spring RuntimeException 无法映射到响应，重新抛出到 HTTP 容器 java.lang.NullPointerException
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时间：2020-09-08 06:09:58 来源:igfitidea点击:
RuntimeException could not be mapped to a response, re-throwing to the HTTP container java.lang.NullPointerException
提问by user2639869
I am trying to validate a user record from my database using Spring Framework, RESTful Web Services and Jersey Implementation.
我正在尝试使用 Spring 框架、RESTful Web 服务和 Jersey 实现从我的数据库中验证用户记录。
I am using MySQL v5.6.0, Eclipse Galileo, Apache tomcat v6.0
我使用的是 MySQL v5.6.0、Eclipse Galileo、Apache tomcat v6.0
UserAccessWS.java
用户访问WS.java
@Path("/user")
@Service
public class UserAccessWS {
@Autowired
private IUserService userService;
private static Logger LOGGER = Logger.getLogger(UserAccessWS.class);
@POST
@Path("/validateUser")
@Produces({ MediaType.APPLICATION_JSON })
public String getValidateUser(@Context HttpServletRequest request,
@FormParam("userName") String userName,
@FormParam("password") String password) throws JSONException {
LOGGER.info("getValidateUser method");
Users users = new Users();
users.setUserName(userName);
users.setPassword(password);
List<Users> userList = new ArrayList<Users>();
userList = userService.validateUser(users);
JSONObject userInfo = new JSONObject();
userInfo.put("authorize", true);
return userInfo.toString();
}
@POST
@Path("/login")
@Produces({ MediaType.APPLICATION_JSON })
public String userLogin(
@FormParam("userName") String userName,
@FormParam("password") String password)
throws Exception
{
LOGGER.info("in UserAccessWS::userLogin()");
JSONObject json = new JSONObject();
JSONArray jsonArr = new JSONArray();
List<Users> userList = new ArrayList<Users>();
userList = userService.userLogin(userName, password);
Null error is being pointed out in this line "userList = userService.userLogin(userName, password);"
在这一行中指出了空错误“userList = userService.userLogin(userName, password);”
//System.out.println(userList);
if (userList.size() == 0)
{
json.put("status", "fail");
}
else
{
json.put("status", "success");
jsonArr.add(userList.get(0));
json.put("data", jsonArr);
}
//System.out.println(jsonArr.get(0).userId);
return json.toString();
}
IUserService.java
用户服务.java
package com.cisco.service.view;
import java.util.List;
import org.json.JSONObject;
import com.cisco.connectivity.rs.mapper.ForgotPassword;
import com.cisco.connectivity.rs.mapper.PasswordChange;
import com.cisco.connectivity.rs.mapper.Registration;
import com.cisco.model.xml.domain.Email;
import com.cisco.model.xml.domain.Users;
public interface IUserService {
public List<Users> validateUser(Users users);
public List<Users> userLogin(String userName, String password);
public String userChangePassword(PasswordChange change);
public List<Email> userForgotPassword(ForgotPassword forgot);
public JSONObject saveData( Registration registration);
public JSONObject check(String userName);
public JSONObject editData( Registration registration);
public JSONObject deleteData( Registration registration);
public JSONObject getData( Registration registration);
public JSONObject getRegistrationFormData(String userName);
}
applicationContext.xml
应用上下文.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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:jee="http://www.springframework.org/schema/jee"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/tx/spring-aop-2.5.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.0.xsd"
default-autowire="byName">
<bean id="applicationProperties"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="ignoreResourceNotFound" value="true" />
<property name="ignoreUnresolvablePlaceholders" value="true" />
<property name="searchSystemEnvironment" value="true" />
</bean>
<context:component-scan base-package="com.cisco" />
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/pooler_mgmt" />
<property name="username" value="root" />
<property name="password" value="" />
</bean>
<bean id="systemProperties" class="java.util.HashMap"></bean>
<bean id="systemEnvironment" class="java.util.HashMap"></bean>
web.xml
网页.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>CiscoPoolerMgmt</display-name>
<description>CiscoPoolerMgmt</description>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:/CiscoPoolerMgmt/config/applicationContext.xml</param-value>
</context-param>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath*:/CiscoPoolerMgmt/config/log4j.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- REST web service -->
<servlet>
<servlet-name>REST_stat_web_service</servlet-name>
<servlet-class>com.sun.jersey.spi.spring.container.servlet.SpringServlet</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.resourceConfigClass</param-name>
<param-value>com.sun.jersey.api.core.PackagesResourceConfig</param-value>
</init-param>
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.cisco.ws</param-value>
</init-param>
<init-param>
<param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>REST_stat_web_service</servlet-name>
<url-pattern>/cisco_BI/rest/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
Error which I am get is:
我得到的错误是：
SEVERE: The RuntimeException could not be mapped to a response, re-throwing to the HTTP container
java.lang.NullPointerException
at com.cisco.ws.UserAccessWS.userLogin(UserAccessWS.java:69)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:149)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:67)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:259)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:133)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:83)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:133)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:71)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:990)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:941)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:932)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:384)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:451)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:632)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
Aug 21, 2013 12:54:21 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet REST_stat_web_service threw exception
java.lang.NullPointerException
at com.cisco.ws.UserAccessWS.userLogin(UserAccessWS.java:69)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:149)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:67)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:259)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:133)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:83)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:133)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:71)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:990)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:941)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:932)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:384)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:451)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:632)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
The database from where it has to validate the details entered by user is NOT empty. It has the records in them. But via this query it always gives a NullPointerException.
用于验证用户输入的详细信息的数据库不是空的。里面有记录。但是通过这个查询，它总是给出一个 NullPointerException。
Please help me out.
请帮帮我。
回答by Prabhakar Manthena
May be this is a late reply. I am suspecting the userServiceit self is null. It is not autowired properly. Because here you mentioned default-autowire="byName"in your applicationContext.xml. I couldn't find the bean named userServicein your applicationContext.xml. I think you need to add the below line in you applicationContext.xml
可能这是一个迟到的回复。我怀疑userService它自己是空的。它没有正确自动装配。因为这里你default-autowire="byName"在你的applicationContext.xml. 我userService在你的applicationContext.xml. 我认为您需要在您中添加以下行applicationContext.xml
<bean id="userService" class="yourIUserServiceImplClass"></bean>
