When making a post request, the server can detect that it received two non-null fields, but returned an error classification: JAVA HTTP Status 500 - Request processing failed; nested exception is java.lang.NullPointerException type Exception report message Request processing failed; nested exception is java.lang.NullPointerException description The server encountered an internal error that prevented it from fulfilling this request. exception o
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Null pointer, it means there is something wrong with your server-side writing. Test the server carefully and you should see an error when accepting empty fields.