diff --git a/headless-services/commons/commons-language-server/src/main/java/org/springframework/ide/vscode/commons/languageserver/util/SimpleLanguageServer.java b/headless-services/commons/commons-language-server/src/main/java/org/springframework/ide/vscode/commons/languageserver/util/SimpleLanguageServer.java
index d95db5b21..b827f173e 100644
--- a/headless-services/commons/commons-language-server/src/main/java/org/springframework/ide/vscode/commons/languageserver/util/SimpleLanguageServer.java
+++ b/headless-services/commons/commons-language-server/src/main/java/org/springframework/ide/vscode/commons/languageserver/util/SimpleLanguageServer.java
@@ -64,7 +64,7 @@ public abstract class SimpleLanguageServer implements LanguageServer, LanguageCl
 
 	private static final Scheduler RECONCILER_SCHEDULER = Schedulers.newSingle("Reconciler");
 
-	private final String EXTENSION_ID;
+	public final String EXTENSION_ID;
 
     private Path workspaceRoot;
 
diff --git a/headless-services/commons/language-server-test-harness/src/main/java/org/springframework/ide/vscode/languageserver/testharness/LanguageServerHarness.java b/headless-services/commons/language-server-test-harness/src/main/java/org/springframework/ide/vscode/languageserver/testharness/LanguageServerHarness.java
index 302c1055c..88c9a7d17 100644
--- a/headless-services/commons/language-server-test-harness/src/main/java/org/springframework/ide/vscode/languageserver/testharness/LanguageServerHarness.java
+++ b/headless-services/commons/language-server-test-harness/src/main/java/org/springframework/ide/vscode/languageserver/testharness/LanguageServerHarness.java
@@ -439,20 +439,22 @@ public class LanguageServerHarness {
 	ObjectMapper mapper = new ObjectMapper();
 
 	public void perform(Command command) throws Exception {
-		switch (command.getCommand()) {
-		case "sts.quickfix":
+		if (getQuickfixCommandId().equals(command.getCommand())) {
 			List<Object> args = command.getArguments();
 			assertEquals(2, args.size());
 			//Note convert the value to a 'typeless' Object becaus that is more representative on how it will be
 			// received when we get it in a real client/server setting (i.e. parsed from json).
 			Object untypedParams = mapper.convertValue(args.get(1), Object.class);
 			perform(server.quickfixResolve(new QuickfixResolveParams((String)args.get(0), untypedParams)).get());
-			return;
-		default:
+		} else {
 			throw new IllegalArgumentException("Unknown command: "+command);
 		}
 	}
 
+	private String getQuickfixCommandId() {
+		return "sts.quickfix."+server.EXTENSION_ID;
+	}
+
 	private void perform(WorkspaceEdit workspaceEdit) throws Exception {
 		Assert.isNull("Versioned WorkspaceEdits not supported", workspaceEdit.getDocumentChanges());
 		for (Entry<String, List<TextEdit>> entry : workspaceEdit.getChanges().entrySet()) {