Eclipse: How to add an existing source folder?

Solution 1:

I think all you need to do is refresh the project. Eclipse does not automatically pick up folders (or files) dropped into it's project directory.

Solution 2:

A screen capture might help, but if the GUI is un-cooperative, you can:

• close Eclipse
• open the .classpath file which defines your project (it may be located in your workspace)
• see if you can define a new classpathentry of kind "src": this is not the easy method, but that may give you an idea why the GUI refuses to define the same entry.

Solution 3:

For Linked Sources, you should have something like the following in your .classpath

<classpathentry kind="src" path="module_name"/>

With a corresponding matching entry (within <linkedResources>)in your .project

<link>
  <name>module_name</name>
  <type>2</type>
  <location>path/to/your/module</location>
</link>

NOTE: Removing a linked project doesn't necessarily remove it from the project.

Solution 4:

No need to close Eclipse. Open .project file using Notepad++, find link to the existing source/folder and delete it. Save the file. Refresh the project in Eclipse. Now you should be able to link it again.