gjt3,
Please note that some class changes cannot be hot swapped (e.g. if you change a method signature). Such changes require server restart or redeploy of the project for the changes to be picked up.
Does the hot deployment work on one project or not work on other projects? Or does the hot deployment not work consistently on one project?
Please refer to my response on this post for the settings required for hot deployment to work : https://www.genuitec.com/forums/topic/issue-with-code-deployment-unless-you-switch-to-classic-mode/#post-509703
If the issue persists, then please share with us the exact changes made to the Java classes that are not being hot deployed along with the project details (Web/EAR) and WAS server version to help us investigate further.
Apologies for inconvenience caused.
–Swapna
MyEclipse Support