Add JVM option for more MaxDirectMemorySize (#4739)

frameworks/Java/comsat/comsat-servlet-undertow.dockerfile

@@ -8,4 +8,4 @@ RUN gradle capsule -q
 FROM openjdk:8-jre-slim
 WORKDIR /comsat
 COPY --from=gradle /comsat/build/libs/comsat-0.3-capsule.jar app.jar
-CMD ["java", "-Dcapsule.mode=servlet-undertow", "-jar", "app.jar"]
+CMD ["java", "-Dcapsule.mode=servlet-undertow", "-XX:MaxDirectMemorySize=128M", "-jar", "app.jar"]