SpringBoot无法识别多模块Java应用程序中另一个模块的RestController

Question

SpringBoot无法识别多模块Java应用程序中另一个模块的RestController

Sor*_*n J 3 java intellij-idea maven multi-module spring-boot

我花了很多时间,但我无法解决这个(配置)问题.

技术堆栈: Java(1.8),Springboot(starter-parent,starter-web),Maven,IntelliJ IDEA

描述:尝试创建一个由两个模块组成的多模块Java应用程序(最初):

核心模块:主模块(主要业务逻辑,每个其他模块都应该通过这个看到并进行交互).该模块包含主应用程序类.
webgateway模块:Simple Rest Controller,用于映射请求并调用核心模块

问题:发送http请求时,Springboot不会从webgateway module => 404错误加载/扫描RestController

Github回购: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)

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父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>

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核心模块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">

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

    <modelVersion>4.0.0</modelVersion>

    <artifactId>core</artifactId>

</project>

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webgateway模块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">

    <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>

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核心模块的MainApplication类:

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);
    }
}

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来自webgateway模块的GreetingController类:

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();
    }
}

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只是为了测试它是否位于以相同的REST控制器将正常工作的核心模块,我创建了一个类似的GreetingController类也是在核心模块(这一个正常工作):

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();
    }
}

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Answer 1

Tho*_*mas 6

spring boot主应用程序位于核心模块中,该模块不依赖于webgateway模块.因此,具有控制器的类将不会在运行时出现,并且不能被spring发现.修复:将依赖关系添加到webgateway到核心或将启动器/主类移动到webgateway模块.您还可以使用第三个执行启动的模块,并具有核心和webgateway的依赖关系.

Answer 2

Kay*_*ayV 5

从前一天起我就陷入了这个问题......下面的解决方案肯定会为您节省很多时间！

我是这样解决的：

为主Application类创建一个单独的模块。

X-服务
- pom.xml（父级）
- child1 模块
  - pom.xml
- child2-模块
  - pom.xml
- 应用程序模块
  - pom.xml（包含 child1 和 child2 的依赖项）
  - src/main/java/Application.java

将所有模块添加为具有应用程序类的模块的 pom 中的依赖项。

 <?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>x-service</artifactId>
     <groupId>com.a.b.c</groupId>
     <version>0.0.1-SNAPSHOT</version>
 </parent>
 <modelVersion>4.0.0</modelVersion>

 <artifactId>app-module</artifactId>

 <dependencies>
     <dependency>
         <groupId>com.a.b.cs</groupId>
         <artifactId>child1-module</artifactId>
         <version>0.0.1-SNAPSHOT</version>
     </dependency>
     <dependency>
         <groupId>com.a.b.cs</groupId>
         <artifactId>child1-module</artifactId>
         <version>0.0.1-SNAPSHOT</version>
         <scope>compile</scope>
     </dependency>
 </dependencies>

 <build>
     <resources>
         <resource>
             <directory>src/main/resources</directory>
             <filtering>true</filtering>
         </resource>
     </resources>
     <plugins>
         <plugin>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-maven-plugin</artifactId>
             <configuration>
                 <executable>true</executable>
             </configuration>
         </plugin>
     </plugins>
 </build>

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保留主 pom 作为父 pom。

 <?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>
 <packaging>pom</packaging>
 <modules>
     <module>child1-module</module>
     <module>child2-module</module>
     <module>app-module</module>
 </modules>
 <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
     <version>2.1.2.RELEASE</version>
     <relativePath/>
 </parent>

 <groupId>com.a.b.c</groupId>
 <artifactId>x-service</artifactId>
 <version>0.0.1-SNAPSHOT</version>

 <properties>
     <java.version>1.8</java.version>
 </properties>

 <dependencies>

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


 </dependencies>

 <build>
     <plugins>
         <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-checkstyle-plugin</artifactId>
             <version>3.0.0</version>
         </plugin>
     </plugins>
 </build>

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将父 pom 工件添加为所有子 pom 中的父项。

 <?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>dxg-service</artifactId>
     <groupId>com.a.b.c</groupId>
     <version>0.0.1-SNAPSHOT</version>
 </parent>
 <modelVersion>4.0.0</modelVersion>

 <groupId>com.a.b.c</groupId>
 <artifactId>child1-module</artifactId>
 <version>0.0.1-SNAPSHOT</version>

 <dependencies>
     <dependency>
         <groupId>com.a.b.c</groupId>
         <artifactId>child2-modulde</artifactId>
         <version>0.0.1-SNAPSHOT</version>
     </dependency>
 </dependencies>

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更多详细信息请参见： https://medium.com/macoclock/how-create-multi-module-project-in-intellij-on-macos-50f07e52b7f9

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