[WIP] experimenting with maven and multistage docker

examples/maven/.dockerignore

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+target

examples/maven/.gitignore

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+*.iml
+target

examples/maven/Dockerfile

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+FROM maven as builder
+COPY pom.xml .
+RUN mvn dependency:resolve dependency:resolve-plugins
+ADD src ./src
+RUN mvn package
+
+FROM gcr.io/google-appengine/openjdk
+COPY --from=builder target/spring-boot-sample-simple-2.0.1.RELEASE.jar app.jar
+CMD ["java", "-jar", "app.jar"]

examples/maven/k8s-pod.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: spring-skaffold
+spec:
+  containers:
+  - name: spring-skaffold
+    image: gcr.io/k8s-skaffold/spring-skaffold
+

examples/maven/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.0.1.RELEASE</version>
+    </parent>
+	<artifactId>spring-boot-sample-simple</artifactId>
+	<name>Spring Boot Simple Sample</name>
+	<description>Spring Boot Simple Sample</description>
+
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <start-class>sample.simple.SampleSimpleApplication</start-class>
+    </properties>
+
+	<dependencies>
+		<!-- Compile -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.hibernate.validator</groupId>
+			<artifactId>hibernate-validator</artifactId>
+		</dependency>
+		<!-- Test -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+</project>

examples/maven/skaffold.yaml

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+apiVersion: skaffold/v1alpha2
+kind: Config
+build:
+  artifacts:
+  - imageName: gcr.io/k8s-skaffold/spring-skaffold
+deploy:
+  kubectl:
+    manifests:
+      - k8s-*
+profiles:
+  - name: gcb
+    build:
+      googleCloudBuild:
+        projectId: k8s-skaffold

examples/maven/src/main/java/sample/simple/SampleSimpleApplication.java

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+/*
+ *  Copyright 2018 original author or authors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package sample.simple;
+
+import sample.simple.service.HelloWorldService;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SampleSimpleApplication implements CommandLineRunner {
+
+
+    @Autowired
+    private HelloWorldService helloWorldService;
+
+    @Override
+    public void run(String... args) throws InterruptedException {
+        while (true) {
+            System.out.println(this.helloWorldService.getHelloMessage());
+            Thread.sleep(1000);
+        }
+
+    }
+
+    public static void main(String[] args) {
+        SpringApplication.run(SampleSimpleApplication.class, args);
+    }
+
+}

examples/maven/src/main/java/sample/simple/service/HelloWorldService.java

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+/*
+ *  Copyright 2018 original author or authors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package sample.simple.service;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+@Component
+public class HelloWorldService {
+
+	public String getHelloMessage() {
+		return "Hello World!";
+	}
+
+}