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   4 <title>javax.print.event package</title>
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  31 Package javax.print.event contains event classes  and listener interfaces.
  32 <p>
  33 They may be used to monitor both print services (such as printers going
  34 on-line &amp; off-line), and the progress of a specific print job.
  35 <P>
  36 Please note: In the javax.print APIs, a null reference parameter to methods 
  37 is incorrect unless explicitly documented on the method as having a meaningful
  38 interpretation. Usage to the contrary is incorrect coding and may result
  39 in a run time exception either immediately or at some later time.
  40 IllegalArgumentException and NullPointerException are examples of
  41 typical and acceptable run time exceptions for such cases.
  42 <P>
  43 @since 1.4
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