@Override
  protected boolean validateConnection(Connection conn) {
    try {
      return (!conn.isClosed());
    } catch (SQLException e) {
      return false;
    }
  }
Returns true if the connection is not closed.

@param conn Connection object
@return boolean True is the connection is alive.
geode-core/src/main/java/org/apache/geode/internal/datasource/GemFireConnPooledDataSource.java