java.lang.ClassNotFoundException: org.Springframework.Web.Context.ContextLoaderListener

March 16, 2017 Leave a comment

How to solve java.lang.ClassNotFoundException: org.Springframework.Web.Context.ContextLoaderListener.

Firstly we must know root cause :
This error because using Spring MVC framework in Java Web application and configured org.springframework.web.context.ContextLoaderListener as a listener in your deployment descriptor also known as web.xml, but the JAR which contains this class is not available in web application’s classpath. This jar appears in spring-web.jar, if you use maven as build tool so make sure that spring-web dependency exist in pom file.


<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.3.7.RELEASE</version>
</dependency>

Second, right click web project -> Select “Deployment Assembly” -> Click the “Add..” button on the right -> Select “Java Build Path Entries” from the menu of Directive Type and click “Next” -> Select “Maven Dependencies” from the Java Build Path Entries menu -> Click finish.

Please see picture below.

Build path

Thank you.

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Categories: Java, Java and Web Tags: , ,

Struts2 Interceptor Example

February 12, 2017 Leave a comment

In Struts2 interceptor are called one after other one in a configured order for each invocation of an action class. So with interceptor we can do some perform task like logging, validation before action is called.
In this tutorial it shows how to create an own interceptor in Struts2 (Login and Loggin Interceptor). Sumary steps below.

  • Create a class that implements com.opensymphony.xwork2.interceptor.Interceptor interface and override the intercept(ActionInvocation invocation), init, destroy method.

Interceptor class (AuthInterceptor.java)

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

/**
* The Class AuthInterceptor.
*/
public class AuthInterceptor implements Interceptor {

/** The Constant serialVersionUID. */
private static final long serialVersionUID = 1L;

/* (non-Javadoc)
* @see com.opensymphony.xwork2.interceptor.Interceptor#destroy()
*/
public void destroy() {
System.out.println("destroy Auth");
}

/* (non-Javadoc)
* @see com.opensymphony.xwork2.interceptor.Interceptor#init()
*/
public void init() {
System.out.println("init Auth");
}

/* (non-Javadoc)
* @see com.opensymphony.xwork2.interceptor.Interceptor#intercept(com.opensymphony.xwork2.ActionInvocation)
*/
public String intercept(ActionInvocation invoke) throws Exception {
SessionMap sessionMap = (SessionMap) ActionContext.getContext().getSession();
if(sessionMap.get("user") == null){
return Action.LOGIN;
} else {
return invoke.invoke();
}
}
}

Interceptor class (LogInterceptor.java)

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
/**
* The Class LogInterceptor.
*/
public class LogInterceptor implements Interceptor {

/** The Constant serialVersionUID. */
private static final long serialVersionUID = 1L;

/* (non-Javadoc)
* @see com.opensymphony.xwork2.interceptor.Interceptor#destroy()
*/
public void destroy() {
System.out.println("destroy Log");
}

/* (non-Javadoc)
* @see com.opensymphony.xwork2.interceptor.Interceptor#init()
*/
public void init() {
System.out.println("init Log");
}

/* (non-Javadoc)
* @see com.opensymphony.xwork2.interceptor.Interceptor#intercept(com.opensymphony.xwork2.ActionInvocation)
*/
public String intercept(ActionInvocation invoke) throws Exception {
String className = invoke.getAction().getClass().getName();
long startTime = System.currentTimeMillis();
System.out.println("Before calling action: " + className);

String result = invoke.invoke();

long endTime = System.currentTimeMillis();
System.out.println("After calling action: " + className + " Time taken: " + (endTime - startTime) + " ms");
return result;
}
}

If any intercept method in interceptor class decides action should not executed,
it can return a string value and response will be created from global result that same name in struts config file.

  • Configure the interceptor in the struts.xml.
<interceptors>
<interceptor name="authentication" class="strutshelloworld.net.ren.struts2.interceptors.AuthInterceptor">
</interceptor>

<interceptor name="logging" class="strutshelloworld.net.ren.struts2.interceptors.LogInterceptor">
</interceptor>

<interceptor-stack name="authStack">
<interceptor-ref name="authentication" />
<interceptor-ref name="logging" />
<interceptor-ref name="defaultStack" />
</interceptor-stack>
</interceptors>
<default-interceptor-ref name="defaultStack"></default-interceptor-ref>
  • Add global result
<action name="index">
<interceptor-ref name="authStack"></interceptor-ref>
<result type="redirect">/home.html</result>
</action>
  • Add interceptor in action
<action name="home" class="strutshelloworld.net.ren.struts2.actions.UserAction">
<interceptor-ref name="authStack"></interceptor-ref>
<result name="success">/WEB-INF/jsp/Welcome.jsp</result>
</action>

For complete code, you can get it in here.
Fyi, I used project in this post as basis.

Thank you. πŸ™‚

Lesson Is Learned

January 23, 2017 Leave a comment

Job assignment to Tangerang is really disappointed. End up at outsourcing thing, yeah I have to keep positive mindset.

But Lesson is learned,

If better opportunity knock, you have take it do not ignore it.

I will not make same mistake, do not takeΒ ‘Sweet Promise’ seriously.

Kukuh.

Categories: Ren's Notes Tags:

Afternoon

January 4, 2017 Leave a comment

Beautiful afternoon, Alhamdulillah. ^^

Afternoon

Afternoon

Categories: Ren's Notes Tags:

Dawn

January 3, 2017 Leave a comment

I do love this moment, so peaceful. Alhamdulillah. πŸ™‚

Dawn

Categories: Ren's Notes Tags: ,

How To Remove Duplicate Value In Array Without Collection Help

October 27, 2016 Leave a comment

Below how to remove duplicate value in array without collection help


public class RemoveDuplicateManual {

public int[] removeDuplicateNumber(int[] inputArray) {
Arrays.sort(inputArray);
int[] outputArray = new int[inputArray.length];
int previous = inputArray[0];
int observed = 0;
for (int i = 1; i < inputArray.length; i++) {
observed = inputArray[i];
if (previous != observed) {
outputArray[i] = observed;
}
previous = observed;
}

return outputArray;
}
}

πŸ™‚

How To Know Which Port Are Being Used And By What On Windows

September 19, 2016 Leave a comment

Below are steps how to know which port are being used and by what.

  • Open Windows cmd prompt
  • Type netstat -ao, then you will see something like this

Command Prompt

  • Write down PID number. It is process number
  • Open task manager
  • Search PID number that you looking for in task manager

PID Task Manager

πŸ™‚

Categories: Ren's Free Time Tags: ,