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我正在使用JAX-WS（JSR 224's）@WebService和@WebMethod批注创建webservice。尽管我找到了the specification，但我无法找到我在任何地方记录的限制。wsgen限制：什么构造以避免
这里就是我经历了到目前为止使用具备JDK 6 JAX-WS 2.1.6跌跌撞撞：
- 不能使用接口，参数，返回值或对象成员
- 所有类都必须提供无参数默认构造函数
wsgen有什么限制？我应该避免哪些构造？
我也偶然发现了一些奇怪的错误，所有这些似乎类似以下内容，这可能是一个错误：
Note: ap round: 1
Problem encountered during annotation processing;
see stacktrace below for more information.
java.lang.NullPointerException
at com.sun.tools.internal.ws.processor.modeler.annotation.WebServiceVisitor.isLegalType(WebServiceVisitor.java:770)
at com.sun.tools.internal.ws.processor.modeler.annotation.WebServiceVisitor.isLegalMethod(WebServiceVisitor.java:618)
at com.sun.tools.internal.ws.processor.modeler.annotation.WebServiceVisitor.methodsAreLegal(WebServiceVisitor.java:588)
at com.sun.tools.internal.ws.processor.modeler.annotation.WebServiceVisitor.isLegalImplementation(WebServiceVisitor.java:506)
at com.sun.tools.internal.ws.processor.modeler.annotation.WebServiceVisitor.shouldProcessWebService(WebServiceVisitor.java:309)
at com.sun.tools.internal.ws.processor.modeler.annotation.WebServiceVisitor.visitClassDeclaration(WebServiceVisitor.java:112)
at com.sun.tools.apt.mirror.declaration.ClassDeclarationImpl.accept(ClassDeclarationImpl.java:95)
at com.sun.tools.internal.ws.processor.modeler.annotation.WebServiceAP.buildModel(WebServiceAP.java:315)
at com.sun.tools.internal.ws.processor.modeler.annotation.WebServiceAP.process(WebServiceAP.java:256)
at com.sun.mirror.apt.AnnotationProcessors$CompositeAnnotationProcessor.process(AnnotationProcessors.java:60)
at com.sun.tools.apt.comp.Apt.main(Apt.java:454)
at com.sun.tools.apt.main.JavaCompiler.compile(JavaCompiler.java:258)
at com.sun.tools.apt.main.Main.compile(Main.java:1102)
at com.sun.tools.apt.main.Main.compile(Main.java:964)
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 com.sun.tools.internal.ws.wscompile.WsgenTool.buildModel(WsgenTool.java:204)
at com.sun.tools.internal.ws.wscompile.WsgenTool.run(WsgenTool.java:112)
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.ws.Invoker.invoke(Invoker.java:105)
at com.sun.tools.internal.ws.WsGen.main(WsGen.java:41)
error: compilation failed, errors should have been reported