# Installed JREs Preferences

The following preferences can be set using the Java > Installed JREs preference page.

This page allows a default JRE to be selected as well as adding new JRE installations.

Option | Description
--- | ---
Installed JREs | The current listing of installed JREs, allowing you to select the one to act as the workspace default
Add... | Adds a new JRE definition to the workbench.
Edit... | Allows you to edit the selected JRE.
Duplicate... | Creates a new JRE with the same attributes as the selected JRE.
Remove | Removes the selected JRE from the workbench.
Search... | Automatically searches for JREs installed in the local file system and creates corresponding JRE definitions in the workspace.

### Related Concepts

Classpath Variables
Debugger
Java perspectives
Java views
Local debugging
Remote debugging

### Related Tasks

Working with JREs
Adding a new JRE definition
Deleting a JRE definition
Assigning the default JRE for the workbench
Choosing a JRE for launching a project
Launching a Java program
Running and debugging
Using external null annotations

### Related Reference

Execution Environment Preferences
Java Debug Preferences
Run/Debug Preferences
Source Attachment