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Windows Defender flagging Java runtime when testing Android build environment

Sheeraz Ahmed 0 Reputation points
2025-10-25T10:23:06.4833333+00:00

hi everyone,

i’m setting up a lightweight java build environment on windows 10 for testing some android performance setups (mostly related to minecraft java emulation projects). everything runs fine until windows defender suddenly flags one of the runtime files as a potential threat — even though it’s from a verified source.

for example, when testing through my dev environment linked with Link removed the build gets interrupted mid-process with defender quarantine alerts.

i’ve already added folder exclusions and updated definitions, but the issue still pops up. is this a known false positive for certain java runtime builds, or am i missing a specific security setting to whitelist safely for dev use?

thanks in advance

Windows for home | Windows 10 | Security and privacy
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  1. Sin-D 4,435 Reputation points Microsoft External Staff Moderator
    2025-11-05T00:45:02.3366667+00:00

    Hi Sheeraz,

    Thank you for posting your question in the Microsoft Q&A Forum.

    Thank you for sharing your issue with Windows Defender flagging the Java runtime in your Android build environment.

    To help mitigate this, you have taken the correct initial steps by adding folder exclusions and ensuring security definitions are updated. Additionally, consider the following recommendations:

    • Temporarily disable real-time protection during trusted build sessions if your environment permits, to avoid interruption.
    • Submit the flagged files via the Microsoft Defender Security Intelligence portal for false positive analysis and resolution.
    • Avoid wholesale whitelisting of executables unless you are certain of their safety, to maintain overall system protection.

    If there are any updates from Microsoft on this detection or additional best practices, I will share those here.

    Thank you for your understanding and for contributing to the community. If you need any assistance and to follow up with me, feel free to ask me by clicking "Add Comment" or "Post Answer" if you cannot add comment. This helps me can read your follow up. Thanks for your effort.

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. 

    Best regards.

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