java.lang.AbstractMethodError: Method com/mysql/jdbc/PreparedStatement.isClosed()Z is abstract
-------導包出現重復
刪掉3.4.6的
Method com/mysql/jdbc/PreparedStatement.isClosed()Z is abstract 報錯解決
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java.lang.AbstractMethodError: Method com/mysql/jdbc/PreparedStatement.isClosed()Z is abstract
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Type mismatch: cannot convert from java.sql.PreparedStatement to com.mysql.jdbc.PreparedStatement
【已解決】com.mysql.jdbc.exceptions.jdbc4.CommunicationsExcepti：Communications link failure ----mysql連接報錯