[daisy] [JIRA] Created: (DSY-470) backup tool should provide usefull error-msg in case of missing required params

[Marc Portier (JIRA)]

backup tool should provide usefull error-msg in case of missing required params
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         Key: DSY-470
         URL: http://issues.cocoondev.org//browse/DSY-470
     Project: Daisy
        Type: Improvement
  Components: Backup  
    Versions: 2.0.1    
 Reporter: Marc Portier
    Priority: Minor


The daisy-backup-tool requires to have a -l LOCATION option passed to it in the args.
If it is not set a nasty NPE is thrown:

java.lang.NullPointerException
        at java.io.File.<init>(File.java:194)
        at org.outerj.daisy.backupTool.BackupTool.main(BackupTool.java:69)


It would be better to check if the argument is set (I suppose commons cli has stuff for this) and switch to providing the -h output with some additional message if it is not.

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