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"Tools-->Options-->Java Code-->Hints" allows you to add hints for various conditions, and to specify if the hints should be treated as warnings or errors. all warning/error hints should be placed in the task list and have error/warning badges placed on the files so the problems are visible even when the file isn't the active editor. additionally, hints treated as errors should prevent compilation (at least from within the IDE).
*** Issue 105055 has been marked as a duplicate of this issue. ***
It's really not pleasant to have to open each Java source file to get compiler warnings/hints. Please add them to the tasklist with compiler errors and TODOs.
For this enhancement to work well, arguably another related enhancement would need to be implemented as well: hint settings should be stored on a project basis rather than on a userdir basis, since the set of warnings/errors that should be enabled depends on the code style for each particular project. Otherwise hint settings that might work well for one project might cause another one to fail its build. Analogy: In traditional "make"-based build systems, warning levels are stored in the Makefile (e.g. CFLAGS="-Wall -Wsign-compare -ansi"), which is usually distributed alongside the source code. (I'm in favor of both of these potential enhancement.)
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The "Action Items" view covers this and works quite nicely. Thanks!