#java-ee

Fix: How to decompile a whole Jar file? #programming #computers #fix

How to decompile a whole Jar file?

Does anyone know of a free decompiler that can decompile an entire Jar file instead of a single class? I have a problem with sub classes like name$1.class name$2.class name.class

Answer [by yanchenko]: How to decompile a whole Jar file?

You extract it and then use jad against the dir.

Answer [by VonC]: How to decompile a whole Jar file?

JavaDecompilercan do a…

Fix: Questions every good Java/Java EE Developer should be able to answer? #answer #computers #development

Questions every good Java/Java EE Developer should be able to answer?

I was going through Questions every good .Net developer should be able to answer and was highly impressed with the content and approach of this question, and so in the same spirit, I am asking this question for Java/Java EE Developer.

What questions do you think should a good Java/Java EE programmer be able to answer?

I am…

Answer: java.lang.UnsupportedClassVersionError Unsupported major.minor version 51.0 #fix #development #dev

java.lang.UnsupportedClassVersionError Unsupported major.minor version 51.0

Possible Duplicate: unsupported major .minor version 51.0

I am trying to build an application, but it gives some error. My jdk version is given below:

java version "1.6.0_30" Java(TM) SE Runtime Environment (build 1.6.0_30-b12) Java HotSpot(TM) Client VM (build 20.5-b03, mixed mode, sharing)

Here is my Error Log:

Buildf…

Fixed Maven dependency for Servlet 3.0 API? #dev #it #asnwer

Maven dependency for Servlet 3.0 API?

How can I tell Maven 2 to load the Servlet 3.0 API?

I tried:

<dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>3.0</version> <scope>provided</scope> </dependency>

I use http://repository.jboss.com/maven2/ but what repository would be correct?

Addendum:

It works with a dependency for the entire Java EE 6 API and the…

Fixed What's the difference between JPA and Hibernate? #dev #it #asnwer

What’s the difference between JPA and Hibernate?

I understand that JPA 2 is a specification and Hibernate is a tool for ORM. Also, I understand that Hibernate has more features than JPA 2. But from a practical point of view, what really is the difference?

I have experience using iBatis and now I’m trying to learn either Hibernate or JPA2. I picked up Pro JPA2 book and it keeps referring to “JPA…

Fixed How to upload files to server using JSP/Servlet? #dev #it #asnwer

How to upload files to server using JSP/Servlet?

How can I upload files to server using JSP/Servlet? I tried this:

<form action="upload" method="post"> <input type="text" name="description" /> <input type="file" name="file" /> <input type="submit" /> </form>

However, I only get the file name, not the file content. When I add enctype="multipart/form-data" to the <form>, then request.getParameter…

Fixed Getting the Current Working Directory in Java #dev #it #asnwer

Getting the Current Working Directory in Java

I want to access my current working directory using

String current = new java.io.File( "." ).getCanonicalPath(); System.out.println("Current dir:"+current); String currentDir = System.getProperty("user.dir"); System.out.println("Current dir using System:" +currentDir);

OutPut:

Current dir: C:\WINDOWS\system32 Current dir using System:…

Fixed What is the difference between JSF, Servlet and JSP? #dev #it #asnwer

What is the difference between JSF, Servlet and JSP?

Is JSP = Servlet? And JSF = Pre-build UI based JSP (like asp.net web control)?

Answer: What is the difference between JSF, Servlet and JSP?

See http://www.oracle.com/technetwork/java/faq-137059.html

JSP technology is part of the Java technology family. JSP pages are compiled into servlets and may call JavaBeans components (beans) or…