com.din.OSS 中构造函数的参数 0 需要找不到类型为“java.lang.String”的 bean
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【中文标题】com.din.OSS 中构造函数的参数 0 需要找不到类型为“java.lang.String”的 bean【英文标题】：Parameter 0 of constructor in com.din.OSS required a bean of type 'java.lang.String' that could not be found 【发布时间】：2018-12-06 10:24:59 【问题描述】：运行应用程序后控制台中显示的错误粘贴在下方
18:46:00.752 [main] DEBUG org.springframework.boot.devtools.settings.DevToolsSettings - Included patterns for restart : []
18:46:00.754 [main] DEBUG org.springframework.boot.devtools.settings.DevToolsSettings - Excluded patterns for restart : [/spring-boot-actuator/target/classes/, /spring-boot-devtools/target/classes/, /spring-boot/target/classes/, /spring-boot-starter-[\w-]+/, /spring-boot-autoconfigure/target/classes/, /spring-boot-starter/target/classes/]
18:46:00.754 [main] DEBUG org.springframework.boot.devtools.restart.ChangeableUrls - Matching URLs for reloading : [file:/D:/Automation/sts/stsworkspace/BduckApp-1/target/classes/]
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
[32m :: Spring Boot :: [39m[2m (v2.1.0.BUILD-SNAPSHOT)[0;39m
[2m2018-06-27 18:46:00.946[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mcom.din.BduckApp1Application [0;39m [2m:[0;39m Starting BduckApp1Application on KOR1064502 with PID 14192 (D:\Automation\sts\stsworkspace\BduckApp-1\target\classes started by rad9kor in D:\Automation\sts\stsworkspace\BduckApp-1)
[2m2018-06-27 18:46:00.947[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mcom.din.BduckApp1Application [0;39m [2m:[0;39m No active profile set, falling back to default profiles: default
[2m2018-06-27 18:46:00.991[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mConfigServletWebServerApplicationContext[0;39m [2m:[0;39m Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@47ebf699: startup date [Wed Jun 27 18:46:00 IST 2018]; root of context hierarchy
[2m2018-06-27 18:46:01.785[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mtrationDelegate$BeanPostProcessorChecker[0;39m [2m:[0;39m Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$6d259a6] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
[2m2018-06-27 18:46:02.216[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mo.s.b.w.embedded.tomcat.TomcatWebServer [0;39m [2m:[0;39m Tomcat initialized with port(s): 8080 (http)
[2m2018-06-27 18:46:02.229[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mo.apache.catalina.core.StandardService [0;39m [2m:[0;39m Starting service [Tomcat]
[2m2018-06-27 18:46:02.229[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36morg.apache.catalina.core.StandardEngine [0;39m [2m:[0;39m Starting Servlet Engine: Apache Tomcat/8.5.31
[2m2018-06-27 18:46:02.233[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ost-startStop-1][0;39m [36mo.a.catalina.core.AprLifecycleListener [0;39m [2m:[0;39m The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jre8\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jre8/bin/server;C:/Program Files/Java/jre8/bin;C:/Program Files/Java/jre8/lib/amd64;C:\Perl520\Perl64\bin;C:\Perl520\Perl64\site\bin;C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\Program Files (x86)\AMD APP\bin\x86_64;C:\Program Files (x86)\AMD APP\bin\x86;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\7-Zip;C:\Program Files\TortoiseSVN\bin;C:\Strawberry\c\bin;C:\Strawberry\perl\site\bin;C:\Strawberry\perl\bin;C:\Program Files\7-Zip;C:\Program Files\Black Duck Software\protexIP\bin;C:\Program Files\mysql\MySQL Utilities 1.6\;C:\Program Files\Black Duck Software\protexIP\bin;C:\Program Files\7-Zip;C:\Program Files (x86)\Toolbase Client;C:\Program Files\Git\cmd;C:\Users\rad9kor\anaconda3;C:\Users\rad9kor\anaconda3\Library\mingw-w64\bin;C:\Users\rad9kor\anaconda3\Library\usr\bin;C:\Users\rad9kor\anaconda3\Library\bin;C:\Users\rad9kor\anaconda3\Scripts;D:\Automation\sts\tool\sts-bundle\sts-3.9.4.RELEASE;;.]
[2m2018-06-27 18:46:02.329[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ost-startStop-1][0;39m [36mo.a.c.c.C.[Tomcat].[localhost].[/] [0;39m [2m:[0;39m Initializing Spring embedded WebApplicationContext
[2m2018-06-27 18:46:02.329[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ost-startStop-1][0;39m [36mo.s.web.context.ContextLoader [0;39m [2m:[0;39m Root WebApplicationContext: initialization completed in 1340 ms
[2m2018-06-27 18:46:02.459[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ost-startStop-1][0;39m [36mo.s.b.w.servlet.ServletRegistrationBean [0;39m [2m:[0;39m Servlet dispatcherServlet mapped to [/]
[2m2018-06-27 18:46:02.460[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ost-startStop-1][0;39m [36mo.s.b.w.servlet.ServletRegistrationBean [0;39m [2m:[0;39m Servlet webServlet mapped to [/h2-console/*]
[2m2018-06-27 18:46:02.462[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ost-startStop-1][0;39m [36mo.s.b.w.servlet.FilterRegistrationBean [0;39m [2m:[0;39m Mapping filter: 'characterEncodingFilter' to: [/*]
[2m2018-06-27 18:46:02.463[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ost-startStop-1][0;39m [36mo.s.b.w.servlet.FilterRegistrationBean [0;39m [2m:[0;39m Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
[2m2018-06-27 18:46:02.463[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ost-startStop-1][0;39m [36mo.s.b.w.servlet.FilterRegistrationBean [0;39m [2m:[0;39m Mapping filter: 'httpPutFormContentFilter' to: [/*]
[2m2018-06-27 18:46:02.463[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ost-startStop-1][0;39m [36mo.s.b.w.servlet.FilterRegistrationBean [0;39m [2m:[0;39m Mapping filter: 'requestContextFilter' to: [/*]
[2m2018-06-27 18:46:02.570[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mcom.zaxxer.hikari.HikariDataSource [0;39m [2m:[0;39m HikariPool-1 - Starting...
[2m2018-06-27 18:46:02.628[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mcom.zaxxer.hikari.HikariDataSource [0;39m [2m:[0;39m HikariPool-1 - Start completed.
[2m2018-06-27 18:46:02.660[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mj.LocalContainerEntityManagerFactoryBean[0;39m [2m:[0;39m Building JPA container EntityManagerFactory for persistence unit 'default'
[2m2018-06-27 18:46:02.669[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mo.hibernate.jpa.internal.util.LogHelper [0;39m [2m:[0;39m HHH000204: Processing PersistenceUnitInfo [
name: default
...]
[2m2018-06-27 18:46:02.816[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36morg.hibernate.Version [0;39m [2m:[0;39m HHH000412: Hibernate Core 5.3.1.Final
[2m2018-06-27 18:46:02.817[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36morg.hibernate.cfg.Environment [0;39m [2m:[0;39m HHH000206: hibernate.properties not found
[2m2018-06-27 18:46:02.869[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mo.hibernate.annotations.common.Version [0;39m [2m:[0;39m HCANN000001: Hibernate Commons Annotations 5.0.3.Final
[2m2018-06-27 18:46:02.954[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36morg.hibernate.dialect.Dialect [0;39m [2m:[0;39m HHH000400: Using dialect: org.hibernate.dialect.H2Dialect
[2m2018-06-27 18:46:03.084[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mo.h.t.schema.internal.SchemaCreatorImpl [0;39m [2m:[0;39m HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl@152501c5'
[2m2018-06-27 18:46:03.086[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mj.LocalContainerEntityManagerFactoryBean[0;39m [2m:[0;39m Initialized JPA EntityManagerFactory for persistence unit 'default'
[2m2018-06-27 18:46:03.099[0;39m [33m WARN[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mConfigServletWebServerApplicationContext[0;39m [2m:[0;39m Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'bduckTrigger': Unsatisfied dependency expressed through field 'oss'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'OSS' defined in file [D:\Automation\sts\stsworkspace\BduckApp-1\target\classes\com\din\OSS.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.lang.String' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations:
[2m2018-06-27 18:46:03.099[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mj.LocalContainerEntityManagerFactoryBean[0;39m [2m:[0;39m Closing JPA EntityManagerFactory for persistence unit 'default'
[2m2018-06-27 18:46:03.099[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36m.SchemaDropperImpl$DelayedDropActionImpl[0;39m [2m:[0;39m HHH000477: Starting delayed evictData of schema as part of SessionFactory shut-down'
[2m2018-06-27 18:46:03.101[0;39m [33m WARN[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mo.s.b.f.support.DisposableBeanAdapter [0;39m [2m:[0;39m Invocation of destroy method failed on bean with name 'inMemoryDatabaseShutdownExecutor': org.h2.jdbc.JdbcSQLException: Database is already closed (to disable automatic closing at VM shutdown, add ";DB_CLOSE_ON_EXIT=FALSE" to the db URL) [90121-197]
[2m2018-06-27 18:46:03.101[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mcom.zaxxer.hikari.HikariDataSource [0;39m [2m:[0;39m HikariPool-1 - Shutdown initiated...
[2m2018-06-27 18:46:03.103[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mcom.zaxxer.hikari.HikariDataSource [0;39m [2m:[0;39m HikariPool-1 - Shutdown completed.
[2m2018-06-27 18:46:03.105[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mo.apache.catalina.core.StandardService [0;39m [2m:[0;39m Stopping service [Tomcat]
[2m2018-06-27 18:46:03.114[0;39m [32m INFO[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mConditionEvaluationReportLoggingListener[0;39m [2m:[0;39m
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
[2m2018-06-27 18:46:03.208[0;39m [31mERROR[0;39m [35m14192[0;39m [2m---[0;39m [2m[ restartedMain][0;39m [36mo.s.b.d.LoggingFailureAnalysisReporter [0;39m [2m:[0;39m
***************************
APPLICATION FAILED TO START
***************************
Description:
Parameter 0 of constructor in com.din.OSS required a bean of type 'java.lang.String' that could not be found.
Action:
Consider defining a bean of type 'java.lang.String' in your configuration.
包下有3个类
com.din
BduckApp1Application.java
BduckTrigger.java
OSS.java
BduckApp1Application.java
package com.din;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class BduckApp1Application
public static void main(String[] args)
SpringApplication.run(BduckApp1Application.class, args);
BduckTrigger.java
package com.din;
import java.util.Vector;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class BduckTrigger
@Autowired
OSS oss;
Vector<OSS> osses = new Vector<>();
@RequestMapping("/bd")
public Vector<OSS> LogintoProtex()
oss = OSS.builder().name("Dinesh").version("1.0").license("apache 2.0").usage("dynamic").comment("approved").build();
osses.add(oss);
oss = OSS.builder().name("Nikesh").version("2.0").license("BSD 2.0").usage("static").comment("disapproved").build();
osses.add(oss);
return osses;
OSS.java
package com.din;
import org.springframework.stereotype.Component;
import lombok.Builder;
import lombok.Getter;
@Getter
@Builder
@Component
public class OSS
public String name;
public String version;
public String license;
public String usage;
public String comment;
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.din.bd</groupId>
<artifactId>BduckApp-1</artifactId>
<version>1.0.0</version>
<packaging>jar</packaging>
<name>BduckApp-1</name>
<description>Microservice project for Bduck</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.BUILD-SNAPSHOT</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
<pluginRepository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
</project>
我尝试了在各种 *** 帖子中针对类似错误提到的所有解决方案。所有人都建议，将类移动到与@SpringBootApplication 类相同的文件夹或包含具有basepackage 属性的包。没有一个对我有用。任何帮助都会很棒！
【问题讨论】：
能否检查post是否有类似问题 @soufrk Nope.. 问题是因为 OSS 类混合了 lombok 和 spring 注释 【参考方案1】：注意：您为 Spring 和 Lombok 配置了 OSS bean。
关于 Lombok，您在类级别声明 @Builder 可能会生成一个构造函数。
问题是从 Spring 4 开始，默认情况下，声明构造函数的 Spring 组件会自动被视为自动装配构造函数。 而您遇到的异常。
查看您实例化 OSS 实例的方式：
oss = OSS.builder().name("Dinesh").version("1.0").license("apache 2.0").usage("dynamic").comment("approved").build();
OSS 不必配置为 Spring bean，但必须是手头创建的普通对象。
你不想创建这个对象的单个实例，你想根据客户端请求实例化它，最后你也不想在客户端之间共享它。
所以只要去掉这个类的@Component注解即可。
【讨论】：
我不得不删除 BduckTrigger.java 中 OSS 对象的 @Autowire 并且它起作用了。谢谢 @Dinesh Ravi 欢迎您。确实，它也是必需的。 如果我只删除 OSS.java 中的 \\@component 并为 oss 实例对象保留 @Autowired，则会引发此错误，->“com.din.BduckTrigger 中的字段 oss 需要一个类型为 ' 的 bean com.din.OSS' 找不到。行动：考虑在您的配置中定义一个类型为 'com.din.OSS' 的 bean。" @Dinesh Ravi 这很有意义:) 如果我想从你提到的“你不想创建这个对象的单个实例，你想根据客户请求实例化它，最后你不也想在客户之间分享”->我的方法应该是什么？以上是关于com.din.OSS 中构造函数的参数 0 需要找不到类型为“java.lang.String”的 bean的主要内容，如果未能解决你的问题，请参考以下文章
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