Weird behavior with java, hibernate.initialize()

Question

I am noticing a weird behavior when I perform some basic checks using objects that have been .initialize()'ed using Hibernate.

The following 'if condition' fails even when it is supposed to pass:

 for (int j = 0; j < trcList.size(); j++) { if (trcList.get(j).getABC().getId() == abc.getId()) { //do something break; } }

However if I change it slightly, it passes where expected. In the snippet below, I grab the LHS value in a local variable and use that for comparison:

 for (int j = 0; j < trcList.size(); j++) { int x = trcList.get(j).getABC().getId(); if (x == abc.getId()) { //do something break; } }

trcList is an ArrayList created from an array of objects grabbed from a database using hibernate. Various fields in those objects including 'ABC' have been Hibernate.initialize()'ed.

 Session session = null; try { session = HibernateUtil.initializeHibernateConnection(session); Criteria cr = ... //specify search criteria List results = cr.list(); TRC[] trcArray = new TRC[results.size()]; for (int i = 0; i < results.size(); i++) { trcArray[i] = (TRC) results.get(i); if (trcArray[i].getABC() != null) { Hibernate.initialize(trcArray[i].getABC()); } } session.getTransaction().commit(); return trcArray; } catch (RuntimeException re) { log.error("get failed", re); throw re; }

getId() returns the row id (primary key) from the table (an integer) — Vishal
– Vishal, Commented Jan 21, 2014 at 14:40

sanbhat · Accepted Answer · 2014-01-21 11:09:07Z

I suspect trcList.get(j).getABC().getId() is java.lang.Integer and hence it should be compared with equals()

if (trcList.get(j).getABC().getId().equals(abc.getId())) { }

Below test will assert the same

Integer i = new Integer(1); //set to 1 Integer j = new Integer(1); //also set to 1 System.out.println(i == j); //false, because it is reference comparison System.out.println(i.equals(j)); //true

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