webservice发布小问题

Caused by: java.security.PrivilegedActionException: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions
java.util.List is an interface,and JAXB can't handle interfaces.
	this problem is related to the following location:
		at java.util.List
java.util.List does not have a no-arg default constructor.
	this problem is related to the following location:
		at java.util.List

	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.xml.internal.ws.model.AbstractSEIModelImpl.createJAXBContext(AbstractSEIModelImpl.java:124)
	... 11 more
Caused by: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions
java.util.List is an interface,and JAXB can't handle interfaces.
	this problem is related to the following location:
		at java.util.List
java.util.List does not have a no-arg default constructor.
	this problem is related to the following location:
		at java.util.List

在发布一个webservice的时候出现如上异常，在这里贴一下解决方法：

原因：在做webServices复杂类型值传递时，返回值的类型不可以用接口类型。例如List应该改为ArrayList,Map改为HashMap等。