Hibernate Session 服務器空閑后創建異常

Question

我正在使用一個簡單的 java 應用程序從瀏覽器操作表記錄。 我使用 hibernate 進行 DAO 調用。 該應用程序在正常使用時工作正常。 但是，當應用程序空閑 1 到 2 天時，會發生以下異常。

原因：java.sql.SQLException：IO 錯誤：連接重置

使用 c3p0 后，空閑時間延長至 10 天。 但我希望應用程序一直在運行。

我一直在使用 Linux 服務器。 JDK 1.5。 Tomcat 服務器 6.

我的 Hibernate 配置，

jdbc:oracle:thin:@something.com:1789:patentmd oracle.jdbc.driver.OracleDriver

    <property name="hibernate.connection.username">something</property>
      <property name="hibernate.connection.password">something</property>

    <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
    <property name="hibernate.show_sql">true</property>

 <!--    <property name="hibernate.current_session_context_class">thread</property>  -->

  <property name="c3p0.acquire_increment">1</property> 
    <property name="c3p0.idle_test_period">30</property> 
    <property name="c3p0.max_size">5</property> 
    <property name="c3p0.min_size">2</property>
    <property name="c3p0.max_statements">5</property> 
    <property name="c3p0.timeout">180</property>


     <!--  Mapping Resources. One entry should exist for each table  -->
    <mapping resource="com/hibernate/pojo/clientgrp/ClientGroup.hbm.xml"/>
       <mapping resource="com/hibernate/pojo/applepub/Apple_Pub.hbm.xml"/>
        <mapping resource="com/hibernate/pojo/prspub/Prs_Pub.hbm.xml"/>

</session-factory>

完整的堆棧跟蹤，

$$$$$$$$$$ sessionfactory is not null
Connection : true
Hibernate: select clientgrou0_.MGR_PRS_ID as MGR1_0_, clientgrou0_.MGR_PRS_NAME as MGR2_0_, clientgrou0_.MGR_CLIENT_GROUP as
 MGR3_0_, clientgrou0_.UPDATE_DT as UPDATE4_0_, clientgrou0_.CREATE_DT as CREATE5_0_, clientgrou0_.DEPT_NM as DEPT6_0_ from 
CLIENTGROUPS clientgrou0_
############ ClientGroupDAO.getAll()  , hibernate exception org.hibernate.exception.JDBCConnectionException: could not execu
te query
ClientGroupTableHandler.getAllRecords() $$$$$$$$ exception occured  6org.hibernate.HibernateException: org.hibernate.excepti
on.JDBCConnectionException: could not execute query
ClientGroupTableHandler.Main() $$$$$$$$ exception occured  1java.lang.Exception: org.hibernate.HibernateException: org.hiber
nate.exception.JDBCConnectionException: could not execute query
java.lang.Exception: org.hibernate.HibernateException: org.hibernate.exception.JDBCConnectionException: could not execute qu
ery
        at com.web.servlets.ClientGroupTableHandler.getAllRecords(ClientGroupTableHandler.java:294)
        at com.web.servlets.ClientGroupTableHandler.Main(ClientGroupTableHandler.java:76)
        at com.web.servlets.ClientGroupTableHandler.doPost(ClientGroupTableHandler.java:56)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:619)
Caused by: org.hibernate.HibernateException: org.hibernate.exception.JDBCConnectionException: could not execute query
        at com.hibernate.dao.ClientGroupDAO.getAll(ClientGroupDAO.java:76)
        at com.web.servlets.ClientGroupTableHandler.getAllRecords(ClientGroupTableHandler.java:288)
        ... 16 more
Caused by: org.hibernate.exception.JDBCConnectionException: could not execute query
        at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:99)
        at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
        at org.hibernate.loader.Loader.doList(Loader.java:2536)
        at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276)
        at org.hibernate.loader.Loader.list(Loader.java:2271)
        at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:452)
        at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363)
        at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
        at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1268)
        at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
        at com.hibernate.dao.ClientGroupDAO.getAll(ClientGroupDAO.java:45)
        ... 17 more
Caused by: java.sql.SQLException: IO Error: Connection reset
        at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:876)
        at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1153)
        at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1275)
        at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3576)
        at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3620)
        at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1203)
        at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208)
        at org.hibernate.loader.Loader.getResultSet(Loader.java:1953)
        at org.hibernate.loader.Loader.doQuery(Loader.java:802)
        at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
        at org.hibernate.loader.Loader.doList(Loader.java:2533)
        ... 25 more
Caused by: java.net.SocketException: Connection reset

  at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:96)
        at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
        at oracle.net.ns.DataPacket.send(DataPacket.java:199)
        at oracle.net.ns.NetOutputStream.flush(NetOutputStream.java:211)
        at oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:227)
        at oracle.net.ns.NetInputStream.read(NetInputStream.java:175)
        at oracle.net.ns.NetInputStream.read(NetInputStream.java:100)
        at oracle.net.ns.NetInputStream.read(NetInputStream.java:85)
        at oracle.jdbc.driver.T4CSocketInputStreamWrapper.readNextPacket(T4CSocketInputStreamWrapper.java:123)
        at oracle.jdbc.driver.T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:79)
        at oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1122)
        at oracle.jdbc.driver.T4CMAREngine.unmarshalSB1(T4CMAREngine.java:1099)
        at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:288)
        at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:191)
        at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:523)
        at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:207)
        at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:863)
        ... 35 more

塊引用

Answer 1

在您的 hibernate 配置文件中添加此屬性。 我希望它會奏效。

<property name="connection.provider_class">
      org.hibernate.connection.C3P0ConnectionProvider
    </property>

Answer 2

看起來很奇怪，您是否以某種方式持有過時的 Hibernate Session ？ 你應該總是得到一個新的 Hibernate Session 然后釋放它。

Answer 3

底層連接已過時。

正常的做法是在使用連接之前讓連接池測試連接。

對於 C3P0：

 c3p0.testConnectionOnCheckout=true
 c3p0.preferredTestQuery="select 1 from dual"

http://community.jboss.org/wiki/HowToConfigureTheC3P0ConnectionPool

另一個選項是將最小連接數設置為 0，並確保將池配置為在達到數據庫連接超時之前驅逐未使用的連接。