我正在运行Spring Boot应用程序来创建REST api。我经常收到错误,说数据库连接已关闭,之后我无法调用该应用程序。我使用的是Postgres DB。这是完整的堆栈跟踪:
org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is javax.persistence.PersistenceException: org.hibernate.TransactionException: JDBC begin transaction failed:
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:431)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373)
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:457)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:276)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy91.findByUriMoniker(Unknown Source)
at com.mypkg.businessobjects.OrderInfoBO.getOrderInfo(OrderInfoBO.java:76)
at com.mypkg.controller.OrderInfoController.getOrderInfo(OrderInfoController.java:78)
at sun.reflect.GeneratedMethodAccessor104.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:777)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:130)
at com.mypkg.config.CORSFilter.doFilter(CORSFilter.java:39)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:132)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:132)
at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:85)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:56)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:63)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70)
at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:261)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:247)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:76)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:166)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:197)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:759)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.persistence.PersistenceException: org.hibernate.TransactionException: JDBC begin transaction failed:
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1763)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1677)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:1771)
at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:64)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:159)
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:380)
... 56 more
Caused by: org.hibernate.TransactionException: JDBC begin transaction failed:
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:76)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:162)
at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1435)
at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:61)
... 58 more
Caused by: org.postgresql.util.PSQLException: This connection has been closed.
at org.postgresql.jdbc2.AbstractJdbc2Connection.checkClosed(AbstractJdbc2Connection.java:833)
at org.postgresql.jdbc2.AbstractJdbc2Connection.getAutoCommit(AbstractJdbc2Connection.java:794)
at sun.reflect.GeneratedMethodAccessor35.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.apache.tomcat.jdbc.pool.ProxyConnection.invoke(ProxyConnection.java:126)
at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:108)
at org.apache.tomcat.jdbc.pool.DisposableConnectionFacade.invoke(DisposableConnectionFacade.java:81)
at com.sun.proxy.$Proxy56.getAutoCommit(Unknown Source)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:68)
... 61 more
当我重新启动应用程序时,它会消失。我认为当我重新启动postgres DB时会出现此问题。为什么会这样?
答案 0 :(得分:25)
这是其他帖子的半回答,我想非常明确。我也希望更多的是Spring-Boot-esque。如有必要,请随时更改时间间隔。
选项1:从池中删除断开的连接。
使用以下属性:
spring.datasource.test-on-borrow=true
spring.datasource.validation-query=SELECT 1;
spring.datasource.validation-interval=30000
选项2:保持池中的连接活跃。
使用以下属性:
spring.datasource.test-while-idle=true
spring.datasource.validation-query=SELECT 1;
spring.datasource.time-between-eviction-runs-millis=60000
选项3:主动抛弃空闲连接。
使用这些属性(注意:我无法在Spring Boot上找到关于这个属性的可靠文档。此外,超时是以秒为单位而不是毫秒):
spring.datasource.remove-abandoned=true
spring.datasource.remove-abandoned-timeout=60
快乐启动!
答案 1 :(得分:10)
非常有效的问题,这个问题通常面临很多问题。当池和数据库之间的网络连接丢失时(通常由于重新启动),通常会发生异常。查看您指定的堆栈跟踪,很明显您使用jdbc pool
来获取连接。 JDBC pool
可以选择微调各种连接池设置,并记录有关池内发生的内容的详细信息。
您可以参考detailed apache documentation on pool configuration指定放弃超时
检查removeAbandoned,removeAbandonedTimeout,logAbandoned参数
此外,您可以使用其他属性来进一步加强验证
使用testXXX和validationQuery获得连接有效性。
答案 2 :(得分:1)
我遇到完全相同的问题,with this setup,也使用DataSource from Tomcat(org.apache.tomcat.jdbc.pool
)连接到Heroku Postgres:
org.springframework.transaction.CannotCreateTransactionException:
Could not open JPA EntityManager for transaction
org.hibernate.TransactionException: JDBC begin transaction failed: ]
with root cause
org.postgresql.util.PSQLException: This connection has been closed.
为我解决的是将其添加到DataSource初始化代码(从a Grails question借用):
dataSource.setTestOnBorrow(true);
dataSource.setTestWhileIdle(true);
dataSource.setTestOnReturn(true);
dataSource.setValidationQuery("SELECT 1");
我不确定是否需要所有这三个来获得稳定的连接 - 也许不是 - 但是所有启用它可能不会造成太大伤害。
JavaDocs澄清了正在发生的事情:例如, setTestOnBorrow()
。也许有点令人惊讶的是,默认情况下没有进行这样的测试。
答案 3 :(得分:0)
我有完全相同的问题但在我的情况下前面提到的答案没有帮助。我发现在进行长查询时会出现相同的错误。在我的情况下,我调用了findAll(Iterable ids)并传递了超过100'000个ID的巨大列表。对列表进行分区(例如,使用来自Apache Commons或Google Guava的ListUtils)并使用较少的ID调用findAll()就可以了。
答案 4 :(得分:0)
此异常基本上表明JDBC连接已关闭,但这并不意味着 数据库服务器未运行(还有另一个例外)。重新启动数据库服务器时可能会发生这种情况 或在数据库服务器断开连接后(例如,由于超时)。 因此,这里的问题是,为什么应用程序不根据新的HTTP请求重新连接到服务器。
通常这是连接池的错误配置,每次应用程序应验证连接 “借”一次。解决此问题所需要做的只是以下几点:
spring.datasource.validation-query=SELECT 1;
spring.datasource.test-on-borrow=true
其他配置参数(从其他答案中得出)是对该异常严格要求的优化。
但是有时即使正确配置了JDBC池,也可能存在某些应用程序错误,其中应用程序保持数据库连接 不会在HTTP请求结束后将其返回到JDBC池。 因此,JDBC池甚至没有可能验证数据库连接(它只知道数据库连接为“已分配”)。 此处的一般解决方案是确保应用程序返回连接,并在每个HTTP请求上“借用”新连接。
此类错误的一个示例:
@Component
public MyService {
@Resource
private EntityManagerFactory emf;
private EntityManager em;
public MyService() {
em = emf.createEntityManager();//em never return back its JDBC connection to the pool (using em.close())
}
}
针对上述错误的解决方案是使用注入/托管的EntityManager(首选)
@Component
public MyService {
@PersistenceContext
private EntityManager em;
}
或者如果您真的需要管理它,请为每个HTTP请求创建一个EntityManager,并在尝试最终阻止的情况下将其关闭
@Component
public MyService {
@Resource
private EntityManagerFactory emf;
private EntityManager em;
public void myMethod() {
EntityManager em = emf.createEntityManager();
try {
} finaly {
em.close();//do not forget other cleanup operations like rolling back the transaction
}
}
}
答案 5 :(得分:0)
当您在存储库中编写查询时,请尝试将 @Repository 注释保留在存储库中