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How do I import a pre-existing Java project into Eclipse and get up and running?

Answer 1

A:

This assumes Eclipse and an appropriate JDK are installed on your system

Open Eclipse and create a new Workspace by specifying an empty directory.
Make sure you're in the Java perspective by selecting Window -> Open Perspective ..., select Other... and then Java
Right click anywhere in the Package Explorer pane and select New -> Java Project
In the dialog that opens give the project a name and then click the option that says "Crate project from existing sources."
In the text box below the option you selected in Step 4 point to the root directory where you checked out the project. This should be the directory that contains "com"
Click Finish. For this particular project you don't need to do any additional setup for your classpath since it only depends on classes that are part of the Java SE API.

Mike Deck 2008-09-27 03:25:45

Answer 2

+4 A:

Create a new Java project in Eclipse. This will create a src folder (to contain your source files).

Also create a lib folder (the name isn't that important, but it follows standard conventions).

Copy the ./com/* folders into the /src folder (you can just do this using the OS, no need to do any fancy importing or anything from the Eclipse GUI).

Copy any dependencies (jar files that your project itself depends on) into /lib (note that this should NOT include the TGGL jar - thanks to commenter Mike Deck for pointing out my misinterpretation of the OPs post!)

Copy the other TGGL stuff into the root project folder (or some other folder dedicated to licenses that you need to distribute in your final app)

Back in Eclipse, select the project you created in step 1, then hit the F5 key (this refreshes Eclipse's view of the folder tree with the actual contents.

The content of the /src folder will get compiled automatically (with class files placed in the /bin file that Eclipse generated for you when you created the project). IF you have dependencies (which you don't in your current project, but I'll include this here for completeness), the compile will fail initially because you are missing the dependency jar files from the project classpath.

Finally, open the /lib folder in Eclipse, right click on each required jar file and choose Build Path->Add to build path.

That will add that particular jar to the classpath for the project. Eclipse will detect the change and automatically compile the classes that failed earlier, and you should now have an Eclipse project with your app in it.

Kevin Day 2008-09-27 03:26:41

the TGGraphLayout.jar archive here isn't a dependency is just the compiled binary of the source that has been downloaded, therefore it doesn't need to be put into a lib directory and included on the build classpath. In fact this could cause some very confusing behaviors in Eclipse.

Mike Deck 2008-09-27 03:32:56

Answer 3

A:

Sorry to wake the dead guys. I've downloaded a JAR app off the net, and would like to see how it works. Is there any simple way to say to Eclipse "Take this JAR, decompile it, add it to a project in this current workspace?"

Or do I need to go about the above process manually?

Or is there a more clever approach?

Mike 2010-10-22 16:09:21

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How do I import a pre-existing Java project into Eclipse and get up and running?

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