added custom date converter in order to fix issue.

Author: HugoMario

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/SpringCodegen.java

@@ -39,6 +39,8 @@ public class SpringCodegen extends AbstractJavaCodegen
     public static final String SWAGGER_DOCKET_CONFIG = "swaggerDocketConfig";
     public static final String TARGET_OPENFEIGN = "generateForOpenFeign";
     public static final String DEFAULT_INTERFACES = "defaultInterfaces";
+    public static final String DATE_PATTERN = "datePattern";
+    public static final String DATE_TIME_PATTERN = "dateTimePattern";
 
     protected String title = "swagger-petstore";
     protected String configPackage = "io.swagger.configuration";
@@ -94,6 +96,8 @@ public SpringCodegen() {
                 "Use Optional container for optional parameters"));
         cliOptions.add(CliOption.newBoolean(TARGET_OPENFEIGN,"Generate for usage with OpenFeign (instead of feign)"));
         cliOptions.add(CliOption.newBoolean(DEFAULT_INTERFACES, "Generate default implementations for interfaces").defaultValue("true"));
+        cliOptions.add(CliOption.newBoolean(DATE_PATTERN, "use pattern for date parameters").defaultValue("true"));
+        cliOptions.add(CliOption.newBoolean(DATE_TIME_PATTERN, "use pattern for date time parameters").defaultValue("true"));
 
         supportedLibraries.put(DEFAULT_LIBRARY, "Spring-boot Server application using the SpringFox integration.");
         supportedLibraries.put(SPRING_MVC_LIBRARY, "Spring-MVC Server application using the SpringFox integration.");
@@ -293,6 +297,10 @@ public void processOpts() {
                         (sourceFolder + File.separator + apiPackage).replace(".", java.io.File.separator), "ApiOriginFilter.java"));
                 supportingFiles.add(new SupportingFile("swaggerDocumentationConfig.mustache",
                         (sourceFolder + File.separator + configPackage).replace(".", java.io.File.separator), "SwaggerDocumentationConfig.java"));
+                supportingFiles.add(new SupportingFile("LocalDateConverter.mustache",
+                        (sourceFolder + File.separator + configPackage).replace(".", java.io.File.separator), "LocalDateConverter.java"));
+                supportingFiles.add(new SupportingFile("LocalDateTimeConverter.mustache",
+                        (sourceFolder + File.separator + configPackage).replace(".", java.io.File.separator), "LocalDateTimeConverter.java"));
             }
         } else if ( this.swaggerDocketConfig && !library.equals(SPRING_CLOUD_LIBRARY)) {
             supportingFiles.add(new SupportingFile("swaggerDocumentationConfig.mustache",

modules/swagger-codegen/src/main/resources/JavaSpring/LocalDateConverter.mustache

@@ -0,0 +1,21 @@
+package io.swagger.configuration;
+
+import org.springframework.core.convert.converter.Converter;
+import org.threeten.bp.LocalDate;
+import org.threeten.bp.format.DateTimeFormatter;
+
+public class LocalDateConverter implements Converter<String, LocalDate> {
+    private final DateTimeFormatter formatter;
+
+    public LocalDateConverter(String dateFormat) {
+        this.formatter = DateTimeFormatter.ofPattern(dateFormat);
+    }
+
+    @Override
+    public LocalDate convert(String source) {
+        if(source == null || source.isEmpty()) {
+            return null;
+        }
+        return LocalDate.parse(source, this.formatter);
+    }
+}

modules/swagger-codegen/src/main/resources/JavaSpring/LocalDateTimeConverter.mustache

@@ -0,0 +1,21 @@
+package io.swagger.configuration;
+
+import org.springframework.core.convert.converter.Converter;
+import org.threeten.bp.LocalDateTime;
+import org.threeten.bp.format.DateTimeFormatter;
+
+public class LocalDateTimeConverter implements Converter<String, LocalDateTime> {
+    private final DateTimeFormatter formatter;
+
+    public LocalDateTimeConverter(String dateFormat) {
+        this.formatter = DateTimeFormatter.ofPattern(dateFormat);
+    }
+
+    @Override
+    public LocalDateTime convert(String source) {
+        if(source == null || source.isEmpty()) {
+            return null;
+        }
+        return LocalDateTime.parse(source, this.formatter);
+    }
+}

modules/swagger-codegen/src/main/resources/JavaSpring/libraries/spring-boot/swagger2SpringBoot.mustache

@@ -1,11 +1,16 @@
 package {{basePackage}};
 
+import {{configPackage}}.LocalDateConverter;
+import {{configPackage}}.LocalDateTimeConverter;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.ExitCodeGenerator;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.ComponentScan;
 
+import org.springframework.context.annotation.Configuration;
+import org.springframework.format.FormatterRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
 import springfox.documentation.swagger2.annotations.EnableSwagger2;
 
 @SpringBootApplication
@@ -24,6 +29,15 @@ public class Swagger2SpringBoot implements CommandLineRunner {
         new SpringApplication(Swagger2SpringBoot.class).run(args);
     }
 
+    @Configuration
+    static class MyConfig extends WebMvcConfigurerAdapter {
+        @Override
+        public void addFormatters(FormatterRegistry registry) {
+            registry.addConverter(new LocalDateConverter("{{#datePattern}}{{datePattern}}{{/datePattern}}{{^datePattern}}yyyy-MM-dd{{/datePattern}}"));
+            registry.addConverter(new LocalDateTimeConverter("{{#dateTimePattern}}{{dateTimePattern}}{{/dateTimePattern}}{{^dateTimePattern}}yyyy-MM-dd'T'HH:mm:ss.SSS{{/dateTimePattern}}"));
+        }
+    }
+
     class ExitException extends RuntimeException implements ExitCodeGenerator {
         private static final long serialVersionUID = 1L;