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org.hibernate.transientobjectexception

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In this section, you will learn org.hibernate.transientobjectexception it's cause and solution.

org.hibernate.transientobjectexception

In this section, you will learn org.hibernate.transientobjectexception it's cause and solution.

But before discussing it further, you need to know about transient object :

A new persistence class instance, which is not related to a Session and has not contained any value representing row of a database table and also have not contained any identifier value, is considered as transient by Hibernate.

Student student=new Student();
student.setName("Rajesh"); // student is in transient state

You can convert  transient instance into persistence by associating it with a Session as follows :

Long id = (Long) session.save(student);
// person is now in a persistent state

transientobjectexception

The transientobjectexception is thrown when a transient instance is passes to a Session method that expects a persistent instance.

Let us take a simple example :

X is referring to Y using a primary key column of yId of Y.

The mapping of X is something like this :

<class name="net.roseindia.X" table="X" >
<id name="xId" type="java.lang.Long">
<property name="xId" column="x_id" />
</id>
.................
.................
<many-to-one name="yId" class="net.roseindia.Y" fetch="select">
<column name="y_id" not-null="true" />
</many-to-one>
................
................

Now, we want to persist the value of foreign key in X. You have to make sure that instance Y is persistent not transient.

But if you try something like this :

X x = new X();
Y y = new Y();
x.setY(y);
..........
..........
session.save(x);

This will throw org.hibernate.transientobjectexception :

solution

Since Y is in transient state which is the root cause of the problem. To make instance Y persistent, you need to bind y to the session. You can do it like this :

X x = new X();
Y y = session.get(Y.class, new Long(1));
x.setY(y);
.........................
.........................
session.save(x);

The above code will run smoothly without throwing org.hibernate.transientobjectexception .

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Posted on: April 14, 2012

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