If you want to install JRE7 in Eclipse then we have given step by step details in this article.
Download Java and Install it.
Download Eclipse and Open it.
In Eclipse window, Right Click on Java Project and Click Properties -> Click on Library Tab -> Select Java Build Path.
You will get warning or Error: No JRE in workspace compatible with specified execution environment JAVA SE-1.7
Click on Alternate JRE Option -> Click on Installed JREs button (Don’t click on Finish Yet)
It will open a Dialogue box for Installed JREs and Click on Add.
Now Select the Type pf JREs -> Select Standard VM -> Click Next
Click on the Directory button to Select JRE7 Home Directory in Specify attributes for a JRE Dialogue box-> Click Finish
Verify whether newly added JRE7 is in the list or not. Click Ok
Now select Select JRE7 in Alternate JRE
Click Finish and verify whether Unbound error is gone or not.