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Fix ipv6 only servers #16

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Fix ipv6 only servers #16

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2cb531c
unset preferIPv4Stack after installer, fixing ipv6 only servers
Schmarni-Dev Jul 8, 2026
dcd6ad0
use camelCase for preferIpv4StackUnset
Schmarni-Dev Jul 8, 2026
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6 changes: 5 additions & 1 deletion src/main/java/io/github/zekerzhayard/forgewrapper/installer/Installer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -42,7 +42,8 @@ public static Map<String, Object> getData(File librariesDir) {

public static boolean install(File libraryDir, File minecraftJar, File installerJar) throws Throwable {
ProgressCallback monitor = ProgressCallback.withOutputs(System.out);
if (System.getProperty("java.net.preferIPv4Stack") == null) {
boolean preferIpv4StackUnset = System.getProperty("java.net.preferIPv4Stack") == null;
if (preferIpv4StackUnset) {
System.setProperty("java.net.preferIPv4Stack", "true");
}
String vendor = System.getProperty("java.vendor", "missing vendor");
Expand All @@ -55,6 +56,9 @@ public static boolean install(File libraryDir, File minecraftJar, File installer
// MinecraftForge has removed all old installers since 2024/2/27, but they still exist in NeoForge.
PostProcessors processors = new PostProcessors(wrapper, true, monitor);
Method processMethod = PostProcessors.class.getMethod("process", File.class, File.class, File.class, File.class);
if (preferIpv4StackUnset) {
System.clearProperty("java.net.preferIPv4Stack");
}
if (boolean.class.equals(processMethod.getReturnType())) {
return (boolean) processMethod.invoke(processors, libraryDir, minecraftJar, libraryDir.getParentFile(), installerJar);
} else {
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