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Fix NPE in isIdempotencyReplayed caused by null status-line header key - #124
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Oct 21, 2026
WalkthroughThe release updates request options to normalize idempotency-key header names and response handling to exclude null header keys. Response header lookups use case-insensitive comparisons. The project version is updated to 4.17.2. ChangesIdempotency and response-header handling
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to
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| Check name | Status | Explanation |
|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 87.72% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 57 functions across 50 files. (49 skipped: … |
Full details: Docstring Coverage
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Explanation
Docstring coverage is 87.72% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 57 functions across 50 files. (49 skipped: 2 unsupported, 47 over the file limit.)
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Inline comments:
Review comments at
@src/main/java/com/chargebee/v4/client/request/RequestOptions.java:
- Around line 89-96: Update RequestContext.merge() to merge headers
case-insensitively: before inserting each header from the other context, remove
any existing key equal to it ignoring case, then insert the operation header so
it overrides the client value deterministically. Preserve the existing behavior
for null other contexts and unrelated headers.
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📒 Files selected for processing: 99
CHANGELOG.mdVERSIONbuild.gradle.ktssrc/main/java/com/chargebee/v4/client/request/RequestOptions.javasrc/main/java/com/chargebee/v4/models/BaseResponse.javasrc/main/java/com/chargebee/v4/models/addon/responses/AddonListResponse.javasrc/main/java/com/chargebee/v4/models/alert/responses/AlertListResponse.javasrc/main/java/com/chargebee/v4/models/alert/responses/ApplicationAlertsForSubscriptionResponse.javasrc/main/java/com/chargebee/v4/models/alertStatus/responses/AlertStatusesForAlertResponse.javasrc/main/java/com/chargebee/v4/models/alertStatus/responses/AlertStatusesForSubscriptionResponse.javasrc/main/java/com/chargebee/v4/models/attachedItem/responses/AttachedItemListResponse.javasrc/main/java/com/chargebee/v4/models/businessEntity/responses/BusinessEntityGetTransfersResponse.javasrc/main/java/com/chargebee/v4/models/businessRule/responses/BusinessRuleListResponse.javasrc/main/java/com/chargebee/v4/models/businessRuleset/responses/BusinessRulesetListResponse.javasrc/main/java/com/chargebee/v4/models/comment/responses/CommentListResponse.javasrc/main/java/com/chargebee/v4/models/coupon/responses/CouponListResponse.javasrc/main/java/com/chargebee/v4/models/couponCode/responses/CouponCodeListResponse.javasrc/main/java/com/chargebee/v4/models/couponSet/responses/CouponSetListResponse.javasrc/main/java/com/chargebee/v4/models/creditNote/responses/CreditNoteListResponse.javasrc/main/java/com/chargebee/v4/models/creditNote/responses/CreditNotesForCustomerResponse.javasrc/main/java/com/chargebee/v4/models/creditUnit/responses/CreditUnitListResponse.javasrc/main/java/com/chargebee/v4/models/currency/responses/CurrencyListResponse.javasrc/main/java/com/chargebee/v4/models/customer/responses/ContactsForCustomerResponse.javasrc/main/java/com/chargebee/v4/models/customer/responses/CustomerListHierarchyDetailResponse.javasrc/main/java/com/chargebee/v4/models/customer/responses/CustomerListResponse.javasrc/main/java/com/chargebee/v4/models/customerEntitlement/responses/CustomerEntitlementEntitlementsForCustomerResponse.javasrc/main/java/com/chargebee/v4/models/differentialPrice/responses/DifferentialPriceListResponse.javasrc/main/java/com/chargebee/v4/models/dispute/responses/DisputeListResponse.javasrc/main/java/com/chargebee/v4/models/einvoice/responses/ListEinvoicesResponse.javasrc/main/java/com/chargebee/v4/models/emailLog/responses/EmailLogsForCustomerResponse.javasrc/main/java/com/chargebee/v4/models/entitlement/responses/EntitlementListResponse.javasrc/main/java/com/chargebee/v4/models/entitlementOverride/responses/ListEntitlementOverrideForSubscriptionResponse.javasrc/main/java/com/chargebee/v4/models/event/responses/EventListResponse.javasrc/main/java/com/chargebee/v4/models/feature/responses/FeatureListResponse.javasrc/main/java/com/chargebee/v4/models/gift/responses/GiftListResponse.javasrc/main/java/com/chargebee/v4/models/grantBlock/responses/ListGrantBlocksResponse.javasrc/main/java/com/chargebee/v4/models/hostedPage/responses/HostedPageListResponse.javasrc/main/java/com/chargebee/v4/models/invoice/responses/InvoiceListPaymentReferenceNumbersResponse.javasrc/main/java/com/chargebee/v4/models/invoice/responses/InvoiceListResponse.javasrc/main/java/com/chargebee/v4/models/invoice/responses/InvoicesForCustomerResponse.javasrc/main/java/com/chargebee/v4/models/invoice/responses/InvoicesForSubscriptionResponse.javasrc/main/java/com/chargebee/v4/models/item/responses/ItemListResponse.javasrc/main/java/com/chargebee/v4/models/itemEntitlement/responses/ItemEntitlementsForFeatureResponse.javasrc/main/java/com/chargebee/v4/models/itemEntitlement/responses/ItemEntitlementsForItemResponse.javasrc/main/java/com/chargebee/v4/models/itemFamily/responses/ItemFamilyListResponse.javasrc/main/java/com/chargebee/v4/models/itemPrice/responses/FindApplicableItemPricesResponse.javasrc/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceFindApplicableItemsResponse.javasrc/main/java/com/chargebee/v4/models/itemPrice/responses/ItemPriceListResponse.javasrc/main/java/com/chargebee/v4/models/ledgerAccountBalance/responses/ListLedgerAccountBalancesResponse.javasrc/main/java/com/chargebee/v4/models/ledgerOperation/responses/ListLedgerOperationsResponse.javasrc/main/java/com/chargebee/v4/models/meter/responses/MeterListResponse.javasrc/main/java/com/chargebee/v4/models/omnichannelOneTimeOrder/responses/OmnichannelOneTimeOrderListResponse.javasrc/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelSubscriptionListResponse.javasrc/main/java/com/chargebee/v4/models/omnichannelSubscription/responses/OmnichannelTransactionsForOmnichannelSubscriptionResponse.javasrc/main/java/com/chargebee/v4/models/omnichannelSubscriptionItem/responses/OmnichannelSubscriptionItemListOmniSubscriptionItemScheduleChangesResponse.javasrc/main/java/com/chargebee/v4/models/order/responses/OrderListResponse.javasrc/main/java/com/chargebee/v4/models/order/responses/OrdersForInvoiceResponse.javasrc/main/java/com/chargebee/v4/models/paymentSchedule/responses/PaymentScheduleListResponse.javasrc/main/java/com/chargebee/v4/models/paymentScheduleScheme/responses/PaymentScheduleSchemeListResponse.javasrc/main/java/com/chargebee/v4/models/paymentSource/responses/ListGatewayTokensForPaymentSourceResponse.javasrc/main/java/com/chargebee/v4/models/paymentSource/responses/PaymentSourceListResponse.javasrc/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVouchersForCustomerResponse.javasrc/main/java/com/chargebee/v4/models/paymentVoucher/responses/PaymentVouchersForInvoiceResponse.javasrc/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemListApplicableAddonsResponse.javasrc/main/java/com/chargebee/v4/models/pc2MigrationItem/responses/Pc2MigrationItemListResponse.javasrc/main/java/com/chargebee/v4/models/pc2MigrationItemFamily/responses/Pc2MigrationItemFamilyListResponse.javasrc/main/java/com/chargebee/v4/models/pc2MigrationItemPrice/responses/Pc2MigrationItemPriceListResponse.javasrc/main/java/com/chargebee/v4/models/plan/responses/PlanListResponse.javasrc/main/java/com/chargebee/v4/models/priceVariant/responses/PriceVariantListResponse.javasrc/main/java/com/chargebee/v4/models/product/responses/ProductListResponse.javasrc/main/java/com/chargebee/v4/models/promotionalCredit/responses/PromotionalCreditListResponse.javasrc/main/java/com/chargebee/v4/models/quote/responses/QuoteLineGroupsForQuoteResponse.javasrc/main/java/com/chargebee/v4/models/quote/responses/QuoteListResponse.javasrc/main/java/com/chargebee/v4/models/quoteEntitlement/responses/ListQuoteEntitlementsResponse.javasrc/main/java/com/chargebee/v4/models/ramp/responses/RampListResponse.javasrc/main/java/com/chargebee/v4/models/siteMigrationDetail/responses/SiteMigrationDetailListResponse.javasrc/main/java/com/chargebee/v4/models/subscription/responses/ContractTermsForSubscriptionResponse.javasrc/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionListDiscountsResponse.javasrc/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionListResponse.javasrc/main/java/com/chargebee/v4/models/subscription/responses/SubscriptionsForCustomerResponse.javasrc/main/java/com/chargebee/v4/models/subscriptionEntitlement/responses/SubscriptionEntitlementsForSubscriptionResponse.javasrc/main/java/com/chargebee/v4/models/thirdPartyEntityMapping/responses/ThirdPartyEntityMappingListResponse.javasrc/main/java/com/chargebee/v4/models/tpSiteUser/responses/GuestsForTpSiteUserResponse.javasrc/main/java/com/chargebee/v4/models/tpSiteUser/responses/UsersForTpSiteUserResponse.javasrc/main/java/com/chargebee/v4/models/transaction/responses/TransactionListResponse.javasrc/main/java/com/chargebee/v4/models/transaction/responses/TransactionPaymentsForInvoiceResponse.javasrc/main/java/com/chargebee/v4/models/transaction/responses/TransactionsForCustomerResponse.javasrc/main/java/com/chargebee/v4/models/transaction/responses/TransactionsForSubscriptionResponse.javasrc/main/java/com/chargebee/v4/models/unbilledCharge/responses/UnbilledChargeListResponse.javasrc/main/java/com/chargebee/v4/models/usage/responses/UsageListResponse.javasrc/main/java/com/chargebee/v4/models/usageCharge/responses/RetrieveUsageChargesForSubscriptionResponse.javasrc/main/java/com/chargebee/v4/models/usageSummary/responses/RetrieveUsageSummaryForSubscriptionResponse.javasrc/main/java/com/chargebee/v4/models/variant/responses/ListProductVariantsResponse.javasrc/main/java/com/chargebee/v4/models/virtualBankAccount/responses/VirtualBankAccountListResponse.javasrc/main/java/com/chargebee/v4/models/webhookEndpoint/responses/WebhookEndpointListResponse.javasrc/main/java/com/chargebee/v4/transport/Response.javasrc/test/java/com/chargebee/v4/client/request/RequestOptionsTest.javasrc/test/java/com/chargebee/v4/models/BaseResponseTest.javasrc/test/java/com/chargebee/v4/transport/DefaultTransportTest.java
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Description
isIdempotencyReplayed()andheader()threw aNullPointerExceptionbecauseHttpURLConnectionreturns the HTTP status line as a header with anullname.Response headers are now read null-safely, and the
chargebee-idempotency-keyheader is matched regardless of letter case.Fixes
NullPointerExceptionfrom null HTTP status-line header keys. Removes null keys from exposed response headers and updates generated header lookups. Normalizes idempotency-key headers case-insensitively. Adds regression and real-HTTP tests. Updates the generator template, changelog, and version to 4.17.2.