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Thread: Forge minecraft 1.12.2

  1. #1
    Join Date
    Feb 2019
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    2

    Forge minecraft 1.12.2

    Hello I'm using ubuntu 18.04 and i would like to install forge on my minecraft launcher. I've already downloaded and install the last version of forge but when I launch minecraft there's a message error :

    OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
    Unrecognized VM option 'CMSIncrementalMode'
    Error: Could not create the Java Virtual Machine.
    Error: A fatal exception has occurred. Program will exit.

    After deleting "CMSIncrementalMode" in "JVM arguments", I launch a second time and I have a new message error :

    OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
    Exception in thread "main" java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader
    at net.minecraft.launchwrapper.Launch.<init>(Launch.j ava:34)
    at net.minecraft.launchwrapper.Launch.main(Launch.jav a:28)

    Could you help me ? Sorry if my english is approximate. Thanks.
    Last edited by jojodi974; February 3rd, 2019 at 06:36 AM.

  2. #2
    Join Date
    Jan 2006
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    Sunny Southend-on-Sea
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    6,425
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    Kubuntu 18.04 Bionic Beaver

    Re: Forge minecraft 1.12.2

    Minecraft (and especially mods) really wants Java 8, and the one from Oracle in particular. There is a PPA that has it.

  3. #3
    Join Date
    Feb 2019
    Beans
    2

    Re: Forge minecraft 1.12.2

    Thanks it works, I love you so much ! Have a nice day !

  4. #4
    Join Date
    Apr 2008
    Location
    Norwich CT
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    2,519
    Distro
    Ubuntu Mate

    Re: Forge minecraft 1.12.2

    Quote Originally Posted by CatKiller View Post
    Minecraft (and especially mods) really wants Java 8, and the one from Oracle in particular. There is a PPA that has it.
    And here it is: https://launchpad.net/~webupd8team/+archive/ubuntu/java

    I drink my Ubuntu black, no sugar.
    Ubuntu user 28819

  5. #5
    Join Date
    Feb 2008
    Location
    Texas
    Beans
    26,473
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: Forge minecraft 1.12.2

    Glad it worked, please use thread tools at the top of the page to mark the thread solved.

    Thanks

  6. #6
    Join Date
    May 2019
    Beans
    1

    Re: Forge minecraft 1.12.2

    I'm Having the same problem and i already downloaded java jre 8 form oracle like as what i saw on another post plz respond

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