PrimeFaces vs RichFaces vs IceFaces

In this tutorial we will compare three commonly used libraries which are used on the top of your JSF implementation. Richfaces, IceFaces and Primefaces.

http://www.mastertheboss.com/richfaces/primefaces-vs-richfaces-vs-icefaces

Maven: Generating DDL Scripts from JPA Annotations

Java’s persistence API (JPA) makes object-relational mapping very convenient. Persistence providers like Hibernate can create tables and sequences automatically saving lots of tedious work at development time. However, in production systems automatic schema creation isn’t desired.

In many cases you want to tune the schema a bit, like adding an index for speeding up common access paths, renaming constraints and the like. Additionally, an application should run with as little DB privileges as possible, so it’s quite common that CREATE TABLE or other DDL/SQL statements are simply not permitted.

That’s where the Hibernate3 Maven Plugin can give you a good starting point for your optimizations.

Prerequisites

This article is for you if

• you use JPA annotations on your entities
• your persistence provider is Hibernate 3

Configuration

The plugin wraps an Ant task from Hibernate Tools that analyzes your JPA entities and creates a database schema for them.

Add the following to your pom.xml:

hibernate3-maven-plugin 2.2 hbm2ddl jpaconfiguration Default schema.ddl false true false true

Then adjust your persistence.xml file in src/main/resources/META-INF to set the SQL dialect to use for the DDL statements:

The example above uses HSQL (the embedded database that ships with JBoss), but you’ll likely need a different dialect for your production setup. You can get a list of supported dialects from Hibernate’s API documentation. Also make sure that the persistence unit’s name (Default in this example) matches with the plugin configuration and your persistence.xml.

Now execute the hbm2ddl goal from the command line to create the schema:

mvn hibernate3:hbm2ddl

You will find your schema in target/hibernate3/sql/schema.ddl.

Alternatives

If you want to execute hibernate3::hbm2ddl automatically as part of your normal build, you can tie the hbm2ddl goal to the process-classes phase. There’s an example on the plugin’s homepage.

Further Reading

Traditionally, Maven plugins aren’t documented that well. But since hibernate3-maven-plugin is just a thin wrapper around Hibernate Tools, you can find documentation there.

• Hibernate3 Maven Plugin
• Hibernate Tools Reference Guide
• My original blog posting

There’s a lot more the plugin can do, especially if you’re not using JPA annotations, by the way.

codigo da vinci

public int codigo() {
    return 10+10;
}

Distributed Multitiered Applications

The Java EE platform uses a distributed multitiered application model for enterprise applications. Application logic is divided into components according to function, and the various application components that make up a Java EE application are installed on different machines depending on the tier in the multitiered Java EE environment to which the application component belongs.

Figure 1-1 shows two multitiered Java EE applications divided into the tiers described in the following list. The Java EE application parts shown in Figure 1-1 are presented in Java EE Components.

• Client-tier components run on the client machine.
  
• Web-tier components run on the Java EE server.
  
• Business-tier components run on the Java EE server.
  
• Enterprise information system (EIS)-tier software runs on the EIS server.
  

Although a Java EE application can consist of the three or four tiers shown in Figure 1-1, Java EE multitiered applications are generally considered to be three-tiered applications because they are distributed over three locations: client machines, the Java EE server machine, and the database or legacy machines at the back end. Three-tiered applications that run in this way extend the standard two-tiered client and server model by placing a multithreaded application server between the client application and back-end storage.