I've seen similar behavior in Netbeans IDE, when one of the libraries (Lift in particular) was depending on Scala 2.7.7 (not Scala 2.8). When scala-lang library 2.7.7 was on a class-path, that was somehow breaking the Scala support in Netbeans at all.
So check your PATH system variable, and the classpath.
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当其中一个库（特别是 Lift）依赖于 Scala 2.7.7（不是 Scala 2.8）时，我在 Netbeans IDE 中看到了类似的行为。当 scala-lang 库 2.7.7 位于类路径上时，这在某种程度上破坏了 Netbeans 中的 Scala 支持。
因此，请检查您的 PATH 系统变量和类路径。
I've seen similar behavior in Netbeans IDE, when one of the libraries (Lift in particular) was depending on Scala 2.7.7 (not Scala 2.8). When scala-lang library 2.7.7 was on a class-path, that was somehow breaking the Scala support in Netbeans at all.
So check your PATH system variable, and the classpath.