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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"scenegraph.io Problem with OrderedGroup","articleBody":"When writing an OrderedGroup that has its index array set to null, j3d throws:\njava.lang.NullPointerException\nat\ncom.sun.j3d.utils.scenegraph.io.state.javax.media.j3d.OrderedGroupState.writeObject(OrderedGroupState.java:63)\n\nNot sure if this is a bug, as one can always set the array, but considering Null is a legit value regarding the official OrderedGroupState docs, it would be nice if OrderedGroupState could handle an empty index array.\n\npsymagic commented 21 hours ago\nAfter investigating a little further, it really seems like someone forgot to implement io for the case of OrderedGroup.getChildIndexOrder() == null.\n\nJust did a working fix with these lines in com.sun.j3d.utils.scenegraph.io.state.javax.media.j3d.OrderedGroupState:\n\n@Override\npublic void writeObject(DataOutput out) throws IOException {\n    super.writeObject(out);\n\n```\nint[] childIndexOrder = ((OrderedGroup) node).getChildIndexOrder();\n\nif (childIndexOrder == null) {\n    out.writeInt(0);\n} else {\n    out.writeInt(childIndexOrder.length);\n    for (int i = 0; i \u003c childIndexOrder.length; i++) {\n        out.writeInt(childIndexOrder[i]);\n    }\n}\n```\n\n}\n\n@Override\npublic void readObject(DataInput in) throws IOException {\n    super.readObject(in);\n\n```\nint length = in.readInt();\nint[] childIndexOrder;\n\nif (length == 0) {\n    childIndexOrder = null;\n} else {\n    childIndexOrder = new int[length];\n    for (int i = 0; i \u003c childIndexOrder.length; i++) {\n        childIndexOrder[i] = in.readInt();\n    }\n}\n((OrderedGroup) node).setChildIndexOrder(childIndexOrder);\n```\n\n}\nIt might not be perfect thou.\n","author":{"url":"https://github.com/psymagic","@type":"Person","name":"psymagic"},"datePublished":"2016-01-11T17:39:25.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/3/java3d-utils/issues/3"}