java - 在 @Application bean 中使用构造函数注入(inject)会导致循环引用

Question

我有一个中型 Spring 应用程序。当我重构一些 loc 时，我注意到以下行为:

事实上，注入(inject)工作正常:

public class AppConfig {

    @Autowired
    private Environment env;
…

当我尝试使用构造函数注入(inject)时，环境为 null 我的应用程序告诉我，由于循环引用，它无法创建我的配置 bean:

public class AppConfig {

    private final Environment env;
    private final IndexableService indexableService;

    @Autowired
    public AppConfig(Environment env, IndexableService indexableService) {
        this.env = env;
        this.indexableService = indexableService;
    }
…

堆栈中的某个位置:

Caused by: org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'appConfig': Requested bean is currently in creation: Is there an unresolvable circular reference?

我尝试了一些在网上找到的解决方案，但没有任何帮助。我怎样才能正确调试这个？如何找到循环引用的创建位置？

<小时/>

编辑:

stacktrace on pastebin

log on pastebin

<小时/>

编辑2:

IndexableService 类:

package de.xx.yy.server.service;

import de.xx.yy.server.model.Indexable;

import java.util.List;

public interface IndexableService {

    List<Indexable> search(String searchString);

}

该类的实现:

package de.xxx.yyy.server.service;

import de.xxx.yyy.server.model.Indexable;
import io.leangen.graphql.annotations.GraphQLArgument;
import io.leangen.graphql.annotations.GraphQLQuery;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class IndexableServiceImpl implements IndexableService {

    private final Searcher searcher;

    @Autowired
    public IndexableServiceImpl(Searcher searcher) {
        this.searcher = searcher;
    }

    @GraphQLQuery(name = "search")
    public List<Indexable> search(@GraphQLArgument(name = "searchString") String searchString) {
        return searcher.search(searchString);
    }

}

PS:之前，我的环境刚刚为空(这就是该行被删除的原因)。我无法重现空环境，现在出现循环引用错误。

Answer 1

主要问题是由于缺少依赖项

Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'elasticSearch' defined in file [/Users/ry77/Workspace/Campus/$PROJECT-server/target/$COMPANY.$PROJECT.server-0.0.1-alpha/WEB-INF/classes/de/$COMPANY/$PROJECT/server/service/searchengine/ElasticSearch.class]: Unsatisfied dependency expressed through constructor parameter 0;

1)@EnableAutoConfiguration 或 @SpringBootApplication 应该出现在主类中
2)确保你的pom中有依赖

 <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jpa</artifactId>
    <version>2.0.8</version>
</dependency>
    or
  <dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
  </dependency

3)您的 Elastic 类应使用 @Component 进行注释，并使用 @autowired 进行注入(inject)

希望对你有帮助