Saturday Aug 25, 2007

NetBeans 6 Web Service Designer

NetBeans has introduced a Web Service designer, as you may have seen in Geertjan's blog. In addition to the ability to graphically view and modify operations for implementation first web services (WSDL is generated based on the JAXWS annotations), the web service designer provides the ability to work incrementally starting from a WSDL document. This represents a significant enhancement to the development experience as the WSDL document can become a first class source artifact, while the developer experience remains the same as the Web service designer provides the same implementation
 view. The add operation feature has also been extended to support the direct addition of XML schema. Direct addition of schema elements will perform an on demand generation of JAXB to provide a Java binding.


 

 Having the WSDL generated as part of deployment presents makes it difficult for composite application assembly tools, such as  the NetBeans CASA editor, to take advantage of the abstract WSDL binding capability of the openESB runtime. A composite application provides code composition based on well defined WSDL based interfaces. Since all the modules are deployed together and each WSDL interface is exposed on the service bus, developers can rely on bus endpoints instead of the concrete endpoints exposed in WSDL, thus achieving loose coupling as only the abstract WSDL is needed. The WSDL document can also be modified using the NetBeans WSDL editor to enhance the generated information such as adding documentation.

You will also notice the ability to see sample input and output messages. This is useful when working from Java types to see  how changes to the structure of Java classes will affect the XML messages.

This new feature is worth a look, you can find this in NetBeans 6.  




Friday May 04, 2007

NetBeans REST support

Given that Java One begins next week, I wanted to mention some really interesting technology which is available in  NetBeans 6.0 (milestone 9 build). This preview release provides the ability to generate REST services based on a set of JPA entity beans, which you can also generate using NetBeans. The REST services are annotated using the annotations proposed in JSR-311 (so this will change by the time the JSR is finalized). JSR 311 removes the need for service developers to use the Servlet or JAX-WS and instead provides a runtime and a set of annotations to handle dispatching of requests to your REST enabled resources. This feature also requires installation of the Sun Web Developer Pack which contains Phobos (JavaScript application server), JMaki, and of course the RESTful web services supported.

The wizard determines the set of entity beans available in a project and allows a set of beans to be selected and exposed as resources. In addition to generating the rest resource code, the wizard generates a converter layer which provides the ability to marshal and unmarshal to and from the wire protocol. Currently, the converters are using custom XML to serialize data; however, JSON and ATOM publishing protocol are also being considered. Finally, the converter layer translates object references (such as JPA references) into URI references. All the code generated by NetBeans is freely editable (no guarded blocks) and only relies on the JSR-311 annotations.


Accompanying the wizard is the ability to generate a test client to exercise the generated resources. The test client supports interaction with resource collections as well as individual resources through GET, PUT, POST, and DELETE (depending on the options available via the resources). The test client is generated locall and uses XHR for communicating with the resources, which should mimic most common architectures.

This is best to see in action, check out the video

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