线程挂在DriverManager.getConnection上

我有一个多线程程序，应该全天候运行，有时我会看到一些线程会在程序运行一段时间后挂起，没有例外或错误。它只是不会做任何事情。我跑到一个线程转储，看看有什么问题，这是线程相关threaddump这是没有做任何事情线程挂在DriverManager.getConnection上

"Thread2" prio=6 tid=0x0000000014814000 nid=0xbf8 runnable [0x00000000159fe000] 
    java.lang.Thread.State: RUNNABLE 
     at java.net.SocketInputStream.socketRead0(Native Method) 
     at java.net.SocketInputStream.read(Unknown Source) 
     at java.net.SocketInputStream.read(Unknown Source) 
     at org.postgresql.core.VisibleBufferedInputStream.readMore(VisibleBufferedInputStream.java:143) 
     at org.postgresql.core.VisibleBufferedInputStream.ensureBytes(VisibleBufferedInputStream.java:112) 
     at org.postgresql.core.VisibleBufferedInputStream.read(VisibleBufferedInputStream.java:71) 
     at org.postgresql.core.PGStream.ReceiveChar(PGStream.java:272) 
     at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:269) 
     at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:106) 
     at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:64) 
     at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:123) 
     at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:28) 
     at org.postgresql.jdbc3g.AbstractJdbc3gConnection.<init>(AbstractJdbc3gConnection.java:20) 
     at org.postgresql.jdbc4.AbstractJdbc4Connection.<init>(AbstractJdbc4Connection.java:30) 
     at org.postgresql.jdbc4.Jdbc4Connection.<init>(Jdbc4Connection.java:22) 
     at org.postgresql.Driver.makeConnection(Driver.java:391) 
     at org.postgresql.Driver.connect(Driver.java:265) 
     at java.sql.DriverManager.getConnection(Unknown Source) 
     at java.sql.DriverManager.getConnection(Unknown Source) 
     at database.Database.isItInDatabase(Database.java:1108) 
     at miner.Miner.run(Miner.java:145) 
     at java.lang.Thread.run(Unknown Source)

以下是数据库方法

public Boolean isItInDatabase(String userName) throws SQLException 
{ 
    Connection conn = null; 
    PreparedStatement pst = null; 
    ResultSet rs = null; 
    Boolean exists = false; 

    try 
    { 
     Class.forName("org.postgresql.Driver"); 
     conn = DriverManager.getConnection("jdbc:postgresql://MYSERVERIP:5432/" + database, username, password); //--->>>>>>line 1108 
     pst = conn.prepareStatement("SELECT COUNT(*) FROM listing_info where listing_url = ?"); 
     pst.setString(1, userName); 

     rs = pst.executeQuery(); 
     while (rs.next()) 
     { 
      exists = rs.getBoolean(1); 
     } 

    } 
    catch (Exception e) 
    { 
     System.out.println(e); 
    } 
    finally 
    { 
     pst.close(); 
     rs.close(); 
     conn.close(); 
    } 

    return exists; 
}

我已标记，其中线1108在我的数据库文件中。有什么我可以解决这个问题吗？所以程序不会永远在那里等待？

来源

2012-12-01 Arya

这与数据库无关。这是一个挂起的插座连接。它发生在套接字连接中断时。阻止挂起的唯一方法是使用套接字读取超时。看起来像postgresql有一些jdbc driver config properties这将解决这个问题。

来源

2012-12-01 18:28:50 jtahlborn

线程挂在DriverManager.getConnection上

回答

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