However, for some reason, this was going awry. Normally, this sort of thing would work fine: every app server has its own variant of HttpServletRequest for its own uses, and it's perfectly reasonable to do this kind of unwrapping.

This, however, hits trouble within Liberty's ServletUtil class, which attempts to 'unwrap' the incoming HttpServletRequest object to find the core Liberty-specific object to use extended methods on. The short of it is that Krazo (the MVC implementation) passes JSP rendering along to the app container, rather than doing its own JSP work, which makes perfect sense. Once I set everything up on JEE 9 and MP 5, I hit this exception when trying to render a JSP via an MVC Controller object: : SRV.8.2: RequestWrapper objects must extend ServletRequestWrapper or HttpServletRequestWrapperĪt .(ServletUtil.java:89)Īt .ServletViewEngine.forwardRequest(ServletViewEngine.java:135)Īt .JspViewEngine.processView(JspViewEngine.java:58)Īt .ViewableWriter.writeTo(ViewableWriter.java:159)Īt .ViewableWriter.writeTo(ViewableWriter.java:1)Īt .$writeTo$1(ServerWriterInterceptorContext.java:79) Even with that non-beta version out, I found myself still on the beta track: I'm addicted to using MicroProfile Config, and MicroProfile's move to JEE 9 support is still itself in the RC stage. Until just this past week, Open Liberty supported JEE 9 only in beta releases - these have historically been plenty stable for me, but it's always asking for trouble. Though Jakarta EE 9 and 9.1 (the Java 11 official version) have been out for a bit, the switchover comes with the sort of turbulence one would expect. Since this is a clean new app, I really want to lean to the newest versions across the board, so I pegged my plans to that. In previous projects, such as this blog, I've used older versions of the software stack involved - basically, Jakarta 8, which is before the 'big bang' switch from the javax.* to jakarta.* package namespace. I was indeed able to do it, and I think the path I took is worth chronicling here. Well, I decided to go back and take a swing at trying to make JSP work in this case, since it's (still) a good engine for this purpose, and it could be a fun experiment. In that, I talked about how I've been going with Jakarta MVC for the front end, but ran into an odd problem with the latest versions in Open Liberty, and that was the impetus to tinkering with ERB. I mentioned in my last post that I've been tinkering with a modern structure for OpenNTF's web site as a side project.

Liberty basic software wrapper