The JAXB Schema Generator, schemagen, creates a schema file for each namespace referenced in your Java classes. The schema generator can be launched using the appropriate schemagen shell script in the bin directory for your platform. The schema generator processes Java source files only. If your Java sources reference other classes, those sources must be accessible from your system CLASSPATH environment variable, otherwise errors will occur when the schema is generated. There is no way to control the name of the generated schema files.
You can display quick usage instructions by invoking the scripts without any options, or with the -help option. The syntax is as follows:
schemagen [-d path] [java-source-files]
The -d path option specifies the location of the processor- and javac-generated class files.