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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"NPE in AccessTokenRequestParams#addExtraParameters method","articleBody":"https://github.com/scribejava/scribejava/blob/8970e8eeb0aff840d0b223890e9c392ee19218f7/scribejava-core/src/main/java/com/github/scribejava/core/oauth/AccessTokenRequestParams.java#L45\n\nThe method throw NullPointerException each time that it call when the class variable `extraParameters` is null because the initialisation is done for the parameter variable and not for the class variable with the same name. The `this.` is missing.\n\n\n```\n    public AccessTokenRequestParams addExtraParameters(Map\u003cString, String\u003e extraParameters) {\n        if (extraParameters == null || extraParameters.isEmpty()) {\n            return this;\n        }\n        if (this.extraParameters == null) {\n            extraParameters = new HashMap\u003c\u003e(); // Error\n        }\n        this.extraParameters.putAll(extraParameters);\n        return this;\n    }\n```\n\nIt should be :\n```\n        if (this.extraParameters == null) {\n            this.extraParameters = new HashMap\u003c\u003e();\n        }\n```","author":{"url":"https://github.com/NathalieGprog","@type":"Person","name":"NathalieGprog"},"datePublished":"2025-04-18T13:40:13.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/1082/scribejava/issues/1082"}