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What is the different between different kind of Java EE projects in Eclipse WTP?
There are:
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For each type of Java application, the IDE provides two types of project templates: Standard templates. Templates in which the IDE controls all source and classpath settings, compilation, running, and debugging. Free-form templates.
For Java EE security there are two main variations of this environment. In the traditional environment security users and their groups are defined and managed externally to the Java EE application.
Application client projects are typically run on networked client systems connected to Java EE (EJB) servers. The point of entry for the application client is a Java main-class, which is simply a Java class that contains a static main method. The class is declared in the manifest file of the client module.
A connector project contains the resources required for a J2EE resource adapter. The wizard allows a set of facets (including the J2EE Connector Architecture (JCA) version) and containing EAR file to be specified.
Quoting the Chapter 5. Projects of the RAD v7, Programming Guide (applies to Eclipse too):
- Application Client Project (J2EE) — Guides the user through creating an empty Application Client project. Includes prompts for the associated EAR project and a list of facets applicable for J2EE Application Client projects.
- Connector Project (J2EE) — Guides the user through creating a J2EE connector project, which includes specifying the associated enterprise application project and a set of facets applicable to it.
- Enterprise Application Project (J2EE) — Creates a new EAR project. This includes options for creating associated Web, EJB, and Application Client projects.
- Utility Project (J2EE) — Assists in the construction of a Java utility library project which is associated with an Enterprise Application project. The product of such a project is a JAR file that is available to the resources within the Enterprise project and is automatically wrapped into the EAR file when it is exported.
This is detailed a few pages later:
Enterprise Application project
Enterprise Application projects contain the resources needed for enterprise applications and can contain references to a combination of Web modules, EJB modules, application client modules, resource adapter modules, utility Java projects, and JAR files.
These relationships can be specified when creating a new Enterprise Application project through the wizard or through the project properties.
For more information on developing J2EE enterprise applications, see Chapter 16, “Develop Web applications using EJBs” on page 719.
J2EE Application Client project
J2EE Application Client projects contain the resources needed for J2EE application client modules. An application client module is used to contain a fully-functioning client Java application (non-Web-based) that connects to and uses the J2EE resources in a J2EE enterprise application and an application server. By holding a reference to the associated enterprise application, it shares information such as the Java Naming and Directory Interface (JNDI) reference to EJBs and data sources.
Connector project
A connector project contains the resources required for a J2EE resource adapter. The wizard allows a set of facets (including the J2EE Connector Architecture (JCA) version) and containing EAR file to be specified.
Short version: they are all wizards to create an Enterprise Application or its parts.
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