MyBatisExceptionTranslator loose PersistenceException message

[pavla]

When MyBatis PersistenceException is translated to DataAccessException by MyBatisExceptionTranslator the original message from PersistenceException (ErrorContext message) gets lost. I've implemented my own ExceptionTranslator that preserves the original message - feel free to use it to update your MyBatisExceptionTranslator (my changes are marked with comments).

 public DataAccessException translateExceptionIfPossible(RuntimeException e) {
        // customized extension: store errorMessage from original exception 
        StringBuilder errorMessage = new StringBuilder(e.getMessage()).append("\n");
        if (e instanceof PersistenceException) {
          if (e.getCause() instanceof PersistenceException) {
            e = (PersistenceException) e.getCause();
            // customized extension: add error message from underlying exception
            errorMessage.append(e.getMessage()).append("\n");
          }
          if (e.getCause() instanceof SQLException) {
            this.initExceptionTranslator();
            // customized extension: pass errorMessage 
            return this.exceptionTranslator.translate(errorMessage.toString(), null, (SQLException) e.getCause());
          }
          return new MyBatisSystemException(e);
        } 
        return null;
      }