Eror : OutOfMemoryError (Java): Java heap space

Hi, 
i want to create xlsx sheet, all things seems to be perfect until this erro
message
Erreur : OutOfMemoryError (Java): Java heap space
i have xp system, (32bit)
I tried the following syntax

 options(java.parameters = "-Xmx1000m") 
 options(java.parameters = "-Xms=3670K") 
writeWorksheet(wb, SP, sheet = "SP")

alos this one
options(java.parameters = "-Xmx1000m")

writeWorksheet(wb, SP, sheet = "SP")

Erreur dans .jcheck() : 
  Java Exception <no description because toString()
failed>.jcall("RJavaTools", "Z", "hasField", .jcast(x, "java/lang/Object"),
name)<S4 object of class "jobjRef">
The size of my data is very very huge ( i have to create 3187 sheets of xlsx
to pute the label of variables




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