Communications link failure due to underlying

Question

  com.mysql.jdbc.CommunicationsException:   Communications   link   failure   due   to   underlying   exception:     
    
  **   BEGIN   NESTED   EXCEPTION   **     
    
  java.io.EOFException   
    
  STACKTRACE:   
    
  java.io.EOFException   
                  at   com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1913)   
                  at   com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2304)   
                  at   com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2803)   
                  at   com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1573)   
                  at   com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1665)   
                  at   com.mysql.jdbc.Connection.execSQL(Connection.java:3118)   
                  at   com.mysql.jdbc.Connection.setAutoCommit(Connection.java:5215)   
                  at   org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.checkTransaction(BaseWrapperManagedConnection.java:425)   
                  at   org.jboss.resource.adapter.jdbc.WrappedConnection.checkTransaction(WrappedConnection.java:766)   
                  at   org.jboss.resource.adapter.jdbc.WrappedConnection.prepareStatement(WrappedConnection.java:214)   
                  at   org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:497)   
    
  ……