客户端尝试检出连接已超时 [英] An attempt by a client to checkout a Connection has timed out
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问题描述
请，有人可以帮忙吗?我正在尝试运行该应用程序，但始终出现此错误.有人有类似的问题吗?正在运行gradle应用
Please, can someone help? I am trying to run the application but it keeps getting this error. Did someone have a similar problem? Running gradle app
2019-01-07 23:29:19.827 WARN 4450 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'liquibase' defined in class path resource [com/wikbit/configuration/LiquibaseConfiguration.class]: Invocation of init method failed; nested exception is liquibase.exception.DatabaseException: java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
2019-01-07 23:29:19.844 INFO 4450 --- [ main] o.e.jetty.server.handler.ContextHandler : Stopped o.s.b.c.e.j.JettyEmbeddedWebAppContext@864d4d{/,file:/tmp/jetty-docbase.1621285029316441126.8080/,UNAVAILABLE}
2019-01-07 23:29:19.856 ERROR 4450 --- [ main] o.s.boot.SpringApplication : Application startup failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'liquibase' defined in class path resource [com/wikbit/configuration/LiquibaseConfiguration.class]: Invocation of init method failed; nested exception is liquibase.exception.DatabaseException: java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1578) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) ~[spring-context-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) ~[spring-context-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
at com.wikbit.BachelorThesisApplication.main(BachelorThesisApplication.java:16) [classes/:na]
Caused by: liquibase.exception.DatabaseException: java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
at liquibase.integration.spring.SpringLiquibase.afterPropertiesSet(SpringLiquibase.java:390) ~[liquibase-core-3.5.3.jar:na]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
... 16 common frames omitted
Caused by: java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118) ~[mchange-commons-java-0.2.3.4.jar:na]
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:77) ~[mchange-commons-java-0.2.3.4.jar:na]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:687) ~[c3p0-0.9.2.1.jar:0.9.2.1]
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140) ~[c3p0-0.9.2.1.jar:0.9.2.1]
at liquibase.integration.spring.SpringLiquibase.afterPropertiesSet(SpringLiquibase.java:385) ~[liquibase-core-3.5.3.jar:na]
... 18 common frames omitted
Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool@1d389f2 -- timeout at awaitAvailable()
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1416) ~[c3p0-0.9.2.1.jar:0.9.2.1]
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:606) ~[c3p0-0.9.2.1.jar:0.9.2.1]
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:526) ~[c3p0-0.9.2.1.jar:0.9.2.1]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:755) ~[c3p0-0.9.2.1.jar:0.9.2.1]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:682) ~[c3p0-0.9.2.1.jar:0.9.2.1]
... 20 common frames omitted
我下载了应用程序，需要将其用于某些研究.我为别人工作，而不是为我工作
I downloaded app and need to use it for some research. I works for others, not for me
推荐答案
超时错误通常是不是由应用程序本身引起的错误-这是与SQL数据库连接的问题.
Timeout errors are typically an error not caused by your application itself - it's a problem with the connection to the SQL database.
如果您在本地处理DB，则可以检查超时设置并进行修改，以应对请求调用中的延迟.
If you are working on the DB locally, then you can check the timeout settings and modify them in order to cope with the delay in the request calls.
如果您正在使用远程数据库m/c，则需要保持一致的连接.如果不确定如何保持与计算机到数据库服务器的连接一致，请编写一个简单的批处理脚本，该脚本对数据库服务器执行ping操作，并使连接保持活动状态，以便您的应用程序发送请求.
If you are working on a remote DB m/c, then maintaining a consistent Connection is needed. If you are unsure about how to keep the connection consistent with your machine to the DB machine, then write a simple batch script which pings the DB server and keeps the Connection alive for your application to send a request.
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