在Eclipse中调试时，Spring无法从共享的Gradle库（autowired bean中的依赖关系）中找到类 [英] Spring can't find class from shared Gradle library (dependency in autowired bean) when debugging in Eclipse

问题描述

我有一个基于Gradle的Spring MVC项目。我有一个网站项目（ zeario-web ），网络爬虫（ zeario-webcrawler ）和共享类（ zeario-sharedclientserverclasses ）。网页和网页抓取工具共享一些类（例如DTO或VO）。

I have a Spring MVC project which is Gradle-based. I have a website project (zeario-web), web crawler (zeario-webcrawler), and shared classes (zeario-sharedclientserverclasses). The web and web crawler share some classes (something like DTOs or VOs).

在我的网络应用程序中，我有一个 CrawlerController 一个 getWorkUnit 方法;这调用了一个方法，一个 CrawlerService 实例（ @Autowired depdency），反过来又使用一些类共享库。

In my web app, I have a CrawlerController with a getWorkUnit method; this calls a method on a CrawlerService instance (@Autowired depdency), which, in turn, uses some classes from the shared library.

我的问题是，我可以通过Gradle构建和部署我的Web应用程序的工作版本，但不能通过Eclipse。 Eclipse给我一个Spring运行时异常关于没有找到一个共享类，因此无法创建/注入服务实例。

My problem is that I can build and deploy a working version of my web app via Gradle, but not via Eclipse. Eclipse gives me a spring runtime exception about not finding one of the shared classes, and being therefore unable to create/inject the service instance.

从Tomcat日志中：

From the Tomcat logs:

org.springframework.beans.factory.BeanCreationException：创建名为crawlerController的bean时出错：自动连线依赖关系的注入失败;嵌套异常是org.springframework.beans.factory.BeanCreationException：无法自动连线字段：private com.zeario.service.CrawlerService com.zeario.api.v1.controller.CrawlerController.service;嵌套异常是java.lang.NoClassDefFoundError：com / zeario / api / v1 / model / workunit / PageDiscoveryWorkUnit

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'crawlerController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.zeario.service.CrawlerService com.zeario.api.v1.controller.CrawlerController.service; nested exception is java.lang.NoClassDefFoundError: com/zeario/api/v1/model/workunit/PageDiscoveryWorkUnit

代码片段

控制器定义（简化）：

Code Snippets

Controller definition (simplified):

@Controller
public class CrawlerController {


    @Autowired
    private CrawlerService service;

    // ... methods with @RequestMapping ...
}

服务类（简化）：

@Service
public class CrawlerService {

    public PageDiscoveryWorkUnit getPageDiscoveryWorkUnit() {
        return new PageDiscoveryWorkUnit();
    }

PageDiscoveryWorkUnit 是一个简单的POJO / Bean类。我有在 spring-servlet.xml 文件中声明的服务bean：

PageDiscoveryWorkUnit is a simple POJO/Bean class. I have my service beans declared in the spring-servlet.xml file:

<bean id="crawlerService" class="com.zeario.service.CrawlerService" />

Gradle配置

1）根项目（空，无源）定义 settings.gradle 中的子项目。依赖关系在 build.gradle 中：

Gradle Configuration

1) Root project (empty, no source) defines sub-projects in settings.gradle. Dependencies are in build.gradle:

project(':zeario-web') {
    dependencies {
        compile project(':zeario-sharedclientserver')
    }
}

project(':zeario-webcrawler') {
    dependencies {
        compile project(':zeario-sharedclientserver')
    }
}

2）项目在适用的情况下定义其他项目的依赖关系。例如，web项目构建文件包含：

2) Projects define dependencies on other projects where applicable. For example, the web project build file contains:

dependencies {
    // Guava, Spring MVC, etc. ...
    packed project(':zeario-sharedclientserver') // Shared code
    // ...
}

Eclipse配置

当我检查构建路径时，Eclipse正确显示项目依赖关系;例如，它显示 web 项目依赖于共享客户端/服务器项目。

推荐答案

非常感谢@Vidya谁帮助我意识到问题是 Eclipse ，而不是。问题是Eclipse无法将文件复制到它构建的JAR中。

Many thanks to @Vidya who helped me realize that the issue is Eclipse, not Gradle. The problem is that Eclipse failed to copy the files into the JAR that it built.

解决此问题的步骤：

• 右键单击Web项目并选择属性


• 点击部署程序集，然后单击添加


• 选择项目，并选择共享库


• 清理，重建和部署

• Right-click the Web project and pick Properties
• Click on Deployment Assembly and click Add
• Select Project, and pick the shared library
• Clean, rebuild, and deploy

Et中提琴，问题解决了！

Et viola, problem solved!

注意：Eclipse有时会有一个脑屁，要求您删除并重新添加项目依赖关系。我碰到了这个。

Note: Eclipse sometimes has a brain fart, and requires you to remove and re-add the project dependency. I ran into this, too.

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