Eclipse Community Forums: OCL » Validate OCL from ecore standalone => Exception java.lang.NullPointerException: null

Home » Modeling » OCL » Validate OCL from ecore standalone => Exception java.lang.NullPointerException: null

Validate OCL from ecore standalone => Exception java.lang.NullPointerException: null [message #1784293]

Mon, 26 March 2018 06:46

Eclipse User

I tried to set up a standalone application which would validate the OCLs emebedded in the ecore like they are validated in the generated Editor.
I used the code posted inside
https://www.eclipse.org/forums/index.php/m/754946/?srch=standalone+ecore#msg_754946
as a template but after solving the build-path-issues I do not get further than

An exception occurred while delegating evaluation of the 'MyConstraintName' constraint on 'csfam.impl.SwcImpl@20f12539{file:/C:/.../mymodel.csfam#//@modules.0}': java.lang.NullPointerException: null

Is there any template for a standalone application performing those OCL-Checks mentioned in ecore?

Re: Validate OCL from ecore standalone => Exception java.lang.NullPointerException: null [message #1784298 is a reply to message #1784293]

Mon, 26 March 2018 08:04

Eclipse User

Hi

It should work, but...

quite possibly you did not solve the build path issues correctly

an NPE is a legitimate although not very helpful diagnosis; perhaps your test model or more likely test harness is bad

Wiithout a repro, your report is really not much more help that an "it doesn't work" report.

Not sure what you mean by "those OCL-Checks mentioned in ecore".

Regards

Ed Willink

Re: Validate OCL from ecore standalone => Exception java.lang.NullPointerException: null [message #1784299 is a reply to message #1784298]

Mon, 26 March 2018 08:10

Eclipse User

Thanks, Ed, what would you Need to continue discussion here: Since it is possible a build-path-issue the code and Modell would not be enough, but I would Need to communicate the complete Project Setup with all libraries (how)?

Re: Validate OCL from ecore standalone => Exception java.lang.NullPointerException: null [message #1784302 is a reply to message #1784299]

Mon, 26 March 2018 08:26

Eclipse User

Hi

Generally a zipped project. See https://wiki.eclipse.org/OCL/ForumNetiquette

Regards

Ed Willink

Re: Validate OCL from ecore standalone => Exception java.lang.NullPointerException: null [message #1784305 is a reply to message #1784302]

Mon, 26 March 2018 09:05

Eclipse User

Thanks, Ed, I attached the important part of an example Project and hope you find everything necessary. If not, feel free to request additional Information / artifacts.
Thanks for investigating.

Attachment: workspace.zip
(Size: 138.94KB, Downloaded 218 times)

Re: Validate OCL from ecore standalone => Exception java.lang.NullPointerException: null [message #1784311 is a reply to message #1784305]

Mon, 26 March 2018 11:16

Eclipse User

Hi

Somehow you are mixing and matching the old (org.eclipse.ocl.ecore..., org.eclipse.ocl.uml...) and the new (org.eclipse.ocl.pivot..., org.eclipse.ocl.xtext...) OCL facilities. Please try to identify what steered you towards your init_OclStuff() solution so that I can try to help others avoid the same pitfalls. Unfortunately, while the new code supports the same textual language, the underlying models and API are improved, so it is not a drop-in replacement and I'm not yet ready to force the new as the default. Consequently there are opportunities for mixing and matching that I need to tackle.

If you replace init_OclStuff() by EssentialOCLStandaloneSetup.doSetup(), it works, or rather reports what is probably a genuine validation failure.

Diagnosis of xDemoVal.impl.ObjImpl@7ce69770{file:/E:/Development/Rusa/Workspace/workspace.zip_expanded/XDemoValStandAlone/My.xdemoval#/}
The 'Value_must_be_greater_than_zero' constraint is violated on 'xDemoVal.impl.ObjImpl@7ce69770{file:/E:/Development/Rusa/Workspace/workspace.zip_expanded/XDemoValStandAlone/My.xdemoval#/}'

Did you look at the standalone init section of the OCL Documentation?

You will find that it is worthwhile exploiting the auto-classpath generation of Plugin Projects and MANIFEST.MF for standalone projects too.

Regards

Ed Willink

Re: Validate OCL from ecore standalone => Exception java.lang.NullPointerException: null [message #1784413 is a reply to message #1784311]

Tue, 27 March 2018 14:15

Eclipse User

Many thanks, Ed.
If I remember correctly, next to the Forum entry cited above, the following was leading me into the not-completely-right direction:
- Without any initialization of the OCL stuff I ran a Diagnostician, which then reported "...Unable to find delegate to evaluate the..." which led me to the page
https://wiki.eclipse.org/OCL/FAQ#Unable_to_find_delegate_to_evaluate_the_.27....27_constraint_on_.27....27:_http:.2F.2Fwww.eclipse.org.2Femf.2F2002.2FEcore.2FOCL

Thanks again and best regards

Re: Validate OCL from ecore standalone => Exception java.lang.NullPointerException: null [message #1784465 is a reply to message #1784413]

Wed, 28 March 2018 05:19

Eclipse User

Hi

Thanks. I refresh the OCL Documentation every so often. The Wiki and in particular the FAQs need some serious attention. Will do.

Regards

Ed Willink

Previous Topic:	Generic Enumeration Literal
Next Topic:	Code Generation with external ocl document

Goto Forum:

-=] Back to Top [=-

Current Time: Wed Jul 23 16:17:57 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter