fix: minor fixes

Author: Rajat069

qodana.yaml

@@ -0,0 +1,48 @@
+#-------------------------------------------------------------------------------#
+#               Qodana analysis is configured by qodana.yaml file               #
+#             https://www.jetbrains.com/help/qodana/qodana-yaml.html            #
+#-------------------------------------------------------------------------------#
+
+#################################################################################
+#              WARNING: Do not store sensitive information in this file,        #
+#               as its contents will be included in the Qodana report.          #
+#################################################################################
+version: "1.0"
+
+#Specify inspection profile for code analysis
+profile:
+  name: qodana.starter
+
+#Enable inspections
+#include:
+#  - name: <SomeEnabledInspectionId>
+
+#Disable inspections
+#exclude:
+#  - name: <SomeDisabledInspectionId>
+#    paths:
+#      - <path/where/not/run/inspection>
+
+projectJDK: "17" #(Applied in CI/CD pipeline)
+
+#Execute shell command before Qodana execution (Applied in CI/CD pipeline)
+#bootstrap: sh ./prepare-qodana.sh
+
+#Install IDE plugins before Qodana execution (Applied in CI/CD pipeline)
+#plugins:
+#  - id: <plugin.id> #(plugin id can be found at https://plugins.jetbrains.com)
+
+# Quality gate. Will fail the CI/CD pipeline if any condition is not met
+# severityThresholds - configures maximum thresholds for different problem severities
+# testCoverageThresholds - configures minimum code coverage on a whole project and newly added code
+# Code Coverage is available in Ultimate and Ultimate Plus plans
+#failureConditions:
+#  severityThresholds:
+#    any: 15
+#    critical: 5
+#  testCoverageThresholds:
+#    fresh: 70
+#    total: 50
+
+#Specify Qodana linter for analysis (Applied in CI/CD pipeline)
+linter: jetbrains/qodana-jvm-community:2025.2

src/main/java/com/rajat_singh/leetcode_api/service/LeetCodeService.java

@@ -136,7 +136,7 @@ public Optional<UserCalendarDTO> getUserLeetCodeCalendar(String username,int yea
             UserLeetCodeCalendarResponse.UserCalendar rawCalendar = response.getData()
                     .getMatchedUser()
                     .getUserCalendar();
-            Map<String, Integer> submissionMap = null;
+            Map<String, Integer> submissionMap;
             String calendarJsonString = rawCalendar.getSubmissionCalendar();
 
             try {

src/main/java/com/rajat_singh/leetcode_api/service/QuestionSpecificationService.java

@@ -56,7 +56,7 @@ public Specification<QuestionEntity> build(QuestionSearchRequest.FilterCriteria
             return spec;
         }
 
-        Specification<QuestionEntity> combinedFilters = null;
+        Specification<QuestionEntity> combinedFilters;
         if ("ALL".equalsIgnoreCase(filters.getFilterCombineType())) {
             combinedFilters = allSpecs.get(0);
             for (int i = 1; i < allSpecs.size(); i++) {
@@ -109,6 +109,7 @@ private Specification<QuestionEntity> withFrontendId(QuestionSearchRequest.Range
     private Specification<QuestionEntity> withTopics(QuestionSearchRequest.TopicFilter filter) {
         return (root, query, builder) -> {
 
+            assert query != null;
             query.distinct(true);
 
             if (filter.getOperator() == FilterOperator.IS_NOT) {