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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"packer.writePayload(msg) results in NullPointerException","articleBody":"Hi\n\nIs this a bug or intended behavior?\n\n``` java\nimport org.msgpack.core.MessageBufferPacker;\nimport org.msgpack.core.MessagePack;\n\nimport java.io.IOException;\n\npublic class Main {\n    public static void main(String[] args) {\n        final MessageBufferPacker packer = new MessagePack.PackerConfig()\n                    .newBufferPacker();\n        byte[] msg = new byte[] {\n                    -127, -92, 116, 121, 112, 101, -92, 112, 105, 110, 103};\n        try {\n            packer.writePayload(msg);\n        } catch (IOException e) {\n            e.printStackTrace();\n        }\n        System.out.println(\"Done.\");\n    }\n}\n```\n\nThis results in:\n\n```\nException in thread \"main\" java.lang.NullPointerException\n    at org.msgpack.core.MessagePacker.writePayload(MessagePacker.java:733)\n    at org.msgpack.core.MessagePacker.writePayload(MessagePacker.java:717)\n    at Main.main(Main.java:13)\n    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)\n    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n    at java.lang.reflect.Method.invoke(Method.java:606)\n    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)\n```\n\nI simply want to write raw msgpack bytes to a packer, without any previous header. The bytes already contain the map header.\n","author":{"url":"https://github.com/dbrgn","@type":"Person","name":"dbrgn"},"datePublished":"2016-09-30T11:05:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/391/msgpack-java/issues/391"}