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How to test Servlet on Mockito?

I'm new to mokito, I'm trying to test my servlet who is responsible for registering the user. I'm trying to lock up the HttpRequestServlet but I always get ClassFormException. I can not understand why. How can this be fixed, can you tell? How it is possible to properly test a servlet and to mock HttpServletRequest?
#Mock
private HttpServletRequest request = mock(HttpServletRequest.class); ;
#After
public void verifyRequest(){
verify(request).getParameter(ConstantApp.RegistrationConstantField.GET_FIRST_NAME);
verify(request).getParameter(ConstantApp.RegistrationConstantField.GET_LAST_NAME);
verify(request).getParameter(ConstantApp.RegistrationConstantField.GET_LOGIN);
verify(request).getParameter(ConstantApp.RegistrationConstantField.GET_EMAIL);
verify(request, Mockito.atLeast(2)).getParameter(ConstantApp.RegistrationConstantField.GET_PASSWORD);
verify(request).getParameter(ConstantApp.RegistrationConstantField.GET_CONFIRM_PASSWORD);
}
#Test
public void shouldReturnTrue_WhenWeGetValidField() throws Exception{
when(request.getParameter(ConstantApp.RegistrationConstantField.GET_FIRST_NAME)).thenReturn("Aloha");
when(request.getParameter(ConstantApp.RegistrationConstantField.GET_LAST_NAME)).thenReturn("Dance");
when(request.getParameter(ConstantApp.RegistrationConstantField.GET_LOGIN)).thenReturn("AlohaDance123");
when(request.getParameter(ConstantApp.RegistrationConstantField.GET_EMAIL)).thenReturn("aloha.dance#gmail.com");
when(request.getParameter(ConstantApp.RegistrationConstantField.GET_PASSWORD)).thenReturn("12345678Aa$");
when(request.getParameter(ConstantApp.RegistrationConstantField.GET_CONFIRM_PASSWORD)).thenReturn("12345678Aa$");
Validation validation = new Validation();
Map<String, String> errorMap = validation.validate(new RegistrationInfoImpl(request));
assertTrue(errorMap.isEmpty());
}
My Exception:
java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/servlet/ServletException
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.getDeclaredMethods(Class.java:1975)
at org.mockito.cglib.core.ReflectUtils.addAllMethods(ReflectUtils.java:349)
at org.mockito.cglib.proxy.Enhancer.getMethods(Enhancer.java:427)
at org.mockito.cglib.proxy.Enhancer.generateClass(Enhancer.java:457)
at org.mockito.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
at org.mockito.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:217)
at org.mockito.cglib.proxy.Enhancer.createHelper(Enhancer.java:378)
at org.mockito.cglib.proxy.Enhancer.createClass(Enhancer.java:318)
at org.mockito.internal.creation.cglib.ClassImposterizer.createProxyClass(ClassImposterizer.java:123)
at org.mockito.internal.creation.cglib.ClassImposterizer.imposterise(ClassImposterizer.java:57)
at org.mockito.internal.creation.cglib.ClassImposterizer.imposterise(ClassImposterizer.java:49)
at org.mockito.internal.creation.cglib.CglibMockMaker.createMock(CglibMockMaker.java:24)
at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:33)
at org.mockito.internal.MockitoCore.mock(MockitoCore.java:59)
at org.mockito.Mockito.mock(Mockito.java:1285)
at org.mockito.Mockito.mock(Mockito.java:1163)
at servlet.RegistrationServletTest.<init>(RegistrationServletTest.java:25)

java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/jms/JMSException

im getting the below issue when i run junit test cases, the class is as follow:;
public class RoeSubmissionBeanTest {
RoeSubmissionBean roeSubmissionBean;
ServiceActivation serviceAct = new ServiceActivation();
UpdateTimeResponse updateTimeResponse = new UpdateTimeResponse();
RoEUpdateSuccessfulDT roeUpdateSucces;
MessageIdentification msgID;
ExchangeFaultData faultMessage;
#Before
public void setUp() throws Exception {
//it failes on this line
roeSubmissionBean = Mockito.mock(RoeSubmissionBean.class);
serviceAct = Mockito.mock(ServiceActivation.class);
updateTimeResponse = Mockito.mock(UpdateTimeResponse.class);
roeUpdateSucces = Mockito.mock(RoEUpdateSuccessfulDT.class);
doCallRealMethod().when(roeSubmissionBean).sendMessage(roeUpdateSucces, msgID, faultMessage);
}
and the main methods is
public class RoeSubmissionBean {
private Logger logger = LoggerFactory.getLogger(RoeSubmissionBean.class);
private JMSSender sender = new JMSSender(RoeSubmissionBean.class);
}
i tried some questions here that i have to put dependency in POM, but still getting same error
Error:
java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/jms/JMSException
{ at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.getDeclaredMethods(Class.java:1975)
at org.mockito.cglib.core.ReflectUtils.addAllMethods(ReflectUtils.java:349)
at org.mockito.cglib.proxy.Enhancer.getMethods(Enhancer.java:422)
at org.mockito.cglib.proxy.Enhancer.generateClass(Enhancer.java:457)
}

Exception in thread "main" java.lang.ClassNotFoundException: Main

Below is my code in IntelliJ
package com.example.helloWorld;
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
I got an error as below
Exception in thread "main" java.lang.ClassNotFoundException: Main
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:`enter code here`308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:260)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:116)
Process finished with exit code 1
Kindly advice

Error parsing JSON in Java: ClassNotFoundException

I'm trying to parse a bit of JSON in Java by following this tutorial. Because it mentions nothing about org.apache.commons.io.IOUtils other than it imports it, I figured all it was used for it to convert an InputStream into a String. I have my own code for that, so I omitted it. Here is my code:
import java.io.*;
import java.io.InputStream;
import java.net.*;
import java.util.Scanner;
import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;
public class Net {
static String returnParsedIp() throws UnsupportedEncodingException, MalformedURLException, IOException {
String url = "http://httpbin.org/ip";
URLConnection connection = new URL(url).openConnection();
connection.setRequestProperty("Accept-Charset", "UTF-8");
InputStream response = connection.getInputStream();
String responseString = new Scanner(response,"UTF-8").useDelimiter("\\A").next();
//return responseString;
JSONObject json = (JSONObject) JSONSerializer.toJSON(responseString);
String Ip = json.getString("origin");
return Ip;
}
}
I then call the method from my main class with:
public class DDNS {
public static void main(String[] args) throws Exception {
String Ip = Net.returnParsedIp();
System.out.println(Ip);
}
}
However, it throws the following error:
run:
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at ddns.Net.returnParsedIp(Net.java:19)
at ddns.DDNS.main(DDNS.java:6)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 14 more
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)
Any help is appreciated.

Either you don't have the Apache Commons lang and io JARs in your CLASSPATH or you have the wrong version.
Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException
This is Java 101. You need all the dependencies in the CLASSPATH in order to compile and run.

You have to add the commons-lang jar in yout project

How to work with junit ExpectedException?

I'm trying to work with ExpectedExceptions for JUnit. I tried already this:
public class ExpectedTest {
#Rule
public ExpectedException thrown = ExpectedException.none();
#Test
public void test() {
thrown.expect(NullPointerException.class);
throw new NullPointerException();
}
}
which raises me the following Exception:
java.lang.NoClassDefFoundError: org/hamcrest/TypeSafeMatcher at
java.lang.ClassLoader.defineClass1(Native Method) at
java.lang.ClassLoader.defineClass(ClassLoader.java:800) at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) at
java.net.URLClassLoader.access$100(URLClassLoader.java:71) at
java.net.URLClassLoader$1.run(URLClassLoader.java:361) at
java.net.URLClassLoader$1.run(URLClassLoader.java:355) at
java.security.AccessController.doPrivileged(Native Method) at
java.net.URLClassLoader.findClass(URLClassLoader.java:354) at
java.lang.ClassLoader.loadClass(ClassLoader.java:425) at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at
java.lang.ClassLoader.loadClass(ClassLoader.java:358) at
org.junit.matchers.JUnitMatchers.isThrowable(JUnitMatchers.java:103)
at
org.junit.rules.ExpectedExceptionMatcherBuilder.build(ExpectedExceptionMatcherBuilder.java:27)
at
org.junit.rules.ExpectedException.handleException(ExpectedException.java:198)
at
org.junit.rules.ExpectedException.access$500(ExpectedException.java:85)
at
org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:177)
at org.junit.rules.RunRules.evaluate(RunRules.java:20) 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.lang.ClassNotFoundException:
org.hamcrest.TypeSafeMatcher at
java.net.URLClassLoader$1.run(URLClassLoader.java:366) at
java.net.URLClassLoader$1.run(URLClassLoader.java:355) at
java.security.AccessController.doPrivileged(Native Method) at
java.net.URLClassLoader.findClass(URLClassLoader.java:354) at
java.lang.ClassLoader.loadClass(ClassLoader.java:425) at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at
java.lang.ClassLoader.loadClass(ClassLoader.java:358) ... 33 more
When I do it like this:
public class ExpectedTest {
#Rule
public ExpectedException thrown;
#Before
public void setup() {
thrown = ExpectedException.none();
}
#Test
public void test() {
thrown.expect(NullPointerException.class);
throw new NullPointerException();
}
}
I get a simple NullPointerException! What am I doing wrong?

java.lang.NoClassDefFoundError: org/hamcrest/TypeSafeMatcher suggests that you should make sure that hamcrest-core is on the runtime classpath, or add it if it's missing

You need following dependency
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-core</artifactId>
<version>1.3</version>
<scope>test</scope>
</dependency>

Try this in the test that is supposed to throw the exception:
#Test(expected = NullPointerException.class)