Spring Data JPA使用getOne方法報錯:Method threw 'org.hibernate.LazyInitializationException' exception. Cannot evaluate
getOne是懶加載,需要增加這個配置: spring.jpa.properties.hibernate.enable_lazy_load_no_trans=true,但這種方式不太友好,建議不要使用。
解釋:https://vladmihalcea.com/2016...
每次初始化一個實體的關聯就會創建一個臨時的session來加載,每個臨時的session都會獲取一個臨時的數據庫連接,開啟一個新的事物。這就導致對底層連接池壓力很大,而且事物日誌也會被每次flush.
設想一下:假如我們查詢了一個分頁list每次查出1000條,這個實體有三個lazy關聯對象,那麽,恭喜你,你至少需要創建3000個臨時session+connection+transaction.
參考:
https://segmentfault.com/q/1010000012794754
https://segmentfault.com/a/1190000009150966(以上部分內容轉自此篇文章)
Spring Data JPA使用getOne方法報錯:Method threw 'org.hibernate.LazyInitializationException' exception. Cannot evaluate
相關推薦
Spring Data JPA使用getOne方法報錯:Method threw 39;org.hibernate.LazyInitializationException39; exception. Cannot evaluate
com tps 對象 vlad 解釋 連接 method 需要 至少 getOne是懶加載,需要增加這個配置: spring.jpa.properties.hibernate.enable_lazy_load_no_trans=true,但這種方式不太友好,建議不要使用。
Spring AOP表達式報錯:Pointcut is not well-formed: expecting 39;name pattern39; at character position
ret reg tin lips aspect lock alua depend internal 問題現象: java.lang.IllegalStateException: Failed to load ApplicationContext at org.
tomcat啟動報錯:java.lang.ClassCastException: org.apache.jasper.runtime.ELContextImpl cannot be cast to..
啟動tomcat的專案報錯如下: 解決思路: 1.看到這個錯誤,java.lang.ClassCastException: org.apache.jasper.runtime.ELContextImpl cannot be cast to org.apache.jasper.el.ELC
spring pom文件報錯:提示no declaration can be found for element 39;dubbo:service39;.
net 技術 found cnblogs 點擊 找到 inf 提示 src 轉自:http://blog.csdn.net/happylife_haha/article/details/52755425 pom文件報錯:The matching wildcard is st
dubbo spring pom文件報錯:提示no declaration can be found for element 39;dubbo:service39;.
valid windows validate tex file lib window win fcm pom文件報錯:The matching wildcard is strict, but no declaration can be found for element
使用seek()方法報錯:“io.UnsupportedOperation: can39;t do nonzero cur-relative seeks”錯誤的原因
pac nbsp mar std orm ack logs 打開文件 off 在使用seek()函數時,有時候會報錯為 “io.UnsupportedOperation: can‘t do nonzero cur-relative seeks”,代碼如下: >&g
spring MVC 報錯:java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet
重新 chain http1 accesslog instance report ppc springmvc bstr 嚴重: Allocate exception for servlet SpringMVCjava.lang.ClassNotFoundExceptio
【spring boot Mybatis】報錯:org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.newhope.interview.dao.UserMapper.add
使用 ase err abstract internal tin mic pre uestc 報錯如下: org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): c
laravel --報錯: Method varchar does not exist.
span HA pan font bubuko 原因 style arch ima 原因如下:遷移文件中,數據類型不能用 varchar。 必須改成 char。laravel --報錯: Method varchar does not exist.
spring測試save方法報錯
leg clas creat ould seq save eth val ble 用test類測試service的save方法時,報錯如下: 2018-08-24 21:52:13,506 - could not read a hi value com.mysql.jdb
菜鳥調錯——Spring Boo+JPA方式報錯:MappingException: Could not get constructor for org.hibernate.persister
文章目錄 錯誤資訊 軟體版本 錯誤背景 前提 推理 可能遇到的一些問題 結束 錯誤資訊 018-10-04 15:58:02.540 ERROR 4572 --- [ main] o.s
vue sort()方法報錯:“You may have an infinite update loop in a component”
html <div class="box" v-for="(item,itemindex) in itemrank" :key="itemindex"> <div class="box-title" > <div class="t
Spring AOP表示式報錯:Pointcut is not well-formed: expecting 39;name pattern39; at character position
問題現象: java.lang.IllegalStateException: Failed to load ApplicationContext at org.springframework.test.context.cache.DefaultCacheAwareContextLoader
呼叫os.fork()方法報錯:AttributeError: module 39;os39; has no attribute 39;fork39;
錯誤棧: Traceback (most recent call last): File “D:/Users/qc/PycharmProjects/day20/duoxiancheng/duoxiancheng.py”, line 5, in pid = os.fork() Attr
解決C#中呼叫WCF方法報錯:遠端伺服器返回錯誤 (404) 未找到
IIS配置問題,解決方法: 1. 首先新增MIME型別 副檔名“.svc”,MIME型別 “application/octet-stream” 2、處理程式對映--新增託管處理程式 請求路徑 “.svc” 型別 “System.ServiceModel.Activation.HttpH
菜鳥調錯(十二)——Spring Boo+JPA方式報錯:MappingException: Could not get constructor for org.hibernate.persister
文章目錄錯誤資訊軟體版本錯誤背景前提推理結束 錯誤資訊 018-10-04 15:58:02.540 ERROR 4572 --- [ main] o.s.boot.SpringApplication Application run failed org.s
python seek()方法報錯:“io.UnsupportedOperation: can39;t do nonzero cur-relative seeks”
今天使用seek()時報錯了, 看下圖 然後就百度了一下,找到了解決方法 這篇部落格https://www.cnblogs.com/xisheng/p/7636736.html 幫忙解決了問題, 照理說,按照seek()方法的
啟動Spring boot註冊中心報錯:RENEWALS ARE LESSER THAN THE THRESHOLD. THE SELF PRESERVATION MODE IS TURNED OFF
服務提供者和服務消費者配置檔案問題: eureka.client.service-url.defaultZone= http://localhost:8080/eureka/ 問題:LoginService.loginTest: com.netflix.cl
Spring Boot連線MySQL8報錯:java.sql.SQLException: Unknown system variable 'tx_isolation'
報錯資訊:java.sql.SQLException: Unknown system variable 'tx_isolation'at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:964) ~[mysql
eclipse專案中request.getLocalPort()方法報錯:
eclipse專案編譯報錯The method getLocalPort() is undefined for the type HttpServletRequest 原因及解決辦法: j2ee.jar包中的servlet版本或者是jboss中的servle