Bug 68011 [java search] "Search the JRE System Libraries" looks like a local preference but behaves as a global one... [search]
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/search/JavaSearchPage.java
Group result= new Group(parent, SWT.NONE);
		result.setText(SearchMessages.SearchPage_searchFor_label); 
		result.setLayout(new GridLayout(2, true));
		fSearchFor= new Button[fSearchForText.length];
		for (int i= 0; i < fSearchForText.length; i++) {
			Button button= new Button(result, SWT.RADIO);
			button.setText(fSearchForText[i]);
			button.setSelection(i == TYPE);
			button.setLayoutData(new GridData());
			fSearchFor[i]= button;
		}
		
		Label filler= new Label(result, SWT.NONE);
		filler.setVisible(false);
		filler.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false, 1, 1));
		return result;		
	}
	
	private Control createLimitTo(Composite parent) {
		Group result= new Group(parent, SWT.NONE);
		result.setText(SearchMessages.SearchPage_limitTo_label); 
		result.setLayout(new GridLayout(2, true));
		
		SelectionAdapter listener= new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				updateUseJRE();
			}
		};
		fLimitTo= new Button[fLimitToText.length];
		for (int i= 0; i < fLimitToText.length; i++) {