Error creating object MockHttpServletResponse for unit testing

Question

1. I was trying to write unit test for Servlet using sprint-test using mock object

2. my maven dependency is:

   <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>4.0.3.RELEASE</version>
   </dependency>
   

I want to test just java servlet like below following book PRACTICAL TDD AND ACCEPTANCE TDD FOR JAVA DEVELOPER :

package sample;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginServlet extends HttpServlet {
    private boolean isValid;

    /**
     * 
     */
    private static final long serialVersionUID = 2473252741884321641L;

    @Override
    public void init() throws ServletException {
        super.init();

    }

    @Override
    public void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws IOException {
        String user = req.getParameter("j_username");
        String pass = req.getParameter("j_password");
        if (isValidLogin(user, pass)) {
            resp.sendRedirect("/frontpage");
            req.getSession().setAttribute("username", user);
        } else {
            resp.sendRedirect("/invalidlogin");
        }

    }

    private boolean isValidLogin(String user, String pass) {
        return isValid;
    }

    public void setValid(boolean isValid) {
        this.isValid = isValid;
    }

}

My code is:

    package sample;
    import static org.junit.Assert.assertEquals;
    import org.junit.Test;
    import org.springframework.mock.web.MockHttpServletRequest;
    import org.springframework.mock.web.MockHttpServletResponse;

    public class SprintTestProb {

    @Test
    public void wrongPasswordShouldRedirectToErrorPage() throws Exception {
        MockHttpServletRequest request = new MockHttpServletRequest();
        MockHttpServletResponse response = new MockHttpServletResponse();
        request.addParameter("j_username", "gyanu");
        request.addParameter("j_password", "wrongpassword");
        LoginServlet login = new LoginServlet();
        login.setValid(false);
        login.doPost(request, response);
        assertEquals("/invalidlogin", response.getRedirectedUrl());
    }

}

I got error on line MockHttpServletResponse response = new MockHttpServletResponse(); as follows:

java.lang.ExceptionInInitializerError
    at org.springframework.mock.web.MockHttpServletResponse.<init>(MockHttpServletResponse.java:76)
    at sample.SprintTestProb.wrongPasswordShouldRedirectToErrorPage(SprintTestProb.java:14)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.util.MissingResourceException: Can't find bundle for base name javax.servlet.LocalStrings, locale en_US
    at java.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:1499)
    at java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1322)
    at java.util.ResourceBundle.getBundle(ResourceBundle.java:721)
    at javax.servlet.ServletOutputStream.<clinit>(ServletOutputStream.java:87)
    ... 25 more

Answer 1

I need to replace dependency for javaee-api with javax.selvlet-api as below:

<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>javax.servlet-api</artifactId>
  <version>3.1.0</version>
</dependency>

Answer 2

According to the Spring Framework Reference for Testing you should be using annotations to autowire your mocks. The example in the spring reference:

`

    @WebAppConfiguration
    @ContextConfiguration
    public class WacTests {

    @Autowired WebApplicationContext wac; // cached

    @Autowired MockServletContext servletContext; // cached

    @Autowired MockHttpSession session;

    @Autowired MockHttpServletRequest request;

    @Autowired MockHttpServletResponse response;

    @Autowired ServletWebRequest webRequest;

    //...
}

`

A different example (without annotations) can be found here