# 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.

Classpath Variables
Debugger
Java perspectives
Java views
Local debugging
Remote debugging

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

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