Setting JRE for project build in Eclipse

Question

I found several selections in selecting execution environment in Eclipse:

What does it means all these selection? I see that all of them are related to java version. But what CDC and OSGi means? And what (unbound) means?

Answer 1

The whole list is a Execution environment's available.

Here is the complete list

https://wiki.eclipse.org/Execution_Environments#Standard_Execution_Environments

EE Name Description OSGi/Minimum-1.0 OSGi Minimum Execution Environment 1.0 - This is a subset of the J2ME Foundation 1.0 class libraries defined by OSGi to be the base for framework implementations.

OSGi/Minimum-1.1 OSGi Minimum Execution Environment 1.1 - This is a subset of the J2ME Foundation class libraries defined by OSGi to be the base for framework implementations.

CDC-1.0/Foundation-1.0 J2ME Foundation 1.0 - With the exception of some MicroEdition IO classes, Foundation 1.0 is a subset of J2SE 1.3.

CDC-1.1/Foundation-1.1 J2ME Foundation 1.1 - With the exception of some MicroEdition IO classes, Foundation 1.1 is a subset of J2SE 1.4.

And unbound means, that environment added that environment to your eclipse , and eclipse no more remembered it's path. You need to edit and give the location again.