I was wondering if anyone could help me understand what is wrong with my MVC application, as I am not much expert with the Spring ecosystem.
I want to create a REST endpoint (UserEndpoint) for user management. The endpoint should use a UserService that, in turn, uses a DAO (UserDAO). I am stuck at how I inject the dependency for the UserService in the UserEndpoint. I have been trying to use @Autowired, but when I do I get the following error:
2016-07-01 16:09:59.995 INFO 2080 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 3794 ms
2016-07-01 16:10:00.211 INFO 2080 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2016-07-01 16:10:00.222 INFO 2080 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2016-07-01 16:10:00.374 WARN 2080 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userEndpoint': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.diferdin.tests.obfuscatedmessagestore.service.UserService com.diferdin.tests.obfuscatedmessagestore.endpoint.UserEndpoint.userService; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.diferdin.tests.obfuscatedmessagestore.service.UserService] is defined: expected single matching bean but found 2: simpleUserService,getUserService
2016-07-01 16:10:00.381 INFO 2080 --- [ main] o.apache.catalina.core.StandardService : Stopping service Tomcat
2016-07-01 16:10:00.412 ERROR 2080 --- [ main] o.s.boot.SpringApplication : Application startup failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userEndpoint': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.diferdin.tests.obfuscatedmessagestore.service.UserService com.diferdin.tests.obfuscatedmessagestore.endpoint.UserEndpoint.userService; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.diferdin.tests.obfuscatedmessagestore.service.UserService] is defined: expected single matching bean but found 2: simpleUserService,getUserService
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
at com.diferdin.tests.obfuscatedmessagestore.ObfuscatedMessageStore.main(ObfuscatedMessageStore.java:11) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_91]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_91]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_91]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_91]
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144) [idea_rt.jar:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.diferdin.tests.obfuscatedmessagestore.service.UserService com.diferdin.tests.obfuscatedmessagestore.endpoint.UserEndpoint.userService; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.diferdin.tests.obfuscatedmessagestore.service.UserService] is defined: expected single matching bean but found 2: simpleUserService,getUserService
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:573) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
... 22 common frames omitted
Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.diferdin.tests.obfuscatedmessagestore.service.UserService] is defined: expected single matching bean but found 2: simpleUserService,getUserService
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1126) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
... 24 common frames omitted
2016-07-01 16:10:00.416 INFO 2080 --- [ main] .b.l.ClasspathLoggingApplicationListener : Application failed to start with classpath: [file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/charsets.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/deploy.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/cldrdata.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/dnsns.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/jaccess.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/jfxrt.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/localedata.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/nashorn.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/sunec.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/zipfs.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/javaws.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/jce.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/jfr.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/jfxswt.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/jsse.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/management-agent.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/plugin.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/resources.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/rt.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/ant-javafx.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/dt.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/javafx-mx.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/jconsole.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/packager.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/sa-jdi.jar, file:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/tools.jar, file:/Users/antonio/dev/IdeaProjects/ObfuscatedMessageStore/target/classes/, file:/Users/antonio/.m2/repository/org/springframework/boot/spring-boot-starter-web/1.3.5.RELEASE/spring-boot-starter-web-1.3.5.RELEASE.jar, file:/Users/antonio/.m2/repository/org/springframework/boot/spring-boot-starter/1.3.5.RELEASE/spring-boot-starter-1.3.5.RELEASE.jar, file:/Users/antonio/.m2/repository/org/springframework/boot/spring-boot/1.3.5.RELEASE/spring-boot-1.3.5.RELEASE.jar, file:/Users/antonio/.m2/repository/org/springframework/boot/spring-boot-autoconfigure/1.3.5.RELEASE/spring-boot-autoconfigure-1.3.5.RELEASE.jar, file:/Users/antonio/.m2/repository/org/springframework/boot/spring-boot-starter-logging/1.3.5.RELEASE/spring-boot-starter-logging-1.3.5.RELEASE.jar, file:/Users/antonio/.m2/repository/ch/qos/logback/logback-classic/1.1.7/logback-classic-1.1.7.jar, file:/Users/antonio/.m2/repository/ch/qos/logback/logback-core/1.1.7/logback-core-1.1.7.jar, file:/Users/antonio/.m2/repository/org/slf4j/slf4j-api/1.7.21/slf4j-api-1.7.21.jar, file:/Users/antonio/.m2/repository/org/slf4j/jcl-over-slf4j/1.7.21/jcl-over-slf4j-1.7.21.jar, file:/Users/antonio/.m2/repository/org/slf4j/jul-to-slf4j/1.7.21/jul-to-slf4j-1.7.21.jar, file:/Users/antonio/.m2/repository/org/slf4j/log4j-over-slf4j/1.7.21/log4j-over-slf4j-1.7.21.jar, file:/Users/antonio/.m2/repository/org/yaml/snakeyaml/1.16/snakeyaml-1.16.jar, file:/Users/antonio/.m2/repository/org/springframework/boot/spring-boot-starter-tomcat/1.3.5.RELEASE/spring-boot-starter-tomcat-1.3.5.RELEASE.jar, file:/Users/antonio/.m2/repository/org/apache/tomcat/embed/tomcat-embed-core/8.0.33/tomcat-embed-core-8.0.33.jar, file:/Users/antonio/.m2/repository/org/apache/tomcat/embed/tomcat-embed-el/8.0.33/tomcat-embed-el-8.0.33.jar, file:/Users/antonio/.m2/repository/org/apache/tomcat/embed/tomcat-embed-logging-juli/8.0.33/tomcat-embed-logging-juli-8.0.33.jar, file:/Users/antonio/.m2/repository/org/apache/tomcat/embed/tomcat-embed-websocket/8.0.33/tomcat-embed-websocket-8.0.33.jar, file:/Users/antonio/.m2/repository/org/springframework/boot/spring-boot-starter-validation/1.3.5.RELEASE/spring-boot-starter-validation-1.3.5.RELEASE.jar, file:/Users/antonio/.m2/repository/org/hibernate/hibernate-validator/5.2.4.Final/hibernate-validator-5.2.4.Final.jar, file:/Users/antonio/.m2/repository/javax/validation/validation-api/1.1.0.Final/validation-api-1.1.0.Final.jar, file:/Users/antonio/.m2/repository/org/jboss/logging/jboss-logging/3.3.0.Final/jboss-logging-3.3.0.Final.jar, file:/Users/antonio/.m2/repository/com/fasterxml/classmate/1.1.0/classmate-1.1.0.jar, file:/Users/antonio/.m2/repository/org/springframework/spring-web/4.2.6.RELEASE/spring-web-4.2.6.RELEASE.jar, file:/Users/antonio/.m2/repository/org/springframework/spring-webmvc/4.3.0.RELEASE/spring-webmvc-4.3.0.RELEASE.jar, file:/Users/antonio/.m2/repository/org/springframework/spring-aop/4.2.6.RELEASE/spring-aop-4.2.6.RELEASE.jar, file:/Users/antonio/.m2/repository/aopalliance/aopalliance/1.0/aopalliance-1.0.jar, file:/Users/antonio/.m2/repository/org/springframework/spring-beans/4.2.6.RELEASE/spring-beans-4.2.6.RELEASE.jar, file:/Users/antonio/.m2/repository/org/springframework/spring-context/4.2.6.RELEASE/spring-context-4.2.6.RELEASE.jar, file:/Users/antonio/.m2/repository/org/springframework/spring-core/4.2.6.RELEASE/spring-core-4.2.6.RELEASE.jar, file:/Users/antonio/.m2/repository/org/springframework/spring-expression/4.2.6.RELEASE/spring-expression-4.2.6.RELEASE.jar, file:/Users/antonio/.m2/repository/com/fasterxml/jackson/core/jackson-core/2.5.4/jackson-core-2.5.4.jar, file:/Users/antonio/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.5.4/jackson-databind-2.5.4.jar, file:/Users/antonio/.m2/repository/com/fasterxml/jackson/core/jackson-annotations/2.6.6/jackson-annotations-2.6.6.jar, file:/Users/antonio/.m2/repository/junit/junit/4.12/junit-4.12.jar, file:/Users/antonio/.m2/repository/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar, file:/Users/antonio/.m2/repository/org/hamcrest/hamcrest-all/1.3/hamcrest-all-1.3.jar, file:/Applications/IntelliJ%20IDEA.app/Contents/lib/idea_rt.jar]
Process finished with exit code 1
UserEndpoint.java:
package com.diferdin.tests.obfuscatedmessagestore.endpoint;
import com.diferdin.tests.obfuscatedmessagestore.domain.User;
import com.diferdin.tests.obfuscatedmessagestore.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import static org.springframework.web.bind.annotation.RequestMethod.GET;
import static org.springframework.web.bind.annotation.RequestMethod.POST;
@Controller
public class UserEndpoint {
@Autowired
private UserService userService;
@RequestMapping(value = "/users",
method = POST,
produces = "application/json")
public void createUser(@RequestParam(value = "name", required = false) String name) {
User user = new User(name);
userService.addUser(user);
}
@RequestMapping(value = "/users/{uuid}",
method = GET,
produces = "application/json")
public @ResponseBody User getUser(@RequestParam(value = "name", required = false, defaultValue = "World") int uuid) {
return userService.getUser(uuid);
}
}
UserService.java:
public interface UserService {
boolean addUser(User user);
User getUser(int uuid);
}
SimpleUserService.java:
@Service
public class SimpleUserService implements UserService {
private UserDao userDao;
@Override
public boolean addUser(User user) {
return userDao.addUser(user);
}
@Override
public User getUser(int uuid) {
return userDao.getUser(uuid);
}
}
MvcConfiguration.java:
@Configuration
@ComponentScan("com.diferdin.tests.obfuscatedmessagestore")
@EnableWebMvc
public class MvcConfiguration extends WebMvcConfigurerAdapter {
@Bean
public UserService getUserService() {
return new SimpleUserService();
}
}
pom.xml http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4.0.0
<groupId>com.diferdin.tests</groupId>
<artifactId>obfuscatedmessagestore</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.5.RELEASE</version>
</parent>
<properties>
<!--<springboot.version>1.3.5.RELEASE</springboot.version>-->
<spring-mvc.version>4.3.0.RELEASE</spring-mvc.version>
<spring-aop.version>4.3.0.RELEASE</spring-aop.version>
<spring-context.version>4.3.0.RELEASE</spring-context.version>
<jackson-core.version>2.5.4</jackson-core.version>
<jackson-databind.version>2.5.4</jackson-databind.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring-mvc.version}</version>
</dependency>
<!-- Jackson JSON Mapper -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${jackson-core.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson-databind.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-all</artifactId>
<version>1.3</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
I have seen questions asking about the same type of error, however they all use XML config files whereas in my case configuration is programmatic through a java file -- may well be wrong, as I said I am no expert.
Thanks in advance to anyone who can help.
