Choosing a JRE for a launch configuration
    
    
      Instead of using the default JRE for running and debugging all Java Application launch configurations, you can specifically assign a JRE for launching an individual
      configuration.    
    
      - 
        With a Java Application configuration selected in the
        
         Launch Configuration Dialog, select the JRE tab. Launch Configuration Dialog, select the JRE tab.
- 
        In the list of available JREs, select the JRE you want to use to launch this configuration and click Apply, then Run or Debug.      
      Note: Changing the JRE used for running does not affect the way Java source is compiled. You can adjust the build path to compile against custom
      libraries. 
    
    
   
      Java development tools (JDT)
   
      Working with JREs
      Adding a new JRE definition
      Deleting a JRE definition
      Choosing a default JRE
   
      Installed JREs preference page