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


    /* ------------------------------------------------------------------------------- */
    public HttpDestination getDestination(Address remote, boolean ssl) throws UnknownHostException, IOException
    {
        if (remote==null)
            throw new UnknownHostException("Remote socket address cannot be null.");


        synchronized (_destinations)
        {
            HttpDestination destination=_destinations.get(remote);
            if (destination==null)

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


    public 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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          }
        }
      }
      // unresolvable!
      if (addr == null) {
        throw new UnknownHostException(host);
      }
      return addr;
    }

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  public static Text buildTokenService(InetSocketAddress addr) {
    String host = null;
    if (useIpForTokenService) {
      if (addr.isUnresolved()) { // host has no ip address
        throw new IllegalArgumentException(
            new UnknownHostException(addr.getHostName())
        );
      }
      host = addr.getAddress().getHostAddress();
    } else {
      host = addr.getHostName().toLowerCase();

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      if (server.isUnresolved()) {
        throw NetUtils.wrapException(server.getHostName(),
            server.getPort(),
            null,
            0,
            new UnknownHostException());
      }
      this.rpcTimeout = remoteId.getRpcTimeout();
      this.maxIdleTime = remoteId.getMaxIdleTime();
      this.connectionRetryPolicy = remoteId.connectionRetryPolicy;
      this.maxRetriesOnSasl = remoteId.getMaxRetriesOnSasl();

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    assertInException(wrapped, "/BindException");
  }


  @Test
  public void testWrapUnknownHostException() throws Throwable {
    IOException e = new UnknownHostException("failed");
    IOException wrapped = verifyExceptionClass(e, UnknownHostException.class);
    assertInException(wrapped, "failed");
    assertWikified(wrapped);
    assertInException(wrapped, "localhost");
    assertRemoteDetailsIncluded(wrapped);

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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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    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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