Exception without message fails to send to Application Insights

[petergphillips]

Expected behaviour

Exceptions are sent to application insights and appear in AppExceptions

Actual behaviour

Warning appears in our kubernetes pod logs

2025-07-08 09:03:51.485+01:00 WARN  c.a.m.o.a.i.p.TelemetryPipeline - Sending telemetry to the ingestion service: Received response code 206 (109: Field 'message' on type 'ExceptionDetails' is required but missing or empty. Expected: string) (future warnings will be aggregated and logged once every 5 minutes)

To Reproduce

See UserController.java in microsoft/ApplicationInsights-Java-Repros#15.

Any exception that doesn't have a message (e.g. new NullPointerException()) is rejected by Application Insights.

System information

Please provide the following information:

• SDK Version: 2.6.4, Java Agent 3.7.3
• OS type and version: eclipse-temurin:21-jre-jammy
• Application Server type and version (if applicable): Spring Boot 3.5.3
• Using spring-boot? Yes