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https://issues.apache.org/jira/browse/ZOOKEEPER-2763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16017019#comment-16017019
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ASF GitHub Bot commented on ZOOKEEPER-2763:
-------------------------------------------

Github user alburthoffman commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/238#discussion_r117419956
  
    --- Diff: src/java/main/org/apache/jute/Utils.java ---
    @@ -190,19 +190,32 @@ static String fromCSVString(String s) throws 
IOException {
         }
         
         /**
    +     * convert byte array to a string in hex format
          * 
    -     * @param s 
    -     * @return 
    +     * @param barr
    +     * @return
          */
    -    static String toXMLBuffer(byte barr[]) {
    --- End diff --
    
    I'm not able to dig into Zookeeper internal to find the root cause.
    but this link would help:
    
http://stackoverflow.com/questions/12498256/why-the-npe-using-static-method-of-datatypeconverter
    
https://developer.ibm.com/answers/questions/200553/jaxb-datatypeconverter-throws-nullpointerexception.html



> Utils.toCsvBuffer() omits leading 0 for bytes < 0x10
> ----------------------------------------------------
>
>                 Key: ZOOKEEPER-2763
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2763
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: jute
>    Affects Versions: 3.5.2
>            Reporter: Brandon Berg
>            Assignee: Alburt Hoffman
>            Priority: Minor
>
> org.apache.jute.Utils.toCsvBuffer(), which converts a byte array to a string 
> containing the hex representation of that byte array, omits the leading zero 
> for any byte less than 0x10, due to its use of Integer.toHexString, which has 
> the same behavior.
> https://github.com/apache/zookeeper/blob/master/src/java/main/org/apache/jute/Utils.java#L234
> One consequence of this is that the hex strings printed by 
> ClientCnxn.Packet.toString(), used in the debug logging for 
> ClientCnxn.readResponse(), cannot be parsed to determine the result of a 
> Zookeeper request from client debug logs.
> Utils.toXmlBuffer() appears to have the same issue.
> {code}



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