Lakshmi Narayana Garoju [https://community.jboss.org/people/lakshminarayana.garoju] created the discussion "JBOSS running into IO exception" To view the discussion, visit: https://community.jboss.org/message/772450#772450 -------------------------------------------------------------- Hi, could somebody help me with this problem? JBOSS that I am running sometimes crashes. It seems it is losing connection to MySQL. When I observed the thread dump I found below exception. INFO   | jvm 2    | 2012/10/24 10:49:51 | 10:49:51,383 WARN  [JBossManagedConnectionPool] Unable to fill pool INFO   | jvm 2    | 2012/10/24 10:49:51 | org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: INFO   | jvm 2    | 2012/10/24 10:49:51 | INFO   | jvm 2    | 2012/10/24 10:49:51 | ** BEGIN NESTED EXCEPTION ** INFO   | jvm 2    | 2012/10/24 10:49:51 | INFO   | jvm 2    | 2012/10/24 10:49:51 | com.mysql.jdbc.CommunicationsException INFO   | jvm 2    | 2012/10/24 10:49:51 | MESSAGE: Communications link failure due to underlying exception: INFO   | jvm 2    | 2012/10/24 10:49:51 | INFO   | jvm 2    | 2012/10/24 10:49:51 | ** BEGIN NESTED EXCEPTION ** INFO   | jvm 2    | 2012/10/24 10:49:51 | INFO   | jvm 2    | 2012/10/24 10:49:51 | java.io.EOFException INFO   | jvm 2    | 2012/10/24 10:49:51 | MESSAGE: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost. INFO   | jvm 2    | 2012/10/24 10:49:51 | INFO   | jvm 2    | 2012/10/24 10:49:51 | STACKTRACE: INFO   | jvm 2    | 2012/10/24 10:49:51 | INFO   | jvm 2    | 2012/10/24 10:49:51 | java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost. INFO   | jvm 2    | 2012/10/24 10:49:51 |      at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1997) INFO   | jvm 2    | 2012/10/24 10:49:51 |      at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2411) INFO   | jvm 2    | 2012/10/24 10:49:51 |      at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2916) INFO   | jvm 2    | 2012/10/24 10:49:51 |      at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:885) INFO   | jvm 2    | 2012/10/24 10:49:51 |      at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3421) INFO   | jvm 2    | 2012/10/24 10:49:51 |      at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1247) INFO   | jvm 2    | 2012/10/24 10:49:51 |      at com.mysql.jdbc.Connection.createNewIO(Connection.java:2748) INFO   | jvm 2    | 2012/10/24 10:49:51 |      at com.mysql.jdbc.Connection.<init>(Connection.java:1553) INFO   | jvm 2    | 2012/10/24 10:49:51 |      at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285) INFO   | jvm 2    | 2012/10/24 10:49:51 |      at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:172) INFO   | jvm 2    | 2012/10/24 10:49:51 |      at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.createConnectionEventListener(InternalManagedConnectionPool.java:584) INFO   | jvm 2    | 2012/10/24 10:49:51 |      at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.fillToMin(InternalManagedConnectionPool.java:531) INFO   | jvm 2    | 2012/10/24 10:49:51 |      at org.jboss.resource.connectionmanager.PoolFiller.run(PoolFiller.java:74) INFO   | jvm 2    | 2012/10/24 10:49:51 |      at java.lang.Thread.run(Thread.java:619) INFO   | jvm 2    | 2012/10/24 10:49:51 | INFO   | jvm 2    | 2012/10/24 10:49:51 | INFO   | jvm 2    | 2012/10/24 10:49:51 | ** END NESTED EXCEPTION ** Thanks Lakshmi Narayana -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/772450#772450] Start a new discussion in Beginner's Corner at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]