Using extra Java flags before launcher minecraft

[RoughingIT]

Is there a way to add additional Java params before launching minecraft? With MagicLauncher, I can add the following flags -Dhttp.proxyHost=somehost -Dhttp.proxyPort=3128

In fact, I need to specify a proper proxy before I can login to minecraft. I launch technic launcher the following way:

java -Dhttp.proxyHost=somehost -Dhttp.proxyPort=3128 -jar ~/Downloads/technic-launcher-latest.jar

If I don't do it this way, I will fail to authenticate (our standard silent proxy gives a 403 error at this point). This is fine for playing on single player maps, but will fail if I tried SMP (403 error).

[freakachu]

there is, actually. you will need to make a very short (2 line) batch file. the trick is to create a folder called "rtemp" in the .techniclauncher folder before running the .jar with whatever java args you want. something like:

mkdir %appdata%\.techniclauncher\rtemp

java [insert args here] -jar %appdata%\.techniclauncher\technic-launcher.jar

[RoughingIT]

Thanks, that works well! I can see from my proxy logs that it's now doing more work, and I can now do tekkit things. I'm on linux, so the resulting command looks like this:

mkdir .techniclauncher/rtemp

java -Dhttp.proxyHost=localhost -Dhttp.proxyPort=3128 -jar ~/Downloads/technic-launcher-latest.jar

It's not documented anywhere though, either that or I missed it. It does look like a verbose debug session.

[freakachu]

the directory thing is not documented really, you're right. I only know about it because I saw the launcher dev, who's name I can't remember well enough to spell correctly (sorry, laser blasting mutated cow guy!), mention it in a thread once.

[Pilchard123]

Do you mean Agelian?

[freakachu]

Do you mean Agelian?

yes

[jakj]

I would like to launch the actual Minecraft instance with extra flags instead of the launcher. I tried checking the launcher's source, and it looks to me like it's directly loading classes and invoking them, rather than re-invoking the JVM, meaning the launcher invocation is the only time extra flags can be used. Is this true?