Information about jni.h

Hi,
I want to know about the JNI functions that are being used in the native code , eg c or c++ .
Take the example of the function GetObjectClass. Now this has been defined in jni.h as
jclass GetObjectClass(jobject obj) {
return functions->GetObjectClass(this,obj);
where functions is defined in struct JavaVM_ as
const struct JNIInvokeInterface_ *functions;
Now when I look into struct JNIInvokeInterface_ there is no mention of the GetObjectClass. Then where does this function come from. Is it here in libjvm.so or what?
Please explain me the same.
Thanks and Regards,
Anand

In general I would say that the JNI functions "bottom out" in some native code inside the JVM. That native code may, in fact, ultimately call up to something in a jar, but it may not.
Regarding your example: one way you could check this is to take a look at the java source code, and find out if Object.getClass is entirely implemented in java, or calls a native implementation function.

Similar Messages

  • Get Information About Open Windows

    Hi everyone!!!!
    I'm trying to make some kind of bot, the primary Idea is to automatize tasks. To do this, it would be really usefull to have information about the windows that are open, for example, if I open the notepad, It has a title, width, height, 1 menu with file help, etc. and it also has 1 control inside, 1 text area with with, height, etc.
    So I know this can be done in Windows with the handler, I would like to know if there is a way to do this in JAVA and how.
    There's a software called AutoIt, that has a small program called AutoIt v3 Window Info. This software shows the info I need, using the Finder Tool, but I need to make my own.
    Thanks for any reply.
    Daniel

    Not in Java.
    You could possibly write some JNI that interfaces with the relevant MS Windows API,
    but that is no longer Java.

  • Information about interfaces

    HI all,
    now a computer can have a number of interfaces. e.g ethernet port, USB port, fire wire. All of these can be used for communication (let say connecting to the internet when i say communication ) however a few of them can be used for other purpose as well e.g. u can connect a mouse / external mememory to the USB port. then it doesnot function as a comuunication port.
    Now what i need to do is find out all the interfaces on the computer and find out whether it is being used as an communication interface (and also what kind of communication e.g. ethernet, 802.11a, 802.11b etc).
    So basically i need to get two things.. all the intefaces and the signatures of the different kind of devices attached to the interface so that i can discover the kind of device connected to the interface.
    Now the Network INterface class in java API gives the interfaces on the basis of IP address right? but i guess here i need to do a bit further and not just check for the IP address.
    Can anyone help me out here?? give me some hints/directions ?
    Thanks in advance
    Amitabh

    You could get the names of the Serial ports using the Java Comm API from IBM developer works and the java.net API to get the NIC card interfaces. This does not include the mouse and keyboard ports.
    The remaining stuff, as far as I know, is out of the realm of possibility for Java alone. As a rule of thumb, when you need detailed information about a system's hardware configuration, Java cannot help. You'd have to write some C/C++ JNI code to get them.

  • About JNI.***.dll already loaded in another class loader.

    About JNI.***.dll already loaded in another class loader.
    When I run a WEB program that use's JNI and DLL.The following excetpion information is throwed:
    .***.dll already loaded in another class loader.(string "***" represents a dll name).
    Help! Who can provide a solution.
    Thanks.

    i got the same problem before. seems it happens when
    you load the .dll not using static{ } block. And when
    your web application got an error and you fix it to
    restart your application without restarting your
    server, you will get this error message. You can
    either put load library stuff in the static{ } block
    or restart your server.And again.......
    If all you want is to have the dll loaded, and it is loaded (that is why the exception occurs) then it does not matter that the exception occurs. You can catch it and ignore it.

  • How to get information about creation of a virtual machine on a Hyper-v host.

    Hi,
    How to get information about creation of a virtual machine on a Hyper-v host?
    I need: host name, time created, creator user.
    I saw in Hyper-V-VMMS but I found info about movements of VM between hosts.
    Thank's in advance.
    Denius Valiant

    For Host Name * Created Time Use This Command In PowerShell 
    Get-VM -Name (Read-Host "Type Your Vm Name") |select CreationTime , ComputerName
    and for Create User , As i know you should see on Event Log . 
    Go To Event Log Viewer--->Applications And Services Logs--->Microsoft--->Windows--->Hyper-V-VMMS--->Operational 
    You can see in Event Log who create the Vm.
    Whenever you see a helpful reply, click on Vote As Helpful & click on
    Mark As Answer if a post answers your question.
    LinkedIn:
      Facebook:
      

  • A PDF document with information about activation for CS6 software

    Here's a PDF document with information about activation for CS6 software.
    I found it very useful for understanding how the system worked for activation of perpetual licenses, both in cases where the computer is and isn't connected to the Internet.

    Ann, with some browsers, the PDF document will download in the background rather than appear in a browser window.

  • I am using the Order Analysis Toolkit and want to get more information about the compensation for "Reference Signal Processing", which is scarce in the manuals, the website and the examples installed with the toolkit.

    I am using the Order Analysis Toolkit and want to get more information about the compensation for "Reference Signal Processing", which is scarce in the manuals, the website and the examples installed with the toolkit.
    In particular, I am analyzing the example "Even Angle Reference Signal Processing (Digital Tacho, DAQmx).vi", whose documentation I am reproducing in the following:
    <B>DESCRIPTIONS</B>:
    This VI demonstrates how to extract even angle reference signals and remove the slow-roll errors. It uses DAQmx VIs to acquire sound or vibration signals and a digital tachometer signal. This VI includes a two-step process: acquire data at low rotational speed to extract even angle reference; use the even angle reference to remove the errors in the vibration signal acquired at normal operation.
    <B>INSTRUCTIONS</B>:
    1. Run the VI.
    2. On the <B>DAQ Configurations</B> tab, specify the <B>sample rate</B>, <B>samples per channel</B>, device and channel configurations, and tachometer channel information.
    <B>NOTE</B>: You need to use DSA PXI-447x/PXI-446x and PXI TIO device in a PXI chassis to run this example. The DSA device must be in slot 2 of the PXI chassis.
    3. Switch to <B>Extract Even Angle Reference</B> tab. Specify the <B>number of samples to acquire</B> and the <B># of revs in reference</B> which determines the number of samples in even angle reference. Click <B>Start</B> to take a one-shot data acquisition of the vibration and tachometer signals. After the acquisition, you can see the extracted even angle references in <B>Even Angle Reference</B>.
    4. Switch to the <B>Remove Slow-roll Errors</B> tab. Click <B>Start</B> to acquire data continuously and view the compensate results. Click <B>Stop</B> in this tab to stop the acquisition.
    <B>ORDER ANALYSIS VIs USED IN THIS EXAMPLE</B>:
    1. SVL Scale Voltage to EU.vi
    2. OAT Digital Tacho Process.vi
    3. OAT Get Even Angle Reference.vi
    4. OAT Convert to Even Angle Signal.vi
    5. OAT Compensate Even Angle Signal.vi
    My question is: How is the synchronization produced at the time of the compensation ? How is it possible to eliminate the errors in a synchronized fashion with respect to the surface of the shaft bearing in mind that I am acquired data at a low rotation speed in order to get the "even angle reference" and then I use it to remove the errors in the vibration signal acquired at normal operation. In this application both operations are made in different acquisitions, therefore the reference of the correction signal is lost. Is it simply compensated without synchronizing ?
    Our application is based on FPGA and we need to clarity those aspects before implementing the procedure.
    Solved!
    Go to Solution.

    Hi CracKatoA.
    Take a look at the link bellow:
    http://forums.ni.com/ni/board/message?board.id=170&message.id=255126&requireLogin=False
    Regards,
    Filipe Silva

  • How do I use my serial number to find information about my MacBook Pro's Processor and RAM?

    So I want to find information about my MacBook Pro's processor and RAM using the serial number because the MacBook no longer works. I remember being able to find this information on the apple website before, maybe by using the coverage checker. Did they take this information out of the coverage checker? Is it no longer possible for a costumer to obtain this information?

    Append the last three characters of it to http://www.everymac.com/ultimate-mac-lookup/?search_keywords= and load the page.
    This won't reveal how much RAM it currently has installed.
    (117541)

  • Changing from dev to standard edition causes "Could not obtain information about Windows NT group/user error code 0x6e."

    Hello,
    We recently upgrade our SQL Server 2012 SP1 (64bit) dev edition to standard edition, after we purchased the required licence and it was deployed in production.
    Since the edition change, we are now receiving the following error, with some of our jobs, which have an e-mail step in them, which is causing the jobs to fail.
    Msg 14661,Level 16, State 1, Procedure sp_send_dbmail, Line 517
    Query execution failed: Msg 15404, Level 16, State 19, Server BL-SVR15, Line 1
    Could not obtain information about Windows NT group/user 'BLUELIZARD\savaa', error code 0x6e.
    Any ideas how to fix this issue? We were also having a similar error, when executing the jobs, but changing the job owner to SA has fixed this issue.
    Thanks,
    Andy.

    Hi,
    Which user account you used for SQL Server service, domain account or local account?
    If it is domain account, are you able to log in to a machine with it?
    Make sure that the password of account is not expired.
    Also, grant the user Allowed to Authenticate permission and see how it helps.
    Refer to the below article:
    http://geeks.ms/blogs/ozonicco/archive/2013/01/14/208266.aspx
    Thanks.
    Tracy Cai
    TechNet Community Support

  • Apc asset, information about payments and debts to a vendor

    Dear sap colleages
    I need to know these information about an ASSET:
    Purchased orders,
    Items from purchase orders,
    which of these items i've received, i've paid (also date), i've not paid ( amount of debt related to asset)
    payments in advanced (date),
    wich of these payments have been cleared (clearing date) and wich not,
    who is the vendor,
    other expenses (such as delivery)
    the amount of taxes,
    invoices related and NOT RELATED TO purchase order
    payments without invoice
    Which transactions do i need to follow?
    or
    Which document flow?
    or
    Which tables? Wich keys?
    or
    Is there a standard report that can give me such information?
    Any documentation and/or code will be appreciated.
    I need to program a report to integrate all these information.
    Thanks and Kind Regards

    Hi:
    Regarding payments to vendors,refer to FBL1N - Display/Change Line Items .
    Select the company code and then open items radio button and today date.It will show what are payments still to be paid to the vendor.If you select cleared items, it will show the payments paid to the vendor.If you select all items radio button, it will show all paid and unpaid payments to the vendor.
    Check this report whether it fills your requirment.
    When the user posts the business transaction, he has to input all the details, otherwise some of the information may be missing.
    Please let me know if you need more information.
    Assign points if useful.
    Regards
    Sridhar M

  • I've tried downloading iOS5 several times and after an hour each time I get a message that says my network connection has timed out.  But I can't find any information about "timing out" or how to correct the situation.  Any help?

    I've tried downloading iOS5 several times and after an hour each time I get a message that says my network connection has timed out.  But I can't find any information about "timing out" or how to correct the situation.  Any help?

    Disable your antivirus and firewall, and try again.

  • Report with information about release documents in VKM1

    Hello
    I need to know if exists some report that gives me more information about release documents in transaction VKM1. What user releases some document? How many documents a credit account had been release or block in a year or between dates?
    The transaction VKM2 just gives the release date of the document and not the user.
    Where I can find more information?
    Regards
    Daniel Teles

    Hi,
    There is a field to know which account is the parent account, but you can't have others informations from the parent account except the name. In the new R16, you have others field called "Parent Account external unique ID" and "Parent Integration ID". What can I do with this field? Is it possible to display the parent account phone field in the report?
    regards

  • Information about SAP Strategy Management (SAP SM)

    Hello,
    I want to know where I can find information about SAP Strategy Management (SAP SM). This is an application that was bought from PILOT.
    Is it easy to customize like the SEM-CPM-BSC????
    Is it an addon in the BW or ECC????
    Is it all browser type application???
    Thank you in advance...
    Pablo Mortera.

    Greetings Pablo,
    Thanks for your interest in SAP Strategy Management (SSM). More information can be found on the BPX site for Corporate Performance Management.
    https://www.sdn.sap.com/irj/sdn/bpx-cpm
    On that page is a short demonstration of SSM. There are two other sections on that page -"Key Topics" and "Best Practices" have links for more information about Strategy Management.
    On the SAP.com global site, there is also information about Strategy Management, including white papers.
    http://www.sap.com/solutions/performancemanagement/strategy/index.epx
    Please review all this information and let me know if you have additional questions about SAP Strategy Management.
    Regards,
    Bob

  • ITunes Match unable to complete "Gathering information about your iTunes library."

    All week I have been trying to get 2 separate iTunes accounts on 2  different Macbook on Air's both running iTunes 11.3.1(2) on Mavericks 10.9.5 - the progress bar crawls along and never actually reaches the end. Both iTunes Match accounts are completely empty (i.e. show zero media available on connected iOS devices). I have signed in and out of iTunes Match, deleted the libraries and re-added them etc. but the scan just isn't working.
    So, is iTunes Match being discontinued ahead of the announcements on 9/9 or is this a temporary glitch, or something thats just local to Spain?

    I'm having the exact same issue on a fresh windows 7 install...pretty annoying. After a few minutes of Genius in iTunes 9.0.2 gathering information about my music library my PC crashes and turns off. This is the only issue my computer has...help?

  • Clicking on "View more information about this update" for 31.5.0 does nothing

    I got a pop-up today that Thunderbird 31.5.0 is available. I clicked on "View more information about this update" because that usually takes me to the release notes and I prefer to read about updates and download and install them myself, rather than have the system do it for me. (I do this so I can save previous versions in case I run into a problem with the latest and want to go back.) But when I clicked on "View more information about this update" nothing happened. It didn't switch over to the browser nor start loading the release notes.

    About 5-10 minutes after I had clicked on "View more information about this update" a few times (and had manually gone to https://www.mozilla.org/en-US/thunderbird/31.5.0/releasenotes/ and downloaded and was in the process of installing the new release), my browser opened up three tabs on that page. I guess it was just a very delayed response.

Maybe you are looking for