Bug 63883 Cannot configure option for enabling/disabling exclusion filters or custom output folders on a per project basis
Build M9 JDT/Core supports setting enablement for exclusion patterns and custom output folders on a per project basis. This isn't surfaced in the UI. There is only a global flag in workspace preferences.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CompilerConfigurationBlock.java
Composite outer= new Composite(folder, SWT.NULL);
		outer.setLayout(layout);
		
		String label= PreferencesMessages.getString("CompilerConfigurationBlock.pb_javadoc_support.label"); 
		addCheckBox(outer, label, PREF_JAVADOC_SUPPORT, enabledDisabled, 0);
		
		layout = new GridLayout();
		layout.numColumns= nColumns;
		layout.marginHeight= 0;
		
		
		Composite composite= new Composite(outer, SWT.NULL);
		composite.setLayout(layout);
		composite.setLayoutData(new GridData(GridData.FILL_BOTH));
		fJavadocComposite= composite;
		
		Label description= new Label(composite, SWT.WRAP);
		description.setText(PreferencesMessages.getString("CompilerConfigurationBlock.javadoc.description")); 
		GridData gd= new GridData();
		gd.horizontalSpan= nColumns;
		
		description.setLayoutData(gd);
			
		int indent= fPixelConverter.convertWidthInCharsToPixels(2);
		
		label = PreferencesMessages.getString("CompilerConfigurationBlock.pb_invalid_javadoc.label"); 
		addComboBox(composite, label, PREF_PB_INVALID_JAVADOC, errorWarningIgnore, errorWarningIgnoreLabels, 0);
		
		label = PreferencesMessages.getString("CompilerConfigurationBlock.pb_invalid_javadoc_tags_visibility.label");