feat: add configuration files for optional getters in Java clients

Author: jorgerod

.tool-versions

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+ivm-java openjdk-21.0.8

bin/configs/java-restclient-springBoot4-jackson3-jspecify-optional-getters.yaml

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+generatorName: java
+outputDir: samples/client/petstore/java/restclient-springBoot4-jackson3-jspecify-optional-getters
+library: restclient
+inputSpec: modules/openapi-generator/src/test/resources/3_0/java/jspecify.yaml
+templateDir: modules/openapi-generator/src/main/resources/Java
+validateSpec: false
+additionalProperties:
+  artifactId: petstore-restclient-optional-getters
+  hideGenerationTimestamp: "true"
+  containerDefaultToNull: "true"
+  useSpringBoot4: true
+  useJackson3: true
+  openApiNullable: false
+  useJspecify: true
+  optionalGettersForNullableFieldsOnly: "true"
+typeMappings:
+  OffsetDateTime: java.time.Instant
+  BigDecimal: java.math.BigDecimal

bin/configs/java-resttemplate-springBoot4-jackson3-jspecify-optional-getters.yaml

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+generatorName: java
+outputDir: samples/client/petstore/java/resttemplate-springBoot4-jackson3-jspecify-optional-getters
+library: resttemplate
+inputSpec: modules/openapi-generator/src/test/resources/3_0/java/jspecify.yaml
+templateDir: modules/openapi-generator/src/main/resources/Java
+validateSpec: false
+additionalProperties:
+  artifactId: petstore-resttemplate-optional-getters
+  hideGenerationTimestamp: "true"
+  containerDefaultToNull: "true"
+  useJakartaEe: true
+  useSpringBoot4: true
+  useJackson3: true
+  openApiNullable: false
+  useJspecify: true
+  optionalGettersForNullableFieldsOnly: "true"
+typeMappings:
+  OffsetDateTime: java.time.Instant
+  BigDecimal: java.math.BigDecimal

bin/configs/java-webclient-springBoot4-jackson3-jspecify-optional-getters.yaml

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+generatorName: java
+outputDir: samples/client/petstore/java/webclient-springBoot4-jackson3-jspecify-optional-getters
+library: webclient
+inputSpec: modules/openapi-generator/src/test/resources/3_0/java/jspecify.yaml
+templateDir: modules/openapi-generator/src/main/resources/Java
+validateSpec: false
+additionalProperties:
+  artifactId: petstore-webclient-optional-getters
+  hideGenerationTimestamp: "true"
+  containerDefaultToNull: "true"
+  useSpringBoot4: true
+  useJackson3: true
+  openApiNullable: false
+  useJspecify: true
+  optionalGettersForNullableFieldsOnly: "true"
+typeMappings:
+  OffsetDateTime: java.time.Instant
+  BigDecimal: java.math.BigDecimal

bin/configs/spring-boot-4-jspecify-optional-getters.yaml

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+generatorName: spring
+library: spring-boot
+outputDir: samples/openapi3/server/petstore/springboot-4-jspecify-optional-getters
+inputSpec: modules/openapi-generator/src/test/resources/3_0/java/jspecify.yaml
+templateDir: modules/openapi-generator/src/main/resources/JavaSpring
+validateSpec: false
+additionalProperties:
+  groupId: org.openapitools.openapi3
+  documentationProvider: springdoc
+  interfaceOnly: true
+  artifactId: springboot-optional-getters
+  snapshotVersion: "true"
+  useSpringBoot4: true
+  useJackson3: true
+  useBeanValidation: true
+  withXml: true
+  hideGenerationTimestamp: "true"
+  generateConstructorWithAllArgs: true
+  generateBuilders: true
+  openApiNullable: false
+  useJspecify: true
+  optionalGettersForNullableFieldsOnly: "true"