We will download and install Java EE 7 SDK which comes with GlassFish Open Source Edition 4 (currently 4.1.1)and then configure eclipse to deploy Java EE applications directly to GlassFish Server. You can download the latest Java EE 7 SDK from http://www.oracle.com/technetwork/java/javaee/downloads/index.html. You can also directly download the latest commercially supported GlassFish Server distribution (currently 3.1.2.2) from the same link.

We can handle exceptions using the try-catch-finally construct or explicitly tell as being handled elsewhere through the use of throws clause in that method signature.

The try-catch-finally block will look as below:

try{

//Some code that can throw IOException

}

catch(Exception ex)

{

//do some workaround.

Java 7 introduces few new features to the exception handling mechanism. We will discuss them quickly here.

Java 7 Multi-Catch Exceptions

With java 7, you can catch multiple exceptions using a single catch block as:

    try {

      File file = new File("filename.txt");

      Scanner sc = new Scanner(file);

      throw new SQLException();

    }

    catch (FileNotFoundException | SQLException e) {

Problem

Given a binary tree, find out if it is a binary search tree or not.

Approach 1

• You can traverse the tree in in-order way, and see if the elements are assending.

  • You may either put the elements into an array and see if the array is sorted in assending way,

Hibernate provide Criteria Queries as an object-oriented alternative to HQL. Criteria Query is used to modify the objects and provide restriction for the objects. Many complex queries in HQL or even SQL may become larger over a period of time and spread over many lines; and will be difficult to update and maintain. We have already seen HQL in http://javajee.com/introduction-to-hibernate-query-language-hql-in-hibernate-43.