org.hibernate.LazyInitializationException: could not initialize proxy - no Session

最新推荐文章于 2022-03-17 22:59:53 发布

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最新推荐文章于 2022-03-17 22:59:53 发布

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分类专栏：错误集文章标签： org.hibernate.LazyInitializationExc

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本文详细解析了Hibernate中LazyInitializationException异常的产生原因，通常发生在尝试访问延迟加载属性时session已关闭的情况。提供了两种解决方案：一是通过@JsonIgnoreProperties注解忽略特定属性；二是在web.xml中配置OpenEntityManagerInViewFilter过滤器，确保在整个请求期间保持EntityManager打开。

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org.hibernate.LazyInitializationException: could not initialize proxy - no Session

完成的错误为

org.hibernate.LazyInitializationException: could not initialize proxy - no Session
	at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:165)
	at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:286)
	at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:185)
	at wltyx.nyybw.aisell.domain.Department_$$_jvst573_0.toString(Department_$$_jvst573_0.java)
	at java.lang.String.valueOf(String.java:2994)
	at java.io.PrintStream.println(PrintStream.java:821)
	at org.apache.tomcat.util.log.SystemLogHandler.println(SystemLogHandler.java:267)
	at wltyx.nyybw.aisell.web.controller.EmployeeController.lambda$datagrid$0(EmployeeController.java:32)
	at java.lang.Iterable.forEach(Iterable.java:75)
	at wltyx.nyybw.aisell.web.controller.EmployeeController.datagrid(EmployeeController.java:32)
	at sun.reflect.GeneratedMethodAccessor50.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:817)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:731)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:968)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:870)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:844)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
	at org.apache.catalina.core.StandardContextValve.__invoke(StandardContextValve.java:94)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1156)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2527)
	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2516)
	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)

Hibernate使用sessionFactory来管理session，每进行一次数据库操作时都会新建一个session对象，当操作完成后，hibernate就会在dao层立即关闭该session。所以操作类中另一个类的具体属性时，因为session已经关闭，就会报错。

解决方法：

在类上加属性：生成的时候把这个字段忽略了：
@JsonIgnoreProperties(value={“hibernateLazyInitializer”,“handler”,“fieldHandler”})

在web.xml加上下面内容

 <!-- 解决no-session的问题 -->
  <filter>
    <filter-name>openEntityManager</filter-name>
    <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>openEntityManager</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>