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Nacos AOT

prerequisites

  • GraalVM22.0+ (JDK17)
  • native-image
  • Nacos Server

If you haven't downloaded GraalVM, you can download it from Download GraalVM.

If you don't have a native-image environment, you can configure according to Native Image.

You have to start a Nacos Server in backend , If you don't know steps, you can learn about quick start.

Quick Start

The complete code for this example can be found at: nacos-aot-sample

  1. Because SpringBoot2 does not support aot, you must specify SpringBoot as SpringBoot3 in dependency management:
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>3.0.6</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
  1. You would add nacos-config-spring-boot-starter or nacos-discovery-spring-boot-starter in your Spring application's dependencies :
<dependencies>
    <dependency>
        <groupId>com.alibaba.boot</groupId>
        <artifactId>nacos-config-spring-boot-starter</artifactId>
        <version>${latest.version}</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba.boot</groupId>
        <artifactId>nacos-discovery-spring-boot-starter</artifactId>
        <version>${latest.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
</dependencies>
  1. In order to use the process-aot feature of SpringBoot and more conveniently compile native-image programs, we also need spring-boot-maven-plugin and native-maven-plugin:
<profiles>
    <profile>
        <id>native</id>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.graalvm.buildtools</groupId>
                    <artifactId>native-maven-plugin</artifactId>
                    <version>0.9.25</version>
                    <executions>
                        <execution>
                            <id>compile</id>
                            <goals>
                                <goal>compile</goal>
                            </goals>
                        </execution>
                    </executions>
                    <configuration>
                        <classesDirectory>${project.build.outputDirectory}</classesDirectory>
                        <mainClass>com.alibaba.boot.nacos.sample.AotApplication</mainClass>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <executions>
                        <execution>
                            <id>process-aot</id>
                            <goals>
                                <goal>process-aot</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>
            </plugins>
        </build>
    </profile>
</profiles>
  1. You could define some configurations in application.properties:
nacos.config.server-addr=localhost:8848
nacos.discovery.server-addr=localhost:8848

nacos.config.server-addr and nacos.discovery.server-addr attribute configure "${host}:${port}" of your Nacos Server

  1. You could using @SpringBootApplication to annotate main class like normal SpringBoot Application and startup:
@SpringBootApplication
@NacosPropertySource(dataId = "example", autoRefreshed = true)
public class AotApplication {
    public static void main(String[] args) {
        SpringApplication.run(AotApplication.class, args);
    }
}

Note: @NacosPropertySource is used to specify the data-id of the configuration.

  1. Let's try the functions of @NacosInjected and @NacosValue, for more usage, see Nacos Spring Project.
@Controller
public class AotController {
    @NacosInjected
    private ConfigService configService;

    @NacosInjected
    private NamingService namingService;

    @NacosValue(value = "${flag:false}", autoRefreshed = true)
    private boolean flag;

    @ResponseBody
    @RequestMapping(value = "/config/get", method = GET)
    public String getConfig() throws NacosException {
        return configService.getConfig("example", "DEFAULT_GROUP", 5000);
    }

    @ResponseBody
    @RequestMapping(value = "/naming/get", method = GET)
    public List<Instance> getNaming(@RequestParam("serviceName") String serviceName) throws NacosException {
        return namingService.getAllInstances(serviceName);
    }

    @ResponseBody
    @RequestMapping(value = "/flag/get", method = GET)
    public boolean getFlag() {
        return flag;
    }
}
  1. Publish the configuration to the Nacos Server by calling the Nacos Open API, with dataId of example and content of flag=true
curl -X POST "http://127.0.0.1:8848/nacos/v1/cs/configs?dataId=example&group=DEFAULT_GROUP&content=flag=true"
  1. Enable the tracing agent on the command line with the java command from the GraalVM JDK:
$JAVA_HOME/bin/java -agentlib:native-image-agent=config-output-dir=/path/to/config-dir/ ...

Note: For more information about tracing agent, see Collect Metadata with the Tracing Agent.

  1. Run the java program and follow the steps below to use the program:

    1. Open localhost:8080/config/get with a browser, and the browser responds with flag=true.
    2. Open localhost:8080/flag/get with a browser, and the browser responds with true.
    3. Publish the configuration to the Nacos Server by calling the Nacos Open API, with dataId of example and content of flag=false
    curl -X POST "http://127.0.0.1:8848/nacos/v1/cs/configs?dataId=example&group=DEFAULT_GROUP&content=flag=false"
    1. Open localhost:8080/flag/get with a browser, and the browser responds with false.
    2. Register a service named example with Nacos server by calling Nacos Open API.
    curl -X POST 'http://127.0.0.1:8848/nacos/v1/ns/instance?serviceName=example&ip=127.0.0.1&port=8080'
    1. Open localhost:8080/naming/get?serviceName=example with a browser, and the browser responds with information about the service you just registered.

  2. Close the program and copy the file just generated to the classpath:META-INF/native-image/ folder, The file path is specified in step 8.

Note: nacos-aot-sample already includes these files, but you can still use the files you just generated.

  1. Run the following command and you will find the compiled executable program in the target folder.
mvn -DskipTests=true clean package -Pnative
  1. This executable program is what we want! Run the program and try step 9 again.

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