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The icon that IntelliJ (v11.1) usually shows next to Java classes is a blue circle with a C. But for one of my classes this icon has a small "x" in the top left corner. This particular class is in a package with another class, which has just the usual C in a blue circle.
In case it matters, I'm using a Mac.
The class in question is AlertsHandler.
This icon shows that the class is excluded from the compilation, it can be changed in
Settings(Preferenceson Mac) |Compiler|Excludes.