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  • java.sql.SQLException: Unknown system variable 'tx_isolation'

    问题原因:mysql版本:8.0.21,mysql-connector-java版本:mysql-connector-java-5.1.7-bin.jar,版本不对齐导致报错。

    解决办法:去 mysql-connector-java 下载与 mysql 对应的版本。

    问题现象:

    java.sql.SQLException: Unknown system variable 'tx_isolation'
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3515)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3447)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1951)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2101)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2548)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2477)
        at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1422)
        at com.mysql.jdbc.ConnectionImpl.getTransactionIsolation(ConnectionImpl.java:3131)
        at com.mchange.v2.c3p0.impl.NewPooledConnection.<init>(NewPooledConnection.java:107)
        at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:198)
        at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)
        at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)
        at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)
        at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
        at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)
        at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
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  • 原文地址:https://www.cnblogs.com/alkq1989/p/13688124.html
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