java.sql.SQLException: Unknown system variable ‘query_cache_size‘ 报错处理

zheshihuahua2023-10-09 17:15

java.sql.SQLException: Unknown system variable 'query_cache_size'

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:964) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2680) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2497) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2455) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1369) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at com.mysql.jdbc.ConnectionImpl.loadServerVariables(ConnectionImpl.java:3777) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3240) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2249) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2035) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:790) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) ~ $mysql-connector-java-5.1.41.jar:5.1.41$

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~ $na:1.8.0_181$

原因是mysql-connector-java的版本过低，需要升级版本到8.0.11 ，如下所示：

.<dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

</dependency>

版本升级之后，运行正常。