Fix startup and EPP ordering (#5670)

spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/config/DefaultEnvironmentPostProcessor.java

@@ -26,6 +26,7 @@
 
 import org.springframework.beans.factory.config.YamlPropertiesFactoryBean;
 import org.springframework.boot.SpringApplication;
+import org.springframework.boot.context.config.ConfigDataEnvironmentPostProcessor;
 import org.springframework.boot.env.EnvironmentPostProcessor;
 import org.springframework.core.Ordered;
 import org.springframework.core.env.ConfigurableEnvironment;
@@ -49,6 +50,11 @@ public class DefaultEnvironmentPostProcessor implements EnvironmentPostProcessor
 
 	private static final Logger logger = LoggerFactory.getLogger(DefaultEnvironmentPostProcessor.class);
 
+	/**
+	 * The order for the processor - must run before the {@link ConfigDataEnvironmentPostProcessor}.
+	 */
+	public static final int ORDER = ConfigDataEnvironmentPostProcessor.ORDER - 5;
+
 	private final Resource serverResource = new ClassPathResource("/dataflow-server.yml");
 
 	private final Resource serverDefaultsResource = new ClassPathResource("META-INF/dataflow-server-defaults.yml");
@@ -106,6 +112,6 @@ public void postProcessEnvironment(ConfigurableEnvironment environment, SpringAp
 
 	@Override
 	public int getOrder() {
-		return 0;
+		return ORDER;
 	}
 }

spring-cloud-dataflow-server-core/src/main/resources/META-INF/dataflow-server-defaults.yml

@@ -52,6 +52,8 @@ server:
   error:
     include-message: always
 spring:
+  config:
+    use-legacy-processing: true
   mvc.async.request-timeout: 120000
   batch:
     initialize-schema: never