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解决Exception：Could not open Hibernate Session for transaction; nested exception is java.lang.NoClassDefFoundError: org/hibernate/engine/transaction/spi/TransactionContext
解决Could not open Hibernate Session for transaction; nested exception is java.lang.NoClassDefFoundError: org/hibernate/engine/transaction/spi/TransactionContext
关于Hibernate Could not obtain transaction-synchronized Session for current thread
Could not open Hibernate Session for transaction; nested exception is org.hibernate.TransactionExcep linux下mysql修改连接超时wait_timeout修改后就ok了
org.hibernate.HibernateException: Could not obtain transaction-synchronized Session for current thread
Could not open JPA EntityManager for transaction; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: Cannot open connection
org.springframework.transaction.CannotCreateTransactionException Could not open
SSH项目过一段时间之后再访问会报一次Could not open Hibernate session for transaction 异常，Caused by: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlyi，再重新方法即可访问成功（通常出现在过了一晚之后再去访问系统）
[springboot jpa] [bug] Could not open JPA EntityManager for transaction
解决Hibernate：could not initialize proxy - no Session