When the Eclipse ant is run, it appears: Specified VM install not found:type standard VM, 1.8

From Baidu on the turn:

Online plagiarism to copy, all said to be "workspace/.metadata/.plugins/org.eclipse.debug.core/.launches/" under the files are deleted.
It is true that the problem has been removed, but why this solves the problem and nobody says it.

The real problem solving method is here:
In the project, right-click the ant file, select Run as--External Tools Configuration, at the top of this page you will see a red fork error, error message is specified VM install not found:type St Andard VMs.
Then select the JRE tab, where you can reassign the JRE you are using, or simply select "Run in the same JRE as the workspace"

Problem solving. This is where the real problem is. The problem is to find out why, so as to avoid recidivism.

When the Eclipse ant is run, it appears: Specified VM install not found:type standard VM, 1.8