Want to use Spring Bean in a Servlet using applicationContext or WebApplicationContext. How can i achieve this

1
votes

==================web.xml=================

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<display-name>loginBasic</display-name>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:/spring.xml</param-value>
</context-param>

<listener>
   <listener-class>
        org.springframework.web.context.ContextLoaderListener
   </listener-class>
</listener> 

  <welcome-file-list>
    <welcome-file>siteMendorLogin.jsp</welcome-file>
  </welcome-file-list>

 <!--  <servlet>
        <servlet-name>siteMendorLogin</servlet-name>
        <servlet-class>com.firstApp.servlet.SiteMendorLogin</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>siteMendorLogin</servlet-name>
        <url-pattern>/site</url-pattern>
    </servlet-mapping> -->

  <session-config>
        <session-timeout>15</session-timeout>
  </session-config>

</web-app>

i have my spring.xml placed in src/main/resources folder, hope that location specifies in web.xml is correct

src/main/java --> package com.firstApp.servlet MyServletLogin.java

package com.firstApp.servlet;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.firstApp.spring.tx.model.User;
import com.firstApp.spring.tx.user.UserManager;

@WebServlet("/Site")
public class MyServletLogin extends HttpServlet{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private UserManager userManager;
    Map<String, String> userDetails= new HashMap<String, String>();
    @Override
    public void init(ServletConfig config) throws ServletException {
        WebApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(getServletContext());
        UserManager userManager = (UserManager) ctx.getBean("userManagerImpl");
        userDetails.put("mayank", "mayank");
    }

     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
         //TODO
         //check if cookies with user Credentials are already present 

//       
//
             userManager = (UserManager) ctx.getBean("userManagerImpl");

            List<User> list = userManager.findAllUsers();

         String uid=req.getParameter("userId");
         String uName=req.getParameter("userName"); 
         String userPass=req.getParameter("userPass"); 
         HttpSession session = req.getSession();


         if(userDetails.containsKey(uid) && userDetails.get(uid).equals(userPass)){
             session.setAttribute("userId", uid);
             session.setAttribute("userName", uName);
             Cookie cookie = new Cookie("credential", uid+":"+uName+":"+userPass);
             cookie.setMaxAge(100000);
             cookie.setPath("/callidus/");
             resp.addCookie(cookie);
             resp.sendRedirect("http://localhost:8081/callidus/CookieSent");
         }else{
             session.setAttribute("invalid", "Invalid User Id or password");
             resp.sendRedirect("siteMendorLogin.jsp");
         }

     }



}

siteMendorLogin.jsp looks like this

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>SiteMendor Login</title>
</head>
<body>
    <form action="Site" method="post">  
        <pre>UserId   :  <input type="text" name="userId"/><br/> </pre>
        <pre>UserName  :  <input type="text" name="userName"/><br/> </pre>
        <pre>Password  :  <input type="password" name="userPass"/><br/> </pre> 
        <input type="submit" value="login"/>  
    </form>  

</body>
</html>

I am not sure, if i am doing it the right way, on tomcat start up, getting below error :

SEVERE: Error configuring application listener of class org.springframework.web.context.ContextLoaderListener java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547) at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:532) at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:514) at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:142) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4854) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)

Mar 24, 2017 12:37:52 PM org.apache.catalina.core.StandardContext listenerStart SEVERE: Skipped installing application listeners due to previous error(s) Mar 24, 2017 12:37:52 PM org.apache.catalina.core.StandardContext startInternal SEVERE: Error listenerStart Mar 24, 2017 12:37:52 PM org.apache.catalina.core.StandardContext startInternal SEVERE: Context [/com.myFirstApp] startup failed due to previous errors

Not even getting welcome file(siteMendorLogin.jsp) that i mentioned in web.xml

=======spring.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:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd 
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx.xsd">

    <tx:annotation-driven />

    <context:component-scan base-package="com.firstApp.spring.tx.dao.impl" />
    <context:component-scan base-package="com.firstApp.spring.tx.user.impl" />

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/poc_data" />
        <property name="username" value="root" />
        <property name="password" value="root" />
    </bean>

    <bean id="entityManagerFactory"
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="persistenceUnitName" value="testPU" />
        <property name="dataSource" ref="dataSource" />
    </bean>

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
    </bean>

</beans>

=====pom.xml======

<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.firstApp.spring.tx</groupId>
    <artifactId>com.myFirstApp</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>com.myFirstApp</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <spring.version>3.2.5.RELEASE</spring.version>
        <hibernate.version>4.1.9.Final</hibernate.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>${hibernate.version}</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>${hibernate.version}</version>
        </dependency>

        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.2.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.15</version>
        </dependency>

        <dependency>
    <groupId>jstl</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>
</dependency>

        <dependency>
    <groupId>antlr</groupId>
    <artifactId>antlr</artifactId>
    <version>2.7.7</version>
</dependency>

    </dependencies>
</project>

after adding Maven Dependencies to deployment assembly was able to resolve ContextLoaderListener Error but still issue exist in accessing the service bean in servlet, getting this error : 

javax.servlet.ServletException: Servlet.init() for servlet com.firstApp.servlet.MyServletLogin threw exception
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    java.lang.Thread.run(Thread.java:745)
root cause 
java.lang.NullPointerException
    javax.servlet.GenericServlet.getServletContext(GenericServlet.java:125)
    com.firstApp.servlet.MyServletLogin.init(MyServletLogin.java:38)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    java.lang.Thread.run(Thread.java:745)
2
javaspringjspjpaservlets
If you're using Spring, why are you writing Servlets? Use Spring Web MVC. – Andreas
java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListenerit seems that you are not deploying Spring correctly in your server – RubioRic
can you post your spring.xml? – Hej
@Andreas , Have to redirect to some other application with cookies not sure, if can do it using mvc and how – Mayank Jalotra
I'm still not sure if you are copying the necessary jars to your app lib folder. Tomcat can access your spring.xml file, the problem is that it can not find spring-web jars. – RubioRic

2 Answers

1
votes

This looks to be some missing dependencies in maven pom. Check if you have following dependencies :

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>${spring.version}</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>${spring.version}</version>
</dependency>

Also try by changing param-value to classpath*:spring.xml

Based on the updated error:

The init() method is missing call to super.init(config). Add this call to initialize the servletContext and error should probably go away.

0
votes

Can you change your context-param like the following 1.

 <context-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>/WEB-INF/spring.xml</param-value>
       </context-param>
(or)

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:/spring.xml</param-value>
    </context-param>

2. Right Click on the project->deployment assembly->Add->build path entries->maven dependency

reference: HTTP Status 500 - Servlet.init() for servlet spring-dispatcher threw exception