com.mysql.jdbc.PacketTooBigException: Packet for query is too large (#### > 1024). You can change 。。

max_allowed_packet是字符串缓冲区的最大长度，如果mysql设置过短，插入数据大的时候，会报以下错误

com.jfinal.plugin.activerecord.ActiveRecordException: com.mysql.jdbc.PacketTooBigException: Packet for query is too large (#### > 1024). You can change this value on the server by setting the max_allowed_packet’ variable.
at com.jfinal.plugin.activerecord.Model.save(Model.java:452)
at com.wp.util.ApiUtils.saveData(ApiUtils.java:316)
at com.wp.job.QuartzJobTwo.getText(QuartzJobTwo.java:100)
at com.wp.job.QuartzJobFour.correctGetText(QuartzJobFour.java:115)
at com.wp.index.api.goldten.GoldTenCorrectController.correctGetText(GoldTenCorrectController.java:57)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.jfinal.aop.Invocation.invoke(Invocation.java:73)
at com.jfinal.core.ActionHandler.handle(ActionHandler.java:74)
at com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:73)
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:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
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:803)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)atorg.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)atorg.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)

解决办法：

show VARIABLES like ‘%max_allowed_packet%’; 查看其值大小，默认是1024；
set global max_allowed_packet = 210241024*10;

OK