I have C# program that runs multiple commands using "cmd.exe" process. The process is simple: create "cmd.exe" with no window, redirect StandardInput/Output and Error. I write commands to Input and read Output for messages. When some message appears I can run something else.

var cmd = CreateCmdExeProcess();
cmd.StandardInput.WriteLine("mvn clean install");
cmd.StandardInput.Flush();
....
cmd.StandardInput.WriteLine("echo FINISHED");
cmd.StandardInput.Flush();

This was working fine until someone added maven-exec-plugin that runs some .bat file. Now "FINISHED" at the end is never on the output. This is not problem with called bach script, because if I remove all content and leave only "echo" inside, I see it is executed, but all the rest is just not seen.