René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Validation of deprecated non-nullable non-default argument is not correct","articleBody":"**Describe the bug**\nGraphQL specification [prohibits](https://github.com/graphql/graphql-spec/blob/September2025/spec/Section%203%20--%20Type%20System.md?plain=1#L2271-L2284) deprecation directive on non-nullable arguments without a default value, but graphql-java allows creation of such schema programmatically although there is validation (`DeprecatedInputObjectAndArgumentsAreValid`) that should prevent that. \n\nLet say a new argument is created like this:\n```\nGraphQLArgument deprecatedArg = GraphQLArgument.newArgument()\n  .name(\"argument\")\n  .type(GraphQLNonNull.nonNull(Scalars.GraphQLString))\n  .deprecate(\"Some very good reason\")\n  .build();\n```\nThe validation then tries to find `deprecated` applied directive:\nhttps://github.com/graphql-java/graphql-java/blob/aa0b31ebf28fdbf17d659800f6e8e6e1381dde50/src/main/java/graphql/schema/validation/DeprecatedInputObjectAndArgumentsAreValid.java#L46\n\nBut `deprecatedDirective` is `null`, and so it's reported as valid schema.  The fix seems to be calling of `argument.isDeprecated()`, or combination of both approaches. \n\n**To Reproduce**\n\n```\nGraphQLArgument deprecatedArg = GraphQLArgument.newArgument()\n        .name(\"input\")\n        .type(GraphQLNonNull.nonNull(Scalars.GraphQLString))\n        .deprecate(\"Some very good reason\")\n        .build();\n\nGraphQLFieldDefinition field = GraphQLFieldDefinition.newFieldDefinition()\n        .name(\"field\")\n        .type(Scalars.GraphQLString)\n        .argument(deprecatedArg)\n        .dataFetcher(env -\u003e env.getArgument(\"input\")) // for simplicity\n        .build();\n\nGraphQLObjectType queryType = GraphQLObjectType.newObject()\n        .name(\"Query\")\n        .field(field)\n        .build();\n\nGraphQLSchema.newSchema()\n        .query(queryType)\n        .build(); // this method internally do the validation and should throw exception\n```\n\nEquivalent schema (implicit parts are omitted):\n```\ntype Query {\n  field(input: String! @deprecated(reason : \"Some very good reason\")): String\n}\n```\n","author":{"url":"https://github.com/Blemicek","@type":"Person","name":"Blemicek"},"datePublished":"2025-12-01T19:50:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/4182/graphql-java/issues/4182"}