I don't know whether the issues below were already fixed. But I had that with RedHat Developer Studio Beta 1
1.) I work with MyFaces Tomahawk which is present in the "Red Hat Palette". If I tip <t: and push Strg+Space, I get an exception: "Content Assist" did not complete normally. Please see the log for more information. java.lang.NullPointerException.
2.) There isn't a file association for CSS files in Window --> Preferences --> General. Therefore I cannot open any *.css files. I get an exception:
"An error has occurred. See error log for more details. org.eclipse.wst.css.core.internal.document.CSSModelImpl cannot be cast to org.w3c.dom.Node".
3.) My web.xml has an filter entry
<filter> <filter-name>SecurityFilter</filter-name> <filter-class> ip.client.commons.web.secfilter.filter.SecurityFilter </filter-class> <init-param> <param-name>config</param-name> <param-value> /WEB-INF/securityfilter-config.xml </param-value> <description>Configuration file location</description> </init-param> </filter>