errorregressedcheckout-apijava

NullPointerException: Cannot invoke "String.length()" because "promoCode" is null for cart <uuid>

com.example.checkout.CartService#total

Events14
First seen16d ago2026-08-07 17:32:56 UTC
Last seen14d ago2026-08-09 10:28:51 UTC
Releases1.4.0
regression

This group was resolved in 1.7.0 and came back in 1.8.0, 14d ago. The fix did not hold.

Frequency

24 hours7 days30 days
Events per day, from the rollups14 in this window · peak 10
10
25 Jul
 
 
 
 
30 Jul
 
 
 
 
04 Aug
 
 
 
 
09 Aug
 
 
 
 
14 Aug
 
 
 
 
19 Aug
 
 
 
 
Table view
Bucket (UTC)Events
2026-07-25 00:00:000
2026-07-26 00:00:000
2026-07-27 00:00:000
2026-07-28 00:00:000
2026-07-29 00:00:000
2026-07-30 00:00:000
2026-07-31 00:00:000
2026-08-01 00:00:000
2026-08-02 00:00:000
2026-08-03 00:00:000
2026-08-04 00:00:000
2026-08-05 00:00:000
2026-08-06 00:00:000
2026-08-07 00:00:004
2026-08-08 00:00:000
2026-08-09 00:00:0010
2026-08-10 00:00:000
2026-08-11 00:00:000
2026-08-12 00:00:000
2026-08-13 00:00:000
2026-08-14 00:00:000
2026-08-15 00:00:000
2026-08-16 00:00:000
2026-08-17 00:00:000
2026-08-18 00:00:000
2026-08-19 00:00:000
2026-08-20 00:00:000
2026-08-21 00:00:000
2026-08-22 00:00:000
2026-08-23 00:00:000

How this group was decided

Every step below is a pure function of the event. The same event always produces the same group.

  1. 1 · Parse the stack trace

    5 frames parsed, 2 belong to the application. Only those decide the group — the same bug reaches the runtime through different framework paths depending on the request.

    • in-appcom.example.checkout.CartService.totalCartService.java:42
    • in-appcom.example.checkout.CheckoutController.submitCheckoutController.java:88
    • vendorjdk.internal.reflect.DirectMethodHandleAccessor.invokeDirectMethodHandleAccessor.java:103
    • vendororg.springframework.web.method.support.InvocableHandlerMethod.doInvokeInvocableHandlerMethod.java:255
    • vendororg.apache.catalina.core.ApplicationFilterChain.doFilterApplicationFilterChain.java:166

  2. 2 · Build the fingerprint input

    Line numbers are dropped so that editing a line above the throw site does not open a new group. Values inside the message are replaced with placeholders.

    v1
platform=java
service=checkout-api
type=java.lang.NullPointerException
frame=com.example.checkout.CartService#total
frame=com.example.checkout.CheckoutController#submit

  3. 3 · Hash it

    SHA-256 of the text above, truncated to 128 bits. The version is part of the group key: a future algorithm opens new groups rather than rewriting these.

    Fingerprint
    b2b9c15ea9557bba93353505c471e919
    Algorithm version
    v1

Similar groups

Trigram similarity computed by Postgres against a GIN index. It catches what a fingerprint cannot — the same fault one refactor away from an existing group. No model is involved.