TeslaCN commented on issue #24243:
URL:
https://github.com/apache/shardingsphere/issues/24243#issuecomment-1519344899
If `proxy-mysql-default-version` GTE `5.7`, the following error would
occurred when using `mysql-connector-java` to connect ShardingSphere-Proxy with
MariaDB backend.
```
Exception in thread "main" java.sql.SQLException: (conn=47) Unknown system
variable 'transaction_isolation'
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3933)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3869)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2524)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2675)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2465)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2439)
at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1365)
at
com.mysql.jdbc.ConnectionImpl.loadServerVariables(ConnectionImpl.java:3767)
at
com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3196)
at
com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2233)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2015)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:768)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
at
java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at
java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
at
java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:403)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:385)
at
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:323)
at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:681)
at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:229)
at
icu.wwj.hello.jdbc.mariadb.MariaClientTest.main(MariaClientTest.java:12)
```
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