org.postgresql.util.PSQLException：连接尝试失败

我连接到的Postgres数据库使用Java Web服务（Apache Axis的）与JDBC连接拿到data.But突然在大多数的时候，我是得到org.postgresql.util.PSQLException: The connection attempt failed.的例外，有些时候它工作正常。这里我使用了许多准备好的陈述。我的示例代码有关此异常org.postgresql.util.PSQLException：连接尝试失败

Connection connection=null; 
try 
{ 
    Class.forName(driver); 
    connection = DriverManager.getConnection(url, username, password); 
    ps1=connection.prepareStatement("select * from emp"); 
    rs1=ps1.executeQuery(); 
    while(rs1.next()) 
    {    
     ps2=connection.prepareStatement("select * from dept where dept_no="+rs1.getInt("dept_no")); 
     rs2=ps2.executeQuery(); 
     while(rs2.next()) 
     { 
      ................ 
      ................ 
     } 
    } 
} 
catch(Exception e) 
{ 
    System.out.println("Exception occurred is"+e.getMessage());    
} 
finally 
{ 
    try{if(rs1!=null)rs1.close();}catch(Exception e){ System.out.println("*1closing error--->"+e);} 
    try{if(ps1!=null)ps1.close();}catch(Exception e){ System.out.println("**1closing error--->"+e);} 
    try{if(rs2!=null)rs2.close();}catch(Exception e){ System.out.println("*2closing error--->"+e);} 
    try{if(ps2!=null)ps2.close();}catch(Exception e){ System.out.println("**2closing error--->"+e);} 
    try{if(connection!=null)connection.close();}catch(Exception e){ System.out.println("***closing error--->"+e);} 
}

堆栈跟踪

org.postgresql.util.PSQLException: The connection attempt failed. 
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:137) 
    at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:66) 
    at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:124) 
    at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:30) 
    at org.postgresql.jdbc3.Jdbc3Connection.<init>(Jdbc3Connection.java:24) 
    at org.postgresql.Driver.makeConnection(Driver.java:386) 
    at org.postgresql.Driver.connect(Driver.java:260) 
    at java.sql.DriverManager.getConnection(Unknown Source) 
    at java.sql.DriverManager.getConnection(Unknown Source) 
    at com.codon.service.WareHouseServer.get_picks(WareHouseServer.java:7415) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.apache.axis.providers.java.RPCProvider.invokeMethod(RPCProvider.java:397) 
    at org.apache.axis.providers.java.RPCProvider.processMessage(RPCProvider.java:186) 
    at org.apache.axis.providers.java.JavaProvider.invoke(JavaProvider.java:323) 
    at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32) 
    at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118) 
    at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83) 
    at org.apache.axis.handlers.soap.SOAPService.invoke(SOAPService.java:454) 
    at org.apache.axis.server.AxisServer.invoke(AxisServer.java:281) 
    at org.apache.axis.transport.http.AxisServlet.doPost(AxisServlet.java:699) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327) 
    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:857) 
    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(Unknown Source) 
Caused by: java.net.SocketException: Connection reset 
    at java.net.SocketInputStream.read(Unknown Source) 
    at org.postgresql.core.VisibleBufferedInputStream.readMore(VisibleBufferedInputStream.java:135) 
    at org.postgresql.core.VisibleBufferedInputStream.ensureBytes(VisibleBufferedInputStream.java:104) 
    at org.postgresql.core.VisibleBufferedInputStream.read(VisibleBufferedInputStream.java:73) 
    at org.postgresql.core.PGStream.ReceiveChar(PGStream.java:259) 
    at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:254) 
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:95) 
    ... 37 more

我检查了Postgres的日志，我发现在不同情况下

下面的语句

1.WARNING：工人花了太长时间开始;取消。

2.could不重新连接到共享存储器（密钥= ....，ADDR = .....）：487

3.could未接收到来自客户机数据：无连接可以作出，因为目标机器积极拒绝它。

4.在客户端连接上调用EOF。

请帮me.Thanks在提前

来源

2013-04-04 Sasi Vara Prasad

您需要显示* full *异常堆栈跟踪，因为嵌套的异常将包含问题的详细信息。鉴于您没有使用连接的连接，如果您遇到max_connections问题，我不会感到惊讶，但如果没有完整的错误，很难说。 – 2013-04-04 08:37:19

你正在关闭所有准备好的语句和结果集吗？在给定的例子中关闭ps2和rs2是隐藏的 – 2013-04-04 08:40:08

我更新了堆栈跟踪关于异常的问题，上次我忘了发布'ps2'和'rs2'结束语句。我在应用程序中完成了它。 – 2013-04-04 10:34:36

真正的问题是：当Java的尝试从中读取

Caused by: java.net.SocketException: Connection reset 
    at java.net.SocketInputStream.read

连接被关闭。这可以由以下原因引起：

PostgreSQL服务器正在重新启动
您连接到被终止PostgreSQL的后台
您连接到崩溃
狡猾的网络连接
严重PostgreSQL的后台表现有状态的防火墙
NAT防火墙/路由器的NAT连接表中的空闲连接超时

...或许更多。检查PostgreSQL服务器日志以查看是否有任何信息;也考虑使用Wireshark等工具进行网络跟踪。

来源

2013-04-04 11:28:27

我用postgres日志文件中的语句更新了我的问题 – 2013-04-04 13:03:16

org.postgresql.util.PSQLException：连接尝试失败

回答

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