Eclipse: “The import java.io cannot be resolved”

Question

I have several Android projects in Eclipse, and all is fine, except one (a library) that can not resolve any imports.

The java.io imports do resolve fine in other An

Answer 1

Check two things

Eclipse preferences

1. Check your Eclipse preferences: Java -> Installed JREs
2. The one that you're using should be marked and it should be a JDK not just a JRE.

Project build path

1. Also check your project's build path: Right click on the project -> Properties -> Java Build Path
2. Check in the libraries folder whether the JRE System Library is present and ...
3. If not add it using Add library -> JRE System Library and then select the correct one (from an installed JDK).

Answer 2

The following worked for me:

• Close the project and reopen it.

OR

• Clean the project ( = rebuilds the buildpath and thereby reconfigures the JDK libraries).

Answer 3

I was missing the JRE Systems Library in my Project Tree. And navigating to Projects' Build Path and 'Add(ing) Library' worked!

Answer 4

I am using Maven an this is what I did to re-solve -->

1. Right click on project
2. Maven -> Update Project. Make sure you choose 'Force update of Snapshots/Releases'.
3. Also check the 'clean project', 'update project conf from pom' and 'refresh workspace resource options' and click ok.