Generating Java classes out of XMLSchema.xsd using JAXB

Question

I'm using jaxb to generate java classes out of a xml schema. The schema imports XMLSchema.xsd and its content is used as an element in the document.

If I remove the import and the reference to "xsd:schema" respectively then the binding compiler generates successfully the classes. If I do not then it would produce the following errors, which are the same if I would try to generate Java classes from the XMLSchema.xsd only!

C:\Users\me>"%JAXB%/xjc" -extension -d tmp/uisocketdesc -p uis.jaxb uisocketdesc.xsd -b xml_binding_test.xml -b xml_binding_test_2.xml -b xml_binding_test_3.xml parsing a schema... compiling a schema...

> [ERROR] A class/interface with the same name "uis.jaxb.ComplexType" is already in use. Use a class customization to resolve this conflict. line 612 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Relevant to above error) another "ComplexType" is generated from here. line 440 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] A class/interface with the same name "uis.jaxb.Attribute" is already in use. Use a class customization to resolve this conflict. line 364 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Relevant to above error) another "Attribute" is generated from here. line 1020 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] A class/interface with the same name "uis.jaxb.SimpleType" is already in use. Use a class customization to resolve this conflict. line 2278 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Relevant to above error) another "SimpleType" is generated from here. line 2222 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] A class/interface with the same name "uis.jaxb.Group" is already in use. Use a class customization to resolve this conflict. line 930 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Relevant to above error) another "Group" is generated from here. line 727 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] A class/interface with the same name "uis.jaxb.AttributeGroup" is already in use. Use a class customization to resolve this conflict. line 1062 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Relevant to above error) another "AttributeGroup" is generated from here. line 1026 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] A class/interface with the same name "uis.jaxb.Element" is already in use. Use a class customization to resolve this conflict. line 721 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Relevant to above error) another "Element" is generated from here. line 647 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] Two declarations cause a collision in the ObjectFactory class. line 1020 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Related to above error) This is the other declaration. line 364 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] Two declarations cause a collision in the ObjectFactory class. line 2278 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Related to above error) This is the other declaration. line 2222 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] Two declarations cause a collision in the ObjectFactory class. line 930 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Related to above error) This is the other declaration. line 727 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] Two declarations cause a collision in the ObjectFactory class. line 440 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Related to above error) This is the other declaration. line 612 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] Two declarations cause a collision in the ObjectFactory class. line 1026 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Related to above error) This is the other declaration. line 1062 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] Two declarations cause a collision in the ObjectFactory class. line 647 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Related to above error) This is the other declaration. line 721 of "http://www.w3.org/2001/XMLSchema.xsd"

Failed to produce code.

Answer 1

It looks like your schema is broken. XJC is extremely picky about these things, and can fail on things that other tools let through.

Rather than picking through XJC's errors, I find it easier to run the schema through the AlphaWorks Schema Quality Checker first. This gives a nice, human-readable (well, developer-readable, anyway) output of what's wrong. If it gets through that OK, you'll stand a much better chance of it getting through XJC too.

Answer 2

You can use xjc which comes with JDK1.6. Also you can try XML to Java, refer this article.