Servlet specifications evolved over the period of time. There is lot of improvements has been added to the web deployment descriptor as part of the new versions. It is important for the Java developers to understand the new elements in the web.xml and utilize the added features. In this tutorial I will summarize the sample snippet …
java.lang.ClassNotFoundException: javassist.ClassPath
When you work with Hibernate or Thymeleaf, it is probably that you would get the below exception. It may happen any other projects too if that library has the dependency with javaassist library. I have got this exception when I started developing my first Hello World application using Thymeleaf template framework. The reason for the …
Binary Search Tree Traversal Implemented in Java
Most of the students fresh out of their engineering studies or those who are still studying will have the concept of Binary Search Trees fresh in their minds. But with most of the people who have been out of college for many years now will kind of be having a not so clear idea of …
java.lang.NoClassDefFoundError: org/objectweb/asm/ClassVisitor
When you work on Hibernate, Jersey or any third party API, most of these APIs have the dependency with the asm.jar file. ASM is an all purpose Java bytecode manipulation and analysis framework. This is a common framework used by many of the thrird part frameworks internally, that is the reason many projects have this …
Bean Validation in Java EE 7 – Creating Custom Constraints and Validations
In my previous post I showed how one can make use of the default constraints provided by the Bean Validation API in validatng the model data. Bean Validation API allows the developers to define their own constraints by creating a new annotation and writing the validator which is used to validate the value. In this …
How to Attach JDK source with Eclipse IDE?
This tutorial explains about how to attach JDK source code to your working environment. When you want to look at particulat source code, we can use CTRL+Click on the class name to refer the source code. However, by default developer can not refer JDK’s core Java files. It is referenced as the class files and …
Expected Exception Test in JUnit 4
In my previous article I have written down the sample code for Junit 4 testing using annotations. In this tutorial I would like to write about expected exception testing and Rules which is introduced from JUnit 4.7. JUnit 4 introduced the expected parameter, which makes a test succeed if and only if a certain exception is thrown. In …
JUnit 4 Annotation Example
This tutorial explains the basic usage of JUnit 4 annotations. JUnit is the most popular Unit testing framework most widely used by the Java developers. After the release of Java 5.0 annotations, JUnit 4 has updated to support the annotation programming for the testing methods. Also it introduced @BeforeClass and @AfterClass methods which has to …