# Execution Environments Preferences

The following preferences can be set using the Java > Execution Environments preference page.

These preferences describe all of the available execution environments, allowing default JRE installations to be specified for any given environment.

Option | Description | Default
--- | --- | ---
Execution environments | The listing of all available execution environments |
Compatible JREs | The listing of compatible JRE installations that are compatible with the selected execution environment. You can select one (or none) of the installations to use as the default for the selected execution environment Any JRE installations that perfectly match the execution environment are marked with a label '(perfect match)' |
Environment description | Provides a description of the selected execution environment |

### Related Concepts

Debugger
Java perspectives
Java views
Local debugging
Remote debugging

### Related Tasks

Launching a Java program
Running and debugging

### Related Reference

Installed JREs Preferences
Java Debug Preferences
Run/Debug Preferences