How to check if remote host is alive

Hi,
i was wondering how you could implement a ICMP ping message in java so that a low priority thread can be written so as to ping remote host to verify if the host is still alive?
any links or help would be greatly appreciated. pls allow me to thank all of you in advance
rgds,
Javier

There is a sample for new nio packages at:
http://java.sun.com/j2se/1.4/docs/guide/nio/example/index.html
Please, see Ping.java

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  • A remote host refused an attempted connect operation

    I have been tasked with putting together a demo of Adobe Interactive Forms on our development system, and I'm following the steps listed in the SAP How-To guide, "How To... Create Online and Offline Forms in Web Dynpro for Java."
    The demo form (as described in the How-To) has been created and deployed from a NetWeaver 2004s to our Application Server 6.40 (with all the latest patches).  When run, however, I get a 500 Internal Error:
          <b>java.net.ConnectException: A remote host refused an attempted connect operation.</b>
    Our BASIS team has confirmed that ADS is configured correctly on the server, per SAP Note 944221.
    Any suggestions on the cause and possible fixes would be greatly appreciated.
    <b>Addendum:</b>
    Here is the exception chain:
    com.sap.tc.webdynpro.clientserver.adobe.pdfdocument.base.core.PDFDocumentRuntimeException: Failed to  UPDATEDATAINPDF
         at com.sap.tc.webdynpro.clientserver.adobe.pdfdocument.base.core.PDFDocumentRuntimeException.<init>(PDFDocumentRuntimeException.java:25)
         at com.sap.tc.webdynpro.clientserver.uielib.adobe.impl.InteractiveForm.afterHandleActionEvent(InteractiveForm.java:392)
         at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.afterApplicationModification(ClientApplication.java:1132)
         at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.afterApplicationModification(ClientComponent.java:887)
         at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doRespond(WindowPhaseModel.java:573)
         at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequest(WindowPhaseModel.java:152)
         at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.processRequest(WebDynproWindow.java:335)
         at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:143)
         at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:299)
         at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingStandalone(ClientSession.java:752)
         at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:705)
         at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:261)
         at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:154)
         at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:62)
         at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doGet(DispatcherServlet.java:46)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
         at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
         at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
         at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)
         at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:365)
         at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:944)
         at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:266)
         at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
         at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:174)
         at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
         at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
         at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
         at java.security.AccessController.doPrivileged(AccessController.java:215)
         at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
         at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)
    Caused by: com.sap.tc.webdynpro.clientserver.adobe.pdfdocument.base.core.PDFDocumentRuntimeException: PDFDocument Processor failed to process Render Request.
         at com.sap.tc.webdynpro.clientserver.adobe.pdfdocument.base.core.PDFDocumentRuntimeException.<init>(PDFDocumentRuntimeException.java:25)
         at com.sap.tc.webdynpro.clientserver.adobe.pdfdocument.base.core.PDFDocumentProcessor.process(PDFDocumentProcessor.java:55)
         at com.sap.tc.webdynpro.clientserver.adobe.pdfdocument.base.core.PDFDocumentInteractiveFormHandlingContext.execute(PDFDocumentInteractiveFormHandlingContext.java:98)
         at com.sap.tc.webdynpro.clientserver.adobe.pdfdocument.base.core.PDFDocumentInteractiveFormHandlingContext.execute(PDFDocumentInteractiveFormHandlingContext.java:121)
         at com.sap.tc.webdynpro.clientserver.uielib.adobe.impl.InteractiveForm.afterHandleActionEvent(InteractiveForm.java:336)
         ... 29 more
    Caused by: com.sap.tc.webdynpro.pdfobject.core.PDFObjectRuntimeException: Service call exception; nested exception is:
         java.net.ConnectException: A remote host refused an attempted connect operation.
         at com.sap.tc.webdynpro.pdfobject.core.PDFObject.doSoapCall(PDFObject.java:408)
         at com.sap.tc.webdynpro.pdfobject.core.PDFObject.render(PDFObject.java:3958)
         at com.sap.tc.webdynpro.clientserver.adobe.pdfdocument.base.core.PDFDocumentRenderHandler.handle(PDFDocumentRenderHandler.java:148)
         at com.sap.tc.webdynpro.clientserver.adobe.pdfdocument.base.core.PDFDocumentProcessor.process(PDFDocumentProcessor.java:52)
         ... 32 more
    Caused by: java.rmi.RemoteException: Service call exception; nested exception is:
         java.net.ConnectException: A remote host refused an attempted connect operation.
         at com.sap.tc.webdynpro.adsproxy.ConfigBindingStub.rpData(ConfigBindingStub.java:85)
         at com.sap.tc.webdynpro.adsproxy.ConfigBindingStub.rpData(ConfigBindingStub.java:95)
         at com.sap.tc.webdynpro.pdfobject.core.PDFObject.doSoapCall(PDFObject.java:385)
         ... 35 more
    Caused by: java.net.ConnectException: A remote host refused an attempted connect operation.
         at java.net.PlainSocketImpl.socketConnect(Native Method)
         at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:336)
         at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:201)
         at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:188)
         at java.net.Socket.connect(Socket.java:482)
         at java.net.Socket.connect(Socket.java:432)
         at java.net.Socket.<init>(Socket.java:339)
         at java.net.Socket.<init>(Socket.java:150)
         at com.sap.engine.services.webservices.jaxm.soap.HTTPSocket.initStreamsFromSocket(HTTPSocket.java:648)
         at com.sap.engine.services.webservices.jaxm.soap.HTTPSocket.initializeStreams(HTTPSocket.java:470)
         at com.sap.engine.services.webservices.jaxm.soap.HTTPSocket.getOutputStream(HTTPSocket.java:427)
         at com.sap.engine.services.webservices.jaxrpc.wsdl2java.soapbinding.HTTPTransport.getRequestStream(HTTPTransport.java:355)
         at com.sap.engine.services.webservices.jaxrpc.wsdl2java.soapbinding.MimeHttpBinding.outputMessage(MimeHttpBinding.java:548)
         at com.sap.engine.services.webservices.jaxrpc.wsdl2java.soapbinding.MimeHttpBinding.call(MimeHttpBinding.java:1425)
         at com.sap.tc.webdynpro.adsproxy.ConfigBindingStub.rpData(ConfigBindingStub.java:78)
         ... 37 more
    -- Nick

    Hi Nick,
    Can you verify the ADS connection using the web service test tool? Go to http://myhost:50000/, choose web services, choose the 1st one (Adobe Document Services?), choose test, don't enter any values (leave the default values) and choose test (or something very similar, I don't have access to a server right now to verify it). You should get a login screen where you need to login with "ADSUser". Finally you should see the request and response where the response status code must be "200 OK" (and the response content-type should not be text/html; that's when a logon screen html page is returned, e.g. if the password is expired).
    If it fails somewhere, try it again using the FQHN, e.g. http://myhost.mydomain.com:50000/ (I think we had a similar issue once).
    If the web service test doesn't work, there's definitely a problem with the ADS configuration. If the web service does work, check the connection settings in Visual Administrator <a href="http://help.sap.com/saphelp_nw04s/helpdata/en/43/f3fcf604777062e10000000a1553f6/frameset.htm">Setting Up Basic Authentication in a Java Environment</a> (or the ABAP and/or SSL version of the same document).
    Kind regards,
    Sigiswald

  • Unable to delete file on the remote host

    Hi,
    I tried to delete a file on the remote host using File.delete method as well as using Runtime.getRuntime.exec("del filename")
    But both of them failed to work. First one returned false, but the second one is throwing IOException always.
    I am trying this through a java application in Windows NT environment. I am using jdk1.3. How can i solve this problem?.
    IOException occured at DataLoadFromTxtToOra exeBatchForTWS: CreateProcess: del \\ERSWEB\DTemp\ERS\HEB_428\DATAFILES\ERSWEB\DLCOMMA.txt error=2
    Regards,
    Babu

    you should be able to do that if you have rights on the file, try the following code and substitute the computer/share names:
                   File aFile = new File("\\\\COMPUTER\\share\\filename.ext");
                   System.out.println("Read: " + aFile.canRead());
                   System.out.println("Write: " + aFile.canWrite());
                   System.out.println("Exists: " + aFile.exists());
                   System.out.println("File: " + aFile.isFile());
                   aFile.delete();Mind the slashes: a single backslash is causing a escape character: \n for example is a (unix) return. A double \\ defeats it and results in a single \ in the filename
    If everything returns true I think the file will be deleted. If isFile() returns false you've got the path/filename wrong.

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