I am a newbiee to Java database programming.
Recently during my project, I have got stuck in a concept, which I searched a lot but not getting any solution to satisfy my query, which may help me to get out of my problem.
Actually the problem is:
I have three table, let say one main (which contains common fields of actual data) table and two child table(which contains other different fields according to some criteria). Main table contain some part of information, and rest of information, depending on some criteria, will be saved in only one of the child table.
Now the scenario is like this, I have set autocommit off, then firing one insert query. So, when the insert query will be fired, database will give it a unique ID, in mysql, since the ID feild is autoIncrement. Now firing a Select Query, I want to extract that ID from main table. So, here is my question, Will SELECT QUERY BE ABLE TO EXTRACT THE ID OF THAT PARTICLULAR RECORD I HAVE JUST SAVED? Please remember that autocommit is set to false, and I have not committed yet.
I am doing this because I want that unique ID to be inserted in one of the child tables so that I can relate the information between table. So, After finding the ID, I have again fired a new INSERT query to save rest of the data in one of the child tables, now with the unique ID with rest of the data. And then on successful insertion, I have committed the connection.
Also, I want that either the information is saved in both (main and one of the child) tables or the details does not saves completely if any failure occur, so that I do not lose the partial information.
Please Help me in this. If you can explain what is relation between autocommit, savepoints. When to use, what things are to be remembered. Please provide some genuine resources, if you can, which demonstrate their nature,how they work under different circumstances, etc. I have googled but didn't got any such useful information. I want to get deep knowledge about it.
Thanks in advance :)
It looks like you want to get the ID when the record is added to the table. This is available when you insert the record if you use the getGeneratedKeys(). The autocommit cannot be used to return this.
The following code shows how this can be done.
/**
* Insert to database using JDBC 3.0 + which will return the key of the new row.
*
* #param sql is the sql insert to send to the database
* #return the key for the inserted row
* #throws DBSQLException
*/
public static int insertAndReturnKey(Connection dbConnection, String sql, List<SqlField> params) throws DBSQLException
{
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
String paramList = null;
try {
preparedStatement = dbConnection.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
// Setup your parameters
int result = preparedStatement.executeUpdate();
resultSet = preparedStatement.getGeneratedKeys();
if (resultSet.next()) {
return (resultSet.getInt(1));
} else {
// throw an exception from here
throw new SQLException("Failed to get GeneratedKey for [" + sql + "]");
}
} catch (SQLException ex) {
throw new DBSQLException(buildErrorMessage(ex, sql, params));
} finally {
DBConnector.closeQuietly(preparedStatement);
DBConnector.closeQuietly(resultSet);
}
}
I have a SQL statement which works when executed in MS Server Management Studio and works when submitted from C# but which does not work when submitted from Java (1.6, using sqljdbc4.jar).
The basic problem seems to be selecting into a table variable. Following up on the first comment I've completely re-written this question using simpler examples to show what works and does not work.
The following query:
DECLARE #IsLoadRaw as INT = ?
DECLARE #PrimaryID as varchar(1000) = ?
--Declare temporary table to hold message IDs and fill according to Primary ID.
DECLARE #MessageIDs TABLE ( MessageID BIGINT )
SELECT MessageID FROM Messages WHERE PrimaryID = #PrimaryID
works both in SQL Management Studio and when submitted from Java. In both cases it returns a result set with two MessageIDs (correct for the given PrimaryID I'm using to test).
The following query:
DECLARE #IsLoadRaw as INT = ?
DECLARE #PrimaryID as varchar(1000) = ?
--Declare temporary table to hold message IDs and fill according to Primary ID.
DECLARE #MessageIDs TABLE ( MessageID BIGINT );
INSERT #MessageIDs SELECT MessageID FROM Messages WHERE PrimaryID = #PrimaryID;
SELECT * FROM #MessageIDs;
works in SQL Management Studio where it returns a result set with the same two MessageIDs. When submitted from Java it does not return any result set.
The complete statement, which makes us of #MessageIDs, works when submitted from C# via ADO.NET. I assume the second sample here would work as well. The problem is isolated to Java and seems to relate to using a table variable. Since the code appears correct and runs under SQL Management Studio I'm perplexed as to how to debug this.
Any idea why this is not working from Java? What tools can I use to understand what the server is doing with this query WHEN SUBMITTED FROM Java?
I did some more excavation and found the answer:
INSERT #MessageIDs SELECT MessageID FROM Messages WHERE PrimaryID = #PrimaryID;
when submitted from Java returns an update count. When submitted from C# or from SQL Management Console it does not return an update count. I was not expecting this so it took some digging to find.
The java API for stepping through results of an execute() this is confusing, there are not may examples, and at least one that I found was not fully correct. I'll explain how I understand this to work.
Since most statements are simple, one change or one select, there are convenience execute methods on Statement, such as executeQuerry(), which returns a result set. Most cases use these and that is the end of the story.
If you have a more complex statement which does several things you call execute() and get back a list of things. INSERT, UPDATE, and DELETE (I believe) return a count of records modified. SELECT returns a result set. The result of executing a complex statement is a list of update counts and result sets, in the order they were executed. You then write code that steps through this list, processing each item.
The statement
DECLARE #MessageIDs TABLE ( MessageID BIGINT )
INSERT #MessageIDs SELECT MessageID FROM Messages WHERE PrimaryID = #PrimaryID;
SELECT * FROM Messages WHERE MessageID IN (SELECT MessageID FROM #MessageIDs) ORDER BY MessageID;
SELECT * FROM Attrs WHERE MessageID IN (SELECT MessageID FROM #MessageIDs) ORDER BY MessageID;
returns 2 result sets. In java, and only in java for reasons I don't know, the INSERT #MessageIDs... statement returns an update count, which is the first item in the list.
The java API for this is confusing. Statement.execute() and Statement.getMoreResults() return:
true if the next result is a ResultSet
false if the next result is an update count OR there are no more results
false has two meanings and can not be interpreted to be the end of results. You have to also check for a non-zero update count.
The final, functioning code ended up looking like this:
List<DtaMessage> msgList = new ArrayList<DtaMessage>();
boolean isResult = stmt.execute();
// Skip over update counts.
while (!isResult) {
if (stmt.getUpdateCount() == 0)
// End of results.
return msgList;
isResult = stmt.getMoreResults();
}
// Process first result set.
ResultSet rs = stmt.getResultSet();
while (rs.next())
{
DtaMessage msg = PopulateMessage(rs, isLoadRaw);
msgList.add(msg);
}
rs.close();
// Skip over update counts.
isResult = stmt.getMoreResults();
while (!isResult) {
if (stmt.getUpdateCount() == 0)
// end of results.
return msgList;
isResult = stmt.getMoreResults();
}
// Process second result set.
rs = stmt.getResultSet();
while (rs.next())
{
// process.
}
rs.close();
return msgList;
Though my sample SQL does nothing that would generate an update count between the two result sets this method will process results from several different SQL statements so I added the code to skip over up date counts which may show up in some cases.
I get following hibernate error. I am able to identify the function which causes the issue. Unfortunately there are several DB calls in the function. I am unable to find the line which causes the issue since hibernate flush the session at the end of the transaction. The below mentioned hibernate error looks like a general error. It doesn't even mentioned which Bean causes the issue. Anyone familiar with this hibernate error?
org.hibernate.StaleStateException: Batch update returned unexpected row count from update: 0 actual row count: 0 expected: 1
at org.hibernate.jdbc.BatchingBatcher.checkRowCount(BatchingBatcher.java:93)
at org.hibernate.jdbc.BatchingBatcher.checkRowCounts(BatchingBatcher.java:79)
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:58)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:195)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:235)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:142)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:297)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:985)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:333)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:584)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransacti
onManager.java:500)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManag
er.java:473)
at org.springframework.transaction.interceptor.TransactionAspectSupport.doCommitTransactionAfterReturning(Transaction
AspectSupport.java:267)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:176)
I got the same exception while deleting a record by Id that does not exists at all. So check that record you are updating/Deleting actually exists in DB
Without code and mappings for your transactions, it'll be next to impossible to investigate the problem.
However, to get a better handle as to what causes the problem, try the following:
In your hibernate configuration, set hibernate.show_sql to true. This should show you the SQL that is executed and causes the problem.
Set the log levels for Spring and Hibernate to DEBUG, again this will give you a better idea as to which line causes the problem.
Create a unit test which replicates the problem without configuring a transaction manager in Spring. This should give you a better idea of the offending line of code.
Solution:
In the Hibernate mapping file for the id property, if you use any generator class, for that property you should not set the value explicitly by using a setter method.
If you set the value of the Id property explicitly, it will lead the error above. Check this to avoid this error.
or
It's error show when you mention in the mapping file the field generator="native" or "incremental" and in your DATABASE the table mapped is not auto_incremented
Solution: Go to your DATABASE and update your table to set auto_increment
In my case, I came to this exception in two similar cases:
In a method annotated with #Transactional I had a call to another service (with long times of response). The method updates some properties of the entity (after the method, the entity still exists in the database). If the user requests two times the method (as he thinks it doesn't work the first time) when exiting from the transactional method the second time, Hibernate tries to update an entity which already changed its state from the beginning of the transaction. As Hibernate search for an entity in a state, and found the same entity but already changed by the first request, it throws an exception as it can't update the entity. It's like a conflict in GIT.
I had automatic requests (for monitoring the platform) which update an entity (and the manual rollback a few seconds later). But this platform is already used by a test team. When a tester performs a test in the same entity as the automatic requests, (within the same hundredth of a millisecond), I get the exception. As in the previous case, when exiting from the second transaction, the entity previously fetched already changed.
Conclusion: in my case, it wasn't a problem which can be found in the code. This exception is thrown when Hibernate founds that the entity first fetched from the database changed during the current transaction, so it can't flush it to the database as Hibernate doesn't know which is the correct version of the entity: the one the current transaction fetch at the beginning; or the one already stored in the database.
Solution: to solve the problem, you will have to play with the Hibernate LockMode to find the one which best fit your requirements.
This happened to me once by accident when I was assigning specific IDs to some objects (testing) and then I was trying to save them in the database. The problem was that in the database there was an specific policy for setting up the IDs of the objects. Just do not assign an ID if you have a policy at Hibernate level.
I just encountered this problem and found out I was deleting a record and trying to update it afterwards in a Hibernate transaction.
Hibernate 5.4.1 and HHH-12878 issue
Prior to Hibernate 5.4.1, the optimistic locking failure exceptions (e.g., StaleStateException or OptimisticLockException) didn't include the failing statement.
The HHH-12878 issue was created to improve Hibernate so that when throwing an optimistic locking exception, the JDBC PreparedStatement implementation is logged as well:
if ( expectedRowCount > rowCount ) {
throw new StaleStateException(
"Batch update returned unexpected row count from update ["
+ batchPosition + "]; actual row count: " + rowCount
+ "; expected: " + expectedRowCount + "; statement executed: "
+ statement
);
}
Testing Time
I created the BatchingOptimisticLockingTest in my High-Performance Java Persistence GitHub repository to demonstrate how the new behavior works.
First, we will define a Post entity that defines a #Version property, therefore enabling the implicit optimistic locking mechanism:
#Entity(name = "Post")
#Table(name = "post")
public class Post {
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE)
private Long id;
private String title;
#Version
private short version;
public Long getId() {
return id;
}
public Post setId(Long id) {
this.id = id;
return this;
}
public String getTitle() {
return title;
}
public Post setTitle(String title) {
this.title = title;
return this;
}
public short getVersion() {
return version;
}
}
We will enable the JDBC batching using the following 3 configuration properties:
properties.put("hibernate.jdbc.batch_size", "5");
properties.put("hibernate.order_inserts", "true");
properties.put("hibernate.order_updates", "true");
We are going to create 3 Post entities:
doInJPA(entityManager -> {
for (int i = 1; i <= 3; i++) {
entityManager.persist(
new Post()
.setTitle(String.format("Post no. %d", i))
);
}
});
And Hibernate will execute a JDBC batch insert:
SELECT nextval ('hibernate_sequence')
SELECT nextval ('hibernate_sequence')
SELECT nextval ('hibernate_sequence')
Query: [
INSERT INTO post (title, version, id)
VALUES (?, ?, ?)
],
Params:[
(Post no. 1, 0, 1),
(Post no. 2, 0, 2),
(Post no. 3, 0, 3)
]
So, we know that JDBC batching works just fine.
Now, let's replicate the optimistic locking issue:
doInJPA(entityManager -> {
List<Post> posts = entityManager.createQuery("""
select p
from Post p
""", Post.class)
.getResultList();
posts.forEach(
post -> post.setTitle(
post.getTitle() + " - 2nd edition"
)
);
executeSync(
() -> doInJPA(_entityManager -> {
Post post = _entityManager.createQuery("""
select p
from Post p
order by p.id
""", Post.class)
.setMaxResults(1)
.getSingleResult();
post.setTitle(post.getTitle() + " - corrected");
})
);
});
The first transaction selects all Post entities and modifies the title properties.
However, before the first EntityManager is flushed, we are going to execute a second transition using the executeSync method.
The second transaction modifies the first Post, so its version is going to be incremented:
Query:[
UPDATE
post
SET
title = ?,
version = ?
WHERE
id = ? AND
version = ?
],
Params:[
('Post no. 1 - corrected', 1, 1, 0)
]
Now, when the first transaction tries to flush the EntityManager, we will get the OptimisticLockException:
Query:[
UPDATE
post
SET
title = ?,
version = ?
WHERE
id = ? AND
version = ?
],
Params:[
('Post no. 1 - 2nd edition', 1, 1, 0),
('Post no. 2 - 2nd edition', 1, 2, 0),
('Post no. 3 - 2nd edition', 1, 3, 0)
]
o.h.e.j.b.i.AbstractBatchImpl - HHH000010: On release of batch it still contained JDBC statements
o.h.e.j.b.i.BatchingBatch - HHH000315: Exception executing batch [
org.hibernate.StaleStateException:
Batch update returned unexpected row count from update [0];
actual row count: 0;
expected: 1;
statement executed:
PgPreparedStatement [
update post set title='Post no. 3 - 2nd edition', version=1 where id=3 and version=0
]
],
SQL: update post set title=?, version=? where id=? and version=?
So, you need to upgrade to Hibernate 5.4.1 or newer to benefit from this improvement.
This can happen when trigger(s) execute additional DML (data modification) queries which affect the row counts. My solution was to add the following at the top of my trigger:
SET NOCOUNT ON;
I was facing same issue.
The code was working in the testing environment. But it was not working in staging environment.
org.hibernate.jdbc.BatchedTooManyRowsAffectedException: Batch update returned unexpected row count from update [0]; actual row count: 3; expected: 1
The problem was the table had single entry for each primary key in testing DB table. But in staging DB there was multiple entry for same primary key. ( Problem is in staging DB the table didn't had any primary key constraints also there was multiple entry.)
So every time on update operation it gets failed. It tries to update single record and expect to get update count as 1. But since there was 3 records in the table for the same primary key, The result update count finds 3. Since expected update count and actual result update count didn't match, It throws exception and rolls back.
After the I removed all the records which have duplicate primary key and added primary key constraints. It is working fine.
Hibernate - Batch update returned unexpected row count from update: 0 actual row count: 0 expected: 1
actual row count: 0 // means no record found to update
update: 0 // means no record found so nothing update
expected: 1 // means expected at least 1 record with key in db table.
Here the problem is that the query trying to update a record for some key, But hibernate didn't find any record with the key.
It also can happen when you try to UPDATE a PRIMARY KEY.
My two cents.
Problem: With Spring Boot 2.7.1 the h2 database version has changed to v2.1.214 which may result into a thrown OptimisticLockException when using generated UUIDs for Id columns, see https://hibernate.atlassian.net/browse/HHH-15373.
Solution: Add columnDefinition="UUID" to the #Column annotation
E.g., with a primary key definition for an entity like this:
#Id
#GeneratedValue(generator = "UUID")
#GenericGenerator(name = "UUID", strategy = "org.hibernate.id.UUIDGenerator")
#Column(name = COLUMN_UUID, updatable = false, nullable = false)
UUID uUID;
Change the column annotation to:
#Column(name = COLUMN_UUID, updatable = false, nullable = false, columnDefinition="UUID")
As Julius says this happens when an update Occurs on an Object that has its children being deleted. (Probably because there was a need for an update for the whole Father Object and sometimes we prefer to delete the children and re -insert them on the Father (new , old doesnt matter )along with any other updates the father could have on any of its other plain fields)
So ...in order for this to work delete the children (within a Transaction) by calling childrenList.clear() (Dont loop through the children and delete each one with some childDAO.delete(childrenList.get(i).delete())) and setting
#OneToMany(cascade = CascadeType.XXX ,orphanRemoval=true) on the Side of the Father Object. Then update the father (fatherDAO.update(father)). (Repeat for every father object) The result is that children have their link to their father stripped off and then they are being removed as orphans by the framework.
I encountered this problem where we had one-many relationship.
In the hibernate hbm mapping file for master, for object with set type arrangement, added cascade="save-update" and it worked fine.
Without this, by default hibernate tries to update for a non-existent record and by doing so it inserts instead.
Another way to get this error is if you have a null item in a collection.
It happens when you try to delete an object and then you try to update the same object. Use this after delete:
session.clear();
i got the same problem and i verified this may occur because of Auto increment primary key. To solve this problem do not inset auto increment value with data set. Insert data without the primary key.
This happened to me too, because I had my id as Long, and I was receiving from the view the value 0, and when I tried to save in the database I got this error, then I fixed it by set the id to null.
This problem mainly occurs when we are trying to save or update the object which are already fetched into memory by a running session.
If you've fetched object from the session and you're trying to update in the database, then this exception may be thrown.
I used session.evict(); to remove the cache stored in hibernate first or if you don't wanna take risk of loosing data, better you make another object for storing the data temp.
try
{
if(!session.isOpen())
{
session=EmployeyDao.getSessionFactory().openSession();
}
tx=session.beginTransaction();
session.evict(e);
session.saveOrUpdate(e);
tx.commit();;
EmployeyDao.shutDown(session);
}
catch(HibernateException exc)
{
exc.printStackTrace();
tx.rollback();
}
I ran into this issue when I was manually beginning and committing transactions inside of method annotated as #Transactional. I fixed the problem by detecting if an active transaction already existed.
//Detect underlying transaction
if (session.getTransaction() != null && session.getTransaction().isActive()) {
myTransaction = session.getTransaction();
preExistingTransaction = true;
} else {
myTransaction = session.beginTransaction();
}
Then I allowed Spring to handle committing the transaction.
private void finishTransaction() {
if (!preExistingTransaction) {
try {
tx.commit();
} catch (HibernateException he) {
if (tx != null) {
tx.rollback();
}
log.error(he);
} finally {
if (newSessionOpened) {
SessionFactoryUtils.closeSession(session);
newSessionOpened = false;
maxResults = 0;
}
}
}
}
This happens when you declared the JSF Managed Bean as
#RequestScoped;
when you should declare as
#SessionScoped;
Regards;
I got this error when I tried to update an object with an id that did not exist in the database. The reason for my mistake was that I had manually assigned a property with the name 'id' to the client side JSON-representation of the object and then when deserializing the object on the server side this 'id' property would overwrite the instance variable (also called 'id') that Hibernate was supposed to generate. So be careful of naming collisions if you are using Hibernate to generate identifiers.
I also came across the same challenge. In my case I was updating an object which was not even existing, using hibernateTemplate.
Actually in my application I was getting a DB object to update. And while updating its values, I also updated its ID by mistake, and went ahead to update it and came across the said error.
I am using hibernateTemplate for CRUD operations.
After reading all answers did´t find anyone to talk about inverse atribute of hibernate.
In my my opinion you should also verify in your relationships mapping whether inverse key word is appropiately setted. Inverse keyword is created to defines which side is the owner to maintain the relationship. The procedure for updating and inserting varies cccording to this attribute.
Let's suppose we have two tables:
principal_table, middle_table
with a relationship of one to many. The hiberntate mapping classes are Principal and Middle respectively.
So the Principal class has a SET of Middle objects. The xml mapping file should be like following:
<hibernate-mapping>
<class name="path.to.class.Principal" table="principal_table" ...>
...
<set name="middleObjects" table="middle_table" inverse="true" fetch="select">
<key>
<column name="PRINCIPAL_ID" not-null="true" />
</key>
<one-to-many class="path.to.class.Middel" />
</set>
...
As inverse is set to ”true”, it means “Middle” class is the relationship owner, so Principal class will NOT UPDATE the relationship.
So the procedure for updating could be implemented like this:
session.beginTransaction();
Principal principal = new Principal();
principal.setSomething("1");
principal.setSomethingElse("2");
Middle middleObject = new Middle();
middleObject.setSomething("1");
middleObject.setPrincipal(principal);
principal.getMiddleObjects().add(middleObject);
session.saveOrUpdate(principal);
session.saveOrUpdate(middleObject); // NOTICE: you will need to save it manually
session.getTransaction().commit();
This worked for me, bu you can suggest some editions in order to improve the solution. That way we all will be learning.
In our case we finally found out the root cause of StaleStateException.
In fact we were deleting the row twice in a single hibernate session. Earlier we were using ojdbc6 lib, and this was ok in this version.
But when we upgraded to odjc7 or ojdbc8, deleting records twice was throwing exception. There was bug in our code where we were deleting twice, but that was not evident in ojdbc6.
We were able to reproduce with this piece of code:
Detail detail = getDetail(Long.valueOf(1396451));
session.delete(detail);
session.flush();
session.delete(detail);
session.flush();
On first flush hibernate goes and makes changes in database. During 2nd flush hibernate compares session's object with actual table's record, but could not find one, hence the exception.
I solved it. I found that there was no primary key for my Id column in table.
Once I created it solved for me. Also there was duplicate id found in table before which I deleted and solved it.
This thread is a bit old, however I thought I should drop my fix here in case it may help someone with same root cause.
I was migrating a Java Spring hibernate app. from Oracle to Postgre, along the migration process, I converted a trigger from Oracle to Postgre, the trigger was "on Before Insert" of a table and was setting a one of the columns value (of course the desired column was marked update=false insert=false in hibernate mapping to allow the trigger to set its value), and when inserting data from the application I got this error Hibernate - Batch update returned unexpected row count from update: 0 actual row count: 0 expected: 1
My mistake was that I was setting "Return NULL" at the end of the trigger function, so when the trigger set the column value and the control is back to hibernate for saving, the record was lost as I was returning null.
My fix was to change "Return NULL" to "RETURN NEW" in trigger, this will keep the record available after being altered by the trigger, simply this was what it means by "unexcepted row count for update: 0 expected 1"
This happened if you change something in data set using native sql query but persisted object for same data set is present in session cache.
Use session.evict(yourObject);
Hibernate caches objects from the session. If object is accessed and modified by more than 1 user then org.hibernate.StaleStateException may be be thrown. It may be solved with merge/refresh entity method before saving or using lock. More info: http://java-fp.blogspot.lt/2011/09/orghibernatestalestateexception-batch.html
One of the case
SessionFactory sf=new Configuration().configure().buildSessionFactory();
Session session=sf.openSession();
UserDetails user=new UserDetails();
session.beginTransaction();
user.setUserName("update user agian");
user.setUserId(12);
session.saveOrUpdate(user);
session.getTransaction().commit();
System.out.println("user::"+user.getUserName());
sf.close();
I was facing this exception, and hibernate was working well. I tried to insert manually one record using pgAdmin, here the issue became clear. SQL insert query returns 0 insert. and there is a trigger function that cause this issue because it returns null. so I have only to set it to return new.
and finally I solved the problem.
hope that helps any body.