Question about using Runtime.getRuntime();

hi all
i have a question about using Runtime.getRuntime(). if i use this to get a runtime reference to run an external program, is it considered as starting a new thread inside the thread that starts it?
is it safe to do it in the Session EJB? if not, what can you recommand to do it? thanks

hi all
i have a question about using Runtime.getRuntime().
if i use this to get a runtime reference to run an
external program, is it considered as starting a new
thread inside the thread that starts it? No. Starting a process, starts a process. Threads have nothing to do with it.
is it safe to do it in the Session EJB? if not, what
can you recommand to do it? thanksSo what? Run another process? If you want to run another process in java then your choices are to use Runtime.exec() or use JNI. And using JNI will probably end up doing exactly the same thing as Runtime.exec().
"Safe" is harder. Typically to correctly use Runtime.exec() you must use threads. And as noted threads ideally should not be used. You can use them but if you do you had better understand why they didn't want you using them in the first place. You had also better be sure that you really want to wait for it to complete.
Other than that Runtime.exec() is safe because it can't crash the VM like other interfaces can (like JNI.)

Similar Messages

  • How to use Runtime.getRuntime().exec() in JSP? is it works in JSP or not

    Hi to all,
    i want run a .exe file from JSP file. In java i am able do this, using Runtime.getRuntime().exec().
    but same thing, when i trying with JSP it is not working?
    plz let me is there any other ways to do it..

    It depends, usually (ie in an J2EE container) you're not allowed to access files or the runtime environment, by definition. What do you wan't to achieve with the exe?
    --olaf                                                                                                                                                                                                                                                                                                                                                           

  • I have a question about using multiple ipads in our school.  Each of our teachers have a iPad and AppleTV in their classroom.  The issue is, with our classrooms so close in proximity to one another, is there a way to pair teacher

    I have a question about using multiple ipads in our school.  Each of our teachers have a iPad and AppleTV in their classroom.  The issue is, with our classrooms so close in proximity to one another, is there a way to pair teacher #1 iPad to its AppleTV without effecting/projecting onto the adjacent teachers #2 classroom AppleTV?

    Not as such.
    Give the AppleTV units unique names and also enable Airplay password in settings with unique passwords for each teacher.
    AC

  • Hi, I have quick question about use of USEBEAN tag in SP2. When I specify a scope of SESSION for the java bean, it does not keep the values that I set for variable in the bean persistent.Thanks,Sonny

     

    Make sure that your bean is implementing the serializable interface and that
    you are accessing the bean from the session with the same name.
    Bryan
    "Sandeep Suri" <[email protected]> wrote in message
    news:[email protected]..
    Hi, I have quick question about use of USEBEAN tag in SP2. When I
    specify a scope of SESSION for the java bean, it does not keep the
    values that I set for variable in the bean persistent.Thanks,Sonny
    Try our New Web Based Forum at http://softwareforum.sun.com
    Includes Access to our Product Knowledge Base!

  • Question about using new battery in old Powerbook

    I have a pre-intel Powerbook G4, and the battery is pretty much toast (lasts about 15 minutes now). I have ordered a new battery for it, and I have this question about using it:
    Am I smarter to keep the new strong battery out of the PB most days (as I usually work with it plugged in at home) and just pop it in when I know I will be out surfing on batteries? Or is it just as good living in my laptop 24/7 and only occasionally being called upon to do its job?
    Current bad Battery Information below:
    Battery Installed: Yes
    First low level warning: No
    Full Charge Capacity (mAh): 1144
    Remaining Capacity (mAh): 1115
    Amperage (mA): 0
    Voltage (mV): 12387
    Cycle Count: 281
    thanks folks, Shereen

    Hi, Shereen. Every Powerbook battery wants to be used — drained and then recharged — at least every couple of weeks. If you've always used your Powerbook on AC power nearly all the time, and not followed that pattern of discharging and recharging the battery every week or two, it's possible that your use habits have shortened the lifespan and prematurely diminished the capacity of your old battery. Of course it's also possible that your battery is merely old, as a battery's capacity also diminishes with age regardless of how it's used. You didn't say how old the battery is in years, so this may or may not be an issue. I mention it only because it can be an issue.
    For general information on handling a battery for the longest possible lifespan, see this article. My advice on the basis of that article and long experience reading these forums is that it would be OK to do as you propose, but I doubt that you'd derive any significant benefit from it. You would still want to be sure of putting the new battery through a charge/discharge cycle every week or two, even if you didn't have a reason to use the Powerbook away from home or your desk, because sitting unused outside the computer is just as bad for a battery as sitting unused inside it. And you should never remove the battery from your computer when it's completely or almost completely discharged and let it sit that way any longer than a day or two.
    Message was edited by: eww

  • Question about using TVARV in an ABAP program

    Hello gurus, Im sorry about the silly question.
    I have a question about using TVARV in an ABAP program.
    A program is presenting a problem and I think that in this code:
    SELECT SIGN OPTI LOW HIGH
      FROM TVARV
      INTO TABLE R_1_163431035_VELOCIDADE
      WHERE  NAME = '1_163431035_VELOCIDADE'
      AND    TYPE = 'S'.
      IF ZMM001-VELOCIDADE_B   IN R_1_163431035_VELOCIDADE AND
          ZOPERADORAS-OPERADORA = 'ABCD' AND
          ZMM001-MATERIAL       IN R_1_163431035_PRODUTO.
      ELSE.
      ENDIF.
    What happens is that the value "ZMM001-SPEED" B not exist in "R1_163431035_VELOCIDADE" but the program executes commands under the IF and not under the ELSE, as I imagine it would work. Is this correct ?
    I am new to ABAP programming, but I have a lot of XP in other programming languages ​​and this makes no sense to me.
    Anyone know where I can find some documentation of the use of "TVARV" in ABAP programs?
    I search the Internet if other programmers use TVARV this way, but found nothing, which leads me to think that was a quick and dirty solution that used here.
    If this is a bad way to program, what would be the best way?
    Regards
    Ronaldo.

    Hi Ronaldo,
    But in this case, the range is not empty, there are 17 records, in this way.:
    For the column "SING" all values ​​are "E"
    It means that the result is false if ZMM001-VELOCIDADE_B has the same value as one of the 17 records (E = exclude).
    For instance, if it has value 'C' and one of 17 records matches C, then the result is false.
    The "IF" with "IN" using "TVARV" as used in the program of the post above has the same behavior of a selection screen?
    Yes, the same behavior as the selection criterion to be exact. You can press the help key in the complex selection dialog for more info.
    I know it's a silly and very basic question, but other language that I used, only the SQL has the "IN" operator, but I think they work in different ways, so I would like to understand how it works in ABAP.
    Not silly ;-). Yes they work differently.
    More info here:
    - http://help.sap.com/saphelp_nw70/helpdata/en/9f/dba74635c111d1829f0000e829fbfe/frameset.htm
    - http://help.sap.com/saphelp_nw70/helpdata/en/9f/dba71f35c111d1829f0000e829fbfe/frameset.htm
    BR
    Sandra

  • Question about using Macbook in Vietnam.

    I have a question about using Macbook in Vietnam. I bought my mac here in the US, and I'm going to visit Vietnam, but I'm wondering if I can plug in the power directly into the wall or I have to need any convert power modem for my mac. The only thing I know that Vietnam use 220V so, can anyone help me?

    You may need a plug adaptor, but you don't need a power converter.
    (43828)

  • I have a question about using adobe CS files in CS6 edition

    I am a graphic artist . I have a question about using adobe CS files in CS6 edition. when I am gonna open thse adobe CS created files in CS6 Edition i get a color variation than i made with the CS version.Please give me an idea about this issue as soon as possible.If you need i can upload my problem as a screenshot to clearity

    donrulz,
    Are your Edit>Color Settings the same?
    Are you using spot colours, such as Pantone (there have been some changes in CMYK values with new colour books)?

  • Where Would be the best category to ask a question about using dashboard?

    Where Would be the best category to ask a question about using dashboard?

    However, don't ask it in this topic. Create a new topic for the question with a title describing that you are looking for Dashboard help.

  • Question about Using PAPI Web Service in PowerBuilder 9

    Hi, all.
    I Have a simple question about using papiws in power builder 9.
    In pb9, I created a new Web Service Proxy Wizard and I input a url for papiws(ex. http://seraphpernote:7001/papiws/PapiWebService) and click next.
    But I couldn't get any Service List.
    In Eclipse, I used this url for using papiws well.
    Does anybody know about this case??
    help me plz.

    IIRC you must activate PAPI-WS for the engine. In Studio you do it by right-clicking on the project, then "engine preferences". In enterprise/standalone you must activate PAPI-WS in the Admin Center.

  • Question about using 10g/11g and APEX ...

    Hi,
    I just recently learned of Oracle's APEX and have a few questions about using it.
    Can I use APEX with express, standard, and enterprise editions of 10g and 11g?
    Are all of these free to use?

    You might want to read about APEX rather than jumping into questions that are reasonably well documented. Info at http://www.oracle.com/technology/products/database/application_express/index.html
    Your specific questions:
    1) Apex is a package that can be installed into any properly licensed database.
    2) The price for the production license of the database varies by edition.
    The price for Express Edition is $0 for use in production. Part of the cost for that edition is 'no Oracle Support based support, no patches, data volume limitation, etc.'

  • Is there any way to run without using Runtime.getRuntime().exec()

    I am looking for a way to get my program to fun files on my system without using
    Runtime.getRuntime().exec() because it's causing me nothing but problems, is there any other way to do it without using this command?

    Can't think of an easier way (JNI, etc.).
    If you have not read the following article you really should, it might clear up a lot of your problems with exec():
    http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

  • How to use Runtime.getRuntime("command") in win?

    I dont know how to use this method in win entironment, for example about file opertions, where there is some documents on detail about it?

    Huh?
    There is a method called Runtime.getRuntime(). It does not take any parameters. The javadocs describe it.
    Is that what you are asking about?

  • How to execute an application in Solaris using Runtime.getRuntime.exec() ?

    I am currently doing a project which requires the execution of Solaris applications through the use of Java Servlet with this Runtime method - Runtime.getRuntime.exec()
    This means that if the client PC tries to access the servlet in the server PC, an application is supposed to be executed and launched on the server PC itself. Actually, the servlet part is not an issue as the main problem is the executing of applications in different platforms which is a big headache.
    When I tried running this program on a Windows 2000 machine, it works perfectly fine. However, when I tried it on a Solaris machine, nothing happens. And I mean nothing... no errors, no nothing. I really don't know what's wrong.
    Here's the code.
    public void doPost(HttpServletRequest request, HttpServletResponse response)
         throws ServletException, IOException
         response.setContentType("text/html");
         PrintWriter out = response.getWriter();
              Process process;                                                       Runtime runtime = Runtime.getRuntime();
              String com= "sh /opt/home/acrobat/";
              String program = request.getParameter("program");
              try
                        process = runtime.exec(com);
              catch (Exception e)
                   out.println(e);
    It works under Windows when com = "c:\winnt\system32\notepad.exe"
    When under Solaris, I have tried everything possible. For example, the launching of the application acrobat.
    com = "/opt/home/acrobat"
    com = "sh /opt/home/acrobat"I have also tried reading in the process and then printing it out. It doesn't work either. It only works when excuting commands like 'ls'
    BufferedReader read = new BufferedReader(new InputStreamReader(process.getInputStream()));Why is it such a breeze to execute prgrams under Windows while there are so many problems under Solaris.
    Can some experts please please PLEASE point out the errors and give me some advice and help to make this program work under Solaris! Please... I really need to do this!!
    My email address - [email protected]
    I appreciate it.
    By the way, I'm coding and compiling in a Windows 2000 machine before ftp'ing the .class file to the Solaris server machine to run.

    it is possible that you are trying to run a program that is going to display a window on an X server, but you have not specified a display. You specifiy a display by setting the DISPLAY environment variable eg.
    setenv DISPLAY 10.0.0.1:0
    To check that runtime.exec is working you should try to run a program that does not reqire access to an X Server. Try something like
    cmd = "sh -c 'ls -l > ~/testlist.lst'";
    alternatively try this
    cmd = "sh -c 'export DISPLAY=127.0.0.1:0;xterm '"
    you will also need to permit access to the X server using the xhost + command

  • Questions about using the Voice Memos app

    I'm currently an Android user, but will be getting an iPhone 6 soon. My most used app is the voice memos app on my Android phone. I have a couple questions about the iPhone's built-in voice memos app.
    -Am I able to transfer my voice memos from my Android phone to my iPhone, so my recordings from my Android app will show up in the iPhone's voice memos app?
    -When exporting voice memos from the iPhone to computer, are recordings in MP3 format? If not, what format are they in?
    -In your opinion, how is the recording quality of the voice memos app?

    You cannot import your Android voice memos to your iPhone's voice memo app.  You might be able to play the Android memos and have the iPhone pick up the audio and record it.
    Here is the writeup about sending voice memos from the iPhone to your computer (from the iPhone User Guide):
    App quality is excellent.

Maybe you are looking for