Bug 5811 [preferences] Pref to set editor background color
It would be very useful to add a preference to change the background color of the Java editor, since all of the other elements are editable.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavaEditorPreferencePage.java
public final OverlayPreferenceStore.OverlayKey[] fKeys= new OverlayPreferenceStore.OverlayKey[] {
		
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, AbstractTextEditor.PREFERENCE_COLOR_FOREGROUND),
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND),
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.INT, JavaSourceViewerConfiguration.PREFERENCE_TAB_WIDTH),
		
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, IJavaColorConstants.JAVA_MULTI_LINE_COMMENT),
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, IJavaColorConstants.JAVA_MULTI_LINE_COMMENT + "_bold"),
		
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, IJavaColorConstants.JAVA_SINGLE_LINE_COMMENT),
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, IJavaColorConstants.JAVA_SINGLE_LINE_COMMENT + "_bold"),
		
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, IJavaColorConstants.JAVA_KEYWORD),
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, IJavaColorConstants.JAVA_KEYWORD + "_bold"),
				
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, IJavaColorConstants.JAVA_STRING),
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, IJavaColorConstants.JAVA_STRING + "_bold"),
		
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, IJavaColorConstants.JAVA_DEFAULT),
		new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, IJavaColorConstants.JAVA_DEFAULT + "_bold"),