* Highlight project you want to change the JDK version
* Press ‘Alt-Enter’ key combo or select ‘Tools -> Project Properties…’
* Select ‘Libraries’
* Select ‘Use Custom Settings’ radio button
* Click ‘Custom Settings…’ button
* Click ‘Change…’ button under the J2SE Version
* Click ‘New…’ button to bring up the ‘Create J2SE’ dialog
* Browse to select J2SE Executable and click OK button
* Click ‘OK’ buttons all the way to exit project properties dialog
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