[cli][gradle] Validate now uses parseOptions w/setResolve (#5471)

* [cli] Validate now uses parseOptions w/setResolve

The validate command now uses ParseOptions#setResolve(true) to match how
we parse in CodegenConfigurator and online's Generate. Without this
option, the OpenAPI 3 parser skips the "resolve" block, which made lead
to validations in the command not matching validations during
generation.

* [gradle] Validate now uses parseOptions w/setResolve

The Graldle validate command now uses ParseOptions#setResolve(true) to match how
we parse in CodegenConfigurator and online's Generate. Without this
option, the OpenAPI 3 parser skips the "resolve" block, which made lead
to validations in the command not matching validations during
generation.

Author: jimschubert

modules/openapi-generator-cli/src/main/java/org/openapitools/codegen/cmd/Validate.java

@@ -22,6 +22,7 @@
 
 import io.swagger.parser.OpenAPIParser;
 import io.swagger.v3.oas.models.OpenAPI;
+import io.swagger.v3.parser.core.models.ParseOptions;
 import io.swagger.v3.parser.core.models.SwaggerParseResult;
 import org.apache.commons.lang3.text.WordUtils;
 import org.openapitools.codegen.validation.ValidationResult;
@@ -45,8 +46,9 @@ public class Validate implements Runnable {
     @Override
     public void run() {
         System.out.println("Validating spec (" + spec + ")");
-
-        SwaggerParseResult result = new OpenAPIParser().readLocation(spec, null, null);
+        ParseOptions options = new ParseOptions();
+        options.setResolve(true);
+        SwaggerParseResult result = new OpenAPIParser().readLocation(spec, null, options);
         List<String> messageList = result.getMessages();
         Set<String> errors = new HashSet<>(messageList);
         Set<String> warnings = new HashSet<>();

modules/openapi-generator-gradle-plugin/src/main/kotlin/org/openapitools/generator/gradle/plugin/tasks/ValidateTask.kt

@@ -19,12 +19,13 @@
 package org.openapitools.generator.gradle.plugin.tasks
 
 import io.swagger.parser.OpenAPIParser
+import io.swagger.v3.parser.core.models.ParseOptions
 import org.gradle.api.DefaultTask
 import org.gradle.api.GradleException
+import org.gradle.api.logging.Logging
 import org.gradle.api.tasks.Internal
 import org.gradle.api.tasks.TaskAction
 import org.gradle.api.tasks.options.Option
-import org.gradle.api.logging.Logging
 import org.gradle.internal.logging.text.StyledTextOutput
 import org.gradle.internal.logging.text.StyledTextOutputFactory
 import org.gradle.kotlin.dsl.property
@@ -71,7 +72,11 @@ open class ValidateTask : DefaultTask() {
         val recommendations = recommend.get()
 
         logger.quiet("Validating spec $spec")
-        val result = OpenAPIParser().readLocation(spec, null, null)
+
+        val options = ParseOptions()
+        options.isResolve = true
+        
+        val result = OpenAPIParser().readLocation(spec, null, options)
         val messages = result.messages.toSet()
         val out = services.get(StyledTextOutputFactory::class.java).create("openapi")