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Unable to publish the Discovery pattern

NirmalSharma
Tera Contributor

3 weeks ago - last edited 3 weeks ago

Hi Experts,

 

I am seeing a weired error in my instance wherein I m not able to publish the pattern. I have checked each and every step with utmost attention and could not find any syntax error. 

 

Things I have checked are:

- Syntax errors in each step.

- Pattern Scope

- Steps deactivation/activation strategy.

 

Everytime I hit publish button it always shows that that error message as shown below.

 

NirmalSharma_0-1761584398677.jpeg

 

in the logs I could find only this traceback message and nothing else which could explain it any further.

 

(48)PatternDesignerProcessor - problems when invoke method: activatePattern: java.lang.reflect.InvocationTargetException:   java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
  java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  java.base/java.lang.reflect.Method.invoke(Method.java:569)
  com.snc.ng.pattern.designer.processor.PatternDesignerProcessor.doProcess(PatternDesignerProcessor.java:140)
  com.snc.sw.ui.processors.SaBaseProcessor.doProcessInDomainScope(SaBaseProcessor.java:97)
  com.snc.sw.ui.processors.SaBaseProcessor.process(SaBaseProcessor.java:70)
  com.glide.processors.AProcessor.runProcessor(AProcessor.java:884)
  com.glide.processors.AProcessor.processTransaction(AProcessor.java:343)
  com.glide.processors.ProcessorRegistry.process0(ProcessorRegistry.java:187)
  com.glide.processors.ProcessorRegistry.process(ProcessorRegistry.java:175)
  com.glide.ui.GlideServletTransaction.process(GlideServletTransaction.java:58)
  com.glide.sys.Transaction.run(Transaction.java:2804)
  com.glide.ui.HTTPTransaction.run(HTTPTransaction.java:35)
  java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
  java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
  java.base/java.lang.Thread.run(Thread.java:841)

 

 

Thanks,

Nirmal Sharma

 

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3 REPLIES 3

pratikjagtap
Giga Guru
Giga Guru

3 weeks ago

Hi @NirmalSharma ,

 

Possible Causes:

  1. Syntax errors in the NDL file.
  2. Missing required fields or incorrect structure.
  3. Unsupported values or parameters.
  4. Version mismatch between the pattern and the platform.

Recommended Actions:

  • Open the System Logs in the application to find the exact error details.
  • Validate the NDL file against the expected schema or format.
  • If available, use a built-in NDL validator or run a dry-run before publishing.
  • Check documentation for NDL requirements.

If my response helped, please hit the 👍Thumb Icon and accept the solution so that it benefits future readers.

 

Regards,
Pratik

0 Helpfuls

NirmalSharma
Tera Contributor
In response to pratikjagtap

3 weeks ago

What is NDL validator and where do I find it? I checked all syntax and everything as well I kept a very simple set parameter value step only to test it out but still it kept me showing the same errors.

0 Helpfuls

pratikjagtap
Giga Guru
Giga Guru
In response to NirmalSharma

3 weeks ago

 

  • Pattern Designer in ServiceNow:
    • Navigate to:
      Discovery > Patterns > [Select Pattern] > Edit
    • When you click Publish, the system automatically runs the NDL Validator.
    • If there are issues, you’ll see an error message like “Unable to publish pattern due to invalid NDL. Please refer to System Logs for more information.”
  • System Logs:
    • Go to System Logs > All and filter by the pattern name or error message to see detailed validation errors.

 

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