So many instance of JRTemplatePrintText, SimpleTextFormat and JRTemplatePrintFrame

[dthnam90]

Hi all,

I'm troubleshuting the RAM usage of jasper library (using jmap -histo) and realiza that there are so many instances of JRTemplatePrintText, SimpleTextFormat and JRTemplatePrintFrame:

 num     #instances         #bytes  class name

----------------------------------------------

   1:       7034450      844134000  net.sf.jasperreports.engine.fill.JRTemplatePrintText

   2:       8586233      256002896  [C

   3:       8585462      206051088  java.lang.String

   4:       1476040       96613168  [Ljava.lang.Object;

   5:       2813773       90040736  net.sf.jasperreports.engine.fill.SimpleTextFormat

   6:       1406890       67530720  net.sf.jasperreports.engine.fill.JRTemplatePrintFrame

   7:       1429612       45747584  java.util.HashMap$Entry

   8:       1406889       45020448  net.sf.jasperreports.engine.util.LinkedMap$LinkedValue

   9:       1414013       33936312  java.util.ArrayList

  10:       1406886       33765264  net.sf.jasperreports.engine.fill.ElementEvaluationAction

  11:       1409016       22544256  java.lang.Integer

  12:          1892        8958152  [Ljava.util.HashMap$Entry;

  13:         49949        7594672  <constMethodKlass>

....................

 

Can anyone explain for me why we need to use so many these duplicated instances? What is the meaning of them? I think it should be small (around 1-100 instances) since I only have some templates.

Thanks,

Nam Dam