tepidpond

Ah, it is on github. I looked earlier but couldn't find it. That would've saved me whole minutes in creating my fix. Expect a pull request shortly. Edit: Pull request sent.

Per MS support, that error exists only on Windows XP, and is fixed by uninstalling ".NET Framework 2.0" and reinstalling it as described here: http://support.microsoft.com/kb/908077

My computer now has all of the following Javas installed: 32-bit: JDK 7u7 JRE 7u7 64-bit: JRE 6u24 JDK 7u7 JRE 7u7 Installed them in the order of jre6, jdk7x32, jre7x32, jdk7x64, jre7x64. Running TechnicLauncher.exe from my normal account now results in a vanishing launcher as usual. But runas /user:"Test" TechnicLauncher.exe still gives the full launcher window opening and allows me to play the Technic pack. Multiple Javas is absolutely a complete non-issue. Also, for the technical-minded, Java is not in my path and JAVA_HOME is not set, so those are not necessary. I believe the launcher simply chooses the most recently installed 64-bit (or 32-bit on 32-bit systems) JRE that is available. Further to the point, this is instructive: public static void RunLauncher(string launcherPath) { string path1 = Program.GetJavaInstallationPath() ?? Program.LocateJavaFromPath() ?? Program.LocateJavaPath() ?? Program.LocateJavaFromProgramFiles(); if (path1 == null) { int num = (int) MessageBox.Show("Can't find java directory."); } else Process.Start(new ProcessStartInfo() { CreateNoWindow = true, WorkingDirectory = Application.StartupPath, FileName = Path.Combine(path1, "bin\\java.exe"), Arguments = string.Format("-jar {0}", (object) launcherPath), UseShellExecute = false }); Application.Exit(); } I've now decompiled and patched TechnicLauncher.exe to surround the path to technic-launcher.jar with quotes. It successfully loads the launcher on my computer with all five Javas installed, and a username with spaces in it. Are there any rules against sharing this patched version?

Unlikely. Each of the accounts I tested this from were brand new and had no migration performed or any configuration changes apart from installing Java. I'm nearly certain that this issue explains the vast majority of the "Launcher vanishes" problem reports.

I've read the thread. I've performed my tests with each of JDK7u6, JDK6u24, JRE7u6, JRE6u24 as the only installed Java. The version of the JRE is absolutely irrelevant to this issue, and that thread lists nothing about spaces in the username. And I'll test the possibility of multiple Java versions working shortly, I very strongly suspect that this is folklorish knowledge and not a problem whatsoever.

Launcher Version: 1.0.1.0 Operating System: Windows 7 Professional SP1 x64 Java Version: Java 6u24 x64, same applies to 7u6 x64 and presumably 32-bit as well. Antivirus Program: Microsoft Security Essentials Description of Problem: If you have this problem, skip to the bottom. If you're a dev, please read on. Launcher does not properly escape the filepath of technic-launcher.jar. Users who have a space in their username cannot use TechnicLauncher.exe to start Minecraft and must manually run technic-launcher.jar or miss out on the fun. To determine this use SysInternals Process Monitor from Microsoft TechNet (http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx) and use the right-click menu to include TechnicLauncher.exe. Clear the log, then from a user account containing a space launch TechnicLauncher.exe. ProcMon should now contain about 6500 log entries. From the bottom of the log page up once or twice and look for an entry labeled "Process Create"; and "C:\Program Files\Java\jre6\bin\java.exe" (If you see a full page of "ReadFile" and "C:\Users\username here\AppData\Roaming\.techniclauncher\technic-launcher.jar"; you're up too high and should scroll back down a little bit) When double-clicked, the Process Create entry will contain the following: Command line: "C:\Program Files\Java\jre6\bin\java.exe" -jar C:\Users\username here\AppData\Roaming\.techniclauncher\technic-launcher.jar Copying and pasting that command line into a cmd window gets you the error message: Unable to access jarfile C:\Users\username To fix this, TechnicLauncher.exe needs to be patched to surround the path to technic-launcher.jar with quotes, just as it already properly quotes the path to java.exe. Note: I've verified this with two identical brand-new user accounts "Test" and "Test 2" and calling "runas /user:Test TechnicLauncher.exe" and "runas /user:"Test 2" TechnicLauncher.exe". "Test 2" exhibits the problem, "Test" brings up launcher window exactly as it should. Work-around if you have this problem: You must create a new Windows user whose name contains NO SPACES, and only use TechnicLauncher from that username. Error Messages: Unable to access jarfile C:\Users\username Error Log: No logs as technic-launcher.jar never actually gets loaded.