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Archive for May, 2011

[GWT] Reduce the number of permutations

May 31st, 2011 No comments

Here is a tip that I found on other blogs and I think is worth mentioning again. I tried it, it reduced the number of permutations from 15 to 3 only (1 permutation for IE, 1 permutation for the FR locale, 1 permutation for the EN locale). That means a compilation time of 1:05.750s instead of 2:02.828s.

In the module file (blabla.gwt.xml), you need to add this line :

<set-property name="user.agent" value="ie6" />

This of course will produce permutations for Internet Explorer 6 only.
There is also another property to define the locales :

<extend-property name="locale" values="fr" />

So this will generate 2 permutations only : 1 for IE and 1 for the FR locale.

Here is a list of user agents :
http://code.google.com/p/google-web-toolkit/source/browse/trunk/user/src/com/google/gwt/user/UserAgent.gwt.xml

Categories: GWT Tags:

Java puzzlers

May 29th, 2011 No comments

This week I attended the very first and very well organized conference What’s Next ? in Paris and one of the speakers was Neil Gafter, co-author of the book “Java™ Puzzlers: Traps, Pitfalls, and Corner Cases” (2005).
He shared with us 2 or 3 puzzlers which I will share here too :
Question 1) What will the following program print ?

import java.util.Random;

public class Rhymes {
    private static Random rnd = new Random();

    public static void main(String[] args) {
        StringBuffer word = null;
        switch(rnd.nextInt(2)) {
            case 1: word = new StringBuffer('P');
            case 2: word = new StringBuffer('G');
            default: word = new StringBuffer('M');
        }
        word.append('a');
        word.append('i');
        word.append('n');
        System.out.println(word);
    }
}

Read more…

Categories: Java Tags:

Eclipse Dali vs Hibernate Tools

May 8th, 2011 No comments

The process of mapping tables to entities is greatly simplified with tools like Eclipse Dali and Hibernate Tools, both available as Eclipse plugins. It avoids mapping them by hand, which in my opinion is prone to mapping errors and takes more time. And I really do not see why one should map them by hand when great tools like Eclipse Dali and Hibernate Tools are available.
In my book, I describe the use of the Eclipse Dali plugin to automatically generate the entities.
Lately I have also used Hibernate Tools and I have already noticed a few differences between these two tools.
I am going to list some of these differences.
Read more…

Categories: Eclipse, EJB, EJB 3.0, Hibernate, JPA Tags: