Minimserver won't start

[Medium Otis]

Hello All.

Minimserver was running fine last week, but now it doesn't start.

l am running Win11 Pro 24H2 with the latest update KB5065426 as of 09/09/2025

I have uninstalled Minimserver/downloaded latest (as of 09/15/2025) and reinstalled the product.
I have uninstalled Java/downloaded latest (Ver. 8 update 461, released July 15, 2025) and reinstalled the product.

Restart.

Nothing.

I hope that I am overlooking something, but I would appreciate your comments about this issue.

Thank you.

The minimserver crash log follows:

MinimServer crash dump, produced at 20250915-155909.280

java.lang.UnsupportedClassVersionError: com/minimserver/ServerLauncher has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at org.jminim.core.ComponentClassLoader.findLocalClass(ComponentClassLoader.java:16​0)
at org.jminim.core.ComponentClassLoader.loadClass(ComponentClassLoader.java:94)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.jminim.core.Factory.newInstance(Factory.java:16)
at org.jminim.core.LauncherImpl.run(LauncherImpl.java:821)
at org.jminim.core.LauncherImpl.launch(LauncherImpl.java:126)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jminim.mlaunch.MinimLaunch.doLaunch(MinimLaunch.java:525)
at org.jminim.mlaunch.MinimLaunch.launch(MinimLaunch.java:150)
at org.jminim.mlaunch.MinimLaunch.launch(MinimLaunch.java:90)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jminim.launch.Launcher.launch(Launcher.java:88)
at com.minimserver.launch.LaunchServer.main(LaunchServer.java:38)

"AWT-EventQueue-0" id=23 WAITING
at sun.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@161479c6
at java.util.concurrent.locks.LockSupport.park(Unknown Source)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unkn​own Source)
at java.awt.EventQueue.getNextEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

"AWT-Windows" id=21 RUNNABLE (in native)
at sun.awt.windows.WToolkit.eventLoop(Native Method)
at sun.awt.windows.WToolkit.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

"AWT-Shutdown" id=20 TIMED_WAITING
at java.lang.Object.wait(Native Method)
- waiting on java.lang.Object@4313f5bc
at sun.awt.AWTAutoShutdown.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

"Java2D Disposer" id=19 WAITING
at java.lang.Object.wait(Native Method)
- waiting on java.lang.ref.ReferenceQueue$Lock@7f010382
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at sun.java2d.Disposer.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

"Attach Listener" id=5 RUNNABLE

"Signal Dispatcher" id=4 RUNNABLE

"Finalizer" id=3 WAITING
at java.lang.Object.wait(Native Method)
- waiting on java.lang.ref.ReferenceQueue$Lock@1e802ef9
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)

"Reference Handler" id=2 WAITING
at java.lang.Object.wait(Native Method)
- waiting on java.lang.ref.Reference$Lock@2b6faea6
at java.lang.Object.wait(Unknown Source)
at java.lang.ref.Reference.tryHandlePending(Unknown Source)
at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)

"main" id=1 RUNNABLE
at sun.management.ThreadImpl.dumpThreads0(Native Method)
at sun.management.ThreadImpl.getThreadInfo(Unknown Source)
at org.jminim.core.LogImpl.writeCrashDump(LogImpl.java:1249)
at org.jminim.core.LogImpl.printStackTraceSync(LogImpl.java:1174)
- locked org.jminim.core.LogImpl@778d1062
at org.jminim.core.LogImpl.printStackTrace(LogImpl.java:169)
at org.jminim.core.LauncherImpl.launch(LauncherImpl.java:132)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jminim.mlaunch.MinimLaunch.doLaunch(MinimLaunch.java:525)
at org.jminim.mlaunch.MinimLaunch.launch(MinimLaunch.java:150)
at org.jminim.mlaunch.MinimLaunch.launch(MinimLaunch.java:90)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jminim.launch.Launcher.launch(Launcher.java:88)
at com.minimserver.launch.LaunchServer.main(LaunchServer.java:38)

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