Why project start time for the first time in your home page occasionally there will be a null pointer exception, but is no longer an error after refresh the page
An error exception as follows, please everyone a great god answer

@ Override
Public List QuerySponsorExecuteTableList (Map Param) {
Logger. The info (" TaskPersonalManager querySponsorExecuteTableList into arguments, "+ +" -- -- -- taskPersonalMapper="+ param taskPersonalMapper);
List SponsorExecuteTableList=taskPersonalMapper. QuerySponsorExecuteTableList (param);
Logger. The info (" TaskPersonalManager, querySponsorExecuteTableList ginseng: "+ sponsorExecuteTableList);
Return sponsorExecuteTableList;
}


The 2019-12-20 16:22:14 | INFO | 100.118.118.11 | acp (acptms - into a system name) | qtp1225358173-18 | com. Sf. TMS. Handle. AllControllerAspect | beforeMethod - & gt; TaskPersonalController. QueryFirstAuditTableData -- -- & gt; Login: 000005 - & gt; Into the ginseng: {limit=20, page=1},
The 2019-12-20 16:22:14 | DEBUG | 100.118.118.11 | acp (acptms - into a system name) | qtp1225358173-60 mon. | c.s.e.com interceptor. SfopenExceptionResolver | Resolving exception from handler [public com.sf.erui.com mon. The response. The response com. Sf. The TMS. Controller. Task. TaskPersonalController. QueryFirstExecuteTableData (Java. Util. Map# # # Error querying the database. Cause: Java. Lang. NullPointerException
# # # Cause: Java. Lang. NullPointerException
The 2019-12-20 16:22:14 | INFO | 100.118.118.11 | acp (acptms - into a system name) | qtp1225358173-18 | com. Sf. TMS. Manager. Task. TaskPersonalManager | TaskPersonalManager, queryAuditList into arguments: {currentUser=000005, limit=20, page=1, auditType=notAudit} - taskPersonalMapper=org. Apache. Ibatis. Binding. MapperProxy @ 7 ceee491
The 2019-12-20 16:22:14 | DEBUG | 100.118.118.11 | acp (acptms - into a system name) | qtp1225358173-60 mon. | c.s.e.com interceptor. SfopenExceptionResolver | Invoking @ ExceptionHandler method: public com.sf.erui.com mon. The response. The response com. Sf. TMS. Handle. GlobalExceptionHandler. ExceptionHandler (javax.mail. Servlet. HTTP. It, javax.mail servlet. HTTP. HttpServletResponse, Java. Lang. Exception)
The 2019-12-20 16:22:14 | ERROR | 100.118.118.11 | acp (acptms - into a system name) | qtp1225358173-60 | com. Sf. TMS. Handle. GlobalExceptionHandler | GlobalExceptionHandler has exceptionHandler===& gt; Nested exception is org. Apache. Ibatis. Exceptions. PersistenceException:
# # # Error querying the database. Cause: Java. Lang. NullPointerException
# # # Cause: Java. Lang. NullPointerException
Org. Mybatis. Spring. MyBatisSystemException: nested exception is org. Apache. Ibatis. Exceptions. PersistenceException:
# # # Error querying the database. Cause: Java. Lang. NullPointerException
# # # Cause: Java. Lang. NullPointerException
The at org. Mybatis. Spring. MyBatisExceptionTranslator. TranslateExceptionIfPossible (MyBatisExceptionTranslator. Java: 75) ~ [mybatis - spring - 1.2.2. Jar: 1.2.2]
The at org. Mybatis. Spring. SqlSessionTemplate $SqlSessionInterceptor. Invoke (SqlSessionTemplate. Java: 371) ~ [mybatis - spring - 1.2.2. Jar: 1.2.2]
At com. Sun. Proxy. $Proxy44. SelectList (Unknown Source) ~ [na: na]
The at org. Mybatis. Spring. SqlSessionTemplate. SelectList (SqlSessionTemplate. Java: 198) ~ [mybatis - spring - 1.2.2. Jar: 1.2.2]
The at org. Apache. Ibatis. Binding. MapperMethod. ExecuteForMany (MapperMethod. Java: 122) ~ [mybatis - 3.3.0. Jar: 3.3.0]
The at org. Apache. Ibatis. Binding. MapperMethod. Execute (MapperMethod. Java: 64) ~ [mybatis - 3.3.0. Jar: 3.3.0]
The at org. Apache. Ibatis. Binding. MapperProxy. Invoke (MapperProxy. Java: 53) ~ [mybatis - 3.3.0. Jar: 3.3.0]
At com. Sun. Proxy. $Proxy123. QuerySponsorExecuteTableList (Unknown Source) ~ [na: na]
At com. Sf. TMS. Manager. Task. Impl. TaskPersonalManagerImpl. QuerySponsorExecuteTableList (TaskPersonalManagerImpl. Java: 186) ~ (classes/: na)
At com. Sf. TMS. Service. Task. Impl. TaskPersonalServiceImpl. QuerySponsorExecuteTableList (TaskPersonalServiceImpl. Java: 206) ~ (classes/: na)
At com. Sf. TMS. Controller. Task. TaskPersonalController. QueryFirstExecuteTableData (TaskPersonalController. Java: 375) ~ (classes/: na)
At com. Sf. TMS. Controller. Task. TaskPersonalController $$FastClassBySpringCGLIB $$344 edfda. Invoke (& lt; Generated>) ~ [classes/: na]
The at org. Springframework. Additional. Proxy. MethodProxy. Invoke (MethodProxy. Java: 204) ~ [spring - core - 4.3.15. The jar: 4.3.15. RELEASE]
At org. Springframework. Aop. Framework. CglibAopProxy $CglibMethodInvocation. InvokeJoinpoint (CglibAopProxy. Java: 738) ~ [spring aop -- 4.3.15. The jar: 4.3.15. RELEASE]
At org. Springframework. Aop. Framework. ReflectiveMethodInvocation. Proceed (ReflectiveMethodInvocation. Java: 157) ~ [spring aop -- 4.3.15. The jar: 4.3.15. RELEASE]
At org. Springframework. Aop) framework) adapter. MethodBeforeAdviceInterceptor. Invoke (MethodBeforeAdviceInterceptor. Java: 52) ~ [spring aop -- 4.3.15. The jar: 4.3.15. RELEASE]
At org. Springframework. Aop. Framework. ReflectiveMethodInvocation. Proceed (ReflectiveMethodInvocation. Java: 179) ~ [spring aop -- 4.3.15. The jar: 4.3.15. RELEASE]
nullnullnullnullnullnullnullnullnullnullnullnullnullnull