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POBSON Decoder exception
 

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  1. POBSON Decoder exception
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    <p>Since Mongo uses BSON, I am using the BSONDecoder from Java API to get the BSON document from the Mongo query and print the string output. In the following a byte[] array stores the bytes of the MongoDB document (when I print the hex values they are the same as in Wireshark)</p> <pre><code> byte[] array = byteBuffer.array(); BasicBSONDecoder decoder = new BasicBSONDecoder(); BSONObject bsonObject = decoder.readObject(array); System.out.println(bsonObject.toString()); </code></pre> <p>I get the following error:</p> <pre><code> org.bson.BSONException: should be impossible </code></pre> <p>Caused by: java.io.IOException: unexpected EOF at org.bson.BasicBSONDecoder$BSONInput._need(BasicBSONDecoder.java:327) at org.bson.BasicBSONDecoder$BSONInput.read(BasicBSONDecoder.java:364) at org.bson.BasicBSONDecoder.decodeElement(BasicBSONDecoder.java:118) at org.bson.BasicBSONDecoder._decode(BasicBSONDecoder.java:79) at org.bson.BasicBSONDecoder.decode(BasicBSONDecoder.java:57) at org.bson.BasicBSONDecoder.readObject(BasicBSONDecoder.java:42) at org.bson.BasicBSONDecoder.readObject(BasicBSONDecoder.java:32) ... 4 more</p> <p>Looking on the implementation <a href="https://github.com/mongodb/mongo-java-driver/blob/master/src/main/org/bson/LazyBSONDecoder.java" rel="nofollow">https://github.com/mongodb/mongo-java-driver/blob/master/src/main/org/bson/LazyBSONDecoder.java</a> it looks that it is caught in </p> <pre><code> throw new BSONException( "should be impossible" , ioe ); </code></pre> <p>The above takes place in query to the database (by query I mean that byte[] array contains all the bytes after the document length). The query itself contains a string "ismaster" or in hex is "x10 ismaster x00 x01 x00 x00 x00 x00". I suspect it is the BSON format of {isMaster: 1}, but I still do not understand why it fails.</p>
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    1. This table or related slice is empty.
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    1. USIoannis Pappas
    1. USIoannis Pappas
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POBSON Decoder exception
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
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      1. POBSON Decoder exception
      1. This table or related slice is empty.
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    1. COwhat version of driver and mongodb is this?
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      1. USAsya Kamsky
    2. COI am calling the mongo-2.8.0.jar in the classpath, and I have installed the 2.0.4-1ubuntu2 from Synaptic.
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      1. USIoannis Pappas
 

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