SpringBoot ComponentScan与多模块项目有关 [英] SpringBoot ComponentScan issue with multi-module project

问题描述

我有一个带myapp-core和myapp-web模块的myapp父pom类型maven项目。 myapp-core模块作为依赖项添加到myapp-web。

I have a myapp parent pom type maven project with myapp-core and myapp-web modules. myapp-core module is added as dependency to myapp-web.

myapp-core模块中的所有类都位于root包 com.myapp.core 并且myapp-web模块中的所有类都位于root包 com.myapp.web

All the classes in myapp-core module reside in root package com.myapp.core and all classes in myapp-web module reside in root package com.myapp.web

主Application.java也在com中.myapp.web包。由于我的核心模块根包不同，我为ComponentScan包含了共同的基本包com.myapp，如下所示：

The main Application.java is also in com.myapp.web package. As my core module root package is different I am including common base package "com.myapp" for ComponentScan as follows:

@Configuration
@ComponentScan(basePackages="com.myapp")
@EnableAutoConfiguration
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }   
}

现在令人惊讶的是，如果我使用此应用程序运行运行方式 - > Spring Boot App 它工作正常。但是，如果我将其作为运行方式 - > Java应用程序运行，则会失败并显示错误，说它无法在myapp-core模块中找到bean。

Now the surprising thing is if I run this app using Run As -> Spring Boot App it is working fine. But if I run it as Run As -> Java Application it is failing with error saying it can't found beans defined in myapp-core module.

如果我将 Application.java 移动到 com.myapp 包，它可以正常工作。
它应该工作，即使我也将它作为Java应用程序运行，对吗？

If I move my Application.java to com.myapp package it is working fine. It should work even if i run it as Java Application also, right?

推荐答案

启用调试日志级别后我发现扫描各种组件（如JPA存储库，JPA实体等）取决于Application.java的包名称。

After enabling debug log level for spring and going through extensive logs I found that scanning for various components like JPA Repositories, JPA Entities etc are depending on the Application.java's package name.

如果是JPA存储库或实体不在 Application.java 的包的子包中，然后我们需要明确指定它们如下：

If the JPA Repositories or Entities are not in sub packages of Application.java's package then we need to specify them explicitly as follows:

@Configuration
@ComponentScan(basePackages="com.sivalabs.jcart")
@EnableAutoConfiguration
@EnableJpaRepositories(basePackages="com.sivalabs.jcart")
@EntityScan(basePackages="com.sivalabs.jcart")
public class Application{

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

使用上述额外的 @ EnableJpaRepositories ， @EntityScan 我可以使用运行方式 - > Java应用程序来运行它。

With the above additional @EnableJpaRepositories, @EntityScan I am able to run it using Run As -> Java Application.

但是当 Run As - > Spring Boot App !!

无论如何，我认为将 Application.java 移动到 com.myapp 包更好，而不是与SpringBoot打架！

Anyway I think it is better to move my Application.java to com.myapp package rather than fighting with SpringBoot!

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