Grails 7, Gracefully handle different JDK versions between Release and Snapshot versions

[jamesfredley]

Switching from 6.0.21 to 7.0.0-SNAPSHOT currently causes the UI (https://start.grails.org/) to display a blank screen due to Java 11 no longer being a supported option in 7.0.0-SNAPSHOT.

This could alternatively be addressed on: https://github.com/grails/grails-forge-ui

If binding fails, it should default to JdkVersion.DEFAULT_OPTION instead of returning a 400 error (Bad request).

https://snapshot.grails.org/application-types/WEB/features/default?gorm=HIBERNATE&servlet=TOMCAT&test=SPOCK&javaVersion=JDK_11

{"message":"Bad Request","_links":{"self":{"href":"/application-types/WEB/features/default?gorm=HIBERNATE&servlet=TOMCAT&test=SPOCK&javaVersion=JDK_11","templated":false}},"_embedded":{"errors":[{"message":"Failed to convert argument [javaVersion] for value [JDK_11] due to: No enum constant org.grails.forge.options.JdkVersion.JDK_11","path":"/javaVersion"}]}}

https://snapshot.grails.org/application-types/WEB/features?gorm=HIBERNATE&servlet=TOMCAT&test=SPOCK&javaVersion=JDK_11

{"message":"Bad Request","_links":{"self":{"href":"/application-types/WEB/features?gorm=HIBERNATE&servlet=TOMCAT&test=SPOCK&javaVersion=JDK_11","templated":false}},"_embedded":{"errors":[{"message":"Failed to convert argument [javaVersion] for value [JDK_11] due to: No enum constant org.grails.forge.options.JdkVersion.JDK_11","path":"/javaVersion"}]}}

grails-forge/grails-forge-api/src/main/java/org/grails/forge/api/ApplicationController.java

Lines 166 to 214 in a6860ba

	@Override
	@Get("/application-types/{type}/features{?gorm,servlet,test,javaVersion}")
	public FeatureList features(ApplicationType type,
	RequestInfo requestInfo,
	@Nullable TestFramework test,
	@Nullable GormImpl gorm,
	@Nullable ServletImpl servlet,
	@Nullable JdkVersion javaVersion) {
	List<FeatureDTO> featureDTOList = featureOperations
	.getFeatures(requestInfo.getLocale(),
	type,
	new Options(test != null ? test.toTestFramework() : null,
	gorm == null ? GormImpl.DEFAULT_OPTION : gorm,
	servlet == null ? ServletImpl.DEFAULT_OPTION : servlet,
	javaVersion == null ? JdkVersion.DEFAULT_OPTION : javaVersion,
	getOperatingSystem(requestInfo.getUserAgent())));
	final FeatureList featureList = new FeatureList(featureDTOList);
	featureList.addLink(
	Relationship.SELF,
	requestInfo.self()
	);
	return featureList;
	}
	@Override
	@Get("/application-types/{type}/features/default{?gorm,servlet,test,javaVersion}")
	public FeatureList defaultFeatures(ApplicationType type,
	RequestInfo requestInfo,
	@Nullable TestFramework test,
	@Nullable GormImpl gorm,
	@Nullable ServletImpl servlet,
	@Nullable JdkVersion javaVersion) {
	List<FeatureDTO> featureDTOList = featureOperations
	.getDefaultFeatures(requestInfo.getLocale(),
	type,
	new Options(test != null ? test.toTestFramework() : null,
	gorm == null ? GormImpl.DEFAULT_OPTION : gorm,
	servlet == null ? ServletImpl.DEFAULT_OPTION : servlet,
	javaVersion == null ? JdkVersion.DEFAULT_OPTION : javaVersion,
	getOperatingSystem(requestInfo.getUserAgent())));
	final FeatureList featureList = new FeatureList(featureDTOList);
	featureList.addLink(
	Relationship.SELF,
	requestInfo.self()
	);
	return featureList;
	}