diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/configuration/OpenApiConfiguration.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/configuration/OpenApiConfiguration.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/configuration/OpenApiConfiguration.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/configuration/OpenApiConfiguration.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/configuration/StatusProbeConfiguration.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/configuration/StatusProbeConfiguration.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/configuration/StatusProbeConfiguration.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/configuration/StatusProbeConfiguration.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/configuration/WebConfiguration.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/configuration/WebConfiguration.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/configuration/WebConfiguration.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/configuration/WebConfiguration.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/configuration/WebSecurityConfiguration.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/configuration/WebSecurityConfiguration.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/configuration/WebSecurityConfiguration.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/configuration/WebSecurityConfiguration.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/controller/v1/CalculationController.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/controller/v1/CalculationController.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/controller/v1/CalculationController.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/controller/v1/CalculationController.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/controller/v1/ElectionController.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/controller/v1/ElectionController.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/controller/v1/ElectionController.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/controller/v1/ElectionController.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/controller/v1/ElectionResultController.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/controller/v1/ElectionResultController.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/controller/v1/ElectionResultController.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/controller/v1/ElectionResultController.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/controller/v1/PartyController.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/controller/v1/PartyController.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/controller/v1/PartyController.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/controller/v1/PartyController.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/model/db/Candidate.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/model/db/Candidate.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/model/db/Candidate.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/model/db/Candidate.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/model/db/Constituency.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/model/db/Constituency.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/model/db/Constituency.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/model/db/Constituency.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/model/db/Election.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/model/db/Election.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/model/db/Election.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/model/db/Election.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/model/db/ElectionResult.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/model/db/ElectionResult.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/model/db/ElectionResult.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/model/db/ElectionResult.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/model/db/PartyInElection.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/model/db/PartyInElection.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/model/db/PartyInElection.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/model/db/PartyInElection.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/model/db/VotingResult.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/model/db/VotingResult.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/model/db/VotingResult.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/model/db/VotingResult.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/model/internal/Candidate.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/Candidate.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/model/internal/Candidate.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/Candidate.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/model/internal/Constituency.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/Constituency.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/model/internal/Constituency.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/Constituency.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/model/internal/ConstituencyId.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/ConstituencyId.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/model/internal/ConstituencyId.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/ConstituencyId.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/model/internal/Elected.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/Elected.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/model/internal/Elected.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/Elected.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/model/internal/ElectedCandidate.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/ElectedCandidate.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/model/internal/ElectedCandidate.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/ElectedCandidate.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/model/internal/ElectionResult.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/ElectionResult.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/model/internal/ElectionResult.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/ElectionResult.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/model/internal/PartyId.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/PartyId.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/model/internal/PartyId.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/model/internal/PartyId.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/monitoring/actuator/AbstractHealthIndicator.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/actuator/AbstractHealthIndicator.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/monitoring/actuator/AbstractHealthIndicator.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/actuator/AbstractHealthIndicator.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/monitoring/actuator/AbstractStatusProbeHealthIndicator.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/actuator/AbstractStatusProbeHealthIndicator.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/monitoring/actuator/AbstractStatusProbeHealthIndicator.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/actuator/AbstractStatusProbeHealthIndicator.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/monitoring/actuator/Preparable.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/actuator/Preparable.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/monitoring/actuator/Preparable.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/actuator/Preparable.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/monitoring/actuator/RestHealthIndicator.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/actuator/RestHealthIndicator.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/monitoring/actuator/RestHealthIndicator.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/actuator/RestHealthIndicator.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/CountBasedStatusProbe.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/CountBasedStatusProbe.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/CountBasedStatusProbe.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/CountBasedStatusProbe.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/PercentageBasedStatusProbe.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/PercentageBasedStatusProbe.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/PercentageBasedStatusProbe.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/PercentageBasedStatusProbe.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/ScheduledStatusProbe.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/ScheduledStatusProbe.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/ScheduledStatusProbe.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/ScheduledStatusProbe.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/StatusProbe.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/StatusProbe.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/StatusProbe.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/StatusProbe.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/StatusProbeCriticality.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/StatusProbeCriticality.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/StatusProbeCriticality.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/StatusProbeCriticality.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/StatusProbeLogger.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/StatusProbeLogger.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/StatusProbeLogger.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/StatusProbeLogger.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/TimeBasedStatusProbe.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/TimeBasedStatusProbe.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/monitoring/statusprobe/TimeBasedStatusProbe.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/monitoring/statusprobe/TimeBasedStatusProbe.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/repository/CandidateRepository.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/repository/CandidateRepository.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/repository/CandidateRepository.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/repository/CandidateRepository.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/repository/ConstituencyRepository.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/repository/ConstituencyRepository.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/repository/ConstituencyRepository.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/repository/ConstituencyRepository.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/repository/ElectionRepository.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/repository/ElectionRepository.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/repository/ElectionRepository.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/repository/ElectionRepository.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/repository/ElectionResultRepository.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/repository/ElectionResultRepository.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/repository/ElectionResultRepository.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/repository/ElectionResultRepository.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/repository/NominationRepository.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/repository/NominationRepository.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/repository/NominationRepository.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/repository/NominationRepository.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/repository/PartyRepository.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/repository/PartyRepository.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/repository/PartyRepository.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/repository/PartyRepository.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/service/CandidateService.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/service/CandidateService.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/service/CandidateService.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/service/CandidateService.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/service/ConstituencyService.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/service/ConstituencyService.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/service/ConstituencyService.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/service/ConstituencyService.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/service/ElectionResultService.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/service/ElectionResultService.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/service/ElectionResultService.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/service/ElectionResultService.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/service/ElectionService.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/service/ElectionService.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/service/ElectionService.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/service/ElectionService.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/service/PartyService.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/service/PartyService.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/service/PartyService.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/service/PartyService.kt
diff --git a/module-server/src/main/java/de/twomartens/wahlrecht/service/PropertyReloadService.java b/module-server/src/main/kotlin/de/twomartens/wahlrecht/service/PropertyReloadService.kt
similarity index 100%
rename from module-server/src/main/java/de/twomartens/wahlrecht/service/PropertyReloadService.java
rename to module-server/src/main/kotlin/de/twomartens/wahlrecht/service/PropertyReloadService.kt