HTTP Status 500 - Requestprocessing failed; nested exception isorg.mybatis.spring.MyBatisSystemException: nested exception isorg.apache.ibatis.builder.BuilderException: Error evaluating expression'condition.bumen.Bid != null and condition.bumen.Bid !=-1 '. Cause:org.apache.ibatis.ognl.OgnlException: source is null for getProperty(null,"Bid")
  
  
   

   
   
    

  
  
   
type Exception report
message Request processing failed; nestedexception is org.mybatis.spring.MyBatisSystemException: nested exception isorg.apache.ibatis.builder.BuilderException: Error evaluating expression'condition.bumen.Bid != null and condition.bumen.Bid !=-1 '. Cause: org.apache.ibatis.ognl.OgnlException:source is null for getProperty(null, "Bid")
description The server encountered aninternal error that prevented it from fulfilling this request.
exception
org.springframework.web.util.NestedServletException:Request processing failed; nested exception isorg.mybatis.spring.MyBatisSystemException: nested exception isorg.apache.ibatis.builder.BuilderException: Error evaluating expression'condition.bumen.Bid != null and condition.bumen.Bid !=-1 '. Cause: org.apache.ibatis.ognl.OgnlException:source is null for getProperty(null, "Bid")
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:965)
        org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:844)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
        org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
 org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
   org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
root cause
org.mybatis.spring.MyBatisSystemException:nested exception is org.apache.ibatis.builder.BuilderException: Errorevaluating expression 'condition.bumen.Bid != null and condition.bumen.Bid !=-1'. Cause: org.apache.ibatis.ognl.OgnlException: source is null forgetProperty(null, "Bid")
 org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:79)
 org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:447)
        com.sun.proxy.$Proxy7.selectOne(UnknownSource)
        org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:167)
        org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:82)
        org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)
        com.sun.proxy.$Proxy16.getConditionCount(UnknownSource)
        org.HR.biz.impl.perdonnelsBizImpl.getConditionCount(perdonnelsBizImpl.java:85)
        org.HR.controller.perdonnelsController.getAll(perdonnelsController.java:210)
        sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)
        sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        java.lang.reflect.Method.invoke(Method.java:606)
 org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
 org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
 org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:743)
 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:672)
 org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:82)
      org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:919)
       org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:851)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:953)
        org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:844)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
        org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
 org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
   org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)


该题的解决方案为：
1.在实体类中看intager     int ，intager允许为空，int不能为空   （可能会出现的情况   查询全部时出来页面不出数据，必须点击查询  才出数据）
 
2.实体类中没有new 一个实体类
                   Eg: public bumen bumen;  错
                            Publicbumen bumen =new bumen();  对