production — us-east-1
acme-api · v3.12.4
0
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Executive Summary
HIGH </> Java
acme-api[web]-nullpointerexception:fa6783447db1
Mar 18, 2026 21:28 75352ms
Confidence
62%
A NullPointerException is thrown inside TokenService.validateSession(TokenService.java:281) during the webhook request flow, indicating validateSession dereferences a null value (most likely a missing or expired session token, or a null lookup result).
Possible Root Causes
#1 validateSession() assumes a non-null session token but the lookup returns null for this request, and line 281 dereferences it without a guard.
72%

Evidence For

NPE originates precisely in TokenService.validateSession, which by name reads token fields that are commonly null when a session has expired or was never created.

validateSession is called from processRequest (WebhookController.java:125) in a controller webhook flow; payloads often contain only a user identifier.

Evidence Against

No matched source snippet is provided for TokenService.java around line 281, so the exact dereferenced variable cannot be confirmed.

#2 A dependency used inside validateSession() (e.g., an HTTP client/config value) is null due to mis-wiring or conditional bean creation.
48%
Steps to Reproduce
1
Prepare a local/staging environment with the application running and webhook endpoint reachable.
2
Create or choose a user in the webhook payload that does NOT have a corresponding session token stored.
3
Send an HTTP POST to the webhook endpoint with that payload — observe a 500 and the NPE at TokenService.validateSession:281.
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Issue #4821 created → assigned to @copilot
Solve · Root Cause #1 · TokenService.validateSession · 72% confidence
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↳ Reading TokenService.java
↳ Found null dereference at line 281 — token.getExpiresAt()
↳ Tracing 3 callers · all route through WebhookController
↳ Root cause confirmed · generating patch
src/main/java/.../TokenService.java +8 −2
AI Explanation
fix: add null guard in TokenService.validateSession
trace/fix-4821-null-pointer → main
CI Build · passing
Tests · 142 / 142 passing
No regressions detected
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