OutofMemoryError - Please Help

Question

Hello,
I am using an ArrayList with a huge volume of data.
Each element is an array with a String, 10 int values & 10 double values.
I get "OutOfMemoryError" even though I have set -Xms10m -Xmx512m as runtime parameters.
I even tried breaking the arraylist into two but no result.
Please advise.

Answer 1

Thank you very much for the replies.
Have you done the math to figure out how much data that is? How many elements in the arraylist?It is 1 million elements. Each element is an array containing 21 strings (all datatypes are converted to strings).
I get "OutOfMemoryError" even though I have set -Xms10m -Xmx512m as runtime parameters.
Set it higher I guessI have tried different combinations. Setting -Xmx1024m causes the system to hang.
I even tried breaking the arraylist into two but no result.
Why would that make any difference?I did it with the idea to reduce memory usage, thinking that only the arraylist that is needed will be loaded. But after going through some articles, I understand that it is not the way it works.
Memory leaksThis is something I am trying to figure out. I do not see any memory leaks in the code below.
But after running it several times, the system slows down considerably. Can someone help on this:
//Main Program
public class DataManipulateTest
     public static void main(String args[])
Manipulate a = new Manipulate();
try
               scanner = new Scanner(new File("keyValues.txt"));
          catch (FileNotFoundException e)
               e.printStackTrace();
               return;
int elementSize = 21;
int size = 1000000;
                    array = new String[elementSize];
               a.createDataHolder(size, elementSize);
               int i;
               int j = 1;
               Double k = 45.60d;
//Populating an array          
while (scanner.hasNext() && incTillSize < size)               
               {     array[0] = scanner.next();
                    for (i=1; i < 11; i++)
                    { array[i] = "" + j; j++; }
                    for (i=11; i < 21; i++)
                    { array[i] = k.toString(); k++;}
                    a.populateDataHolder(array);                    incTillSize++;               
//Code to search for element
//Code to insert element
//Manipulate.java
class Manipulate
     void createHolder(int noOfRecords, int elementSize)
               //Initialise variables, array & collection
          void populateHolder(String[] s)
               System.arraycopy(s, 0, sArray[noOfRecordsCount], 0, this.elementSize);               
               noOfRecordsCount++;          
          int getPosition(String key, int keyPos)
          {     int index = -1;
               if (FORM_LIST == 0)
//Creating an arrayList of arrays                    this.aList = new ArrayList<String[]>(this.size);
                    List<String[]> l = Arrays.asList(sArray);
                    aList.addAll(new ArrayList<String[]>(l));
                    l=null;                    
                    FORM_LIST = 1;                              
                    allFieldsType = st.setAllTokensType(aList.get(1));
          //Initialise member variables
               this.keyPos = keyPos - 1;                               
               this.keyType = allFieldsType[this.keyPos]; //Get the datatype of the search key
               index = getIndex(key);
               return index;
//...some more code
     }Thanks
Edited by: jeno on Dec 11, 2007 9:24 PM to add comments