请教ant编译的问题(找不到lang包)

[kqwxf]

我在网上下了个OpenDMTP项目源码,运行里面的build.xml文件,提示
compile:
[echo] compile ...
[javac] Compiling 41 source files to E:\wuhe\OpenDMTP_client-j2me_1.2.0\buil
d\classes

[javac] WARNING

[javac] The -source switch defaults to 1.5 in JDK 1.5.
[javac] If you specify -target 1.1 you now must also specify -source 1.2.
[javac] Ant will implicitly add -source 1.2 for you. Please change your bui
ld file.
[javac] 致命错误：在类路径或引导类路径中找不到软件包 java.lang


java环境变量这些都检查了(我用的jdk6),实在不晓得哪里出错.麻烦哪位有经验的高手指点下啊.谢谢了!

[JarodYv]

检查你complile这个任务的的bootpath属性设置是否正确。