如果您对session.connection和在Hibernate上已弃用？感兴趣，那么这篇文章一定是您不可错过的。我们将详细讲解session.connection的各种细节，并对在Hibernat
如果您对session.connection和在Hibernate上已弃用？感兴趣，那么这篇文章一定是您不可错过的。我们将详细讲解session.connection的各种细节，并对在Hibernate上已弃用？进行深入的分析，此外还有关于Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when ...、ClassNotFoundException：组织hibernate.collection.PersistentSet + Hibernate 5.4、Connection cannot be null when ''hibernate.dialect''、Could not open Hibernate Session for transaction; nested exception is org.hibernate.TransactionEx...的实用技巧。
本文目录一览：- session.connection（）在Hibernate上已弃用？（session connection）
- Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when ...
- ClassNotFoundException：组织hibernate.collection.PersistentSet + Hibernate 5.4
- Connection cannot be null when ''hibernate.dialect''
- Could not open Hibernate Session for transaction; nested exception is org.hibernate.TransactionEx...
session.connection（）在Hibernate上已弃用？（session connection）
我们需要能够获得java.sql.Connectionhibernate会话的关联。没有其他连接可用，因为此连接可能与正在运行的事务关联。
如果现在不建议使用session.connection（），我应该怎么做？
答案1
小编典典现在，您必须使用Work API：
session.doWork( new Work() { public void execute(Connection connection) throws SQLException { doSomething(connection); } });或者，在Java 8+中：
session.doWork(connection -> doSomething(connection));
Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when ...
java.lang.IllegalStateException: Failed to load ApplicationContext
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:125)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:108)
at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:190)
at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:132)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:246)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ''entityManagerFactory'' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1778)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1105)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:312)
at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:120)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117)
... 24 more
Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:275)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214)
at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.injectServices(DefaultIdentifierGeneratorFactory.java:152)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.injectDependencies(AbstractServiceRegistryImpl.java:286)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:243)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214)
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.<init>(InFlightMetadataCollectorImpl.java:179)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:119)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:904)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:935)
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:390)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1837)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1774)
... 39 more
Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when ''hibernate.dialect'' not set
at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:100)
at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:54)
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:137)
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:94)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263)
... 56 more第一次使用 springboot+jpa 进行操作数据库，刚启动就爆出来异常:
应该在 yml 配置文件中加上:
spring:
jpa:
show-sql: true
hibernate:
ddl-auto: create
database-platform: org.hibernate.dialect.PostgreSQLDialect
ClassNotFoundException：组织hibernate.collection.PersistentSet + Hibernate 5.4
如何解决ClassNotFoundException：组织hibernate.collection.PersistentSet + Hibernate 5.4？
我们正在从3级迁移到5.4版。进行所有更改后，模块运行正常，因此我合并了其他修复程序的代码。
发布此消息后，我收到一些正在处理的消息的奇怪异常。
试图找出根本原因，但无法找出为什么要引用休眠3类。。我们发送的对象具有一对多关系
我们的应用程序正在从JMS队列中读取消息，在下面，尽管没有使用过此类，但它引发了异常
Serializable obj =((ObjectMessage) message).getobject()
例外：抱歉，无法添加整个跟踪
Weblogic.jms.common.JMSException[JMSClientExceptions:055115]Error deserializing an object
.
.
.
Caused By: java.lang.classNotFoundException: org hibernate.collection.PersistentSet
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。
小编邮箱:dio#foxmail.com (将#修改为@）
Connection cannot be null when ''hibernate.dialect''
使用 hibernate4 时，配置文件里明明配了 <property name="dialect">org.hibernate.dialect.MySQLDialect</property>，运行时就是报错 Connection cannot be null when ''hibernate.dialect'' not set；
后来在网上发现：
错误在于以下红色代码：
static{
try{
Configuration config = new Configuration();
config.addClass(ProductInfoVo.class);
sessionFactory = config.buildSessionFactory();
}catch(MappingException e){
e.printStackTrace();
}catch(HibernateException e){
e.printStackTrace();
}
}
以上代码只有按下面写才对：
static{
try{
Configuration config = new Configuration().configure();
config.addClass(ProductInfoVo.class);
sessionFactory = config.buildSessionFactory();
}catch(MappingException e){
e.printStackTrace();
}catch(HibernateException e){
e.printStackTrace();
}
}
Could not open Hibernate Session for transaction; nested exception is org.hibernate.TransactionEx...
Linux下mysql修改连接超时wait_timeout
1,首先：
show variables like ''%timeout%''；
显示结果：
+-----------------------------+----------+
| Variable_name | Value |
+-----------------------------+----------+
| connect_timeout | 10 |
| delayed_insert_timeout | 300 |
| innodb_flush_log_at_timeout | 1 |
| innodb_lock_wait_timeout | 50 |
| innodb_rollback_on_timeout | OFF |
| interactive_timeout | 28800 |
| lock_wait_timeout | 31536000 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| rpl_stop_slave_timeout | 31536000 |
| slave_net_timeout | 3600 |
| wait_timeout | 28800 |
+-----------------------------+----------+
12 rows in set (0.00 sec)
其中有用的是： interactive_timeout 和wait_timeout 为28800，默认为8小时设置；
一般线上的环境中mysql中连接时间设置为7天即可；
2,其次：
执行命令： set interactive_timeout=604800；
set wait_timeout=604800；
最后：执行show variables like ''%timeout%''；看看执行成功没有，显示结果为：
+-----------------------------+----------+
| Variable_name | Value |
+-----------------------------+----------+
| connect_timeout | 10 |
| delayed_insert_timeout | 300 |
| innodb_flush_log_at_timeout | 1 |
| innodb_lock_wait_timeout | 50 |
| innodb_rollback_on_timeout | OFF |
| interactive_timeout | 604800 |
| lock_wait_timeout | 31536000 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| rpl_stop_slave_timeout | 31536000 |
| slave_net_timeout | 3600 |
| wait_timeout | 604800 |
+-----------------------------+----------+
12 rows in set (0.00 sec)
表明执行成功了。。。
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