"Communications link failure" while using MySQL in JBoss EAP
Issue
- Encountering
CommunicationsExceptionandEOFExceptionwhile using a connection in JBoss EAP
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 367,534 milliseconds ago. The last packet sent successfully to the server was 9 milliseconds ago.
...
at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1036)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3427)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3327)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1907)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2030)
...
Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2914)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3337)
...
Environment
- Red Hat JBoss Enterprise Application Platform (EAP)
- 4
- 5
- 6
- MySQL
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