diff --git a/spring-cloud-function-adapters/spring-cloud-function-adapter-azure/src/main/java/org/springframework/cloud/function/adapter/azure/FunctionInvoker.java b/spring-cloud-function-adapters/spring-cloud-function-adapter-azure/src/main/java/org/springframework/cloud/function/adapter/azure/FunctionInvoker.java
index 73840fb83..4e737f3f6 100644
--- a/spring-cloud-function-adapters/spring-cloud-function-adapter-azure/src/main/java/org/springframework/cloud/function/adapter/azure/FunctionInvoker.java
+++ b/spring-cloud-function-adapters/spring-cloud-function-adapter-azure/src/main/java/org/springframework/cloud/function/adapter/azure/FunctionInvoker.java
@@ -25,6 +25,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Optional;
+import java.util.function.Function;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.microsoft.azure.functions.ExecutionContext;
@@ -77,8 +78,6 @@ public class FunctionInvoker<I, O> {
 
 	private static ConfigurableApplicationContext APPLICATION_CONTEXT;
 
-	private final static Object LOCK = new Object();
-
 	private static JsonMapper OBJECT_MAPPER;
 
 	public FunctionInvoker(Class<?> configurationClass) {
@@ -251,7 +250,7 @@ public class FunctionInvoker<I, O> {
 	}
 
 	private static void initialize(Class<?> configurationClass) {
-		synchronized (LOCK) {
+		synchronized (FunctionInvoker.class.getName()) {
 			if (FUNCTION_CATALOG == null) {
 				logger.info("Initializing: " + configurationClass);
 				SpringApplication builder = springApplication(configurationClass);