Thank you, Christoph. It will be prioritized and assigned to Oracle engineer soon. If you are interested to get it evaluated more quickly feel free to propose a patch on this alias and it will be reviewed and sponsored.


On 02/22/2018 04:54 AM, Langer, Christoph wrote:


I’ve opened a bug for this:

Best regards


*From:*Semyon Sadetsky []
*Sent:* Dienstag, 9. Januar 2018 17:46
*To:* Weidemann, Matthias <>;; Langer, Christoph <> *Cc:* Woersinger, Rolf-Martin <>; Denkel, Christian <> *Subject:* Re: <AWT Dev> Unwanted MOUSE_MOVED break dispatching MOUSE_RELEASED to the right component

Hello Matthias,

If so, please, file a bug to


On 01/09/2018 12:09 AM, Weidemann, Matthias wrote:

    Hello Sadetsky,

    The discussion you linked to me seems to be a similar problem, but
    the fix discussed there happens specifically in the method
    Container.retargetMouseEnterExit(…). The problem we have happens
    in MOUSE_MOVED, so while this fix might fix the problem in the
    discussion it won’t fix ours.

    Kind Regards,


    *From: *Semyon Sadetsky <>
    *Date: *Monday, January 8, 2018 at 10:55 PM
    *To: *"Weidemann, Matthias" <>
    <>, ""
    <> <>
    *Cc: *"Woersinger, Rolf-Martin" <>
    <>, "Denkel, Christian"
    <> <>
    *Subject: *Re: <AWT Dev> Unwanted MOUSE_MOVED break dispatching
    MOUSE_RELEASED to the right component

    Hi Matthias,

    Thank you for your e-mail.

    It seems a fix for this bug is already under discussion on this


    On 01/04/2018 04:56 AM, Weidemann, Matthias wrote:

        Hello everyone,

        we found a rare occurrence of a bug in JDK1.8 and onwards,
        might also occur earlier but we didn’t check for that.

        In some instances MOUSE_MOVED events occur between a
        MOUSE_PRESSED the component is remembered in an instance
        variable to send a corresponding MOUSE_RELEASED to it.

        The same instance variable is used for the MOUSE_MOVED Event,
        so if there are MOUSE_MOVED Events between a MOUSE_PRESSED and
        MOUSE_RELEASED the corresponding MOUSE_RELEASE will be
        reported to the "wrong" component.

        I attached a simple example to replicate the error.

        I included hardware specifications, because the occurrence
        fluctuates with the hardware used. We got the best results to
        reproduce with the Macbook and the magic mouse shown below.
        With a trackpad it is almost impossible to replicate.

        *How to:*Move the mouse in the blue rectangle VERY FAST from
        left to right or vice versa. Release the mousebutton near the
        end of the drag, while you are still in motion.

        We are using a workaround for this, the same custom queue
        built into the example. If we are between MOUSE_PRESSED and
        MOUSE_RELEASED we do not dispatch MOUSE_MOVED Events.

        We would still like to see this bug fixed or at least have
        different instance variables for MOUSE_PRESSED and MOUSE_MOVED
        so we get the MOUSE_RELEASE on the right component.

        Kind Regards,

        Matthias Weidemann

        *Matthias Weidemann
        *Software Developer, PI Technology UxP UI P&S (SE) Supp
        *SAP SE*, Opelstr. 6, 68789 St. Leon - Rot, Germany

        T +49 6227 7-45771 , E

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