Appian Grid

Question

We are encountering the following error in our Appian application:

ERROR com.appiancorp.record.service.visitor.DiscoverAllRecordBindings - Exception encountered in grid field tree visitor, falling back in try catch. java.lang.NullPointerException

This issue appears while working with a grid component (record-based or interface grid). There are no obvious breaking changes, but the error is being logged intermittently. 
 We suspect it may be related to: 
 
 Null values in grid field bindings 
 Record type relationships 
 Nested field references in grid columns 
 
 However, we are unable to pinpoint the exact cause. 
 
 What typically causes this DiscoverAllRecordBindings NullPointerException? 
 Are there recommended best practices to avoid this issue in grid configurations? 
 How can we effectively debug which field or binding is causing the problem? 
 
 Any guidance or suggestions would be greatly appreciated!

Stefan Helzle · Answer

Do you see this message in log files only? Does the grid work? If both is true, I suggest to either ignore it, or open a support case to make Appian aware of this minor issue.

Shubham Aware · Answer

Wrap relationship field references in if(isnull(...), "", ...) or use a custom record field with null-safe expressions instead of referencing relationship fields directly in grid columns.
After any Record Type schema change, verify all grid column fieldConfigs still point to valid fields.

Also you can try debug,
Temporarily remove grid columns one by one and reload - when the error stops, the last removed column is the culprit.

Appian Grid

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