Eclipse IDE - Error: Build path specifies execution environment Java SE 1.7

Question

In Eclipse, I am getting an error:

Build path specifies execution environment Java SE 1.7.
There are no JREs installed in the workspace that are strictly compatible with this environment.

Answer 1

Try this

 In Eclipse,
your project
-> properties
-> java build path : Libraries
Remove the "JRE System Library[J2SE 1.4]"
-> click "Add Library" button -> JRE System Library
-> select the new "Executin Environment" or Workspace default JRE

Answer 2

This should work:

• Your project > Build Path > Configure Build Path.
• Go to Libraries tab.
• Select JRE System Library [JavaSE-1.7].
• Press Edit.
• Notice that "Execution environment" is JavaSE-1.7 (jdk1.8.{y}).
• Click on Installed JREs.
• You should see jdk1.8.{y} but not jdk1.7.{x}.
• Press Add.
• Select Standard VM.
• Press Next.
• Locate your java folder, e.g.: C:\Program Files\Java\jdk1.7.{x}. If you don't have it, you need to install it.
• Populate JRE home with it. e.g. C:\Program Files\Java\jdk1.7.0_80.

"Execution environment" will be JavaSE-1.7 (jdk1.7.0_80) now.

Answer 3

Go to Project|Properties Choose the Java Build Path section Select the current JRE System Library, and choose Remove Select Add Library, and under the JRE System Library category pick your system library; you probably just need to choose the Workspace default JRE

More generally, under Window|Preferences, you can check Java|Installed JREs|Execution Environments to know which of the installed JREs match a specific execution environment.

Answer 4

Sounds like what I had after installing a newer Eclipse.

My solution:

Window->Preferences, Java->Installed JREs->Execution Environment.

Click the correct environment in the left panel, probably JavaSE-jre7

If the checkbox in the right panel is empty, check it.

If it's checked, but it isn't named jre7 [perfect match] then find the one in the left panel that does have 'perfect match' on the right and check that instead.

Answer 5

I have this situation because I have multiple JDKs, and the JREs are nested below them. I'm building a JRE8 project but my current default is the latest v11. So the challenge is to get Eclipse to recognize the JDK>JREv8.

1. Go to Preferences > Java > Installed JREs.
2. Click Add.
3. Navigate to the JRE under the JDK, which in my case is C:\Program Files\Java\jdk1.8.0_152\jre.
4. Change the JRE name to JDK8 JRE8 just for clarity.
5. Click Finish.

On build the error goes away. :)

Answer 6

Solved by

Right click on JRE System Library
Select Properties
Choose Workplace Default JRE
Apply and Close