I noticed yesterday when playing with a bunch of mods, Minecraft is being launched with forced java options. The environment variable _JAVA_OPTIONS is being set for the process only with a value of -Xmx512M. Limiting java's ram to half a gigabyte. All the user specified fields of the amount of ram to allocate is being overwritten by the -Xmx512M flag being appended to the JVM args string. At first, I thought this was only local and some issue with my instance of Minecraft, but it isn't. Today, in #minecrafthelp on esper, one user was complaining that their Minecraft was running slow. Upon closer inspection, he too was also running with 512M of ram even though more has been specified.

However, when running minecraft from the command line by executing "java -jar Minecraft.exe", the _JAVA_OPTIONS environment variable is not set.

Here is a (forced) crash report of my instance of minecraft with the issue: http://pastebin.com/NmnKLA39

Here is a (forced) crash report of the esper's minecraft instance: http://pastebin.com/ACpFTTMn

If it matters, here are my environment variables currently set on my system: http://pastebin.com/jQzqAFZq

Screenshot of minecraft log showing _JAVA_OPTIONS being picked up: http://puu.sh/cWHVD/c6d7e79dd3.png