Question

我的应用程序使用oracle RDBMS版本12.1.0.2.0时遇到问题。虽然我正确地连接到数据库，但有时我得到（ A ）一些虚假的断开连接异常

    java.sql.SQLRecoverableException: IO Error: Connection reset
    at java.lang.Thread.run(Unknown Source)
    Suppressed: java.sql.SQLRecoverableException: Closed Connection

    ...

    Caused by: java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at oracle.net.ns.Packet.receive(Packet.java:311)
    at oracle.net.ns.DataPacket.receive(DataPacket.java:105)

和（ B ）有些时候我甚至无法创建连接

    java.sql.SQLRecoverableException: IO Error: Software caused connection abort: recv failed
    ...
    Caused by: java.net.SocketException: Software caused connection abort: recv failed

或者

    Caused by: java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection
        at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:673)
        at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:715)
        at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:385)
        at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:30)
        at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:564)
        at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createLocalManagedConnection(LocalManagedConnectionFactory.java:322)
        ... 6 more
    Caused by: oracle.net.ns.NetException: The Network Adapter could not establish the connection
        at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:445)
        at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:464)
        at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:594)
        at oracle.net.ns.NSProtocol.connect(NSProtocol.java:229)
        at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1360)
        at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:486)
        ... 11 more
    Caused by: java.net.ConnectException: Connection refused: connect
        at java.net.TwoStacksPlainSocketImpl.socketConnect(Native Method) [rt.jar:1.8.0_92]
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) [rt.jar:1.8.0_92]
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) [rt.jar:1.8.0_92]
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) [rt.jar:1.8.0_92]
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) [rt.jar:1.8.0_92]
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) [rt.jar:1.8.0_92]
        at java.net.Socket.connect(Socket.java:589) [rt.jar:1.8.0_92]
        at oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:162)
        at oracle.net.nt.ConnOption.connect(ConnOption.java:133)
        at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:411)

某些应用程序正在使用带有以下独立设置的wildfly v8.2

    <connection-url>connectionString</connection-url>
    <driver-class>oracle.jdbc.OracleDriver</driver-class>
    <driver>ojdbc7.jar</driver>  
    <pool>
        <min-pool-size>12</min-pool-size>
        <max-pool-size>24</max-pool-size>
        <prefill>false</prefill>
        <use-strict-min>true</use-strict-min>
    </pool>
    <security>
        <user-name>user</user-name>
        <password>password</password>
    </security>
    <validation>
        <valid-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleValidConnectionChecker"/>
        <validate-on-match>false</validate-on-match>
        <background-validation>true</background-validation>
        <background-validation-millis>300000</background-validation-millis>
        <exception-sorter class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleExceptionSorter"/>
    </validation>
    <timeout>
        <set-tx-query-timeout>false</set-tx-query-timeout>
        <blocking-timeout-millis>0</blocking-timeout-millis>
        <idle-timeout-minutes>8</idle-timeout-minutes>
        <query-timeout>0</query-timeout>
        <use-try-lock>0</use-try-lock>
        <allocation-retry>0</allocation-retry>
        <allocation-retry-wait-millis>0</allocation-retry-wait-millis>
    </timeout>
    <statement>
        <track-statements>true</track-statements>
        <share-prepared-statements>false</share-prepared-statements>
    </statement>

其余的是使用JDBC的独立应用程序。我已经检查了监听器日志，并根据它们，应用程序从未发送请求（ B 方案）。请注意，应用程序稍后重试并成功连接，并且应用程序部署在同一网络中。

请帮助确定原因？

谢谢。

Answer 1

（A）：错误表示套接字已正常关闭。这可能是微网络中断，或者它可能是应用程序和数据库之间的中间位置，当它检测到没有活动超过x秒时关闭套接字。通过将outputs连接属性设置为oracle.net.keepAlive，可以帮助打开保持活动状态。请注意，也可以使用true将此属性设置为Java系统属性。

（B）：如果配置了速率限制，监听器可能会拒绝套接字连接尝试，这有助于登录风暴期间。一个合适的客户端应该延迟重试。 12.1.0.2中的JDBC瘦驱动程序在URL中支持这两个参数（值以秒为单位）。例如：

-D

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