Chapter 2. O/X Mapping with JAXB 2.x Java Architecture for XML Binding (JAXB. The Java™ Architecture for XML Binding (JAXB) provides an API and tools that automate JAXB is licensed under a dual license - CDDL and GPL with. In JAXB was released under JSR and Maintenance Besides studying them online you may download the eBook in PDF format!.

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Jaxb 2.0 Ebook

Interested to learn more about JAXB tutorial for Java XML Bind ? Besides studying them online you may download the eBook in PDF. JAXB stands for Java architecture for XML terney.info is used to convert XML to java object and java object to XML. JAXB defines an API for reading and writing. Take a look at how to marshal and unmarshal your Java objects and XML data with JAXB , a useful tool for generating XML schemas from.

This section describes the components and the interactions in the JAXB processing model. The binding is described by an XML-based binding language. Schema generator: Maps a set of existing program elements to a derived schema. The mapping is described by program annotations. Binding runtime framework: Provides unmarshalling reading and marshalling writing operations for accessing, manipulating, and validating XML content using either schema-derived or existing program elements. Compile classes: All of the generated classes, source files, and application code must be compiled. Generate content tree: The unmarshalling process generates a content tree of data objects instantiated from the generated JAXB classes; this content tree represents the structure and content of the source XML documents. Validate optional : The unmarshalling process involves validation of the source XML documents before generating the content tree. Note that if you modify the content tree in Step 6, you can also use the JAXB Validate operation to validate the changes before marshalling the content back to an XML document. Process content: The client application can modify the XML data represented by the Java content tree by using interfaces generated by the binding compiler. Marshal: The processed content tree is marshalled out to one or more XML output documents. The content may be validated before marshalling. Client applications are not required to validate the Java content tree before marshalling. There is also no requirement that the Java content tree be valid with respect to its original schema to marshal it into XML data. More About Validation Validation is the process of verifying that an XML document meets all the constraints expressed in the schema.

The most important are. The following command calls xjc and provides the target directory for the generated classes, the package and the XSD schema file. OK, the operation completed successfully and we now have 3 generated classes in our src directory.

That might be one more than some have expected. So lets have a look at each of them. The classes Author and Book look like expected.

The third and maybe unexpected class is the class ObjectFactory.

It contains factory methods for each generated class or interface. We had a look at xjc and used it to generated the required binding classes for an existing XSD schema definition.

JAXB Examples

What do you think about xjc and the generated code? Please leave me a comment and tell me about it. I think this tool generates very clean code and saves a lot of time. In most of the cases the generated code can be directly added to a project.

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But even if this is not the case, it is much faster to do some refactoring based on the generated code than doing everything myself. Is there a way to generate the classes automatically when schema gets changed like adding more complex-types etc.?

You could probably run it as part of your build process.

But that would be up to you and your build tool. Your email address will not be published.

Save my name, email, and website in this browser for the next time I comment. The binding is described by an XML-based binding language. Schema generator: Maps a set of existing program elements to a derived schema.

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The mapping is described by program annotations. Binding runtime framework: Provides unmarshalling reading and marshalling writing operations for accessing, manipulating, and validating XML content using either schema-derived or existing program elements.

Compile classes: All of the generated classes, source files, and application code must be compiled. Generate content tree: The unmarshalling process generates a content tree of data objects instantiated from the generated JAXB classes; this content tree represents the structure and content of the source XML documents. Validate optional : The unmarshalling process involves validation of the source XML documents before generating the content tree.

Generate your JAXB classes in a second with xjc - Thoughts on Java

Note that if you modify the content tree in Step 6, you can also use the JAXB Validate operation to validate the changes before marshalling the content back to an XML document. Process content: The client application can modify the XML data represented by the Java content tree by using interfaces generated by the binding compiler.

Marshal: The processed content tree is marshalled out to one or more XML output documents.