How to resolve java.lang.OutOfMemoryError error by "java.lang.String", loaded by "<system class loader>" Eclipse Memory Analyzer -

i reading large xml files , storing them database. arond 800 mb.

it stores many records , terminates , gives exception:

exception in thread "main" java.lang.outofmemoryerror: java heap space     @ java.util.identityhashmap.resize(unknown source)     @ java.util.identityhashmap.put(unknown source) 

using memory analyzer have created .hprof files says:

  76,581 instances of "java.lang.string", loaded "<system class loader>" occupy 1,04,34,45,504 (98.76%) bytes.   keywords java.lang.string 

i have setters , getters retrieving values.how resolve issue. appreaciated.

i have done increasing memory through jre .ini. problem doesn't solved

edit: using scireumopen read xml files.

example code have used:

public void readd() throws exception {          xmlreader reader = new xmlreader();          reader.addhandler("node", new nodehandler() {              @override             public void process(structurednode node) {                 try {                        obj.setname(node                             .querystring("name"));                      save(obj);                  } catch (xpathexpressionexception xpathexpressionexception) {                     xpathexpressionexception.printstacktrace();                 } catch (exception exception) {                     exception.printstacktrace();                 }             }         });          reader.parse(new fileinputstream(                 "c:/users/some_file.xml"));      }      public void save(reader obj) {          try {             entitytransaction entitytransaction = em.gettransaction();             entitytransaction.begin();             entity e1=new entity;             e1.setname(obj.getname());              em.persist(e1);             entitytransaction.commit();          } catch (exception exception) {             exception.printstacktrace();         }     } 

try using parser xml processing.

processing 1 big xml file 800m using e.g. dom not feasible takes memory.

try using sax ot stax in java , process parsing results @ once without trying load complete xml file memory.

and don't keep parsing result in memory in total. write them fast possible database , scope parsing results narrow possible.

perhaps use intermediate tables in database , processing part on datasets inside database.