* bump spring-boot-starter-parent from 3.5.14 to 4.1.0 (latest)

* Upgrade to Jackson 3 (#934)

* upgrade fairdatateam packages:
  - bump spring-security-acl-mongodb version from 6.0.4 to 6.0.5
  - bump rdf-resource-resolver version from 0.2.0 to 0.2.2
  - bump spring-rdf-migration version from 2.0.0 to 2.0.1

* replace spring.data.mongodb by spring.mongodb in application.yml

  see https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-4.0-Configuration-Changelog

* rename spring-boot-starter-aop to spring-boot-starter-aspectj

  see https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-4.0-Migration-Guide#aop-starter-pom

* replace deprecated spring-boot-starter-web by spring-boot-starter-webmvc and replace spring-boot-starter-test by spring-boot-starter-webmvc-test (which brings in spring-boot-starter-test as transitive dependency)

  https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-4.0-Migration-Guide#deprecated-starters
  https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-4.0-Migration-Guide#test-code

* remove android-json exclusion from spring-boot-starter-test, as it does not appear to do anything

* replace spring-security-test by spring-boot-starter-security-test, as mentioned in https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-4.0-Migration-Guide#test-code

* remove redundant spring-data-mongodb dependency, because this is already pulled in by spring-boot-starter-data-mongodb (via spring-boot-starter-mongodb)

  https://central.sonatype.com/artifact/org.springframework.boot/spring-boot-starter-data-mongodb/4.0.6
  https://central.sonatype.com/artifact/org.springframework.boot/spring-boot-data-mongodb/4.0.6

* replace deprecated PersistenceConstructor by PersistenceCreator (cannot find this in spring-data-commons release notes, but see e.g. spring-projects/spring-data-neo4j@1c11be9)

* add spring-boot-starter-restclient and corresponding test starter, fix corresponding RestTemplateBuilder import, and replace deprecated setConnectionTimeout and setReadTimeout calls

  https://docs.spring.io/spring-boot/3.4/api/java/org/springframework/boot/web/client/RestTemplateBuilder.html

* fix imports for AutoConfigureMockMvc and AutoConfigureMockRestServiceServer, because these have been moved from org.springframework.boot.test.autoconfigure.web to two different packages

* add spring-boot-starter-micrometer-metrics dependency and fix corresponding metrics imports (see spring-projects/spring-boot#50788)

* revert spring-boot-starter-micrometer-metrics dependency because spring-boot-starter-actuator already pulls that in (see https://github.com/spring-projects/spring-boot/blob/2edca39504f8e9c2943262d3e60ba34b0e7751ac/starter/spring-boot-starter-actuator/build.gradle#L25)

* remove unused setFromHttpEntity method, because, not only is it unused, but it gives rise to the following error in spring-boot 4: "incompatible types: org.springframework.http.HttpHeaders cannot be converted to java.util.Map<java.lang.String,java.util.List<java.lang.String>>"

* fix TestRestTemplate imports (class has been moved to org.springframework.boot.resttestclient package in spring-boot 4)

* replace ClientHttpRequestFactorySettings.Redirects by HttpRedirects because org.springframework.boot.http.client.ClientHttpRequestFactorySettings has been removed, apparently

* fix HttpHeaders assertions because the class no longer extends MultiValueMap

* rearrange httpclient5 dependency (this was listed under 'Test' dependencies, but does not specify the test scope)

* explicit dependency on jakarta.servlet-api

  This is available via spring-boot starters (jetty?), but we depend heavily on this package and import explicitly from it, so better make the dependency explicit. The package version is managed by spring boot.
https://docs.spring.io/spring-boot/appendix/dependency-versions/coordinates.html

* bump springdoc-openapi-starter-webmvc-ui from 2.8.16 to 3.0.3, for compatibility with spring-boot 4 (spring 7)

* add @AutoConfigureTestRestTemplate to WebIntegrationTest because @SpringBootTest no longer provides the TestRestTemplate bean, as mentioned in the migration guide:
  https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-4.0-Migration-Guide#using-webclient-or-testresttemplate-and-springboottest

* make setup() public in HarvesterServiceTest

* clean up spring-boot-starters, following the spring-boot-starter-classic workflow described in the spring boot 4 migration guide

* explicit jackson dependency: we import directly from the jackson packages in many places, so the dependency should be explicit instead of only transitive

* explicit dependency on spring-boot-data-mongodb

* use jspecify @nullable in AbstractMetadataRepository (this is the only use of @nullable in the fdp)

* handle null in ResourceDefinitionTargetClassesCache to get rid of the nullpointerexceptions in tests, like:

  "Cannot invoke org.fairdatateam.fairdatapoint.entity.schema.MetadataSchema.getTargetClasses()
    because the return value of java.util.Map.get(Object) is null at org.fairdatateam.fairdatapoint.service.resource.ResourceDefinitionTargetClassesCache.lambda$computeCache$2(ResourceDefinitionTargetClassesCache.java:84)"

* fix style for ResourceDefinitionTargetClassesCache

* configure mongodb uuid representation 

  an alternative would be something like:

  ```java
  @configuration
  public class MongoClientConfig extends AbstractMongoClientConfiguration {

      @value("${spring.mongodb.database}")
      private String databaseName;

      @OverRide
      protected void configureClientSettings(MongoClientSettings.Builder builder) {
          builder.uuidRepresentation(UuidRepresentation.STANDARD);
      }

      @OverRide
      protected @nonnull String getDatabaseName() {
          return databaseName;
      }
  }
  ```

  https://docs.spring.io/spring-data/mongodb/reference/migration-guide/migration-guide-4.x-to-5.x.html

* explicit no-args constructor for MetadataSchemaDraftDTO marked as @JsonCreator (fixes the "Cannot map `null` into type `boolean`" error)

  also see FasterXML/jackson-databind#5318 and https://github.com/FasterXML/jackson/wiki/Jackson-Release-3.0#jackson-databind

* change MetadataSchemaDraftDTO.abstractSchema boolean to Boolean

  this fixes the following error: "Cannot map null into type boolean (set DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES to 'false' to allow)"

* replace ObjectMapper by JsonMapper with new builder api

    - fix corresponding imports: com.fasterxml.jackson moved to tools.jackson except for com.fasterxml.jackson.annotation
    - replace JsonProcessingException by JacksonException
    - replace MappingJackson2HttpMessageConverter by JacksonJsonHttpMessageConverter

* switch WebMvcConfig to constructor autowiring, while we're at it

* update configureMessageConverters to use ServerBuilder because the original method is deprecated for removal

* annotate ContentNegotiationConfigurer NonNull to match parent signature

* explicit dependency on slf4j, because it is used explicitly throughout the code, but was only included transitively (implicitly)