How to estimate response time for an end to end web based j2ee application.

We want to know if there are techniques and approaches available for estimating a response time of an end to end web based j2ee aplication.
[146 byte] By [john_mavericka] at [2007-10-2 10:27:53]
# 1
You can use OpenSTA ( an open source tool)
galacka at 2007-7-13 2:08:51 > top of Java-index,Enterprise & Remote Computing,Enterprise Technologies...