FIXED: "Invalid type owner for DynamicMethod" error in Nhibernate

By -
If you recieve the "Invalid type owner for DynamicMethod" error while initializing you NHibernate SessionFactory then it's pretty likely that you are using generic methods on some of your lazy loaded/proxied classes.

Nhibernate incorporates a reflection optimization that speeds up the creation of proxy classes. This reflection optimization does not play well with generics. The error it throws is "Invalid type owner for DynamicMethod". Not very friendly.

So, to fix this you must either stop using generic methods OR turn off the optimization. To turn off the optimization you must run the following code before you initialize your SessionFactory.

NHibernate.Cfg.Environment.UseReflectionOptimizer = false;

Comments

Unknown said…
Its really an informative submit for the readers who facing such a problem of "Invalid type owner for DynamicMethod" and getting very effective solution for it. Actually I was going to write an essay paper for my education. And will it be helpful my education. Lets ask with dissertation writing service and they will help to write about any kind of informative topic.
Friday, October 13, 2017 11:11:00 PM
https://g.page/duct-cleaning-richmond-hill?share said…
Continue on inspiring us with your writing! Keep on sharing.
Rochester Hills
Tuesday, August 17, 2021 3:26:00 PM
Bilal said…
nice information...Good blog. If you want want know, more click here.
uwatchfree
filmy4wep
jaa lifestyle login
lay on hands dnd 5e
Sunday, April 03, 2022 5:58:00 AM
auditing dissertation topics said…

It sounds like you've run into a tricky situation with Nhibernate. The "Invalid type owner for DynamicMethod" error can be a difficult one to debug. Fortunately, there are some good resources out there that can help you troubleshoot the issue. It is important to make sure that you are using the correct type for the owner when creating a dynamic method. If you are still having trouble, it may be best to reach out to an experienced Nhibernate user for advice.
Monday, December 26, 2022 5:14:00 AM
Contract Law Dissertation Topics said…
Creation of proxy pages is speedy up through Nhibernate incorporates a reflection optimization
Tuesday, December 27, 2022 6:40:00 AM
john oliver said…
The OnePlus 9 for sale is an absolute steal! With its impressive camera technology and lightning-fast performance, it's a smartphone that truly stands out. I've been waiting for this opportunity to grab one at such a great price.
Saturday, August 26, 2023 2:27:00 PM
Cass said…
This comment has been removed by the author.
Wednesday, August 20, 2025 4:56:00 AM
Cass said…
One of my favorites! More content, please. Commercial Roof Repairs
Wednesday, August 20, 2025 4:58:00 AM
Luna Morris said…
Great fix! This explanation of the NHibernate 'Invalid type owner for DynamicMethod' error is clear, practical, and very helpful for devs. fractional cfo
Thursday, July 02, 2026 3:28:00 AM
Post a Comment

Popular posts from this blog

New Pattern: CPT (Can't Polish a Turd)

By -
I recently read a hilarious article, " Asshole Driven Development ." The author, Scott Berkun, takes a cynical look at the abundance of acronyms in the software engineering field. Along the way he uncovers a few insights that, while very cynical, ring true. In addition to Scott's funny acronyms many users have added additional goodness. One anonymous post read: How about CPT (Can’t Polish a Turd) development, This is where management cannot understand the need to stop and fix/clean up/refactor or start again. I saw this post and wondered if we hadn't worked together! I've polished many turds in my time, a few were my own, and let me tell you...it's not easy. The fact is, these turds never really shine. Sure, sure...wet em down a bit...put em in the right light and they seem to shine. Heck...we have well paid people (some brilliant) that spend most of their time putting turds, in the right light. But, in the end a turd by any other name is still crap. So why ...
Read more

Getting the Data out of my Controller Tests

By -
While working on PlanningPokerOnRails I started writing a unit test for my LoginController. The Monorail BaseControllerTest makes this easy. I am also using Rhino Mocks and Nunit . Here is the test: The test is very simple. First, it sets a single recorded expectation that a Redirect will occur: 34 using (mocks.Record()) 35 { 36 // First redirects to the index page 37 Response.Redirect( "/Home/Index.rails" ); 38 } Next, the playback is run and the code emulates a few things that users might do...like login with Request params for a ReturnUrl: 39 using (mocks.Playback()) 40 { 41 Request.Params.Add( "ReturnUrl" , "/Home/Index.rails" ); 42 loginController.Login( "dan" , "danny" ); 43 } Writing the Code to Pass this Test Next I wrote the CardPlayer component (my user) and the LoginController. Seeking to do the simplest thing that could possibly work I merely had the CardPlayer inherit from the ActiveRecord ...
Read more

Microsoft MVC or Is the Monorail off it's track?

By -
For those of you who didn't know, Microsoft has been working on it's own MVC framework . I haven't used it yet since I am in the middle of testing several Web-testing tools for an upcoming article. That said, I have done a little research on the web and here are a few things that Monorail users may want to know: Hammett , the founder of Castle::Monorail, has helped MS by making suggestions about their implementation. See his comment below: I'm not actively collaborating with MS regarding the MS MVC. I've offered help due to my expertise with complex web sites we have built using MonoRail, I was invited to fly to Redmond and analyze their product, and discuss things, make suggestions. It's been suggested (in comments) that Monorail may become a wrapper for the MS Framework, if the MS MVC framework progresses well. The MS Framework does support intellisense in it's views. Views are written in your .Net language of choice. ASP.Net controls are available for u...
Read more