我使用tomcat连接池使用gradle运行Spring-Boot。所有标准的spring-boot-tools。我在该Web服务器上运行了几个soap-
webservices。测试服务器负载时，一切正常。但是在约7.5小时不执行任何操作后，将发生此异常。当然可以，timeout但是我尝试通过以下方法防止它：

• spring.datasource.url=jdbc:postgresql://mydb?autoReconnect=true
• 我使用@transactional某些陈述。但通常我只使用JPA-Repositoryspring-boot中的from。
• 这些连接由tomcat-connection-pool管理，因此没有空闲连接问题。
• 当我重新启动应用程序服务器时，一切再次正常运行。

我的数据库服务器正在运行，PostgreSQL 9.4.1 on x86_64-unknown-linux- gnu并且数据库与应用程序服务器之间没有防火墙。

为什么我的连接在一定时间后会断开并且无法恢复？

我的应用程序属性：

#
# [ Database Configuration Section ]
#
spring.jpa.database=POSTGRESQL
spring.jpa.show-sql=false
hibernate.format_sql=true
hibernate.hbm2ddl.auto=validate
spring.jpa.hibernate.naming-strategy=org.hibernate.cfg.DefaultNamingStrategy

spring.datasource.platform=postgres
spring.database.driverClassName=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://*****:5434/******
spring.datasource.username=*****
spring.datasource.password=*****

logging.file=*******.log
logging.level.=WARNING

2015-09-29 11:58:50.598  INFO 10498 --- [nio-9092-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring FrameworkServlet 'dispatcherServlet'
2015-09-29 11:58:50.598  INFO 10498 --- [nio-9092-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started
2015-09-29 11:58:50.674  INFO 10498 --- [nio-9092-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 76 ms

2015-09-29 19:23:03.777  WARN 10498 --- [ool-3-thread-16] o.h.engine.jdbc.spi.SqlExceptionHelper   : SQL Error: 0, SQLState: 08006
2015-09-29 19:23:03.779 ERROR 10498 --- [ool-3-thread-16] o.h.engine.jdbc.spi.SqlExceptionHelper   : An I/O error occurred while sending to the backend.
2015-09-29 19:23:03.785  INFO 10498 --- [ool-3-thread-16] o.h.e.j.b.internal.AbstractBatchImpl     : HHH000010: On release of batch it still contained JDBC statements
2015-09-29 19:23:03.836 ERROR 10498 --- [ool-3-thread-16] o.s.orm.jpa.JpaTransactionManager        : Commit exception overridden by rollback exception
java.net.SocketException: Connection timed out
    at java.net.SocketInputStream.socketRead0(Native Method) ~[na:1.8.0_25]
    at java.net.SocketInputStream.read(SocketInputStream.java:150) ~[na:1.8.0_25]
    at java.net.SocketInputStream.read(SocketInputStream.java:121) ~[na:1.8.0_25]
    at org.postgresql.core.VisibleBufferedInputStream.readMore(VisibleBufferedInputStream.java:143) ~[postgresql-9.4-1202-jdbc41.jar!/:9.4]
    at org.postgresql.core.VisibleBufferedInputStream.ensureBytes(VisibleBufferedInputStream.java:112) ~[postgresql-9.4-1202-jdbc41.jar!/:9.4]
    at org.postgresql.core.VisibleBufferedInputStream.read(VisibleBufferedInputStream.java:71) ~[postgresql-9.4-1202-jdbc41.jar!/:9.4]
    at org.postgresql.core.PGStream.ReceiveChar(PGStream.java:282) ~[postgresql-9.4-1202-jdbc41.jar!/:9.4]
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1718) ~[postgresql-9.4-1202-jdbc41.jar!/:9.4]
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:173) ~[postgresql-9.4-1202-jdbc41.jar!/:9.4]
    ... 61 common frames omitted
Wrapped by: org.postgresql.util.PSQLException: An I/O error occurred while sending to the backend.
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:201) ~[postgresql-9.4-1202-jdbc41.jar!/:9.4]
    at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:615) ~[postgresql-9.4-1202-jdbc41.jar!/:9.4]
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:465) ~[postgresql-9.4-1202-jdbc41.jar!/:9.4]
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:411) ~[postgresql-9.4-1202-jdbc41.jar!/:9.4]
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:208) ~[hibernate-core-4.3.11.Final.jar!/:4.3.11.Final]
    ... 57 common frames omitted
Wrapped by: org.hibernate.exception.JDBCConnectionException: could not execute statement

编辑：

我已经添加了它并当前对其进行了测试：

  spring.datasource.testOnBorrow=true
  spring.datasource.validationQuery=SELECT 1

并删除autoReconnect。