java

Comparisons https://phauer.com/2018/moving-back-from-gradle-to-maven/ https://gradle.org/gradle-vs-maven-performance/ https://dzone.com/articles/gradle-vs-maven https://www.baeldung.com/ant-maven-gradle Further Gradle Info https://tomgregory.com/5-reasons-to-switch-to-the-gradle-kotlin-dsl/ https://www.oreilly.com/library/view/gradle-beyond-the/9781449373801/ch04.html Further Maven Info Essential Maven Plugins From https://javarevisited.blogspot.com/2016/08/top-10-maven-plugins-every-java-developer-know.html: maven-compiler-plugin: This is the most important maven plugin. You almost always use it unknowingly. This plugin compiles your Java code from the standard location Maven specifies e.g. /src/main/java and /src/main/resources. maven-surefire-plugin: The Maven Surefire plugin is the default plugin for running unit tests. You can also customize the behavior of this plugin by specifying the configuration in pom....

SourceCompatability vs. TargetCompatability https://stackoverflow.com/questions/16654951/gradle-sourcecompatibility-vs-targetcompatibility sourceCompatibility = JavaVersion.VERSION_11 Java Versions https://stackoverflow.com/questions/9170832/list-of-java-class-file-format-major-version-numbers gradle INVALID SOURCE RELEASE 17 https://stackoverflow.com/questions/70320448/spring-boot-gradle-build-invalid-source-release-11

Sources https://stackoverflow.com/questions/32884195/filter-values-only-if-not-null-using-lambda-in-java8

Sources https://stackoverflow.com/questions/51680343/ignore-fields-from-specific-request-in-spring-boot https://stackoverflow.com/questions/12505141/only-using-jsonignore-during-serialization-but-not-deserialization https://www.concretepage.com/jackson-api/jackson-jsonignore-jsonignoreproperties-and-jsonignoretype

Sources https://stackoverflow.com/questions/64868946/how-to-not-return-null-value-in-responseentity https://www.baeldung.com/jackson-ignore-null-fields https://stackoverflow.com/questions/11757487/how-to-tell-jackson-to-ignore-a-field-during-serialization-if-its-value-is-null Issue We have the following setting in the application.yml file, but it is ignored: spring: jackson: default-property-inclusion: non_null Manually annotating the classes with @JsonInclude(JsonInclude.Include.NON_NULL) did reinstate the wanted behaviour. However, this is painful for classes that are pulled from libraries. Root cause seems to be related to the following: https://stackoverflow.com/questions/62819472/spring-jackson-default-property-inclusion-ignored. ObjectMapper Bean in our config. Add the following: .serializationInclusion(JsonInclude.Include.NON_NULL).

Sources https://stackoverflow.com/questions/53340164/feignclient-converts-get-method-to-post https://stackoverflow.com/questions/53340164/feignclient-converts-get-method-to-post https://stackoverflow.com/questions/58468968/feign-client-get-request-throws-method-not-allowed-request-method-post-not Presence of requestbody automatically converts it to a POST

Sources https://stackoverflow.com/questions/69828371/how-to-handle-multiple-combination-of-java-bean-validation-in-spring https://www.baeldung.com/spring-mvc-custom-validator#custom-class-level-validation https://stackoverflow.com/questions/19089649/best-practices-for-validation-depending-on-actions-spring-mvc https://www.baeldung.com/javax-validation-groups https://reflectoring.io/bean-validation-with-spring-boot/#using-validation-groups-to-validate-objects-differently-for-different-use-cases

Sources https://stackoverflow.com/questions/26684361/filter-child-object-in-spring-data-query https://stackoverflow.com/questions/42857947/jpa-with-specification-how-to-filter-an-entity-by-a-child-collection-content https://stackoverflow.com/questions/47867124/spring-data-jpa-specification-how-to-filter-a-parent-object-by-its-children-obj https://www.baeldung.com/jpa-and-or-criteria-predicates?fbclid=IwAR0vao7fFrB_NghXBEesu-cCFN9HS4WfPcmCXvTkKIvO72sIWu2Nz2aST4A https://stackoverflow.com/questions/55629512/how-to-filter-parent-object-which-has-list-of-children-and-a-child-has-list-of-g https://tousu.in/qa/?qa=873798/ https://stackoverflow.com/questions/25627484/how-to-filter-child-entities-collections-with-predicate?noredirect=1&lq=1 Fetch Joins https://stackoverflow.com/questions/71840199/how-to-fix-jpa-specification-api-with-join-on-condition-returns-2-query-instead More detail - Multiselect https://www.initgrep.com/posts/java/jpa/select-values-in-criteria-queries Subquery https://stackoverflow.com/questions/53678146/jpa-2-1-predicate-criteria-for-child-entity\ Matching against a list https://stackoverflow.com/questions/13940249/jpa-criteria-api-matching-against-a-list-in-spring-data-jpa-specifications Further Info https://stackoverflow.com/questions/47469861/what-is-the-difference-between-a-criteria-a-predicate-and-a-specification

Sources https://stackoverflow.com/questions/62561211/spring-responsestatusexception-does-not-return-reason https://www.baeldung.com/global-error-handler-in-a-spring-rest-api https://www.amitph.com/spring-rest-api-custom-error-messages/ https://auth0.com/blog/get-started-with-custom-error-handling-in-spring-boot-java/ https://stackoverflow.com/questions/45317638/how-to-catch-accessdeniedexception-in-spring-boot-rest-api https://stackoverflow.com/questions/59302621/custom-message-in-spring-accessdeniedexception https://dzone.com/articles/best-practice-for-exception-handling-in-spring-boo @ControllerAdvice annotation Note AccessDeniedException needs to be taken care of in filter chain

Use: --spring.config.name=myproject, where myproject is the name of the *.yml or *.properties file that is stored under the default /config directory. The extension is not required. https://docs.spring.io/spring-boot/docs/2.1.13.RELEASE/reference/html/boot-features-external-config.html Further Documentation https://www.baeldung.com/spring-yaml https://baeldung-cn.com/spring-yaml-vs-properties https://docs.spring.io/spring-boot/docs/1.0.1.RELEASE/reference/html/howto-properties-and-configuration.html https://docs.spring.io/spring-boot/docs/1.0.1.RELEASE/reference/html/howto-properties-and-configuration.html#howto-change-configuration-depending-on-the-environment need: spring.config.activate.on-profile: “profile_name” example: spring: # default config without profile name . . . --- spring: config: activate: on-profile: "profile name" In conjunction with: ./gradlew run --args='--spring.profiles.active=profile_name' Can make this even more complicated when activating multiple profiles at once with overlapping properties, in that case the precedence order of profiles needs to be defined....