JAXB in eclipse

[bhargavi kakarala]

Hi,

Are there any samles how to create and run JAXB(Generate schema derived Java classes,Unmarshll XML into Java Objects) in Eclipse IDE.

I was able to generate schema derived classes from command line but now I dont know how to Unmarshall XML doc into JAva Objects.



Thanks in Adavance.

[Peer Reynders]

I'm not quite sure what you are asking - seems that there are two questions:

1. How do I run the JAXB binding compiler from Eclipse?

Include a build.xml file in your project that makes use of Sun's XJCTask ant-task (in jaxb-xjc.jar for JAXB 1.0).

<?xml version="1.0"?>
<project default="generate">
    <path id="classpath">
        <fileset dir="../" includes="lib/*.jar" />
    </path>
    <taskdef name="xjc" classname="com.sun.tools.xjc.XJCTask">
        <classpath refid="classpath" />
    </taskdef>

    <!--Generate JAXB source files-->
    <target name="generate" description="Generate JAXB source files">
        <echo message="Compiling the schema..." />
        <xjc schema="po.xsd" package="primer.po" target="gen-src">
            <produces dir="gen-src/primer.po" includes="**/*.java" />
        </xjc>
        <mkdir dir="classes" />
        <copy todir="classes">
            <fileset dir="gen-src">
                <include name="**/*.properties" />
                <include name="**/bgm.ser" />
            </fileset>
        </copy>
    </target>
</project>

Right-click (the build.xml in your project)
Run As
Ant Build

Note that jaxb-xjc.jar is in the "lib" directory specified by the classpath.


2. How do I unmarshal an XML document to a Java content-tree?

Sun's JWSDP 1.6 samples shows how:

... 
// create a JAXBContext capable of handling classes generated into
// the primer.po package
JAXBContext jc = JAXBContext.newInstance( "primer.po" );
            
// create an Unmarshaller
Unmarshaller u = jc.createUnmarshaller();
          
// unmarshal a po instance document into a tree of Java content
// objects composed of classes from the primer.po package.
PurchaseOrder po = 
    (PurchaseOrder)u.unmarshal( new FileInputStream( "po.xml" ) );            

To run the (JAXB 1.0) examples you will need to add

jaxb\lib\jaxb-api.jar
jaxb\lib\jaxb-impl.jar
jaxb\lib\jaxb-libs.ja
jwsdp-shared\lib\relaxngDatatype.jar
jwsdp-shared\lib\xsdlib.jar

from the JWSDP 1.6 distribution to your project's Java Build Path.

jaxb\lib\jaxb-xjc.jar is only needed for its ant task and to compile the bindings.

JWSDP 1.6 Tutorial: Chapter 2 Using JAXB
[ February 28, 2006: Message edited by: Peer Reynders ]