Eclipse doesn't find javax.swing

There must be an installed (and selected) JDK in Eclipse:
```
Window > Preferences > Java > Installed JREs   
```
The project must be configured to use that JDK:
```
Project > Properties > Java Build Path > Libraries
```
there should be an entry like "JRE System Library [JDK7]" in the list. If not press:
```
Add Library... > JRE System Library
```
The project should have been created as a "Java Project":
```
Project > Properties > Builders
```
should include "Java Builder"

The accepted answer did not work for me.

This is how I solved it:

Right-Click on your project, select Properties

Go to Java Build Path

Click Libraries, then Add Library ...

Select JRE System Library

Click on Execution environment and select JavaSE-1.7 or JavaSE-1.8

Click Finish, then Apply and Close.

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