Some polishing for RSocket support

spring-integration-rsocket/src/main/java/org/springframework/integration/rsocket/IntegrationRSocketAcceptor.java

@@ -136,7 +136,7 @@ class IntegrationRSocketAcceptor extends RSocketMessageHandler
 		Assert.notNull(dataMimeType, "No `dataMimeType` in the ConnectionSetupPayload and no default value");
 
 		MimeType metadataMimeType =
-				StringUtils.hasText(setupPayload.dataMimeType())
+				StringUtils.hasText(setupPayload.metadataMimeType())
 						? MimeTypeUtils.parseMimeType(setupPayload.metadataMimeType())
 						: this.defaultMetadataMimeType;
 		Assert.notNull(dataMimeType, "No `metadataMimeType` in the ConnectionSetupPayload and no default value");

spring-integration-rsocket/src/test/java/org/springframework/integration/rsocket/config/RSocketInboundGatewayParserTests-context.xml

@@ -9,6 +9,7 @@
 
 	<bean id="clientRSocketConnector" class="org.springframework.integration.rsocket.ClientRSocketConnector">
 		<constructor-arg value="https://example.org"/>
+		<property name="autoStartup" value="false"/>
 	</bean>
 
 	<bean id="rsocketStrategies" class="org.mockito.Mockito" factory-method="mock">

spring-integration-rsocket/src/test/java/org/springframework/integration/rsocket/config/RSocketOutboundGatewayParserTests-context.xml

@@ -9,6 +9,7 @@
 
 	<bean id="clientRSocketConnector" class="org.springframework.integration.rsocket.ClientRSocketConnector">
 		<constructor-arg value="https://example.org"/>
+		<property name="autoStartup" value="false"/>
 	</bean>
 
 	<int:channel id="requestChannel"/>