fix

Author: rmetzger

flink-runtime/src/main/java/org/apache/flink/runtime/util/EnvironmentInformation.java

@@ -22,6 +22,7 @@
 import java.lang.management.ManagementFactory;
 import java.lang.management.OperatingSystemMXBean;
 import java.lang.management.RuntimeMXBean;
+import java.lang.reflect.Method;
 import java.util.List;
 import java.util.Properties;