bug: #778 return empty page result instead of HTTP 404

CHANGELOG.md

@@ -8,6 +8,9 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 _**For better traceability add the corresponding GitHub issue number in each changelog entry, please.**_
 ## [UNRELEASED - DD.MM.YYYY]
 
+### Changed
+- #778 return empty PageResult when no contract agreement Ids are found instead of http 404 in /contacts API
+
 ## [11.0.0 - 08.05.2024]
 ### Added
 - #844 Validation for BPN to Notification API (Create / Edit), Fixed pagination

tx-backend/src/main/java/org/eclipse/tractusx/traceability/contracts/infrastructure/repository/ContractRepositoryImpl.java

@@ -70,7 +70,8 @@ public PageResult<Contract> getContractsByPageable(Pageable pageable, SearchCrit
             Page<ContractAgreementView> contractAgreementInfoViews = contractAgreementInfoViewRepository.findAll(specification, pageable);
 
             if (contractAgreementInfoViews.getContent().isEmpty()) {
-                throw new ContractException("Cannot find contract agreement Ids for asset ids in searchCriteria: " + searchCriteria.getSearchCriteriaFilterList());
+                log.warn("Cannot find contract agreement Ids for asset ids in searchCriteria: " + searchCriteria.getSearchCriteriaFilterList());
+                return new PageResult<>(List.of(), 0, 0, 0, 0L);
             }
 
             return new PageResult<>(fetchEdcContractAgreements(contractAgreementInfoViews),

tx-backend/src/test/java/org/eclipse/tractusx/traceability/integration/contracts/ContractControllerIT.java

@@ -142,14 +142,14 @@ void shouldReturnOnlyOneContract() throws JoseException {
     }
 
     @Test
-    void shouldReturn404IfAssetIdIsUnknown() throws JoseException {
+    void shouldReturnEmptyIfAssetIdIsUnknown() throws JoseException {
         //GIVEN
         edcSupport.edcWillReturnOnlyOneContractAgreement();
         edcSupport.edcWillReturnContractAgreementNegotiation();
         assetsSupport.defaultAssetsStored();
 
         //WHEN//THEN
-        given()
+        PageResult<ContractResponse> contractResponsePageResult = given()
                 .header(oAuth2Support.jwtAuthorization(ADMIN))
                 .contentType(ContentType.JSON)
                 .log().all()
@@ -158,7 +158,11 @@ void shouldReturn404IfAssetIdIsUnknown() throws JoseException {
                 .post("/api/contracts")
                 .then()
                 .log().all()
-                .statusCode(404);
+                .statusCode(200)
+                .extract().body().as(new TypeRef<>() {
+                });
+        //THEN
+        assertThat(contractResponsePageResult.content()).isEmpty();
     }
 
 }