jaxb实践

com.sun.tools.apt.main.CommandLine.parse(CommandLine.java:42)官方解释
http://bugs./view_bug.do;jsessionid=e9d905c1f0f588ffffffffa3149dc97319886?bug_id=6510966

 

一下摘自http://blog./2009/03/unable-to-launch-jaxb-schemagen/

we tried to generate a XML schema out of our existing domain model by using the JAXB (2.1, JDK 1.6.0_07) schemagen.

Trying to launch the schemagen as described in the tutorial caused the following error:

C:\temp>schemagen Example.java
An exception has occurred in apt (1.6.0_07). Please file a bug at the
Java Developer Connection (http://java./webapps/bugreport)
after checking the Bug Parade for duplicates. Include your program and
the following diagnostic in your report.  Thank you.
java.lang.NullPointerException
        at com.sun.tools.apt.main.CommandLine.parse(CommandLine.java:42)
        at com.sun.tools.apt.main.Main.compile(Main.java:775)
        at com.sun.tools.apt.Main.processing(Main.java:95)
        at com.sun.tools.apt.Main.process(Main.java:85)
        at com.sun.tools.apt.Main.process(Main.java:67)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.sun.tools.internal.jxc.SchemaGenerator$Runner.main(SchemaGenerator.java:190)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.sun.tools.internal.jxc.SchemaGenerator.run(SchemaGenerator.java:128)
        at com.sun.tools.internal.jxc.SchemaGenerator.run(SchemaGenerator.java:38)
        at com.sun.tools.internal.jxc.SchemaGenerator.main(SchemaGenerator.java:30)

After some researching we determined, that the tools.jar needs to be explicitly added to the classpath:

C:\temp>schemagen -cp "%JAVA_HOME%\lib\tools.jar" Example.java
Note: Writing C:\temp\schema1.xsd
Note: Writing C:\temp\schema2.xsd