MySQLValidConnectionChecker swallow a root cause of the exception ----------------------------------------------------------------- Key: JBJCA-1373 URL: https://issues.jboss.org/browse/JBJCA-1373 Project: IronJacamar Issue Type: Bug Components: JDBC Reporter: Lin Gao Assignee: Petr Jurak When java.sql.SQLException is thrown, the root cause should be logged at the same time by MySQLValidConnectionChecker validation. ~~~ WARN [org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory] (default task-1) IJ030027: Destroying connection that is not valid, due to the following exception: com.mysql.jdbc.JDBC4Connection@5d0ae267: java.sql.SQLException: Ping failed: java.lang.reflect.InvocationTargetException at org.jboss.jca.adapters.jdbc.extensions.mysql.MySQLValidConnectionChecker.isValidConnection(MySQLValidConnectionChecker.java:93) at org.jboss.jca.adapters.jdbc.BaseWrapperManagedConnectionFactory.isValidConnection(BaseWrapperManagedConnectionFactory.java:1272) at org.jboss.jca.adapters.jdbc.BaseWrapperManagedConnectionFactory.getInvalidConnections(BaseWrapperManagedConnectionFactory.java:1085) ~~~ However, the current code is : return new SQLException("Ping failed: " + e.toString()); so this should be modified by: return new SQLException("Ping failed: " + e.toString(), e); and logged message with root cause.