Increasing heap space in Eclipse: (java.lang.OutOfMemoryError)

Question

try {     // CompareRecord record = new CompareRecord();     Connection conn = new CompareRecord().getConection("eliteddaprd","eliteddaprd","192.168.14.104","1521");     ResultSet res = null;      if (conn != null){         Statement stmt = conn.createStatement();         res = stmt.executeQuery("select rowindx,ADDRLINE1 from dedupinitial order by rowindx");     }      Map<Integer,String> adddressMap = new LinkedHashMap<Integer, String>();     if (res != null){         System.out.println("result set is not null ");         while(res.next()){             adddressMap.put(res.getInt(1),res.getString(2));         }     }      System.out.println("address Map size =========> "+adddressMap.size());     Iterator it = adddressMap.entrySet().iterator();     int count = 0;     int min = 0;      while (it.hasNext()){         Map.Entry pairs = (Map.Entry)it.next();         Pattern p = Pattern.compile("[,\\s]+");         Integer outerkey = (Integer)pairs.getKey();         String outerValue = (String)pairs.getValue();         //System.out.println("outer Value ======> "+outerValue);          String[] outerresult = p.split(outerValue);         Map.Entry pairs2 = null;         count++;         List<Integer> dupList = new ArrayList<Integer>();          Iterator innerit = adddressMap.entrySet().iterator();         boolean first = true;          while (innerit.hasNext()){             //System.out.println("count value ===> "+count);             int totmatch = 0;             if(first){                 if(count == adddressMap.size()){                     break;                 }                 for(int i=0;i<=count;i++){                     pairs2 = (Map.Entry)innerit.next();                 }                 first  = false;             }             else{                 pairs2 = (Map.Entry)innerit.next();             }             Integer innterKey = (Integer)pairs2.getKey();             String innerValue = (String)pairs2.getValue();             //System.out.println("innrer value "+innerValue);             String[] innerresult = p.split(innerValue);              for(int j=0;j<outerresult.length;j++){                 for(int k=0;k<innerresult.length;k++){                     if(outerresult[j].equalsIgnoreCase(innerresult[k])){                         //System.out.println(outerresult[j]+" Match With "+innerresult[k]);                         totmatch++;                         break;                     }                 }             }              min = Math.min(outerresult.length, innerresult.length);             if(min != 0 && ((totmatch*100)/min) > 50) {                 //System.out.println("maching inner key =========> "+innterKey);                 dupList.add(innterKey);             }         }         //System.out.println("Duplilcate List Sisze ===================> "+dupList.size()+"   "+outerkey);     }      System.out.println("End  =========> "+new Date()); } catch (Exception e) {     e.printStackTrace(); } 

Here ResultSet have processed around 500000 records, but it will give me error like:

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space     at java.util.HashMap.resize(HashMap.java:508)     at java.util.LinkedHashMap.addEntry(LinkedHashMap.java:406)     at java.util.HashMap.put(HashMap.java:431)     at spite.CompareRecord.main(CompareRecord.java:91) 

I know this error comes because of VM memory, but don't know how to increase it in Eclipse?

What do I do if I have to process even more than 500,000 records?

Answer 1

In Run->Run Configuration find the Name of the class you have been running, select it, click the Arguments tab then add:

-Xms512M -Xmx1524M

to the VM Arguments section