从不同的项目导入xsd，生成java类

Question

I have two projects, A and B. In project AI have common.xsd file where I use cxf-xjc-plugin to generate java classes which work good. Next, I want to reuse this created files and type difinitions from common.xsd in main.xsd file in project B and don't generate classes from project A again, but there is a problem, because I can't include full path in my main.xsd file

 <xs:import namespace="..." schemaLocation="PATH_TO_PROJECT_A/common.xsd" /> 

or you classpath I read that it is possible to use http, but I can't use it. Is there a way to use a maven or something to do this ?

Answer 1

Yes, this is possible, keywords are:

• Separate schema compilation with episodes to avoid generating classes which are already generated
• Catalogs to override schema location including pointing to the schema inside the Maven artifact

Required disclaimer: I'm the author of the maven-jaxb2-plugin which provides these features.

Update:

I tried to use separate schema compilation, but unfortunately I can't undersant it. Should I create separate jar only for xsd file and use it as a dependency ? Now I have dependency to the whole project A which contains generated classes and xsd file

This is enough. You need a JAR with generated classes, XSD files and META-INF/sun-jaxb.episode . All of this is normally generated by default.

Then you can use this JAR as an "episode". XJC will use sun-jaxb.episode resource as binding file automatically, and this file basically says something like "don't generate anything for the schema in namespace X, use the following classes instead." This is one part which allows you to avoid redundant generation of classes. This works mostly , but sometimes XJC still generates a few things - they can be safely deleted.

The other thing is that you want to use schemas from the JAR. This can be done with catalogs and a special entity resolver which is by default delivered by the maven-jaxb2-plugin .

So just use any schemaLocation and then rewrite it in the catalog file:

REWRITE_SYSTEM
 "https://acme.com/foo/a.xsd"
 "maven:com.acme.foo:foo-a!/a.xsd"