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No ManagedConnections available within configured blocking timeout ( 30000 [ms] )

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I am running a telecom application on 3 red hat Linux servers. All server have same kind of settings. We have observed that one of the server throwing "No ManagedConnections available within configured blocking timeout ( 30000 [ms] )" when there is bulk INSERT/UPDATE on oracle database. But same amount of Bulk INSERT/UPDATE on oracle database is done without any Exception in rest of the two server.

We are using below jboss connection pool for db connectivity in all servers :


App related detail
Red Hat linux server
JBOSS 4.2.2
JDK 5 Update 22

The Exception occur maximum for 2 minutes but during this time lot of requests will fail. Anyone can give idea what is causing the particular server throwing this Exception while rest of the servers running smoothly.


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