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[ JDK VERSION : J2SE 1.5.0 ] Since compilation errors marked in the source file might not be visible (scrolled out of the window), it would be very helpful if the icon that designates a modified and uncompiled source file (the red 1's and 0's) could be replaced with an error icon (maybe a big red 'X'). The times when it is valid for a "compile error" icon to be displayed are a subset of the times when it is valid for an "uncompiled" icon to be displayed, so there should be no conflict. This icon would allow a developer to edit out compilation errors before dedicating processing time to an actual build. Your builds wouldn't be halted because of simple syntax errors you did not notice were marked since they were scrolled out of the window.
Changing subcomponent to annotations.
There is the little square box at the top of the error sidebar (ie. the right hand side bar) that shows the current status of a file - red == errors, yellow == warning, green == ok.