# hard crash on vtk 8
**URL:** https://discourse.vtk.org/t/hard-crash-on-vtk-8/894
**Category:** Support
**Created:** [May 2, 2019, 3:42pm UTC](https://discourse.vtk.org/t/hard-crash-on-vtk-8/894 "2019-05-02T15:42:32Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Gilthalas](https://discourse.vtk.org/u/Gilthalas)
#### Post date: [May 2, 2019, 3:42pm UTC](https://discourse.vtk.org/t/hard-crash-on-vtk-8/894/1 "2019-05-02T15:42:32Z")
We currently have an app that runs on vtk 6.3, using Java, and we’re working on getting things to run on 8.1.2. We’ve built the new libs, and updated DYLD\_LIBRARY\_PATHs accordingly to point to the new jnilibs.
I’m getting a fatal error from a deg fault that is dumping info to a hs\_err file (I would attach it but I am too new to the discourse to do so). The top of the stack in that file is:
`j vtk.vtkGenericOpenGLRenderWindow.Render_31()V+0`
`j vtk.vtkGenericOpenGLRenderWindow.Render()V+1`
`j vtk.rendering.jogl.vtkAbstractJoglComponent$1.display(Lcom/jogamp/opengl/GLAutoDrawable;)V+16`
`j jogamp.opengl.GLDrawableHelper.displayImpl(Lcom/jogamp/opengl/GLAutoDrawable;)V+62`
`j jogamp.opengl.GLDrawableHelper.display(Lcom/jogamp/opengl/GLAutoDrawable;)V+2`
`j com.jogamp.opengl.awt.GLJPanel$Updater.display(Lcom/jogamp/opengl/GLAutoDrawable;)V+200`
Which to me looks like a JNI problem, but I’m not sure. Any thoughts on this? We’d really like to modernize our app, and this is a major hurdle. Thanks!
Josh
---
### Author:  [@Sebastien\_Jourdain](https://discourse.vtk.org/u/Sebastien_Jourdain)
#### Post date: [May 2, 2019, 5:18pm UTC](https://discourse.vtk.org/t/hard-crash-on-vtk-8/894/2 "2019-05-02T17:18:06Z")
To make sure it is not a build issue of VTK, can you reach out to me privately so I can share a VTK build for macOS so you can try it out?
---
### Author:  [@Gilthalas](https://discourse.vtk.org/u/Gilthalas)
#### Post date: [May 2, 2019, 7:19pm UTC](https://discourse.vtk.org/t/hard-crash-on-vtk-8/894/3 "2019-05-02T19:19:57Z")
Best way to do that?
---
### Author:  [@Sebastien\_Jourdain](https://discourse.vtk.org/u/Sebastien_Jourdain)
#### Post date: [May 2, 2019, 8:10pm UTC](https://discourse.vtk.org/t/hard-crash-on-vtk-8/894/4 "2019-05-02T20:10:30Z")
email [firstname.lastname@kitware.com](mailto:firstname.lastname@kitware.com)
---
### Author:  [@Gilthalas](https://discourse.vtk.org/u/Gilthalas)
#### Post date: [May 2, 2019, 8:12pm UTC](https://discourse.vtk.org/t/hard-crash-on-vtk-8/894/5 "2019-05-02T20:12:28Z")
Sent, thanks!
---
### Author:  [@Gilthalas](https://discourse.vtk.org/u/Gilthalas)
#### Post date: [May 3, 2019, 1:29pm UTC](https://discourse.vtk.org/t/hard-crash-on-vtk-8/894/6 "2019-05-03T13:29:52Z")
OK, so it looks like the prebuilt libs seemed to get past my problems. Now I’m working on making sure I can build them myself.
My one concern is that the vtk-superbuild project only refers to a max of VTK7 (the BUILD\_VTK7 flag, for example) - if that flag is set it will use OpenGL2, otherwise it uses OpenGL. I’m going to run it with that flag set to true (even though I am building VTK8.2), but that flag should probably be renamed if it is valid for anything \> VTK 7. I’ll report back here when I know more.