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I could not figure out how to reset my "Do not show this message again" choices. I inadvertently checked the "One or more programs were compiled with errors...", and I could not find a way to uncheck it (except by trashing my .netbeans folder). If the functionality exists, I guess it is not visible enough (I desperately looked after it in the Options panel). If it does not exist, a button in the Option panel would be welcomed.
Could you be more specific? I don't know which dialog do you mean. Please, describe step-by-step. Thank you.
Create a new Java project (ensure that compile on save is activated. Not sure it sure is necessary...) Create two classes. One with a valid main method (i.e. it prints out "Hello World"), an other with a compile error. When you run the valid class, you get a message "One or more programs were compiled with errors...". Check the box for "Do not show this message again", and click Ok. The class runs well printing out "Hello World". Now, try to uncheck the "Do not show this message again" checkbox, so that a compile errors prevent running. Note: the same is true for many other functionality that present "Do not show this message again" to the user.