我最近开始学习春天。我在spring mvc项目中尝试使用spring数据jpa的一个简单示例。我在tomcat中部署war文件时收到以下错误。
Caused by: org.springframework.beans.factory.BeanCreationException: Error creati
ng bean with name '(inner bean)#584d15f2': Cannot resolve reference to bean 'ent
ityManagerFactory' while setting constructor argument; nested exception is org.s
pringframework.beans.factory.BeanCurrentlyInCreationException: Error creating be
an with name 'entityManagerFactory': Requested bean is currently in creation: Is
there an unresolvable circular reference?
at org.springframework.beans.factory.support.BeanDefinitionValueResolver
.resolveReference(BeanDefinitionValueResolver.java:359)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver
.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108)
at org.springframework.beans.factory.support.ConstructorResolver.resolve
ConstructorArguments(ConstructorResolver.java:634)
at org.springframework.beans.factory.support.ConstructorResolver.instant
iateUsingFactoryMethod(ConstructorResolver.java:444)
at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:11
19)
at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1014)
at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)
at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver
.resolveInnerBean(BeanDefinitionValueResolver.java:299)
... 92 more
Caused by: org.springframework.beans.factory.BeanCurrentlyInCreationException: E
rror creating bean with name 'entityManagerFactory': Requested bean is currently
in creation: Is there an unresolvable circular reference?
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistr
y.beforeSingletonCreation(DefaultSingletonBeanRegistry.java:347)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistr
y.getSingleton(DefaultSingletonBeanRegistry.java:223)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBe
an(AbstractBeanFactory.java:299)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean
(AbstractBeanFactory.java:194)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver
.resolveReference(BeanDefinitionValueResolver.java:351)
... 100 more
27-Sep-2015 17:56:45.304 INFO [http-apr-8080-exec-35] org.apache.catalina.startu
p.HostConfig.deployWAR Deployment of web application archive D:\ApacheTomcat\apa
che-tomcat-8.0.26\webapps\springTest.war has finished in 6,124 ms
我的控制器代码如下，
package com.demo.repo;
import com.demo.model.Customer;
import java.text.DateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Properties;
import javax.activation.DataSource;
import javax.persistence.EntityManagerFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.stereotype.Controller;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;
/**
* Handles requests for the application home page.
*/
@Controller
@Configuration
@EnableJpaRepositories("com.demo.repo")
@EnableTransactionManagement
public class HomeController {
@Autowired
customerRepository repository;
private static final Logger logger = LoggerFactory.getLogger(HomeController.class);
/**
* Simply selects the home view to render by returning its name.
*/
@Bean(destroyMethod = "close")
DataSource dataSource(Environment env) {
HikariConfig dataSourceConfig = new HikariConfig();
dataSourceConfig.setDriverClassName(env.getRequiredProperty("db.driver"));
dataSourceConfig.setJdbcUrl(env.getRequiredProperty("db.url"));
dataSourceConfig.setUsername(env.getRequiredProperty("db.username"));
dataSourceConfig.setPassword(env.getRequiredProperty("db.password"));
return (DataSource) new HikariDataSource(dataSourceConfig);
}
@Bean
LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource,
Environment env) {
LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setDataSource((javax.sql.DataSource) dataSource);
entityManagerFactoryBean.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
entityManagerFactoryBean.setPackagesToScan("com.demo.repo");
Properties jpaProperties = new Properties();
//Configures the used database dialect. This allows Hibernate to create SQL
//that is optimized for the used database.
jpaProperties.put("hibernate.dialect", env.getRequiredProperty("hibernate.dialect"));
//Specifies the action that is invoked to the database when the Hibernate
//SessionFactory is created or closed.
jpaProperties.put("hibernate.hbm2ddl.auto",
env.getRequiredProperty("hibernate.hbm2ddl.auto")
);
//Configures the naming strategy that is used when Hibernate creates
//new database objects and schema elements
jpaProperties.put("hibernate.ejb.naming_strategy",
env.getRequiredProperty("hibernate.ejb.naming_strategy")
);
//If the value of this property is true, Hibernate writes all SQL
//statements to the console.
jpaProperties.put("hibernate.show_sql",
env.getRequiredProperty("hibernate.show_sql")
);
//If the value of this property is true, Hibernate will format the SQL
//that is written to the console.
jpaProperties.put("hibernate.format_sql",
env.getRequiredProperty("hibernate.format_sql")
);
entityManagerFactoryBean.setJpaProperties(jpaProperties);
return entityManagerFactoryBean;
}
@Bean
JpaTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(entityManagerFactory);
return transactionManager;
}
@RequestMapping(value = "/", method = RequestMethod.GET)
public String home(Locale locale, Model model) {
logger.info("Welcome home! The client locale is {}.", locale);
Date date = new Date();
DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG, locale);
String formattedDate = dateFormat.format(date);
model.addAttribute("serverTime", formattedDate );
repository.save(new Customer("Jack", "Bauer"));
repository.save(new Customer("Chloe", "O'Brian"));
repository.save(new Customer("Kim", "Bauer"));
repository.save(new Customer("David", "Palmer"));
repository.save(new Customer("Michelle", "Dessler"));
for(Customer customer : repository.findAll())
{
System.out.println("Log Results :: "+customer.toString());
}
return "myhome";
}
}
任何人都可以告诉我我的代码有什么问题以及解决问题的任何建议。
答案 0 :(得分：2)
您的entityManagerFactory似乎需要在同一配置文件中定义的dataSource。
尝试将dataSource的定义移动到另一个配置类，或者，不要将dataSource作为参数传递，只需在{{1}中需要时调用dataSource()方法}}
entityManagerFactory提示：请勿混用@Autowired
Environment env;
@Bean
LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean entityManagerFactoryBean =
new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setDataSource((javax.sql.DataSource) dataSource());
....
}
和@Controller。为每个文件创建一个不同的文件。