I have a 6 MB file served from Glassfish through AJP/mod_jk and Apache 2. Downloading this using wget stops after approx 735 KB. If I truncate the file to e.g. 512KB downloading works fine.
Download works fine when accessing port 8080 directly, the problem is only through AJP. I've put the files in a directory under the docroot folder of domain 1.
I've set up a test case server and can also provide Amazon AMI image of this if you need this. The problem can be seen by trying downloading the following files:
original file (stalls):
truncated file (works fine):