解决Could not retrieve transation read-only status server

关键字：Could not retrieve transation read-only status server

java.sql.SQLException: Could not retrieve transation read-only status server
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:964)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:897)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:886)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:877)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:873)
	at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3603)
	at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3572)
	at com.mysql.jdbc.PreparedStatement.executeBatchInternal(PreparedStatement.java:1225)
	at com.mysql.jdbc.StatementImpl.executeBatch(StatementImpl.java:958)
	at com.model.BookBatch.saveBatch(BookBatch.java:49)
	at com.control.BookBatchAdd.doGet(BookBatchAdd.java:23)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:625)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:498)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:796)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1372)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.sql.SQLException: Unknown system variable 'tx_read_only'
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:964)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3970)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3906)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2524)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2677)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2545)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2503)
	at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1369)
	at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3597)
	... 29 more

解决办法：

连接数据库书出现以上的错误，换了一些mysql不同版本的jar包就好了，这是mysql数据库与觉得不错版本的兼容问题。

推荐使用jar：

mysql-connector-java-5.0.8-bin.jar

推荐Maven：

      mysql
      mysql-connector-java
      5.0.8

ok！