Closes #403 Configure SB 2.3 layered docker image support

Author: bukajsytlos

Dockerfile

@@ -1,5 +1,14 @@
-FROM adoptopenjdk/openjdk11:alpine-jre
+FROM adoptopenjdk/openjdk11:alpine-jre as builder
+WORKDIR /application
+ARG JAR_FILE=build/libs/faf-java-api-*.jar
+COPY ${JAR_FILE} application.jar
+RUN java -Djarmode=layertools -jar application.jar extract
 
+FROM adoptopenjdk/openjdk11:alpine-jre
 VOLUME /tmp
-COPY build/libs/faf-java-api-*.jar app.jar
-ENTRYPOINT ["java", "-server", "-Djava.security.egd=file:/dev/./urandom", "-jar", "app.jar"]
+WORKDIR /application
+COPY --from=builder /application/dependencies/ ./
+COPY --from=builder /application/spring-boot-loader/ ./
+COPY --from=builder /application/snapshot-dependencies/ ./
+COPY --from=builder /application/application/ ./
+ENTRYPOINT ["java", "-server", "-Djava.security.egd=file:/dev/./urandom", "org.springframework.boot.loader.JarLauncher"]

build.gradle

@@ -171,6 +171,10 @@ task inttest(type: Test) {
   mustRunAfter test
 }
 
+bootJar {
+  layered()
+}
+
 // JACOCO & COVERALLS
 
 apply plugin: 'jacoco'

src/main/java/com/faforever/api/FafApiApplication.java

@@ -3,10 +3,15 @@
 import com.faforever.api.config.FafApiProperties;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.security.oauth2.OAuth2AutoConfiguration;
+import org.springframework.boot.autoconfigure.security.oauth2.authserver.OAuth2AuthorizationServerConfiguration;
+import org.springframework.boot.autoconfigure.security.oauth2.method.OAuth2MethodSecurityConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Import;
 import org.springframework.transaction.annotation.EnableTransactionManagement;
 
-@SpringBootApplication
+@SpringBootApplication(exclude = {OAuth2AutoConfiguration.class})
+@Import({OAuth2AuthorizationServerConfiguration.class, OAuth2MethodSecurityConfiguration.class})
 @EnableTransactionManagement
 @EnableConfigurationProperties({FafApiProperties.class})
 public class FafApiApplication {