Java apache commons dbcp 连接池错误：使用 Spring 事务在 Spring + Hibernate 应用程序中等待空闲对象超时
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时间：2020-08-12 13:25:02 来源:igfitidea点击:
apache commons dbcp connection pool error: Timeout waiting for idle object in a Spring + Hibernate app using Spring Transactions
提问by Dhwanit
I have read through various Stackover flow Questions and contents on the web on similar problem. However, I couldnt find useful hints that would allow me to narrow down on my problem. Here is my usecase which results in this error.
我已经阅读了网络上关于类似问题的各种 Stackover 流程问题和内容。但是，我找不到可以让我缩小问题范围的有用提示。这是我的用例，导致此错误。
2 entities Campus and Programs --> One-to-many relation from Campus to Program and One-to-one from Program to Campus.
i am trying to create multiple programs associated with campuses. Each insert will create a new program with same details and attach it to a different(unique) campus. eg. Java 101 Course offered at New York, San Francisco, Dallas, Chicago will create a new program for each campus.
There is no problem persisting single program. also there is no issue persisting a program for upto 46 campuses but this error shows up for the 47th campus.
2个实体 Campus and Programs --> Campus 到 Program 的一对多关系和 Program 到 Campus 的一对一。
我正在尝试创建与校园相关的多个程序。每个插入将创建一个具有相同细节的新程序并将其附加到不同的（独特的）校园。例如。在纽约、旧金山、达拉斯、芝加哥提供的 Java 101 课程将为每个校区创建一个新程序。
持久化单个程序没有问题。此外，为多达 46 个校区坚持一个程序也没有问题，但是这个错误出现在第 47 个校区。
Here is the config for my application:
这是我的应用程序的配置：
Properties file:
属性文件：
datasource.classname=com.mysql.jdbc.Driver
datasource.url=jdbc:mysql://localhost:3306/edu
datasource.username=xxx
datasource.password=xxx123
datasource.initialsize=15
datasource.maxactive=50
datasource.maxidle=15
datasource.minidle=5
datasource.maxwait=10000
datasource.dialect=org.hibernate.dialect.MySQLDialect
datasource.validationquery =select 1
datasource.minEvictableIdleTimeMillis = 180000
datasource.timeBetweenEvictionRunsMillis = 180000
hibernate.batchsize=30
Here's how my spring-hibernateconfig looks like
这是我的spring-hibernate配置的样子
<context:property-placeholder location="classpath:database.properties" order="1" ignore-unresolvable="true" />
<context:property-placeholder location="classpath:app.properties" order="2" ignore-unresolvable="true" />
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="${datasource.classname}" />
<property name="url" value="${datasource.url}" />
<property name="username" value="${datasource.username}" />
<property name="password" value="${datasource.password}" />
<property name="initialSize" value="${datasource.initialsize}" />
<property name="maxActive" value="${datasource.maxactive}" />
<property name="maxIdle" value="${datasource.maxidle}" />
<property name="minIdle" value="${datasource.minidle}" />
<property name="maxWait" value="${datasource.maxwait}" />
<property name="minEvictableIdleTimeMillis" value="${datasource.minEvictableIdleTimeMillis}" />
<property name="timeBetweenEvictionRunsMillis" value="${datasource.timeBetweenEvictionRunsMillis}" />
<property name="validationQuery" value="${datasource.validationquery}" />
<property name="testOnBorrow" value="true" />
<property name="removeAbandoned" value="true"/>
<property name="removeAbandonedTimeout" value="60"/>
<property name="logAbandoned" value="true"/>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${datasource.dialect}</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.format_sql">true</prop>
<prop key="hibernate.batch_size">${hibernate.batchsize}</prop>
<prop key="hibernate.current_session_context_class">org.springframework.orm.hibernate3.SpringSessionContext</prop>
<prop key="hibernate.cache.use_second_level_cache">true</prop>
<prop key="hibernate.cache.use_query_cache">true</prop>
<prop key="hibernate.cache.provider_configuration_file_resource_path">/WEB-INF/ehcache-entity.xml</prop>
<prop key="hibernate.cache.region.factory_class">net.sf.ehcache.hibernate.EhCacheRegionFactory</prop>
<prop key="hibernate.generate_statistics">false</prop>
<!-- <prop key="hibernate.connection.release_mode">auto</prop> -->
</props>
</property>
<property name="packagesToScan">
<list>
<value>com.edapp.core</value>
<value>com.edapp.data.engine</value>
<value>com.edapp.service.engine</value>
</list>
</property>
</bean>
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<aop:config proxy-target-class="true"/> <!-- necessary to call methods on classes than proxies -->
<context:annotation-config />
<context:component-scan base-package="com.edapp" />
<!-- transaction settings -->
<tx:annotation-driven transaction-manager="transactionManager" />
Here's how my application flow looks like
这是我的应用程序流程的样子
ProgramController -> ProgramService -> ProgramDAO
ProgramController -> ProgramService -> ProgramDAO
Service class is annotated with:@Transactional(propagation=Propagation.REQUIRED, isolation=Isolation.READ_COMMITTED)
服务类注释为：@Transactional(propagation=Propagation.REQUIRED, isolation=Isolation.READ_COMMITTED)
DAO class is annotated with:@Transactional(propagation=Propagation.MANDATORY, isolation=Isolation.READ_COMMITTED)
DAO 类注释为：@Transactional(propagation=Propagation.MANDATORY, isolation=Isolation.READ_COMMITTED)
Here's the piece from Controller
这是控制器的作品
List<String> campuses = Arrays.asList(gson.fromJson(campusesJSArray, String[].class));
if(campuses.size() > 0){
List<Program> programList = new ArrayList<Program>();
AreaOfStudy aos = this.areaOfStudyService.getById(areaOfStudyId);
Concentration con = this.concentrationService.getById(concentrationId);
for(String c : campuses){
Long campusid = Long.parseLong(c);
Program p = new Program();
Campus campus = this.campusService.getById(campusid);
if(campus != null){
System.out.println(campus.toString());
p.setName(name);
p.setCampus(campus);
p.setCode(code);
p.setLevel(level);
p.getCampus().getPrograms().add(p);
p.setAreaOfStudy(aos);
p.setConcentration(con);
p.setActive(true);
}
programList.add(p);
}
((ProgramServiceImpl)programService).saveOrUpdate(programList);
Here's a snippet from Service
这是服务的片段
if(programList == null){
log.error("ProgramList cannot be null");
return null;
}
Map<Integer, String> errors = new HashMap<Integer, String>();
log.info("Saving program list of size:"+programList.size());
for(int i=0; i<programList.size();i++){
try{
this.saveOrUpdate(programList.get(i));
}catch(HibernateException e){
errors.put(i, "error");
}
}
return errors;
Here's a snippet from the DAO:
这是 DAO 的一个片段：
@Transactional(isolation=Isolation.REPEATABLE_READ)
public void create(final T entity) {
if(entity == null){
IllegalArgumentException e = new IllegalArgumentException();
throw(e);
}
Session session = this.sessionFactory.getCurrentSession();
try{
session.persist(entity);
session.flush();
}catch(ConstraintViolationException cve){
log.error("School with same code already exists "+ this.clazz.getName(),cve);
throw cve;
}catch(HibernateException e){
log.error("Error persisting entity of type "+ this.clazz.getName(),e);
throw new HibernateException(e);
}finally{
session.clear();
}
}
Batchsize = 30
批量= 30
@Transactional(isolation=Isolation.REPEATABLE_READ)
public void create(List<T> entityList){
if(entityList == null){
IllegalArgumentException e = new IllegalArgumentException();
throw(e);
}
Session session = this.sessionFactory.getCurrentSession();
try{
for(int i=0;i<entityList.size();i++){
T entity = entityList.get(i);
if(entity == null){
log.error("List "+ this.clazz.getName() + " of cannot contain null");
throw new NullPointerException("List "+ this.clazz.getName() + " of cannot contain null");
}
session.persist(entity);
if(i% this.batchSize == 0){
session.flush();
session.clear();
}
}
}catch(HibernateException e){
log.error("Error persisting entity of type "+ this.clazz.getName(),e);
throw new HibernateException(e);
}finally{
session.flush();
session.clear();
}
}
tried using both methods to persist but same outcome.
尝试使用这两种方法来坚持，但结果相同。
Here is the full stack trace
这是完整的堆栈跟踪
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Cannot open connection
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:932)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:233)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
root cause
org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Cannot open connection
org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:597)
org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:372)
org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:329)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:631)
com.tr.leadgen.service.engine.CampusServiceImpl$$EnhancerByCGLIB$d579ad.getById(<generated>)
com.tr.leadgen.web.edu.controllers.ProgramController.add(ProgramController.java:74)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:920)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:233)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
root cause
org.hibernate.exception.GenericJDBCException: Cannot open connection
org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140)
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52)
org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449)
org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:160)
org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:81)
org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1473)
org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:556)
org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:372)
org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:329)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:631)
com.tr.leadgen.service.engine.CampusServiceImpl$$EnhancerByCGLIB$d579ad.getById(<generated>)
com.tr.leadgen.web.edu.controllers.ProgramController.add(ProgramController.java:74)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:920)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:233)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
root cause
org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, pool error Timeout waiting for idle object
org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:114)
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:83)
org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:160)
org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:81)
org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1473)
org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:556)
org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:372)
org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:329)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:631)
com.tr.leadgen.service.engine.CampusServiceImpl$$EnhancerByCGLIB$d579ad.getById(<generated>)
com.tr.leadgen.web.edu.controllers.ProgramController.add(ProgramController.java:74)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:920)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:233)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
root cause
java.util.NoSuchElementException: Timeout waiting for idle object
org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1174)
org.apache.commons.dbcp.AbandonedObjectPool.borrowObject(AbandonedObjectPool.java:79)
org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:106)
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:83)
org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:160)
org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:81)
org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1473)
org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:556)
org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:372)
org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:329)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:631)
com.tr.leadgen.service.engine.CampusServiceImpl$$EnhancerByCGLIB$d579ad.getById(<generated>)
com.tr.leadgen.web.edu.controllers.ProgramController.add(ProgramController.java:74)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:920)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:233)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
This is the only way I get session from hibernate:
这是我从休眠中获取会话的唯一方法：
@Transactional(propagation=Propagation.NOT_SUPPORTED)
protected Session getCurrentSession(){
if(this.sessionFactory == null){
log.error("SessionFactory is null");
}
return this.sessionFactory.getCurrentSession();
}
}
Also per my app logs, code execution does not make it to service layer. It throws an error while looping in the controller to populate the list of program entites (refer controller snippet)
同样根据我的应用程序日志，代码执行不会进入服务层。在控制器中循环以填充程序实体列表时会引发错误（请参阅控制器代码段）
I would be thankful if anyone can point me in the right direction.
如果有人能指出我正确的方向，我将不胜感激。
回答by gerrytan
I see you had a pool setting which validates connection on borrow, and from the stack trace I can see this validation failed (seem to timeout). There are 2 possible causes I can think of:
我看到你有一个池设置来验证借用连接，从堆栈跟踪我可以看到这个验证失败（似乎超时）。我能想到的原因有两个：
Network connection between your app and db server was broken. This could be due to connection lost, firewall setting change, stale DNS entries, db server suddenly dies, or even router had a setting to kill suspicious tcp socket (happened to us once)
The pool run out of available connection. This is rather unlikely because I'd assume the stack trace would give more hint, but it's worth monitoring your pool and check the number of available conn at the time when problem occur
您的应用程序和数据库服务器之间的网络连接中断。这可能是由于连接丢失、防火墙设置更改、DNS 条目陈旧、数据库服务器突然死机，甚至路由器设置了杀死可疑 tcp 套接字的设置（我们曾经发生过一次）
池用完可用连接。这是不太可能的，因为我认为堆栈跟踪会提供更多提示，但是值得监视您的池并在问题发生时检查可用连接的数量
回答by oVo
I ran into a similar error today.
我今天遇到了类似的错误。
I have a similar setting: "datasource.maxactive=50", which means no more than 50 connections at a time. I have n threads, each uses a connection. When n is 50 or close, this exception happens a lot. There are a few things that can be done; 2 that I found helpful:
我有一个类似的设置：“datasource.maxactive=50”，这意味着一次不超过 50 个连接。我有 n 个线程，每个线程都使用一个连接。当 n 为 50 或接近时，这种异常会发生很多。有几件事可以做；2 我觉得有帮助的：
- Adjust n to be smaller
- Retry with proper back-off
- 将 n 调整得更小
- 使用适当的回退重试
From what I see, both of these give the pool time to recollect connections and reduces the timeout.
从我所见，这两者都为池提供了重新收集连接的时间并减少了超时。
回答by MukeshKoshyM
I had the same issue as we had ramp up on the usage of application. Increased the connection pool and issue got resolved.
我遇到了与我们增加应用程序使用量相同的问题。增加了连接池并解决了问题。
