Use Gson instead of Jackson by default

spring-cloud-function-web/pom.xml

@@ -18,6 +18,16 @@
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>
+			<exclusions>
+				<exclusion>
+					<groupId>com.fasterxml.jackson.core</groupId>
+					<artifactId>jackson-databind</artifactId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+		<dependency>
+			<groupId>com.google.code.gson</groupId>
+			<artifactId>gson</artifactId>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.cloud</groupId>