waiting to lock <0xc02aadb0> (a java.util.Collections$SynchronizedMap)
Hi,
I'm getting below error in the weblogic server log and threads are getting hung and after some times server stops responding. The application is running on weblogic 8 sp5, j2sdk1.4.2_13, oracle 9i
First error
"ExecuteThread: '0' for queue: 'weblogic.kernel.Default'" daemon prio=5 tid=0x00a68fe8 nid=0xc waiting for monitor entry [0x9daff000..0x9daffc28]
at com.control.persisters.ServiceRequesterPersister.loadServiceRequester(ServiceRequesterPersister.java:98)
- waiting to lock <0xc02aadb0> (a java.util.Collections$SynchronizedMap)
Second error
"ExecuteThread: '2' for queue: 'weblogic.kernel.Default'" daemon prio=5 tid=0x00337c98 nid=0xe waiting for monitor entry [0x9d8fe000..0x9d8ffc28]
at com.common.db.DBConnectionManager$DBConnectionPool.getConnection(Unknown Source)
- waiting to lock <0xc018fe30> (a com.common.db.DBConnectionManager$DBConnectionPool)
at com.common.db.DBConnectionManager.getConnection(Unknown Source)
at com.imac.control.AbstractDBObject.getConnectionByName(AbstractDBObject.java:103)
- locked <0xc0284880> (a com.imac.control.persisters.PageHitPersister)
at com.imac.control.AbstractDBObject.getConnection(AbstractDBObject.java:43)
at com.imac.control.persisters.PageHitPersister.addPage(PageHitPersister.java:70)
For the first error the code I'm using is
privatestaticfinal Map g_requesterCache = Collections.synchronizedMap(new HashMap(128));
synchronized(g_requesterCache){
serviceRequester = (ServiceRequester)g_requesterCache.get(employeeID);
if (null == serviceRequester){
serviceRequester =new ServiceRequester();
}else{
if (log.isDebugEnabled()){
log.debug("retrieved requester from cache");
}
return serviceRequester;
}
}
