第六章 跟着老师写工具类,但是基本都是报HTTP Status 500 – Internal Server Error,实在无法查出原因
来源:6-6 获取Spring上下文工具-ApplicationContextHelper开发

慕村1342571
2018-06-02
代码都一样滴,但就是报下面的错误,得不要想要的结果
HTTP Status 500 – Internal Server Error
Type Exception Report
Message Request processing failed; nested exception is java.lang.NullPointerException
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:986)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:870)
javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)
javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)
@RequestMapping("/validate.json")
@ResponseBody
public JsonData validate(TestVo vo) throws ParamException {
log.info("validate");
SysAclModuleMapper moduleMapper = ApplicationContextHelper.popBean(SysAclModuleMapper.class);
SysAclModule module = moduleMapper.selectByPrimaryKey(1);
log.info(JsonMapper.obj2String(module));
BeanValidator.check(vo);
return JsonData.success("test validate");
}
10回答
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慕村1342571
提问者
2018-07-04
解决了
00 -
慕村1342571
提问者
2018-07-04
如果是正常的返回就没有问题,但是自定义的异常类没有起作用
00 -
慕村1342571
提问者
2018-07-04
HTTP Status 500 – Internal Server Error
Type Exception Report
Message Request processing failed; nested exception is com.mmall.exception.PermissionException: test exception
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is com.mmall.exception.PermissionException: test exception
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)Root Cause
com.mmall.exception.PermissionException: test exception
com.mmall.controller.TestController.hellot3(TestController.java:33)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)Note The full stack trace of the root cause is available in the server logs.
Apache Tomcat/8.5.24
00 -
慕村1342571
提问者
2018-07-04
applicationContext.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<!--占位参数 -->
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" >
<property name="ignoreUnresolvablePlaceholders" value="true" />
<property name="locations">
<list>
<value>classpath:settings.properties</value>
</list>
</property>
</bean>
<!-- 数据源 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
<property name="driverClassName" value="${db.driverClassName}" />
<property name="url" value="${db.url}" />
<property name="username" value="${db.username}" />
<property name="password" value="${db.password}" />
<property name="initialSize" value="3" />
<property name="minIdle" value="3" />
<property name="maxActive" value="20" />
<property name="maxWait" value="60000" />
<property name="filters" value="stat,wall" />
</bean>
<!-- sql会话工厂 、 mybatis的mapper位置 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:mybatis-config.xml" />
<property name="dataSource" ref="dataSource" />
<property name="mapperLocations" value="classpath:mapper/*.xml" />
</bean>
<!-- mybatis的dao操作 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.mmall.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
</bean>
<!-- tx 事务管理-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
<property name="dataSource" ref="dataSource" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
<!-- druid的stat和wall过滤器 -->
<bean id="stat-filter" class="com.alibaba.druid.filter.stat.StatFilter">
<property name="slowSqlMillis" value="3000" />
<property name="logSlowSql" value="true" />
<property name="mergeSql" value="true" />
</bean>
<bean id="wall-filter" class="com.alibaba.druid.wall.WallFilter">
<property name="dbType" value="mysql" />
</bean>
</beans>00 -
慕村1342571
提问者
2018-07-04
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.cdunicom</groupId>
<artifactId>permission</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>permission Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.10010.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
<spring.version>4.3.17.RELEASE</spring.version>
<logback.versiion>1.1.11</logback.versiion>
<slf4j.version>1.7.22</slf4j.version>
<mybatis.version>3.4.1</mybatis.version>
<mybatispring.version>1.3.1</mybatispring.version>
<jackson.version>2.9.5</jackson.version>
<druid.version>1.1.10</druid.version>
<mysql.version>5.1.46</mysql.version>
<lombok.versioin>1.16.18</lombok.versioin>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<!-- Spring Beans -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- Spring Context -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- Spring MVC + Spring WEB-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- Spring JDBC-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<!-- mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>${mybatispring.version}</version>
</dependency>
<!-- druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>${druid.version}</version>
</dependency>
<!-- mysql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<!-- lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.versioin}</version>
</dependency>
<!-- Jackson -->
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-guava</artifactId>
<version>${jackson.version}</version>
</dependency>
<!-- logback -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>${logback.versiion}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.versiion}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<!-- jsp api -->
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>jsp-api</artifactId>
<version>6.0.36</version>
</dependency>
</dependencies>
<build>
<finalName>permission</finalName>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.0.0</version>
</plugin>
<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.20.1</version>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.0</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>00 -
慕村1342571
提问者
2018-07-04
web.xml:
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- Spring beans 配置文件所在目录 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<!-- 指定classpath则从resources目录中查找,若没有指定则从WEB-INF中搜索 -->
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<!-- Spring mvc 配置 -->
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<!-- 拦截所有请求 -->
<!-- / 和 /*的区别:/可以匹配到路径型如/login、/hello等但是匹配不到带后缀型的/*.jsp,
路径型在经过视图解析器后就不会返回到DispatcherServlet;
/*可以匹配到路径型和后缀型所有的地址(/*.html、/*.jsp、/*.js、/*.css);
在处理请求时处理/就可以了不需要处理.jsp的请求,但是在处理编码的时候需要全部过滤
-->
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- Encoding 编码过滤器-->
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- druid servlet -->
<servlet>
<servlet-name>DruidStatServlet</servlet-name>
<servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
<!-- 根据StatViewServlet继承的ResourceServlet中的静态成员变量PARAM_NAME_USERNAME和PARAM_NAME_PASSWORD进行设置 -->
<init-param>
<param-name>loginUsername</param-name>
<param-value>druid</param-value>
</init-param>
<init-param>
<param-name>loginPassword</param-name>
<param-value>druid</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>DruidStatServlet</servlet-name>
<url-pattern>/sys/druid/*</url-pattern> <!-- 增加前缀可以方便对所有sys下的功能连接进行权限校验拦截(比如进行一次登录),不限于druid的请求 -->
</servlet-mapping>
<!-- druid Web filter -->
<filter>
<filter-name>DruidWebStatFilter</filter-name>
<filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
<init-param>
<param-name>exclusions</param-name>
<param-value>*.js,*.css,*.jpg,*.png,*.ico,*.gif,/sys/druid/*</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>DruidWebStatFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>00 -
慕村1342571
提问者
2018-07-04
SpringExceptionResolver:
package com.mmall.common;
import com.mmall.exception.PermissionException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@Slf4j
public class SpringExceptionResolver implements HandlerExceptionResolver {
// 异常处理
@Override
public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
String url = request.getRequestURL().toString();
ModelAndView mv;
String defaultMsg = "System error";
// .json, .page 确定是json请求还是页面请求
// 要求项目中所有请求json数据,都使用.json结尾
if(url.endsWith(".json")){
if (ex instanceof PermissionException){
JsonData result = JsonData.fail(ex.getMessage());
// jsonView和spring-servlet.xml中的 <bean id="jsonView" ...定义对应
mv = new ModelAndView("jsonView", result.toMap());
}else {
log.error("unknow json exception, url:" + url, ex);
JsonData result = JsonData.fail(defaultMsg);
mv = new ModelAndView("jsonView", result.toMap());
}
}else if(url.endsWith(".page")){ // 要求项目中所有请求page页面,都使用.page结尾
log.error("unknow page exception, url:" + url, ex);
JsonData result = JsonData.fail(defaultMsg);
mv = new ModelAndView("exception", result.toMap());
}else{
log.error("unknow exception, url:" + url, ex);
JsonData result = JsonData.fail(defaultMsg);
mv = new ModelAndView("jsonView", result.toMap());
}
return null;
}
}012018-07-04 -
慕村1342571
提问者
2018-07-04
TestController.java:
package com.mmall.controller;
import com.mmall.common.JsonData;
import com.mmall.exception.PermissionException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
@RequestMapping("/test")
@Slf4j
public class TestController {
@RequestMapping("/hellot1")
@ResponseBody
public String hellot1() {
log.info("hellot1 Normal String Test");
return "hello, permission";
}
@RequestMapping("/hellot2.json")
@ResponseBody
public JsonData hellot2() {
log.info("hellot2 JsonData Success Test");
return JsonData.success("hellot2, permission");
}
@RequestMapping("/hellot3.json")
@ResponseBody
public JsonData hellot3() {
log.info("hellot3 JsonData PermissionException Test");
throw new PermissionException("test exception");
}
}00 -
慕村1342571
提问者
2018-07-04
重新写了一次,问题依旧 :spring-servlet.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<context:annotation-config />
<!-- 启动注解驱动的spring mvc 功能 -->
<mvc:annotation-driven />
<!-- 启动包扫描功能 -->
<context:component-scan base-package="com.mmall.controller" />
<context:component-scan base-package="com.mmall.service" />
<!-- RequestMappingHandlerMapping可以实现通过设置RequestMapping找到处理接口,告诉请求可以通过什么代码来处理 -->
<!--<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />-->
<!-- 全局异常处理类 -->
<bean class="com.mmall.common.SpringExceptionResolver" />
<!-- 返回视图渲染,如json数据、jsp页面、PDF文件 -->
<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
<!-- json返回的处理 -->
<bean id="jsonView" class="org.springframework.web.servlet.view.json.MappingJackson2JsonView" />
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
00 -
Jimin
2018-06-02
你好,看你发出来的这个错,是底层框架出现空指针了,怀疑是配置哪里不对,比如spring管理的bean没有被扫描到,mybatis配置错了等等都有可能,你按照这个方向查一下看看,感觉是配置哪里不一致。
如果依旧查不出来,那么把xml相关的配置发出来看一下00
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