I found following information from web, basically, you should use java 1.3.1. it is open source, and you can modify the source code to make it run under JDK1.6 if you like.
The Java version of Nachos only supports Java 1.3.1, as the security manager and set of reserved keywords has changed in later versions. Instructional machines already have 1.3.1 installed. For remote users, you can download 1.3.1 here: http://java.sun.com/j2se/1.3/download.html . If you are curious to see what version of java you are using you can run the following command "java -version". We cannot stress strongly enough that you should not use java 1.4 or java 1.5. You might run into transient errors that will not show up as warnings or errors during compile time.
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我认为您需要在编译或运行该操作系统时添加参数
-source 1.3I think you need to add a argument
-source 1.3while compiling or running that OS我从网上找到了以下信息，基本上，你应该使用java 1.3.1。它是开源的，如果您愿意，您可以修改源代码使其在JDK1.6下运行。
I found following information from web, basically, you should use java 1.3.1. it is open source, and you can modify the source code to make it run under JDK1.6 if you like.