The JDBC realm doesn't use the connection pool you've specified below,
The JDBC realm uses a single connection, never closes it unless an
exception happens.
The connection is defined in the <Realm> section of server.xml
Filip
Gregor Schneider wrote:
Hi list,
we're running Tomcat 5.5 here on Debian Edge, MySQL 5 and we've set up
a connectionpool.
Example of context.xml:
<?xml version="1.0" encoding="UTF-8"?>
<Context>
<Resource
auth="Container"
description="DB Connection for SSO"
name="jdbc/SSODS"
type="javax.sql.DataSource"
factory="org.apache.commons.dbcp.BasicDataSourceFactory"
driverClassName="com.mysql.jdbc.Driver"
username="xxx"
password="xxx"
url="jdbc:mysql://db:3306/apacheSSO"
maxIdle="5"
maxWait="10000"
maxActive="10"
validationQuery="SELECT 1"
testOnBorrow="true"
testWhileIdle="true"
timeBetweenEvictionRunsMillis="10000"
minEvictableIdleTimeMillis="28800"
poolPreparedStatements="true"
removeAbandoned="true"
removeAbandonedTimeout="300"
logAbandoned="false"/>
</Context>
Unfortunately, we always get an exception after 8 hours of inactivity
like
2007-07-09 02:10:16,739 ERROR [TP-Processor7]:
Exception performing authentication
com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException:
Communications link failure during commit(). Transaction resolution
unknown.
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:888)
at com.mysql.jdbc.Connection.commit(Connection.java:2259)
at
org.apache.catalina.realm.JDBCRealm.getPassword(JDBCRealm.java:568)
at
org.apache.catalina.realm.JDBCRealm.authenticate(JDBCRealm.java:399)
at
org.apache.catalina.realm.JDBCRealm.authenticate(JDBCRealm.java:347)
at
org.apache.catalina.authenticator.FormAuthenticator.authenticate(FormAuthenticator.java:257)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:416)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:392)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:199)
at
org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:282)
at
org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697)
at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
That means, the session has timed out, Tomcat tries to re-authenticate
via a JDBC-Realm, but the connection to the database is gone.
It works on the 2nd try, however, I'd like to get rid of that
exception in our logs.
In an article on MySQL-dev it is said, that, to avoid such a scenario,
one shoudl either use connection-pooling, use exception-handling or
shoudl use the MySQL-autoconnect-feature:
http://dev.mysql.com/doc/refman/5.0/en/connector-j-usagenotes-troubleshooting.html#qandaitem-24-4-5-3-4
On the other hand they've issued a warning not to use the
"autoreconnect"-feature since this might be a secirity-issue.
Now my question to you:
How do you handle this when using a connection-pool? Just live with
those exceptions occuring once or twice a day? Catch the exception and
do nothing (not even propagate them to your logs (something I really
dislike))?
Or is their a trick so that I can convince Tomcat *not* to throw this
Exception?
Looking forward to your valued comments!
Gregor
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