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java.lang.NullPointerException: 	at lab.ConnectionPool.getConnection(ConnectionPool.java:33)	at lab.LocalMySQLCP.pooling(LocalMySQLCP.java:97)	at lab.LocalMySQLCP.openDB(LocalMySQLCP.java:106)	at lab.LocalMySQLCP.(LocalMySQLCP.java:22)	at lab.LocalMySQLCP.main(LocalMySQLCP.java:53)