Question

我已通过先前的错误修复，并将'mysql-connector'更新为最新版本，甚至更改为其他版本。但是我得到了相同的错误而没有任何更改。（错误似乎表明我正在使用mysql-connector 5.1.39，而不管对pom.xml进行更改并更新项目）都是我遇到的错误。任何帮助将不胜感激。谢谢。

java.sql.SQLException: Unknown system variable 'query_cache_size'
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:963) ~[mysql-connector-java-5.1.39.jar:5.1.39]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3966) ~[mysql-connector-java-5.1.39.jar:5.1.39]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3902) ~[mysql-connector-java-5.1.39.jar:5.1.39]
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2526) ~[mysql-connector-java-5.1.39.jar:5.1.39]
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2673) ~[mysql-connector-java-5.1.39.jar:5.1.39]
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2545) ~[mysql-connector-java-5.1.39.jar:5.1.39]
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2503) ~[mysql-connector-java-5.1.39.jar:5.1.39]
at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1369) ~[mysql-connector-java-5.1.39.jar:5.1.39]
at com.mysql.jdbc.ConnectionImpl.loadServerVariables(ConnectionImpl.java:3833) ~[mysql-connector-java-5.1.39.jar:5.1.39]
at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3283) ~[mysql-connector-java-5.1.39.jar:5.1.39]
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2297) ~[mysql-connector-java-5.1.39.jar:5.1.39]
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2083) ~[mysql-connector-java-5.1.39.jar:5.1.39]

这是我的pom.xml

<dependencies>
<dependency>
        <groupId>javax.validation</groupId>
        <artifactId>validation-api</artifactId>
        <version>1.1.0.Final</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
    <version>1.4.0.RELEASE</version>
</dependency>
    <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.16</version>
</dependency>
<dependency>
    <groupId>org.hibernate.javax.persistence</groupId>
    <artifactId>hibernate-jpa-2.1-api</artifactId>
    <version>1.0.0.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
    <version>4.3.11.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>4.3.11.Final</version>
</dependency>

</dependencies>

虽然我更新pom.xml，但未知的系统变量'query_cache_size'

0 个答案: