![\"\"](\"https:\/\/www.baeldung.com\/wp-content\/uploads\/2021\/09\/Java-8-Featured-1024x536.png\")
<\/p>\n<\/p>\n
GraalVM<\/a> compiles Java applications into machine executables using its Ahead-Of-Time (AOT) compiler<\/strong>. These executables execute directly into the target machine without using a Just-In-Time (JIT) compiler. The GraalVM-produced binaries are smaller, have a fast start-up time, and provide peak performance without any warm-up<\/strong>. Besides, these executables have a lower memory footprint and CPU<\/strong> than the applications running on JVM.<\/p>\n Docker lets us package software components into a Docker Image and run as a Docker container. A Docker container contains everything the application needs to run including the application code, runtime, system tools, and libraries<\/strong>.<\/p>\n In this tutorial, we’ll discuss creating a GraalVM native image of a Java application. We’ll then talk about how to use this native image as a Docker image and run it as a Docker container.<\/p>\n Native Image is a technology that compiles Java code ahead of time into a native executable<\/strong>. This native executable includes only the code required to be executed at runtime. This includes application classes, standard library classes, the language runtime, and statically linked native code from JDK.<\/p>\n The Native Image Builder (native-image<\/em>) scans the application classes and other metadata to create a binary file specific to an operating system and architecture. The native-image<\/em> tool performs a static application code analysis to determine the classes and methods reachable while the application runs<\/strong>. It then compiles the required classes, methods, and resources into a binary executable.<\/p>\n There are several benefits of a native image executable:<\/p>\n In this section, we’ll build a GraalVM native image for a Spring Boot application. First, we need to install GraalVM and set the JAVA_HOME<\/em> environment variable. Second, create a Spring Boot application with the Spring Web<\/a> and GraalVM Native Support\u00a0dependencies:<\/p>\n We also need to add the following plugin<\/a> for the GraalVM native support:<\/p>\n This application contains a sample rest controller:<\/p>\n Let’s build the native executable using the Maven command:<\/p>\n The native-maven-plugin<\/em> builds the GraalVM native image. Since the GraalVM native image compiler performs static code analysis, the build time is high compared to the regular Java application compilation.<\/p>\n The following is the output of the GraalVM compilation:<\/p>\n In the above compilation output, the following are a few key points:<\/p>\n Post the successful build, we can find the native executable available in the target directory. This executable can be executed in the command line.<\/p>\n In this section, we’ll develop a Docker image for the native executable generated in the previous step.<\/p>\n Let us create the following Dockerfile:<\/p>\n Next, let us build the Docker image using the following command:<\/p>\n Post successful build, we can notice that springboot-graalvm-docker<\/em> Docker image is available:<\/p>\n We can execute this image using the following command:<\/p>\n The above command starts the container and we can notice the Spring Boot startup logs:<\/p>\n The application starts in 43 milliseconds<\/strong>. We can access the REST endpoint by accessing the following command:<\/p>\n It shows the following output:<\/p>\n In this article, we build a Docker image for a GraalVM native executable.<\/p>\n We started discussing the GraalVM native image and its advantages. It is useful for use cases requiring a first start-up and low memory footprint. Next, we generated the native executable of a Spring Boot application using the GraalVM native image compiler. Lastly, we developed a Docker Image with the native executable and started a Docker container with the image.<\/p>\n The source code for this application is available on over on GitHub<\/a>.<\/p>\n \u7acb\u523b\u8a3b\u518a\u53ca\u5831\u540d\u96fb\u8166\u88dc\u7fd2\u8ab2\u7a0b\u5427! <\/a> www.ITSec.vip<\/a> www.Sraa.com.hk<\/a> www.ITSec.hk<\/a> www.Penetrationtest.hk<\/a> www.ITSeceu.uk<\/a> Learn how to build a Docker image for a GraalVM native executable.<\/p>\n2. What is a Native Image<\/h2>\n
<\/div>\n3. Benefits of Native Image<\/h2>\n
<\/div>\n\n
4. Building a GraalVM Native Image<\/h2>\n
<\/div>\n<dependency>\r\n <groupId>org.springframework.boot<\/groupId>\r\n <artifactId>spring-boot-starter-web<\/artifactId>\r\n <version>3.1.4<\/version>\r\n<\/dependency>\r\n<\/code><\/pre>\n<build>\r\n <plugins>\r\n <plugin>\r\n <groupId>org.graalvm.buildtools<\/groupId>\r\n <artifactId>native-maven-plugin<\/artifactId>\r\n <version>0.9.27<\/version>\r\n <\/plugin>\r\n <\/plugins>\r\n<\/build><\/code><\/pre>\n@RestController\r\nclass HelloController {\r\n\t\r\n @GetMapping\r\n public String hello() {\r\n\treturn "Hello GraalVM";\r\n }\r\n}\r\n<\/code><\/pre>\n$mvn -Pnative native:compile<\/code><\/pre>\n========================================================================================================================\r\nGraalVM Native Image: Generating 'springboot-graalvm-docker' (executable)...\r\n========================================================================================================================\r\n<strong>[1\/8] Initializing... (42.7s @ 0.15GB)<\/strong>\r\nJava version: 17.0.8+9-LTS, vendor version: Oracle GraalVM 17.0.8+9.1\r\nGraal compiler: optimization level: 2, target machine: x86-64-v3, PGO: ML-inferred\r\nC compiler: gcc (linux, x86_64, 11.3.0)\r\nGarbage collector: Serial GC (max heap size: 80% of RAM)\r\n\/\/ Omitted for clarity\r\n<strong>[2\/8] Performing analysis... [******] (234.6s @ 1.39GB)<\/strong>\r\n15,543 (90.25%) of 17,222 types reachable\r\n25,854 (67.59%) of 38,251 fields reachable\r\n84,701 (65.21%) of 129,883 methods reachable\r\n4,906 types, 258 fields, and 4,984 methods registered for reflection\r\n64 types, 70 fields, and 55 methods registered for JNI access\r\n4 native libraries: dl, pthread, rt, z\r\n[3\/8] Building universe... (14.7s @ 2.03GB)\r\n[4\/8] Parsing methods... [*******] (55.6s @ 2.05GB)\r\n[5\/8] Inlining methods... [***] (4.9s @ 2.01GB)\r\n[6\/8] Compiling methods... [**********\r\n[6\/8] Compiling methods... [*******************] (385.2s @ 3.02GB)\r\n[7\/8] Layouting methods... [****] (14.0s @ 2.00GB)\r\n[8\/8] Creating image... [*****] (30.7s @ 2.72GB)\r\n48.81MB (58.93%) for code area: 48,318 compilation units\r\n30.92MB (37.33%) for image heap: 398,288 objects and 175 resources\r\n3.10MB ( 3.75%) for other data\r\n82.83MB in total\r\n\/\/ Omitted for clarity\r\nFinished generating 'springboot-graalvm-docker' in 13m 7s.\r\n\/\/ Omitted for clarity<\/code><\/pre>\n\n
5. Building a Docker Image<\/h2>\n
<\/div>\nFROM ubuntu:jammy\r\nCOPY target\/springboot-graalvm-docker \/springboot-graalvm-docker\r\nCMD ["\/springboot-graalvm-docker"]<\/code><\/pre>\n$docker build -t springboot-graalvm-docker .<\/code><\/pre>\n$docker images | grep springboot-graalvm-docker<\/code><\/pre>\n$docker run -p 8080:8080 springboot-graalvm-docker<\/code><\/pre>\n\/\/ Ommited for clarity\r\n*** INFO 1 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization <strong>completed in 14 ms<\/strong>\r\n*** INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''\r\n*** INFO 1 --- [ main] c.b.g.GraalvmDockerImageApplication : Started GraalvmDockerImageApplication in 0.043 seconds (process running for 0.046)<\/code><\/pre>\n$curl localhost:8080\r\n<\/code><\/pre>\nHello GraalVM<\/code><\/pre>\n6. Conclusion<\/h2>\n
<\/div>\n<\/p>\n
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