來源：http://hhw3.blog.163.com/blog/static/26909662013010787453/

When javac is compiling code it doesn't link against rt.jar by default. Instead it uses special symbol file lib/ct.sym with class stubs.
Surprisingly this file contains many but not all of internal sun classes.? And the answer is: javac -XDignore.symbol.file. That's what javac uses for compiling rt.jar."

?

所以加上這句 <compilerarg value="-XDignore.symbol.file"/> ：

<javac srcdir="src" destdir="${build.target.dir}/bin" encoding="${sourceEncoding}" source="1.6" target="1.6" debug="true" debuglevel="${debuglevel}" >???
????????? <classpath refid="aaa.classpath" />?
??????????<compilerarg value="-XDignore.symbol.file"/>???
</javac>

總結

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