SpringBoot在多模块Java应用程序中无法识别来自其他模块的RestController

Question

我花了相当长的时间，但我无法通过这个（配置）问题。

技术栈:Java(1.8)、Springboot(starter-parent、starter-web)、Maven、IntelliJ IDEA

描述：尝试创建一个多模块Java应用程序，由2个模块组成（最初）：

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问题：Springboot在发送http请求时没有从webgateway模块=>404错误加载/扫描RestController

Github repo：https://Github.com/sorin-j/greeter

项目配置：

Greeter 
   |
   + pom.xml (parent pom)
   |
   + -- core                                            
   |     |
   |     + ...
   |     |
   |     + pom.xml
   |
   + -- webgateway 
         |
         + ...
         |
         + pom.xml (depends on core pom.xml)

<?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>

    <groupId>com.bet.jbs</groupId>
    <artifactId>Greeter</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>

    <modules>
        <module>core</module>
        <module>webgateway</module>
    </modules>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.3.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
</project>

<?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">

    <parent>
        <artifactId>Greeter</artifactId>
        <groupId>com.bet.jbs</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>

    <artifactId>core</artifactId>

</project>

<?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">

    <parent>
        <artifactId>Greeter</artifactId>
        <groupId>com.bet.jbs</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>

    <artifactId>webgateway</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.bet.jbs</groupId>
            <artifactId>core</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>

package com.bet.jbs.core;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan(basePackages = {"com.bet.jbs.core", "com.bet.jbs.webgateway"})
@EnableAutoConfiguration
public class MainApplication {

    public static void main(String[] args) throws Exception {
        SpringApplication.run(MainApplication.class, args);
    }
}

package com.bet.jbs.webgateway.controller;

import com.bet.jbs.core.util.GreetingGenerator;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class GreetingController {

    @RequestMapping(value = "/webgreeting", method = RequestMethod.GET)
    public String getGreeting() {
        return "WEBGATEWAY module says " + GreetingGenerator.getRandomGreeting();
    }
}

package com.bet.jbs.core.controller;

import com.bet.jbs.core.util.GreetingGenerator;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
/*
 * This REST controller should not be in the CORE component.
 * It is just for proving that this controller is recognized and the other one from WEBGATEWAY component is not.
 *
 */
@RestController
public class GreetingController {

    @RequestMapping(value = "/coregreeting", method = RequestMethod.GET)
    public String getGreeting() {
        return "CORE module says " + GreetingGenerator.getRandomGreeting();
    }
}

Answer 1

Spring Boot主应用程序位于core模块中，该模块不依赖于webgateway模块。因此，带有控制器的类在运行时不会出现，也不能被Spring发现。

修复：将webgateway的依赖项添加到核心，或者将Launcher/Main类移动到webgateway模块。

您还可以使用第三个模块，该模块执行启动并依赖于core和webgateway。