connection leaks will occur because of code maladies
did you check your code to ensure:
you are closing Statement Handles when you have finished executing the
statement?
you are closing Connection Handles when you have finished DML and DDL
operations with the Database?
?
Martin
______________________________________________
Verzicht und Vertraulichkeitanmerkung
Diese Nachricht ist vertraulich. Sollten Sie nicht der vorgesehene Empfaenger
sein, so bitten wir hoeflich um eine Mitteilung. Jede unbefugte Weiterleitung
oder Fertigung einer Kopie ist unzulaessig. Diese Nachricht dient lediglich dem
Austausch von Informationen und entfaltet keine rechtliche Bindungswirkung.
Aufgrund der leichten Manipulierbarkeit von E-Mails koennen wir keine Haftung
fuer den Inhalt uebernehmen.
> Date: Fri, 6 May 2011 15:42:56 +0530
> Subject: Fwd: DBCP error
> From: dhaval.jais...@via.com
> To: mysql@lists.mysql.com
> CC: shrinivas.devarko...@via.com
>
> Hi All,
>
> We are frequently getting DBCP error. We have seen this error in
> catalina.log & apps log. This issue has started since last 2 -3 days. We
> have checked the application code when this error has occured and assure
> that there is no connection leakage in code. Mysql server is also running
> fine. We have tune memory parameters in mysql, however effectless. Still we
> are getting the same error.
>
> Any suggestion/solution would be appreciated.
>
>
> Mysql server version: 5.0.45
>
> JDBC version: mysql-connector-java-5.1.5-bin.jar
>
> apache Tomcat version: 6.0.16
>
>
> server.xml parameters are as follows::
>
>
> url="jdbc:mysql://hostname:3306/dbname" username="user" password="pass"
> maxActive="40" maxIdle="20" maxWait="5000"
>
>
>
> ERROR:
>
>
> 2011-05-05 16:32:57,666 [ajp-8009-177] ERROR TrainSearchResultCache.java -
> Error retrieving Train Search from DB: s-
>
> org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection,
> pool error Timeout waiting for idle object
>
> at
> org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:104)
>
> at
> org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
>
> at
> com.eos.gds.data.DatabaseManager.getConnection(DatabaseManager.java:73)
>
> at
> com.eos.gds.data.DatabaseManager.getConnection(DatabaseManager.java:60)
>
> ............................................
>
> Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
>
> at
> org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:958)
>
> at
> org.apache.tomcat.dbcp.dbcp.AbandonedObjectPool.borrowObject(AbandonedObjectPool.java:84)
>
> at
> org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:96)
>
> ... 28 more
>
>
> com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications
> link failure
>
> Last packet sent to the server was 24 ms ago.
>
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> Method)
>
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
>
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>
> at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
>
> at
> com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
>
> at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2873)
>
> at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2763)
>
> at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3299)
>
> at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1837)
>
> at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1961)
>
> at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2543)
>
> at
> com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1737)
>
> at
> com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2022)
>
> at
> com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1940)
>
> at
> com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1925)
>
> at
> org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:102)
>
> at
> com.eos.gds.cache.FareQuoteDBCache.storeItinQuotesIntoPresistentCache(FareQuoteDBCache.java:1029)
>
> at
> com.eos.gds.cache.FareQuoteDBCache.processInputQueue(FareQuoteDBCache.java:899)
>
> at
> com.eos.gds.cache.FareQuoteDBCache.access$000(FareQuoteDBCache.java:37)
>
> at
> com.eos.gds.cache.FareQuoteDBCache$1.run(FareQuoteDBCache.java:103)
>
> at java.lang.Thread.run(Thread.java:619)
>
> Caused by: java.net.SocketException: Socket closed
>
> at java.net.SocketInputStream.socketRead0(Native Method)
>
> at java.net.SocketInputStream.read(SocketInputStream.java:129)
>
> at
> com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:113)
>
> at
> com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:160)
>
> at
> com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:188)
>
> at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2329)
>
> at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2774)
>
>
>
>
> --
> Regards,
> Dhaval Jaiswal
>
>
>
>
> --
> Regards,
> Dhaval Jaiswal
