title: How do I build a Java project in Eclipse, to create an external JAR
body: <p>I recently inherited a large software project written in Java. The last developer used Eclipse, so that's what I'm using, but I can't figure out how to build anything. I don't see any build scripts, and when I open the project in Eclipse the "Build All" and "Build Project" options are greyed out.</p>
  
  <p>The project is essentially a huge collection of packages that depend on one another. I know this has to be a simple question but I haven't been able to find an answer through Googling or through just poking around on Eclipse. I'm very new to this IDE - I have worked with Visual Studio for most of my career. Any questions/suggestions would be very much appreciated.</p>