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执行sonar时候报错信息如下：

解决办法：

1 查看日志定位具体原因：

进入sonarqube安装目录下面的logs文件夹，找到web.log文件，内容如下：

2019.10.24 14:02:44 ERROR web[AW3acH3vG5436K/TAARN][o.s.s.w.WebServiceEngine] Fail to process request http://127.0.0.1:9000/api/ce/submit?projectKey=fastjson&projectName=fastjson
java.lang.IllegalStateException: Fail to insert data of CE task AW38XDQ0gtH3kEP1Pxgx
        at org.sonar.db.ce.CeTaskInputDao.insert(CeTaskInputDao.java:56)
        at org.sonar.server.ce.queue.ReportSubmitter.submitReport(ReportSubmitter.java:189)
        at org.sonar.server.ce.queue.ReportSubmitter.submit(ReportSubmitter.java:89)
        at org.sonar.server.ce.ws.SubmitAction.handle(SubmitAction.java:121)
        at org.sonar.server.ws.WebServiceEngine.execute(WebServiceEngine.java:110)
        at org.sonar.server.ws.WebServiceFilter.doFilter(WebServiceFilter.java:88)
        at org.sonar.server.platform.web.MasterServletFilter$GodFilterChain.doFilter(MasterServletFilter.java:126)
        at org.sonar.server.platform.web.MasterServletFilter.doFilter(MasterServletFilter.java:95)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.sonar.server.user.UserSessionFilter.doFilter(UserSessionFilter.java:87)
        at org.sonar.server.user.UserSessionFilter.doFilter(UserSessionFilter.java:71)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.sonar.server.platform.web.CacheControlFilter.doFilter(CacheControlFilter.java:76)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.sonar.server.platform.web.SecurityServletFilter.doHttpFilter(SecurityServletFilter.java:76)
        at org.sonar.server.platform.web.SecurityServletFilter.doFilter(SecurityServletFilter.java:48)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.sonar.server.platform.web.RedirectFilter.doFilter(RedirectFilter.java:61)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.sonar.server.platform.web.requestid.RequestIdFilter.doFilter(RequestIdFilter.java:63)
2019.10.24 14:02:44 ERROR web[AW3acH3vG5436K/TAARN][o.s.s.w.WebServiceEngine] Fail to process request http://127.0.0.1:9000/api/ce/submit?projectKey=fastjson&projectName=fastjson
java.lang.IllegalStateException: Fail to insert data of CE task AW38XDQ0gtH3kEP1Pxgx
        at org.sonar.db.ce.CeTaskInputDao.insert(CeTaskInputDao.java:56)
        at org.sonar.server.ce.queue.ReportSubmitter.submitReport(ReportSubmitter.java:189)
        at org.sonar.server.ce.queue.ReportSubmitter.submit(ReportSubmitter.java:89)
        at org.sonar.server.ce.ws.SubmitAction.handle(SubmitAction.java:121)
        at org.sonar.server.ws.WebServiceEngine.execute(WebServiceEngine.java:110)
        at org.sonar.server.ws.WebServiceFilter.doFilter(WebServiceFilter.java:88)
        at org.sonar.server.platform.web.MasterServletFilter$GodFilterChain.doFilter(MasterServletFilter.java:126)
        at org.sonar.server.platform.web.MasterServletFilter.doFilter(MasterServletFilter.java:95)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.sonar.server.user.UserSessionFilter.doFilter(UserSessionFilter.java:87)
        at org.sonar.server.user.UserSessionFilter.doFilter(UserSessionFilter.java:71)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.sonar.server.platform.web.CacheControlFilter.doFilter(CacheControlFilter.java:76)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.sonar.server.platform.web.SecurityServletFilter.doHttpFilter(SecurityServletFilter.java:76)
        at org.sonar.server.platform.web.SecurityServletFilter.doFilter(SecurityServletFilter.java:48)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.sonar.server.platform.web.RedirectFilter.doFilter(RedirectFilter.java:61)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.sonar.server.platform.web.requestid.RequestIdFilter.doFilter(RequestIdFilter.java:63)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.sonar.server.platform.web.RootFilter.doFilter(RootFilter.java:62)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
        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.core.StandardHostValve.invoke(StandardHostValve.java:140)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
        at ch.qos.logback.access.tomcat.LogbackValve.invoke(LogbackValve.java:256)
        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$ConnectionHandler.process(AbstractProtocol.java:868)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java: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: com.mysql.jdbc.PacketTooBigException: Packet for query is too large (7079751 > 4194304). You can change this value on the server by setting the max_allowed_packet' variable.
        at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3681)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2512)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2486)
        at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858)
        at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2079)
        at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2013)
        at com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5104)
        at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1998)
        at org.apache.commons.dbcp2.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:136)
        at org.apache.commons.dbcp2.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:136)
        at org.sonar.db.ce.CeTaskInputDao.insert(CeTaskInputDao.java:53)

根据日志内容提示：You can change this value on the server by setting the max_allowed_packet' variable. 

问题原因：MySQL数据库中写数据的时候超过了单次最大数据量，可通过修改MySQL中max_allowed_packet参数进行解决。

2 MySQL修改配置文件

在etc目录下找到my.cnf文件，[mysqld]下添加如下配置：

max_allowed_packet  = 64M

修改好后，保存文件。

3 重启MySQL和Sonar：

其中，重启MySQL后，进入MySQL执行如下命令可以查看修改后的参数值：

show VARIABLES like '%max_allowed_packet%';

4 重新执行sonar扫描mvn命令，build成功。