经过几天的尝试,然后在SpringSource论坛上等待答案,
我会在这里尝试。
运行我的应用程序会导致以下异常:
org.springframework.beans.factory.UnsatisfiedDependencyException:
Error creating bean with name 'loginDAOImpl':
Unsatisfied dependency expressed through method 'setDataSource' parameter 0:
No qualifying bean of type [org.apache.tomcat.dbcp.dbcp.BasicDataSource]
found for dependency [org.apache.tomcat.dbcp.dbcp.BasicDataSource]:
expected at least 1 bean which qualifies as autowire candidate for this dependency.
Dependency annotations: {}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.apache.tomcat.dbcp.dbcp.BasicDataSource] found for dependency [org.apache.tomcat.dbcp.dbcp.BasicDataSource]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:648) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:349) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:776) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
at com.example.demo.DemoApplication.main(DemoApplication.java:10)
这是相关的代码
应用环境:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:annotation-config/>
<!-- Scans within the base package of the application for @Component classes to configure as beans -->
<context:component-scan base-package="com.example.demo" />
<bean id="dataSource" class="org.apache.tomcat.dbcp.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost/atata"/>
<property name="username" value="user"/>
<property name="password" value="pass"/>
</bean>
<context:property-placeholder location="jdbc.properties"/>
类LoginDAOImpl:
@Repository
public class LoginDAOImpl implements LoginDAO {
private JdbcTemplate jdbcTemplateObject;
@Autowired
public void setDataSource(BasicDataSource dataSource) {
this.jdbcTemplateObject = new JdbcTemplate(dataSource);
}
...
}
主要:
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
最佳答案
一般来说,
包含更多类似问题的详细信息。
特别,
什么是LoginDAOImpl类包?
LoginDAOImpl类中BasicDataSource类的导入是什么?
乍一看,我怀疑BasicDataSource导入将是org.apache.commons.dbcp.BasicDataSource
或org.apache.tomcat.dbcp.dbcp2.BasicDataSource
这与您在dataSource bean定义中使用的类不同。
<bean id="dataSource" class="org.apache.tomcat.dbcp.dbcp.BasicDataSource"
destroy-method="close">
可能性二:
您在dataSource bean配置中使用的用户名和密码值格式错误。如果user和pass是属性值,则应使用
${user}
和${pass}
。像这样:<bean id="dataSource" class="org.apache.tomcat.dbcp.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost/atata"/>
<property name="username" value="${user}"/>
<property name="password" value="${pass}"/>
</bean>
关于java - 为什么我会收到没有合格bean的错误?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/44573871/