jaxb实践

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

 

一下摘自http://blog.claudegex.ch/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:

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1. C:\temp>schemagen Example.java   
2. An exception has occurred in apt (1.6.0_07). Please file a bug at the   
3. Java Developer Connection (http://java.sun.com/webapps/bugreport)   
4. after checking the Bug Parade for duplicates. Include your program and   
5. the following diagnostic in your report.  Thank you.   
6. java.lang.NullPointerException   
7.         at com.sun.tools.apt.main.CommandLine.parse(CommandLine.java:42)   
8.         at com.sun.tools.apt.main.Main.compile(Main.java:775)   
9.         at com.sun.tools.apt.Main.processing(Main.java:95)   
10.         at com.sun.tools.apt.Main.process(Main.java:85)   
11.         at com.sun.tools.apt.Main.process(Main.java:67)   
12.         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)   
13.         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)   
14.         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)   
15.         at java.lang.reflect.Method.invoke(Method.java:597)   
16.         at com.sun.tools.internal.jxc.SchemaGenerator$Runner.main(SchemaGenerator.java:190)   
17.         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)   
18.         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)   
19.         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)   
20.         at java.lang.reflect.Method.invoke(Method.java:597)   
21.         at com.sun.tools.internal.jxc.SchemaGenerator.run(SchemaGenerator.java:128)   
22.         at com.sun.tools.internal.jxc.SchemaGenerator.run(SchemaGenerator.java:38)   
23.         at com.sun.tools.internal.jxc.SchemaGenerator.main(SchemaGenerator.java:30)  

C:\temp>schemagen Example.javaAn exception has occurred in apt (1.6.0_07). Please file a bug at theJava Developer Connection (http://java.sun.com/webapps/bugreport)after checking the Bug Parade for duplicates. Include your program andthe following diagnostic in your report.  Thank you.java.lang.NullPointerExceptionat 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:

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