Runtime exception when using conformance checks

[ChadKillingsworth]

Starting with the 20250402 release, I receive a runtime exception when using a conformance check proto file.

java.lang.RuntimeException: java.lang.IllegalStateException: Generated message class "com.google.javascript.jscomp.ConformanceConfig$LibraryLevelNonAllowlistedConformanceViolationsBehavior" missing method "valueOf".
	at com.google.javascript.jscomp.CommandLineRunner.loadConformanceConfig(CommandLineRunner.java:2146)
	at com.google.javascript.jscomp.CommandLineRunner.loadConformanceConfigs(CommandLineRunner.java:2123)
	at com.google.javascript.jscomp.CommandLineRunner.createOptions(CommandLineRunner.java:1986)
	at com.google.javascript.jscomp.AbstractCommandLineRunner.doRun(AbstractCommandLineRunner.java:1146)
	at com.google.javascript.jscomp.AbstractCommandLineRunner.run(AbstractCommandLineRunner.java:524)
	at com.google.javascript.jscomp.CommandLineRunner.main(CommandLineRunner.java:2280)
	at java.base@21.0.2/java.lang.invoke.LambdaForm$DMH/sa346b79c.invokeStaticInit(LambdaForm$DMH)
Caused by: java.lang.IllegalStateException: Generated message class "com.google.javascript.jscomp.ConformanceConfig$LibraryLevelNonAllowlistedConformanceViolationsBehavior" missing method "valueOf".
	at com.google.protobuf.GeneratedMessage.getMethodOrDie(GeneratedMessage.java:1950)
	at com.google.protobuf.GeneratedMessage$FieldAccessorTable$SingularEnumFieldAccessor.<init>(GeneratedMessage.java:2879)
	at com.google.protobuf.GeneratedMessage$FieldAccessorTable.ensureFieldAccessorsInitialized(GeneratedMessage.java:2090)
	at com.google.javascript.jscomp.ConformanceConfig$Builder.internalGetFieldAccessorTable(ConformanceConfig.java:480)
	at com.google.protobuf.GeneratedMessage$Builder.newBuilderForField(GeneratedMessage.java:607)
	at com.google.protobuf.MessageReflection$BuilderAdapter.newMessageFieldInstance(MessageReflection.java:598)
	at com.google.protobuf.MessageReflection$BuilderAdapter.newMergeTargetForField(MessageReflection.java:613)
	at com.google.protobuf.TextFormat$Parser.consumeFieldValue(TextFormat.java:2254)
	at com.google.protobuf.TextFormat$Parser.consumeFieldValues(TextFormat.java:2195)
	at com.google.protobuf.TextFormat$Parser.mergeField(TextFormat.java:2104)
	at com.google.protobuf.TextFormat$Parser.mergeField(TextFormat.java:1973)
	at com.google.protobuf.TextFormat$Parser.merge(TextFormat.java:1960)
	at com.google.protobuf.TextFormat$Parser.merge(TextFormat.java:1852)
	at com.google.protobuf.TextFormat.merge(TextFormat.java:1645)
	at com.google.javascript.jscomp.CommandLineRunner.loadConformanceConfig(CommandLineRunner.java:2144)
	... 6 more
Caused by: java.lang.NoSuchMethodException: com.google.javascript.jscomp.ConformanceConfig$LibraryLevelNonAllowlistedConformanceViolationsBehavior.valueOf(com.google.protobuf.Descriptors$EnumValueDescriptor)
	at java.base@21.0.2/java.lang.Class.checkMethod(DynamicHub.java:1075)
	at java.base@21.0.2/java.lang.Class.getMethod(DynamicHub.java:1060)
	at com.google.protobuf.GeneratedMessage.getMethodOrDie(GeneratedMessage.java:1947)
	... 20 more

My conformance config is:

requirement: {
  type: CUSTOM
  java_class: 'com.google.javascript.jscomp.ConformanceRules$BanUnknownThis'
  error_message: 'References to "this" that are typed as "unknown" are not allowed. See http://go/closure-js-conformance#unknownThis'
  whitelist: 'node_modules/google-closure-library/closure/goog/base.js'
}

requirement: {
  type: BANNED_NAME
  value: 'console.log'
  error_message: 'Calling console.log is forbidden. Use bannoWeb.console.log instead.'
  whitelist: 'projects/banno-online/src/js/bannoweb.js'
  whitelist: 'node_modules/google-closure-library/closure/goog/base.js'
  whitelist: 'projects/banno-online/src/js/bootstrap.js'
  whitelist: 'projects/banno-online/src/js/util/browser-detection.js'
}

requirement: {
  type: BANNED_NAME
  value: 'console.warn'
  error_message: 'Calling console.warn is forbidden. Use bannoWeb.console.warn instead.'
  whitelist: 'projects/banno-online/src/js/bannoweb.js'
  whitelist: 'node_modules/google-closure-library/closure/goog/base.js'
  whitelist: 'projects/banno-online/src/js/bootstrap.js'
}

requirement: {
  type: BANNED_NAME
  value: 'console.error'
  error_message: 'Calling console.error is forbidden. Use bannoWeb.console.error instead.'
  whitelist: 'projects/banno-online/src/js/bannoweb.js'
  whitelist: 'node_modules/google-closure-library/closure/goog/base.js'
  whitelist: 'projects/banno-online/src/js/bootstrap.js'
  whitelist: 'node_modules/@jack-henry/web-component-router/lib/page.js'
  whitelist: 'projects/banno-online/node_modules/@jack-henry/web-component-router/lib/page.js'
}

[ChadKillingsworth]

The 20250226 release does not have this issue

[brad4d]

Rishi, can you help resolve this?

[rishipal]

I've seen that error before even in google3. We had to modify our proguard config (go/ProGuard) and explicitly tell it to preserve those methods on enums in protos.

-keepclassmembers class com.google.javascript.jscomp.ConformanceConfig$LibraryLevelNonAllowlistedConformanceViolationsBehavior {
    public *;
}

Perhaps we need to do something similar in the OSS version.

[ChadKillingsworth]

Well that's enough info for me to look further. With that hint I tested the java version and it works fine. That means this is a GRAALVM issue.