If you edit a DCR it Freeze out. It Freeze out if you scroll down in the Visual Format part.
I can not check the documentation right now but as far as I remember MS JVM is not supported type.
Which version of Client OS and which version, SP for IE/ browser are you using.Not sure if VFE uses JVM but CCI definitely does to render the templates.
try this approachhttps://support.interwoven.com/kb/kb_show_article2.asp?ArticleID=53439Using mod_expires Within iw-webd to Enhance Performance by modifying iw-home\iw-webd\conf\httpd.conf.template