Eclipse keeps Building workspace... and Building workspace... and Building workspace

Turns out bug 27940 hasn't been fixed yet.

I use the following workaround:

1. Disable "Project > Build Automatically"
2. Project > Clean
3. Project > Build All

Did you add your workspace to a Windows 7 library (i.e. the Windows Explorer Favorites or Windows Explorer Libraries)? Another user had a similar issue here.

If you have something open in a different editor (in the target directory of your project), this can also cause an infinite "Build Workspace" loop.

I solved it by opening my module's .project file. There were two redundant entries and deleting one helped:

<buildCommand>
    <name>org.eclipse.m2e.core.maven2Builder</name>
    <arguments>
    </arguments>
</buildCommand>
<buildCommand>
    <name>org.eclipse.m2e.core.maven2Builder</name>
    <arguments>
    </arguments>
</buildCommand>

Sometimes it can also be caused by the following two entries from which you have to remove the older org.maven.ide entry

<buildCommand>
  <name>org.maven.ide.eclipse.maven2Builder</name>
</buildCommand>
<buildCommand>
  <name>org.eclipse.m2e.core.maven2Builder</name>
</buildCommand>

It may also be that there are two identical natures:

<natures>
    <nature>org.eclipse.m2e.core.maven2Nature</nature>
</natures>
<natures>
    <nature>org.eclipse.m2e.core.maven2Nature</nature>
</natures>

or two natures from which one is old

<natures>
    <nature>org.eclipse.m2e.core.maven2Nature</nature>
</natures>
<natures>
    <nature>org.maven.ide.eclipse.maven2Nature</nature>
</natures>

Just delete the redundant one or the old org.maven.ide.eclipse.maven2Nature