Fix crash with recent Java 8 versions for old forge modpacks
This applies to old Forge modpacks that crashed on startup with the new versions of Java.
The crash may look as follows:
2024-02-28 10:35:15 [SEVERE] [Forestry] myrathi.flatsigns.FlatSigns failed validation. Halting runtime for security reasons. Please replace your mods with untampered versions from the official download sites.2024-02-28 10:31:56 [SEVERE] [ForgeModLoader] The minecraft jar file:/home/********/.var/app/org.prismlauncher.PrismLauncher/data/PrismLauncher/libraries/com/mojang/minecraft/1.6.4/minecraft-1.6.4-client.jar!/net/minecraft/client/ClientBrandRetriever.class appears to be corrupt! There has been CRITICAL TAMPERING WITH MINECRAFT, it is highly unlikely minecraft will work! STOP NOW, get a clean copy and try again!2023-01-23 16:10:09 [SEVERE] [Forestry] ic2.core.IC2 failed validation. Halting runtime for security reasons. Please replace your mods with untampered versions from the official download sites.Solution
-
Create a file named
java.securityinside the instance minecraft(.minecraft/minecraft) folder with the following content:jdk.certpath.disabledAlgorithms=MD2, MD5, SHA1 jdkCA & usage TLSServer, \ RSA keySize < 1024, DSA keySize < 1024, EC keySize < 224, \ include jdk.disabled.namedCurves jdk.jar.disabledAlgorithms=MD2, MD5, RSA keySize < 1024, \ DSA keySize < 1024, \ include jdk.disabled.namedCurves -
Open Edit instance window
-
Navigate to Java Setting
-
Check the Java arguments checkbox
-
Paste
-Djava.security.properties=java.securityinside the java arguments text box
Sources
- https://gist.github.com/ThePixelbrain/a0fe3231b9a9d71d910e7f71895e0196
- https://github.com/PrismLauncher/PrismLauncher/issues/747#issuecomment-1850676378
Pages in Help pages:
- APIs
- ATLauncher
- Custom Commands
- Environment variables
- FTB
- CurseForge
- Version
- Instance Copy
- Java Settings
- Language Settings
- Launcher Settings
- Mods
- Minecraft Settings
- Miscellaneous
- Mod Downloader
- Modrinth
- Notes
- Proxy Settings
- Screenshots
- Technic
- External Tools
- Vanilla
- Worlds
- Import
Comment Rules
By submitting a comment, you agree to uphold the Prism Launcher Code of Conduct.
✅ What user-contributed comments are for
- Share additional information relevant to the article.
- Mention a workaround for a common issue.
- Link to useful third-party resources that are relevant to the current page, such as tutorials or articles.
- It is allowed to occasionally link to resources you've created. When doing so, you must disclose your affiliation with the resource in some way. However, linking to resources you've created should not represent the majority of your interactions with user notes. Excessive self-promotion is not allowed and will be moderated away.
🚫 What user-contributed comments are not for
- Do not point out something in the documentation being incorrect or outdated.
- Instead, open an issue on the prismlauncher.org issue tracker. If you can, please open a pull request to improve the documentation.
- You can use the Edit button at the bottom of each documentation page for this purpose.
- Do not ask support questions. Please use other community platforms instead.
- Do not submit bug reports. Please use the main Prism Launcher repository's issue tracker instead.
- Do not submit feature requests. Please use the Prism Launcher repository's issue tracker repository instead.
- Do not post off-topic comments. Comments must be strictly related to the page they are linked to.
Comments not following the above rules will be removed.
Licensing of user-contributed comments
Launcher contributors may occasionally go through the comments and may incorporate information from them in the documentation. By submitting a comment, you accept that it may be incorporated in unmodified or modified form in the launcher and/or documentation, subject to the GPL-3.0 license for the launcher and AGPL-3.0 license for the documentation.