我试图将应用程序与我的数据库连接，但当我尝试运行它时，出现此错误:
Error creating bean with name 'barcodeIngDao': Unsatisfied dependency expressed through method setSessionFactory' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sessionFactory' defined in server.Application: Unsatisfied dependency expressed through method 'sessionFactory' parameter 0; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'sessionFactory': Requested bean is currently in creation: Is there an unresolvable circular reference?
barcodeIngDao 只是一个带有 @Repository 的类，它扩展了 GenericDaoHibernate:
package server.util;
import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import server.exceptions.InstanceNotFoundException;
public class GenericDaoHibernate<E, PK extends Serializable> implements
GenericDao<E, PK> {
private SessionFactory sessionFactory;
private Class<E> entityClass;
@SuppressWarnings("unchecked")
public GenericDaoHibernate() {
this.entityClass = (Class<E>) ((ParameterizedType) getClass()
.getGenericSuperclass()).getActualTypeArguments()[0];
}
@Autowired
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
protected Session getSession() {
return sessionFactory.getCurrentSession();
}
public void save(E entity) {
getSession().saveOrUpdate(entity);
}
public E find(PK id) throws InstanceNotFoundException {
E entity = (E) getSession().get(entityClass, id);
if (entity == null) {
throw new InstanceNotFoundException(id, entityClass.getName());
}
return entity;
}
public void remove(PK id) throws InstanceNotFoundException {
getSession().delete(find(id));
}
}
这是我的Application.java:
package server;
import javax.persistence.EntityManagerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.orm.jpa.vendor.HibernateJpaSessionFactoryBean;
@SpringBootApplication(exclude=HibernateJpaAutoConfiguration.class)
public class Application {
@Bean
public HibernateJpaSessionFactoryBean sessionFactory(EntityManagerFactory emf) {
HibernateJpaSessionFactoryBean fact = new HibernateJpaSessionFactoryBean();
fact.setEntityManagerFactory(emf);
return fact;
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
这是我的 application.properties:
spring.datasource.url=jdbc:postgresql://localhost:5432/AppRecipe?useSSL=false
spring.datasource.username=uibRT
spring.datasource.password=uibRT
spring.datasource.driver-class-name=org.postgresql.Driver
spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate5.SpringSessionContext
我知道我的Application.java在@SpringBootApplication中带有@ComponentScan，它试图为barcodeIngDao创建bean，因为@Repository，并且barcodeIngDao扩展了GenericDaoHibernate，所以它尝试在应用程序时为SessionFactory创建bean .java 仍处于扫描步骤，因此尚未为 SessionFactory 创建 bean。
问题是我不知道在扫描所有类之前是否有办法为 SessionFactory 创建 bean，或者我是否做错了什么并且这不是我之前所说的
编辑 如果我尝试这样做:
package server.barcodeing;
import javax.persistence.EntityManagerFactory;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import server.util.GenericDaoHibernate;
@Repository("barcodeIngDao")
public class BarcodeIngDaoHibernate extends
GenericDaoHibernate<BarcodeIng, Long> implements BarcodeIngDao {
@Autowired
private EntityManagerFactory entityManagerFactory;
public SessionFactory getSessionFactory(){
return this.entityManagerFactory.unwrap(SessionFactory.class);
}
}
我收到此错误:
Error creating bean with name 'barcodeIngDao': Unsatisfied dependency expressed through method 'setSessionFactory' parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.hibernate.SessionFactory' available: expected at least 1 bean which qualifies as autowire candidate.
编辑2
如果我删除 Application.java 中的 except=HibernateJpaAutoConfiguration.class，我会收到此错误:
Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'javax.sql.DataSource' available: expected at least 1 bean which qualifies as autowire candidate.
编辑3
如果我为此替换 Application.java 中的 SessionFactory 方法:
@Bean
public SessionFactory sessionFactory(@Qualifier("entityManagerFactory") EntityManagerFactory emf) {
return emf.unwrap(SessionFactory.class);
}
我收到此错误:
Error creating bean with name 'barcodeIngDao': Unsatisfied dependency expressed through method 'setSessionFactory' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sessionFactory' defined in server.Application: Unsatisfied dependency expressed through method 'sessionFactory' parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'javax.persistence.EntityManagerFactory' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Qualifier (value=entityManagerFactory)}
编辑4
通过编辑和 edit2 将此依赖项放入 pom 后，我可以运行服务器:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
现在的问题是当我尝试执行请求时出现此错误:
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause java.lang.NullPointerException at server.util.GenericDaoHibernate.getSession(GenericDaoHibernate.java:33)
完整错误:
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause java.lang.NullPointerException
at server.util.GenericDaoHibernate.getSession(GenericDaoHibernate.java:33)
at server.util.GenericDaoHibernate.find(GenericDaoHibernate.java:41)
at server.util.GenericDaoHibernate$$FastClassBySpringCGLIB$$eda6dc96.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:721)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:656)
at server.recipe.RecipeDaoHibernate$$EnhancerBySpringCGLIB$$1857692b.find(<generated>)
at server.recipeservice.RecipeServiceImpl.findRecipeById(RecipeServiceImpl.java:26)
at server.recipeservice.RecipeServiceImpl$$FastClassBySpringCGLIB$$1b7b075.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:721)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:656)
at server.recipeservice.RecipeServiceImpl$$EnhancerBySpringCGLIB$$14ef69a4.findRecipeById(<generated>)
at server.controllers.RecipeController.recipeId(RecipeController.java:33)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
最佳答案
您可以尝试在每个 DAO 类中展开 SessionFactory。
这对我来说是工作..
@Autowired private EntityManagerFactory entityManagerFactory;
public SessionFactory getSessionFactory(){
return this.entityManagerFactory.unwrap(SessionFactory.class);
}
您试图在 setSessionFactory 方法中创建 @autowired 并抛出
通过'setSessionFactory'方法表达的依赖关系不满足
删除它并注释 SessionFactory Bean 定义。
我发现您没有使用 Jpa 自动配置
@SpringBootApplication(exclude=HibernateJpaAutoConfiguration.class)
也删除排除参数。
编辑2: 将其添加到您的 MainClass
@PropertySource({"classpath:application.properties"})
可能它没有读取 application.properties 文件。
关于java - 当我尝试使用 Spring Boot 为 SessionFactory 创建 bean 时，出现无法解析的循环引用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47481631/