don't flush the Session after an exception occurs

jiangzubing · **Joined:** Thu Apr 03, 2008 11:12 pm **Posts:** 3

Code:

null id in com.blog.domain.Comment entry (don't flush the Session after an exception occurs)

hi

I need your help.thanks.

I have a application in remote server.
some time,my website happened an exception as following:

Code:

null id in com.blog.domain.Comment entry (don't flush the Session after an exception occurs)

I don't know how to resolve it.

my mapping config file:

Code:

 <class name="com.blog.domain.Comment" table="comment" catalog="jiangzubing">
        <id name="id" type="java.lang.Integer">
            <column name="Id" />
            <generator class="native" />
        </id>
        <property name="articleid" type="java.lang.String">
            <column name="articleid" length="20" not-null="true" />
        </property>
        <property name="articletitle" type="java.lang.String">
            <column name="articletitle" length="100" not-null="true" />
        </property>
        <property name="content" type="java.lang.String">
            <column name="content" length="2000" not-null="true" />
        </property>
        <property name="user" type="java.lang.String">
            <column name="user" length="20" not-null="true" />
        </property>
        <property name="time" type="java.lang.String">
            <column name="time" length="20" not-null="true" />
        </property>
        <property name="isdelete" type="java.lang.Integer">
            <column name="isdelete" not-null="true" />
        </property>
    </class>

I used mysql database.and I never operation ID.
can you help me ?

if you understand my meaning and have a good idea,pls send it to

me.ok?thanks a lot.

my email address:jiangzubing@yahoo.cn

MSN:xiaoliu52013@163.com
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Sukirtha · **Posted:** Fri Apr 04, 2008 6:10 am

Can you post your complete stack trace and the java code that does the save operation?

jiangzubing · **Joined:** Thu Apr 03, 2008 11:12 pm **Posts:** 3

hi
First.thanks your reply.
in fact,in my source are very simple.
I use session.save() or update().
only this.

by the way,in my log file I found:

[2008-04-04 10:14:29,187 TP-Processor3 AssertionFailure.java org.hibernate.AssertionFailure.<init>(AssertionFailure.java:22) ERROR - an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session)org.hibernate.AssertionFailure: null id in com.blog.domain.Comment entry (don't flush the Session after an exception occurs) at org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:48)[/code]

jiangzubing · **Joined:** Thu Apr 03, 2008 11:12 pm **Posts:** 3

Who can help me?
thanks!

Nandem · **Posted:** Mon Apr 07, 2008 8:26 am

the key column from your table is autoincrement ?
if true, try use generator class="identity" on id tag!

cya, good luck!

brettcave · **Joined:** Wed Mar 03, 2010 6:28 am **Posts:** 4

I have the same problem, but (strange to me) is that the problem only started occuring after changing our data source from local-tx to xa.

Using hibernate entity manager, I have the following

Code:

@Stateful
public class MyStatefulBean implements MyStateful {

  @In
  private User user;

  @EJB
  private LoggerBean loggerBean;
  
  public void eventOccurred() {
     if (user == null) { return; }
     loggerBean.log(new MyEntity(user.getUserId(), "Description"));
  }
}

The LoggerBean is stateless and has a log method that persists the entity (as initialized above) with entityManager.persist(theEntity)

The entity MyEntity has an Integer @Id with @GeneratedValue(strategy = GenerationType.IDENTITY) and the database uses an auto increment on the field, and a userId which is not nullable.

The exception is thrown because the userId is null at the time of the persist call.

Any ideas why this occurs when using an xa datasource?

KevinHubilla · **Joined:** Thu Jun 24, 2010 4:11 am **Posts:** 1

It happened in my application where there is a duplicate key.
Check first the constraints before saving

EDIT
There are instances that the user (or yourself) clicked the button (that triggers the insert/update) twice. Also check on that part

larryp7639 · **Joined:** Thu Jun 24, 2010 5:35 am **Posts:** 1

brettcave wrote:

I have the same problem, but (strange to me) is that the problem only started occuring after changing our data source from local-tx to xa.

Using hibernate entity manager, I have the following

Code:

@Stateful
public class MyStatefulBean implements MyStateful {

  @In
  private User user;

  @EJB
  private LoggerBean loggerBean;
  
  public void eventOccurred() {
     if (user == null) { return; }
     loggerBean.log(new MyEntity(user.getUserId(), "Description"));
  }
}

The LoggerBean is stateless and has a log method that persists the entity (as initialized above) with entityManager.persist(theEntity)

The entity MyEntity has an Integer @Id with @GeneratedValue(strategy = GenerationType.IDENTITY) and the database uses an auto increment on the field, and a userId which is not nullable.

The exception is thrown because the userId is null at the time of the persist call.

Any ideas why this occurs when using an xa datasource?

Thanks you for the post.

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