Why do errors no longer appear in Eclipse's package explorer?

Question

My project used to be fine - errors showed up in the file margin, the editor breadcrumb, the problems view and in the package explorer tree as little red X marks.

Somewhat spontaneously though, it's stopped working properly.

If I introduce an error into my code, it shows up in the file margin, and nowhere else. It takes a 'project clean' to make the red X's show up elsewhere.

Then if I fix the problem, the error is cleared from the file margin but the red marks persist elsewhere until I do another clean.

Why is it no longer showing errors properly in an automatic way?

I'm using Eclipse 3.5

Answer 1

Did you uncheck Build Automatically?

Answer 2

I had a similar problem. I imported a project which also uses aspectj. compile errors were shown in the editors, but not in the package/navigator-explorers. And the project was marked as java-project, maven2 and aspectj.

Build path seemed ok.(jre was there, maven and aspectj.)

After long search i found that in the .project file the following entry was missing:

    <buildCommand>
        <name>org.eclipse.jdt.core.javabuilder</name>
        <arguments>
        </arguments>
    </buildCommand>

pasted that in and problem was solved!

Answer 3

Try fixing your build path, Java compiler, JRE first. If still no luck, You may want to take a look at project Properties-->Builders. Make sure "Java Builder" is there.