没有名为“transactionManager"的 bean 可用 [英] No bean named 'transactionManager' available
问题描述
当我尝试使用 spring 代码创建关系时，我收到事务管理器错误.我在我的项目中使用 Mysql 和 Neo4j 数据库.我尝试了不同的解决方案，但无法解决.
When I tried to create relationship using spring code, I am getting Transaction manager error. I am using Mysql and Neo4j database in my project. I tries different solution but not able to resolve.
org.springframework.beans.factory.NoSuchBeanDefinitionException:否名为transactionManager"的 bean 可用:没有匹配为限定符找到 PlatformTransactionManager bean'transactionManager' - 既不匹配限定符也不匹配 bean 名称！
org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'transactionManager' available: No matching PlatformTransactionManager bean found for qualifier 'transactionManager' - neither qualifier match nor bean name match!
Pom.xml 文件如下
<?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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.10.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>1.5.10.RELEASE</version>
</dependency>
<!-- For Neo4J Graph Database -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-neo4j</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.9-rc</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
<version>1.5.10.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
<thymeleaf.version>3.0.2.RELEASE</thymeleaf.version>
<thymeleaf-layout-dialect.version>2.1.1</thymeleaf-layout-dialect.version>
</properties>
</project>
应用程序类
@SpringBootApplication
@EnableTransactionManagement
@EntityScan("projectone.entities")
public class Application {
public static void main(String[] args) {
//For Starting application
ApplicationContext applicationContext=SpringApplication.run(Application.class, args);
}
}
数据库配置文件:
@Configuration
@EnableJpaRepositories(basePackages = {"projectone.mysql"},
entityManagerFactoryRef = "dbEntityManager",
transactionManagerRef = "dbTransactionManager")
@EnableTransactionManagement
public class DatabaseConfiguration {
@Autowired
private Environment env;
@Bean
@Primary
public LocalContainerEntityManagerFactoryBean dbEntityManager() {
LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
em.setDataSource(dbDatasource());
em.setPackagesToScan(new String[]{"projectone.mysql"});
em.setPersistenceUnitName("dbEntityManager");
HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
em.setJpaVendorAdapter(vendorAdapter);
HashMap<String, Object> properties = new HashMap<>();
properties.put("hibernate.dialect",env.getProperty("hibernate.dialect"));
properties.put("hibernate.show-sql",env.getProperty("jdbc.show-sql"));
em.setJpaPropertyMap(properties);
return em;
}
@Primary
@Bean
public DataSource dbDatasource() {
DriverManagerDataSource dataSource
= new DriverManagerDataSource();
dataSource.setDriverClassName(
env.getProperty("spring.datasource.driverClassName"));
dataSource.setUrl(env.getProperty("spring.datasource.url"));
dataSource.setUsername(env.getProperty("spring.datasource.username"));
dataSource.setPassword(env.getProperty("spring.datasource.password"));
return dataSource;
}
@Primary
@Bean
public PlatformTransactionManager dbTransactionManager() {
JpaTransactionManager transactionManager
= new JpaTransactionManager();
transactionManager.setEntityManagerFactory(
dbEntityManager().getObject());
return transactionManager;
}
}
我通过删除数据库配置类尝试了最小配置.之后我的应用程序没有运行，我收到 Person is not a managed Bean 错误.
I tried minimal configuration by removing the database configuration class. After that my application is not running and I am getting Person is not a managed Bean error.
如果我只使用@SpringBootApplication 注释，那么我会收到以下异常:它在扔
If I use only @SpringBootApplication annotation then I am getting following Exception: It is throwing
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mappingController': Unsatisfied dependency expressed through field 'branchService';
nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'branchServiceImplementaion': Unsatisfied dependency expressed through field 'branchRepository';
nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'branchRepository': Unsatisfied dependency expressed through method 'setSession' parameter 0;
nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.data.neo4j.transaction.SharedSessionCreator#0': Cannot resolve reference to bean 'sessionFactory' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [org/springframework/boot/autoconfigure/data/neo4j/Neo4jDataAutoConfiguration.class]: Bean instantiation via factory method failed;
nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.neo4j.ogm.session.SessionFactory]: Factory method 'sessionFactory' threw exception; nested exception is NullPointerException
推荐答案
最后发现错误:
@Bean
public PlatformTransactionManager dbTransactionManager() {
JpaTransactionManager transactionManager
= new JpaTransactionManager();
transactionManager.setEntityManagerFactory(
dbEntityManager().getObject());
return transactionManager;
}
本节有错误导致上述问题.将@Bean 更改为 @Bean(name="transactionManager")，这解决了问题.
This section has mistake that caused the above issue. change @Bean to @Bean(name="transactionManager") and this solved the issue.
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