accessible due to restriction on required library rt.jar

Eclipse Problem:

Access restriction: The type XmlAccessType is not accessible due to restriction on required library C:\j2ee\jdk1.7.0\jre\lib\rt.jar SayHi.java /sayhi/src/main/java/demo/hw/server/jaxws line 4 Java Problem

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发生问题时使用的开发环境：win 7 + jdk/jre 1.7  64位 + eclipse-jee-indigo-SR1-win32  

安装jdk1.6 32位，将buildpath修改为使用jdk 1.6 32位，问题解决

谢谢访问！