I have recently encountered something similar and cannot figure out what is causing it. I went away for a three day weekend and shut down my computer like any good nerd. When I got back, I booted it up, went to play/launch minecraft, and after the normal few seconds of thinking it simply opens the launcher again with the following. I've been searching around for a solution myself, but this is the only other place I have found with a similar issue.
Game Output tab: Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/jna/Platform at oshi.SystemInfo.<init>(SystemInfo.java:32) at g.<clinit>(SourceFile:16) at ave.<clinit>(SourceFile:147) at net.minecraft.client.main.Main.main(SourceFile:41) Caused by: java.lang.ClassNotFoundException: com.sun.jna.Platform at java.net.URLClassLoader$1.run(URLClassLoader.java:372) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:360) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 4 more Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
Darrah Ros
I have recently encountered something similar and cannot figure out what is causing it. I went away for a three day weekend and shut down my computer like any good nerd. When I got back, I booted it up, went to play/launch minecraft, and after the normal few seconds of thinking it simply opens the launcher again with the following. I've been searching around for a solution myself, but this is the only other place I have found with a similar issue.
Game Output tab:
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/jna/Platform
at oshi.SystemInfo.<init>(SystemInfo.java:32)
at g.<clinit>(SourceFile:16)
at ave.<clinit>(SourceFile:147)
at net.minecraft.client.main.Main.main(SourceFile:41)
Caused by: java.lang.ClassNotFoundException: com.sun.jna.Platform
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 4 more
Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release