jmeter script and jmeter memory problem

Hi,
I wrote a jmeter script that one of the steps is using groovy code(attached the code)
During the test I'm monitoring the jmeter process with jconsole. And I see that this code is increasing the PERM GEN of the JVM dramaticly and keep creating full gc.
I changed the jvm to 1024XMS and 1024XMS and 256 Perm gen(I attached the jconsole screen shot.
Is my code in the groovy is bad? Or it's something related to jmeter ?
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[cid:image001.png [ at ] 01D025D8.51BABAA0]Dan zaitoun ||dan [ at ] jajah.com<mailto:dan [ at ] jajah.com| 17 Hatidhar St., Raanana, 43665, Israel | Mobile: +972-54-6880500 |