Hi Martin, We have modified all timeout,buffersize,pool related parameters from mysql server side. However, still we are getting DBCP errors.
We have practice to close the database connection in finally block of java , in the std practice order of resultset to conn.close.. What would be other things to check and fix these errors? On Fri, May 6, 2011 at 5:54 PM, Martin Gainty <mgai...@hotmail.com> wrote: > 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 > -- Regards, Dhaval Jaiswal
