-Xmx Problem

[TheYolocasut1]

For some reason, some programs will not run unless Java's Xmx is set to 512M in the environment variables. Arduino is one of these programs. My issue is when I play Minecraft with these settings, I run out of RAM. I usually play Minecraft with -Xmx5G. Am I supposed to change the setting every time I want to use a different Java application? Why do some programs fail to launch just because they have a lot of allocated RAM?

[Norm]

Using Environment variables for values that are unique to different applications won't work. It would be better to create shortcuts for each application. In that shortcut set the command line to the values you want for the program that is started.
For example, I have this as the Target in a shortcut to start a program:

C:\Windows\System32\java.exe -Xmx750M -cp %JAVA_RUN%\SlideShowApp.jar;DocumentViewerW.jar SlideShow.ImgIdxEditor

[TheYolocasut1]

Both Minecraft and Arduino use windows executables for launchers. I cannot figure out how to launch the program via command line. Also when I tried using a batch file to launch a jar, even though I had -Xmx512M in the command line, it still said "Picked up Java options -Xmx5G".

[Norm]

Did you remove the environment variable?

[jim829]

I did a search for "memory settings for minecraft" and found the following:

Did you check out this site? [Tutorial] Allocate more memory for minecraft - Tutorials and FAQs - Unmodified Minecraft Client Support - Support - Minecraft Forum - Minecraft Forum

Supposedly, there is a new launcher which lets you configure the JRE memory requirements. Note: For application problems based on Java, don't check Java sites; check the application sites. Most folks who have similar problems will report them there.

Regards,
Jim

[TheYolocasut1]

I was not aware that I needed to delete the environment variable. After doing that, the applications' built-in Java options were able to do their thing. Thank you.