org.postgresql.util.PSQLException:连接尝试失败
问题描述:
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
答
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。
+0
我用postgres日志文件中的语句更新了我的问题 – 2013-04-04 13:03:16
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