Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.builder.BuilderException: Error evaluating expression ‘productCondition.shop!=null and productCondition.shop.shopId!=null’. Cause: org.apache.ibatis.ognl.OgnlException: source is null for getProperty(null, “shop”)

描述 服务器遇到一个意外的情况，阻止它完成请求。

例外情况

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.builder.BuilderException: Error evaluating expression ‘productCondition.shop!=null and productCondition.shop.shopId!=null’. Cause: org.apache.ibatis.ognl.OgnlException: source is null for getProperty(null, “shop”)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1013)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897)
javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
根本原因。

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.builder.BuilderException: Error evaluating expression ‘productCondition.shop!=null and productCondition.shop.shopId!=null’. Cause: org.apache.ibatis.ognl.OgnlException: source is null for getProperty(null, “shop”)
org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:77)
org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)
src/test/java单元测试都过了，最后再浏览器中输入url却报这个错误是为什么啊？网上有的说是空指针，我也没看懂。

试着写下面两种清空也不行
第一种情况：

and shop_id = #{productCondition.shop.shopId} and product_category_id = #{productCondition.productCategory.productCategoryId} and product_name like '%${productCondition.productName}%' and enable_status = #{productCondition.enableStatus} 第二种情况： and shop_id = #{productCondition.shop.shopId} and product_category_id = #{productCondition.productCategory.productCategoryId} and product_name like '%${productCondition.productName}%' and enable_status = #{productCondition.enableStatus}

上面这两种where根本不管用，虽然能查出来，但是是把所有的都查出来

粘你的代码就会报错！！！