jave Heap Space

Hai
I have some doubts to ask from you.
When i run my below code in rapid miner i get the error heap space problem.
i have 2GB RAM only and my data set is like 2 regular attributes, 50000 example.

DO i have any other changes to be done to get the result like improve my code / do I need to upgrade my RAM .

<operator name="Root" class="Process" expanded="yes">     <operator name="CSVExampleSource" class="CSVExampleSource">         <parameter key="filename" value="C:\b9.csv"/>     </operator>     <operator name="Numerical2Polynominal" class="Numerical2Polynominal">     </operator>     <operator name="Aggregation" class="Aggregation">         <list key="aggregation_attributes">           <parameter key="item" value="count"/>         </list>         <parameter key="group_by_attributes" value="tid|item"/>     </operator>     <operator name="Example2AttributePivoting" class="Example2AttributePivoting">         <parameter key="group_attribute" value="tid"/>         <parameter key="index_attribute" value="item"/>     </operator>     <operator name="ChangeAttributeRole" class="ChangeAttributeRole">         <parameter key="name" value="tid"/>     </operator>     <operator name="UserBasedDiscretization" class="UserBasedDiscretization">         <list key="classes">           <parameter key="yes" value="1.0"/>           <parameter key="no" value="0.0"/>         </list>     </operator>     <operator name="FPGrowth" class="FPGrowth">         <parameter key="min_support" value="0.2"/>     </operator>     <operator name="AssociationRuleGenerator" class="AssociationRuleGenerator">         <parameter key="keep_frequent_item_sets" value="true"/>         <parameter key="min_confidence" value="0.4"/>     </operator>     <operator name="ResultWriter" class="ResultWriter">         <parameter key="result_file" value="C:\Documents and Settings\svpriyan\Desktop\7to13res.res"/>     </operator> </operator>

thanks
Priyan