Examples of java.net.UnknownHostException

java.net.UnknownHostException
Thrown to indicate that the IP address of a host could not be determined. @author Jonathan Payne @version 1.16, 11/17/05 @since JDK1.0

        Date start = new Date();
        Record[] records = lookup.run();
        Date end = new Date();


        if (records == null || records.length == 0) {
            throw new UnknownHostException(hostname);
        }


        // assembly the addr object
        ARecord a = (ARecord) records[0];
        InetAddress addr = InetAddress.getByAddress(hostname, a.getAddress().getAddress());

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      this(new ConnectionId(address, null));
    }
    
    public Connection(ConnectionId remoteId) throws IOException {
      if (remoteId.getAddress().isUnresolved()) {
        throw new UnknownHostException("unknown host: " + 
                                       remoteId.getAddress().getHostName());
      }
      this.remoteId = remoteId;
      UserGroupInformation ticket = remoteId.getTicket();
      this.setName("IPC Client (" + socketFactory.hashCode() +") connection to " +

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    } catch (ParserConfigurationException pce) {
      throw new CatalogException(CatalogException.UNKNOWN_FORMAT);
    } catch (SAXException se) {
      Exception e = se.getException();
      // FIXME: there must be a better way
      UnknownHostException uhe = new UnknownHostException();
      FileNotFoundException fnfe = new FileNotFoundException();
      if (e != null) {
  if (e.getClass() == uhe.getClass()) {
    throw new CatalogException(CatalogException.PARSE_FAILED,
             e.toString());
  } else if (e.getClass() == fnfe.getClass()) {
    throw new CatalogException(CatalogException.PARSE_FAILED,
             e.toString());

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    public Connection(ConnectionId remoteId) throws IOException {
      this.remoteId = remoteId;
      this.server = remoteId.getAddress();
      if (server.isUnresolved()) {
        throw new UnknownHostException("unknown host: " + 
                                       remoteId.getAddress().getHostName());
      }
      
      this.rpcTimeout = remoteId.getRpcTimeout();

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      throw bindException;
    } catch (SocketException e) {
      // If they try to bind to a different host's address, give a better
      // error message.
      if ("Unresolved address".equals(e.getMessage())) {
        throw new UnknownHostException("Invalid hostname for server: " +
                                       address.getHostName());
      } else {
        throw e;
      }
    }

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    } catch (ParserConfigurationException pce) {
      throw new CatalogException(CatalogException.UNKNOWN_FORMAT);
    } catch (SAXException se) {
      Exception e = se.getException();
      // FIXME: there must be a better way
      UnknownHostException uhe = new UnknownHostException();
      FileNotFoundException fnfe = new FileNotFoundException();
      if (e != null) {
  if (e.getClass() == uhe.getClass()) {
    throw new CatalogException(CatalogException.PARSE_FAILED,
             e.toString());
  } else if (e.getClass() == fnfe.getClass()) {
    throw new CatalogException(CatalogException.PARSE_FAILED,
             e.toString());

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      this(new ConnectionId(address, null));
    }
    
    public Connection(ConnectionId remoteId) throws IOException {
      if (remoteId.getAddress().isUnresolved()) {
        throw new UnknownHostException("unknown host: " + 
                                       remoteId.getAddress().getHostName());
      }
      this.remoteId = remoteId;
      UserGroupInformation ticket = remoteId.getTicket();
      this.setName("IPC Client (" + socketFactory.hashCode() +") connection to " +

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      throw bindException;
    } catch (SocketException e) {
      // If they try to bind to a different host's address, give a better
      // error message.
      if ("Unresolved address".equals(e.getMessage())) {
        throw new UnknownHostException("Invalid hostname for server: " +
                                       address.getHostName());
      }
      throw e;
    }
  }

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    protected final AtomicBoolean shouldCloseConnection = new AtomicBoolean();  // indicate if the connection is closed
    protected IOException closeException; // close reason


    Connection(ConnectionId remoteId) throws IOException {
      if (remoteId.getAddress().isUnresolved()) {
        throw new UnknownHostException("unknown host: " +
                                       remoteId.getAddress().getHostName());
      }
      this.remoteId = remoteId;
      User ticket = remoteId.getTicket();
      Class<? extends VersionedProtocol> protocol = remoteId.getProtocol();

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      throw bindException;
    } catch (SocketException e) {
      // If they try to bind to a different host's address, give a better
      // error message.
      if ("Unresolved address".equals(e.getMessage())) {
        throw new UnknownHostException("Invalid hostname for server: " +
                                       address.getHostName());
      }
      throw e;
    }
  }

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