: 16/Mar/07 17:09

Description

An a DataObject is being shared across multiple threads for read-only purpose ( no modification), due to lazy metadata initialization, we have a race condition which results in different exceptions at different times ( ConcurrentModificationException, NoSuchElementException). The following is one trace;

java.util.ConcurrentModificationException
at org.eclipse.emf.common.util.BasicEList$EIterator.checkModCount(BasicEList.java:1327)
at org.eclipse.emf.common.util.BasicEList$EIterator.next(BasicEList.java:1275)
at org.apache.tuscany.sdo.impl.ClassImpl.initAliasNames(ClassImpl.java:404)
at org.apache.tuscany.sdo.impl.ClassImpl.getProperty(ClassImpl.java:423)
at org.apache.tuscany.sdo.util.DataObjectUtil.get(DataObjectUtil.java:731)
at org.apache.tuscany.sdo.impl.DataObjectImpl.get(DataObjectImpl.java:216)
at org.apache.tuscany.sdo.impl.DataObjectImpl.getDataObject(DataObjectImpl.java:326)
at org.apache.tuscany.sdo.test.CreateDataObjectMultiThreadedTestCase$CreateDataObjectMultiThread.runTest(CreateDataObjectMultiThreadedTestCase.java:67)
at net.sourceforge.groboutils.junit.v1.TestRunnable.run(TestRunnable.java:154)
at java.lang.Thread.run(Thread.java:797)