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NPE in AccessTokenRequestParams#addExtraParameters method #1082

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@NathalieGprog

Description

@NathalieGprog

The method throw NullPointerException each time that it call when the class variableextraParameters is null because the initialisation is done for the parameter variable and not for the class variable with the same name. Thethis. is missing.

    public AccessTokenRequestParams addExtraParameters(Map<String, String> extraParameters) {        if (extraParameters == null || extraParameters.isEmpty()) {            return this;        }        if (this.extraParameters == null) {            extraParameters = new HashMap<>(); // Error        }        this.extraParameters.putAll(extraParameters);        return this;    }

It should be :

        if (this.extraParameters == null) {            this.extraParameters = new HashMap<>();        }

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