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From "Kevin Bulebush (JIRA)" <j...@apache.org>
Subject [jira] Created: (SSHD-104) FormatFlagsConversionMismatchException when using IBM JVM. Format String is invalid.
Date Tue, 25 Jan 2011 17:16:44 GMT
FormatFlagsConversionMismatchException when using IBM JVM. Format String is invalid.
------------------------------------------------------------------------------------

                 Key: SSHD-104
                 URL: https://issues.apache.org/jira/browse/SSHD-104
             Project: MINA SSHD
          Issue Type: Bug
    Affects Versions: 0.5.0, 0.6.0
         Environment: IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 Linux x86-32 jvmxi3260sr8ifx-20100609_59383
(JIT enabled, AOT enabled)
2.6.35-24-generic #42-Ubuntu SMP (Ubuntu 10.10)
            Reporter: Kevin Bulebush
            Priority: Critical
             Fix For: 0.6.0


The following exception is thrown when using SFTP client FileZilla and Mina is running on
the IBM JVM: 
java.util.FormatFlagsConversionMismatchException: Mismatched Convertor =s, Flags= #
	at java.util.Formatter$Transformer.transformFromString(Formatter.java:1020)
	at java.util.Formatter$Transformer.transform(Formatter.java:861)
	at java.util.Formatter.format(Formatter.java:565)
	at java.util.Formatter.format(Formatter.java:509)
	at java.lang.String.format(String.java:1960)
	at org.apache.sshd.server.sftp.SftpSubsystem.getLongName(SftpSubsystem.java:843)
	at org.apache.sshd.server.sftp.SftpSubsystem.sendPath(SftpSubsystem.java:806)
	at org.apache.sshd.server.sftp.SftpSubsystem.process(SftpSubsystem.java:719)
	at org.apache.sshd.server.sftp.SftpSubsystem.run(SftpSubsystem.java:331)
	at java.lang.Thread.run(Thread.java:736)

Latest source shows the problem line:
847	        long length = f.getSize();
848	        String lengthString = String.format("%1$#8s", length);

Simple test code also reproduces the problem:
    public static void main(String [] args) {
        long length = 12312342;
        String lengthString = String.format("%1$#8s", length);
        System.out.println(lengthString);
    }

If I understand the Formatter class documentation, I'm surprised the format call works at
all on the Sun JVM. It says the # flag is only applicable for Integral types with o, x, and
X conversions only.  Further down in the documentation for 's' conversion, it says 

"If the '#' flag is given and the argument is not a Formattable , then a FormatFlagsConversionMismatchException
will be thrown."

Assuming the long above is autoboxed to Long, Long does not implement Formattable.  

I believe a different method should be used for converting this long to string.  I'm not sure
of the original intent, but maybe the the 'd' conversion was intended rather than the 's'
conversion to output the long in base 10, but then I don't understand the use of  #.  

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