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https://issues.apache.org/jira/browse/AMQ-5258?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sergiy Barlabanov updated AMQ-5258:
-----------------------------------
Description:
org.apache.activemq.jms.pool.PooledConnectionFactory creates a connection on
startup without giving it back to the pool. So no close() method of
PooledConnection is called and so no decrementReferenceCount is called on
ConnectionPool. So referenceCount never becomes 0.
Later on if an exception occurs and hasExpired of ConnectionPool is set to
true, the connection will not be closed since expiredCheck of ConnectionPool
compares referenceCount with 0 and does close() only if it is 0.
So we have a dead ConnectionPool instance and all usages result in "XXX closed"
errors.
The fix would be to add call to close() just after doing createConnection() in
PooledConnectionFactory#start() to make referenceCount go to 0. Something like
this:
{code:java}
public void start() {
LOG.debug("Staring the PooledConnectionFactory: create on start = {}",
isCreateConnectionOnStartup());
stopped.set(false);
if (isCreateConnectionOnStartup()) {
try {
// warm the pool by creating a connection during startup
createConnection().close(); // <--- makes sure referenceCount
goes to 0
} catch (JMSException e) {
LOG.warn("Create pooled connection during start failed. This
exception will be ignored.", e);
}
}
}
{code}
was:
org.apache.activemq.jms.pool.PooledConnectionFactory creates a connection on
startup without giving it back to the pool. So no close() method of
PooledConnection is called and so no decrementReferenceCount is called on
ConnectionPool. So referenceCount never becomes 0.
Later on if an exception occurs and hasExpired of ConnectionPool is set to
true, the connection will not be closed since expiredCheck of ConnectionPool
compares referenceCount with 0 and does close() only if it is 0.
So we have a dead ConnectionPool instance and all usages result in "XXX closed"
errors.
The fix would be to add call to close() just after doing createConnection() in
PooledConnectionFactory#start() to make referenceCount go to 0. Something like
this:
public void start() {
LOG.debug("Staring the PooledConnectionFactory: create on start = {}",
isCreateConnectionOnStartup());
stopped.set(false);
if (isCreateConnectionOnStartup()) {
try {
// warm the pool by creating a connection during startup
createConnection().close(); // <--- makes sure referenceCount
goes to 0
} catch (JMSException e) {
LOG.warn("Create pooled connection during start failed. This
exception will be ignored.", e);
}
}
}
> Connection reference leak in PooledConnectionFactory leading to expired
> connections stuck in the pool
> -----------------------------------------------------------------------------------------------------
>
> Key: AMQ-5258
> URL: https://issues.apache.org/jira/browse/AMQ-5258
> Project: ActiveMQ
> Issue Type: Bug
> Components: activemq-pool
> Affects Versions: 5.9.1, 5.10.0
> Reporter: Sergiy Barlabanov
>
> org.apache.activemq.jms.pool.PooledConnectionFactory creates a connection on
> startup without giving it back to the pool. So no close() method of
> PooledConnection is called and so no decrementReferenceCount is called on
> ConnectionPool. So referenceCount never becomes 0.
> Later on if an exception occurs and hasExpired of ConnectionPool is set to
> true, the connection will not be closed since expiredCheck of ConnectionPool
> compares referenceCount with 0 and does close() only if it is 0.
> So we have a dead ConnectionPool instance and all usages result in "XXX
> closed" errors.
> The fix would be to add call to close() just after doing createConnection()
> in PooledConnectionFactory#start() to make referenceCount go to 0. Something
> like this:
> {code:java}
> public void start() {
> LOG.debug("Staring the PooledConnectionFactory: create on start =
> {}", isCreateConnectionOnStartup());
> stopped.set(false);
> if (isCreateConnectionOnStartup()) {
> try {
> // warm the pool by creating a connection during startup
> createConnection().close(); // <--- makes sure referenceCount
> goes to 0
> } catch (JMSException e) {
> LOG.warn("Create pooled connection during start failed. This
> exception will be ignored.", e);
> }
> }
> }
> {code}
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