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Thread: Exception in thread "Timer-0" java.lang.OutOfMemoryError: Java heap space

  1. #1
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    Post Exception in thread "Timer-0" java.lang.OutOfMemoryError: Java heap space

    i write a java code using time schdular in my program i get the data from databse and it will be updated into anothe databse the task is

    1. i get the data from database for every five minutes
    this program is excuted every time for every 1 minute

    my java code is:

    code=java

    public class updateremindertable {

    private Timer timer=new Timer();
    public static void main(String[] args) throws ParseException {
    // TODO Auto-generated method stub
    updateremindertable manager=new updateremindertable();
    manager.startTask();

    }
    public void data() throws Exception{
    List<Rfid1> r1;
    List<RfidDB> l;

    List<StudentInfo1> l3;
    RfidDB db;

    StudentInfo si;
    StudentInfo1 sb;
    java.util.Date d;

    List<RfidDB> l1 = new ArrayList<RfidDB>();
    List<StudentInfo> l2 = new ArrayList<StudentInfo>();
    l3 = new ArrayList<StudentInfo1>();

    sb = new StudentInfo1();
    si = new StudentInfo();
    java.util.Date d2 = new Date();
    Date d1 = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    Date dateWithoutTime = sdf.parse(sdf.format(d1));

    Calendar c = Calendar.getInstance();
    System.out.println(c.getTime());
    c.add(c.MINUTE, -5);

    System.out.println(c.getTime());

    d2 = c.getTime();

    SessionFactory sf = HibernateUtil.getSessionFactory();
    Session session = sf.openSession();

    Criteria cf = session.createCriteria(RfidDB.class).add(
    Restrictions.between("clock_in", d2, new Date()));
    l = cf.list();
    if (l.size() > 0) {
    Set s0 = new HashSet();
    List p0 = new ArrayList();
    for (RfidDB rf : l) {
    p0.add(rf.getId());
    s0.addAll(p0);
    p0.clear();
    p0.addAll(s0);

    }
    Criteria cf1 = session.createCriteria(RfidDB.class);
    Criterion one = Restrictions.ge("clock_in", dateWithoutTime);
    Criterion two = Restrictions.in("id", p0);
    Criterion complete = Restrictions.conjunction().add(one).add(two);
    cf1.add(complete);

    l1 = cf1.list();
    Set s = new HashSet();
    List pl1 = new ArrayList();
    for (RfidDB sl1 : l1) {
    pl1.add(sl1.getId());
    s.addAll(pl1);
    pl1.clear();
    pl1.addAll(s);
    }
    l2 = session.createCriteria(StudentInfo.class)
    .add(Restrictions.in("uniqueid", pl1)).list();

    List pl2 = new ArrayList();
    Set set = new HashSet();
    for (StudentInfo si1 : l2) {
    pl2.add(si1.getsNo());
    set.addAll(pl2);
    pl2.clear();
    pl2.addAll(set);

    }
    l3 = session.createCriteria(StudentInfo1.class)
    .add(Restrictions.in("sNo", pl2)).list();

    // l3 = cf2.list();
    session.close();
    sf.close();
    SessionFactory sf1 = HibernateUtil.getSessionFactory();
    Session ses = sf1.openSession();
    for (StudentInfo s2 : l2) {
    java.util.Date t = null, t1 = null;
    int count = 0;
    Rfid1 rf;
    rf = new Rfid1();
    for (StudentInfo1 s3 : l3) {
    if (s2.getsNo() == s3.getsNo()) {
    count++;
    }
    }
    int index = 0;
    for (RfidDB s1 : l1) {
    if (s2.getUniqueid().equals(s1.getId())) {
    if (index == 0) {
    t = s1.getClock_in();
    System.out.println(t);
    }
    if (index >= 1) {
    t1 = s1.getClock_in();
    }
    index++;
    }
    }

    Transaction tx1 = ses.beginTransaction();

    rf.setStatus_color("green");
    rf.setUniqueid(s2.getUniqueid());
    rf.setDate(t);
    DateFormat df = new SimpleDateFormat("YYYY-MM-dd");
    String chdate = df.format(t);
    rf.setDate1(chdate);
    rf.setSid(s2.getsNo());
    if (t1 == null) {
    rf.setClock_in(t);
    Date currdate = new Date();
    System.out.println(currdate);

    long remtime1 = t.getTime() + (count * 2 * 60000);
    if (currdate.getTime() >= remtime1) {
    rf.setStatus_color("orange");
    }
    Date currdate1 = new Date();
    long remtime2 = t.getTime() + (count * 3 * 60000);
    if (currdate1.getTime() >= remtime2) {
    rf.setStatus_color("red");
    }
    } else {
    Date currdate = new Date();
    long remtime1 = t.getTime() + (count * 2 * 60000);
    rf.setClock_in(t);
    rf.setClock_out(t1);
    if (t1.getTime() >= remtime1) {
    rf.setStatus_color("orange");
    }
    Date currdate1 = new Date();
    long remtime2 = t.getTime() + (count * 3 * 60000);
    if (t1.getTime() >= remtime2) {
    rf.setStatus_color("red");
    }
    }
    // long diff = (long) ((( t1.getTime()-t.getTime())*1.66667

    System.out.println(rf.getClock_in());
    System.out.println(rf.getClock_out());
    ses.saveOrUpdate(rf);
    tx1.commit();

    }
    ses.close();
    sf1.close();

    }
    }
    public void startTask() {

    timer.schedule(new PeriodicTask(),0);

    }
    private class PeriodicTask extends TimerTask{


    public void run() {
    while(true){
    // TODO Auto-generated method stub
    try{
    data();
    Thread.sleep(60000);
    timer.schedule(new PeriodicTask(),60000);


    }catch(Exception e){
    e.printStackTrace();
    }
    }
    }

    }



    /code
    i get the exception
    Exception in thread "Timer-0" java.lang.OutOfMemoryError: Java heap space
    at java.lang.StringCoding$StringDecoder.decode(Unknow n Source)
    at java.lang.StringCoding.decode(Unknown Source)
    at java.lang.String.<init>(Unknown Source)
    at java.lang.String.<init>(Unknown Source)
    at com.mysql.jdbc.ResultSet.getString(ResultSet.java: 1802)
    at com.mysql.jdbc.Connection.loadServerVariables(Conn ection.java:3368)
    at com.mysql.jdbc.Connection.initializePropsFromServe r(Connection.java:3199)
    at com.mysql.jdbc.Connection.createNewIO(Connection.j ava:1788)
    at com.mysql.jdbc.Connection.<init>(Connection.java:4 40)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonReg isteringDriver.java:400)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at org.hibernate.connection.DriverManagerConnectionPr ovider.getConnection(DriverManagerConnectionProvid er.java:110)
    at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(Sc hemaUpdate.java:118)
    at org.hibernate.impl.SessionFactoryImpl.<init>(Sessi onFactoryImpl.java:252)
    at org.hibernate.cfg.Configuration.buildSessionFactor y(Configuration.java:1043)
    at com.nitspl.HibernateUtil.getSessionFactory(Hiberna teUtil.java:20)
    at com.nitspl.updateremindertable.data(updatereminder table.java:61)
    at com.nitspl.updateremindertable$PeriodicTask.run(up dateremindertable.java:198)
    at java.util.TimerThread.mainLoop(Unknown Source)
    at java.util.TimerThread.run(Unknown Source)



    any one tell me how resolve this problem


  2. #2
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    Default Re: Exception in thread "Timer-0" java.lang.OutOfMemoryError: Java heap space

    Please don't post topics for help in Member introductions sub-forum. I requested a mod to move.

    Post your code in code tags.

    Your error is the same as one will get with infinite recursion, a method calling itself with no exit. Inspect your run() method, and:

    1. determine if the while(true) is needed (it's not);
    2. ask yourself why a new periodic task is being created;
    3. find a better way than sleeping the thread to schedule breaks in a PERIODIC TIMER.

    I recommend you refer to the Java Timer tutorial.

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