[CAY-870] Race condition in ClassDescriptorMap

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0
• Fix Version/s: 3.0M2
• Component/s: Core Library
• Environment: Cayenne 3.0 (trunk build sometime after M1)
• Assignee: Andrus Adamchik
• Reporter: Andrus Adamchik
• Created: 03/Oct/07 09:59
• Updated: 09/Nov/08 01:07
• Resolved: 03/Oct/07 10:15

Description

Not sure if 1.2/2.0 is affected...

I am seeing my app getting stuck on startup occasionally. Thread dump shows a few threads stuck in trying to get a class descriptor (see below). This is similar to CAY-845, only happens in a different place. Looks like ClassDescriptorMap lazy initialization can cause such race condition.

at java.util.HashMap.get(HashMap.java:346)
at org.apache.cayenne.reflect.ClassDescriptorMap.getDescriptor(ClassDescriptorMap.java:92)
at org.apache.cayenne.reflect.generic.DataObjectDescriptorFactory.createToManyProperty(DataObjectDescriptorFactory.java:68)
at org.apache.cayenne.reflect.PersistentDescriptorFactory.getDescriptor(PersistentDescriptorFactory.java:96)
at org.apache.cayenne.reflect.generic.DataObjectDescriptorFactory.getDescriptor(DataObjectDescriptorFactory.java:51)
at org.apache.cayenne.reflect.PersistentDescriptorFactory.getDescriptor(PersistentDescriptorFactory.java:51)
at org.apache.cayenne.reflect.ClassDescriptorMap.createDescriptor(ClassDescriptorMap.java:122)
at org.apache.cayenne.reflect.LazyClassDescriptorDecorator.checkDescriptorInitialized(LazyClassDescriptorDecorator.java:49)
at org.apache.cayenne.reflect.LazyClassDescriptorDecorator.getEntity(LazyClassDescriptorDecorator.java:73)
at org.apache.cayenne.access.trans.SelectTranslator.appendQueryColumns(SelectTranslator.java:357)
at org.apache.cayenne.access.trans.SelectTranslator.buildResultColumns(SelectTranslator.java:332)
at org.apache.cayenne.access.trans.SelectTranslator.createSqlString(SelectTranslator.java:107)
at org.apache.cayenne.dba.mysql.MySQLSelectTranslator.createSqlString(MySQLSelectTranslator.java:31)
at org.apache.cayenne.access.trans.QueryAssembler.createStatement(QueryAssembler.java:95)
at org.apache.cayenne.access.jdbc.SelectAction.performAction(SelectAction.java:71)
at org.apache.cayenne.access.DataNodeQueryAction.runQuery(DataNodeQueryAction.java:57)