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How to get only parent without children in Hibernate and without lazy exception?

How to get only parent without children in Hibernate and without lazy exception, when you trying to access chidlren filed after closing session?
I mean, a kind of pure parent obtainingm but I beed to be sure, that somebody will not obtain them with getter or will not catch a lazy exception.
<class name="com.electronic.commerce.models.Category" table="Category">
<id name="id" type="long" access="property">
<column name="categoryId" length="20"/>
<generator class="native"/>
</id>
<property name="name" column="categoryName" type="string"/>
<property name="parentId" column="categoryParentId" type="long"/>
<bag name="children" table="Category" inverse="true" lazy="true" fetch="select">
<key>
<column name="categoryParentId" not-null="true"/>
</key>
<one-to-many class="com.electronic.commerce.models.Category"/>
</bag>
</class>

Mixed solution
Xml:
<prop key="hibernate.enable_lazy_load_no_trans">false</prop>
Java:
DefaultTransactionDefinition defaultTransactionDefinition = new DefaultTransactionDefinition();
defaultTransactionDefinition.setPropagationBehavior(transactionDefinition);
transactionManager.getTransaction(defaultTransactionDefinition);

Fetching data only for specified mapping in HQL query

I have following hbm.xml file
<hibernate-mapping>
<class catalog="test_user" name="test.user" table="user">
<id name="id" type="java.lang.Long">
<column name="id"/>
<generator class="identity"/>
</id>
<property name="name" type="string">
<column length="200" name="name" unique="true"/>
</property>
<set fetch="join" inverse="true" lazy="true" name="education" table="user_education">
<key>
<column name="aid"/>
</key>
<one-to-many class="test.UserEducation"/>
</set>
<set fetch="join" inverse="true" lazy="true" name="employment" table="user_employment">
<key>
<column name="aid"/>
</key>
<one-to-many class="test.UserEmployment"/>
</set>
<set fetch="join" inverse="true" lazy="false" name="otherProfiles" table="user_other_profile">
<key>
<column name="aid"/>
</key>
<one-to-many class="test.OtherProfile"/>
</set>
<set fetch="join" inverse="true" lazy="false" name="settings" table="user_setting">
<key>
<column name="aid"/>
</key>
<one-to-many class="test.Setting"/>
</set>
<set fetch="join" inverse="true" lazy="false" name="images" table="user_images">
<key>
<column name="aid"/>
</key>
<one-to-many class="test.Images"/>
</set>
..
..
...
and many tables associate with user here I am using fetch="join"
for maximum tables.
In other queries I have to fetch data from few other related tables so I made
fetch="join".
I want to execute quest
from user as u
left join fetch u.settings
where u.id=25
My problem is when I want to fetch data from user it always fetch data from all associated table where fetch="join".
I want to know how to fetch only related join data. For above query only data from user and settings data should be fetched not from other tables when we have specified fetch="join" for multiple tables.

You should not use fetch="join" because EAGER fetching can lead to Cartesian Products and it's not very efficient.
You need to set those associations to lazy="true" and only fetch themon a query basis:
from user as u
left join fetch u.settings
where u.id=25
This way, you will only fetch Users along with their settings and without join fetching the other associations.

Hibernate org.hibernate.MappingException... an associon ..to unmapped class- Many toMany

I have auto generated the code using netbeans to create a Hibernate configuration; so I have two tables mapped like this (Many-to-Many) :
<hibernate-mapping auto-import="true">
<class name="com.antoiovi.jobprograms.entity.Roles" table="roles" catalog="jobprograms">
<id name="rolesName" type="string">
<column name="roles_name" length="20" />
<generator class="assigned" />
</id>
<set name="userses" table="users_roles" inverse="true" lazy="false" fetch="select" cascade="all">
<key>
<column name="role_name" length="20" not-null="true" />
</key>
<many-to-many entity-name="com.antoiovi.jobprograms.entity.Users">
<column name="user_name" length="15" not-null="true" />
</many-to-many>
</set>
</class>
<hibernate-mapping auto-import="true">
<class name="com.antoiovi.jobprograms.entity.Users" table="users" catalog="jobprograms">
<id name="idusers" type="java.lang.Integer">
<column name="idusers" />
<generator class="identity" />
</id>
<property name="userName" type="string">
<column name="user_name" length="15" not-null="true" unique="true" />
</property>
<property name="userPass" type="string">
<column name="user_pass" length="15" not-null="true" />
</property>
<property name="firstName" type="string">
<column name="first_name" length="20" />
</property>
<property name="lastName" type="string">
<column name="last_name" length="25" />
</property>
<set name="roleses" table="users_roles" inverse="true" lazy="false" fetch="select" cascade="all">
<key>
<column name="user_name" length="15" not-null="true" />
</key>
<many-to-many entity-name="com.antoiovi.jobprograms.entity.Roles">
<column name="role_name" length="20" not-null="true" />
</many-to-many>
</set>
<set name="jobprograms" table="jobprogram" inverse="true" lazy="false" fetch="select" cascade="all">
<key>
<column name="users_idusers" not-null="true" />
</key>
<one-to-many class="com.antoiovi.jobprograms.entity.Jobprogram" />
</set>
</class>
I have made some modification as you can see above (auto-import=true, lazy=false), cause i have the error message
rg.hibernate.MappingException: An association from the table users_roles refers to an unmapped class: com.antoiovi.jobprograms.entity.Roles
at org.hibernate.cfg.Configuration.secondPassCompileForeignKeys(Configuration.java:1824)
at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1756)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1423)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1856)
The config file is
<hibernate-configuration>
org.hibernate.dialect.MySQLDialect
com.mysql.jdbc.Driver
jdbc:mysql://localhost:3306/jobprograms?zeroDateTimeBehavior=convertToNull
jobprograms_ad
xxxxx
thread
true
org.hibernate.hql.classic.ClassicQueryTranslatorFactory
true
the classes have refernce like this :
'#ManyToMany(fetch=FetchType.LAZY, mappedBy="roleses")
public Set<Users> getUserses() {
return this.userses;
} '
#ManyToMany(fetch=FetchType.EAGER)
#JoinTable(name="users_roles", catalog="jobprograms", joinColumns = {
#JoinColumn(name="user_name", nullable=false, updatable=false) }, inverseJoinColumns = {
#JoinColumn(name="role_name", nullable=false, updatable=false) })
public Set<Roles> getRoleses() {
return this.roleses;
}
wHEN RUNNING I HAVE THE ERROR org.hibernate.exception.SQLGrammarException, and in fact the entiti is loaded, but the set<> not..,
When testing the error is
org.hibernate.MappingException: An association from the table users_roles refers to an unmapped class: com.antoiovi.jobprograms.entity.Roles, and the HSQL ar not executed.
I tried to look in others post but i couldn't find an answer. Can anybody help me?
In config file the entities are all declared;
I think yhe promlem is in the mapping :
e <set name="roleses" table="users_roles" inverse="false" lazy="true" fetch="select" >
<key >
<column name="user_name" length="15" not-null="true" />
</key>
<many-to-many entity-name="test.Roles" property-ref="rolesName">
<column name="role_name" length="20" not-null="true" />
</many-to-many>
</set>
<set name="jobprograms" table="jobprogram" inverse="true" lazy="true" fetch="select">
<key>
<column name="users_idusers" not-null="true" />
</key>
<one-to-many class="test.Jobprogram" />
</set>
and
enter <class name="test.Roles" table="roles" catalog="jobprograms">
<id name="rolesName" type="string">
<column name="roles_name" length="20" />
<generator class="assigned" />
</id>
<set name="userses" table="users_roles" inverse="true" lazy="true" fetch="select">
<key property-ref="rolesName">
<column name="role_name" length="20" not-null="true" />
</key>
<many-to-many entity-name="test.Users" property-ref="userName">
<column name="user_name" length="15" not-null="true" />
</many-to-many>
</set>
</class>
....

this error
org.hibernate.MappingException: An association from the table users_roles refers to an unmapped class: com.antoiovi.jobprograms.entity.Roles
comes when hibernate configuration dont know about entity(Roles) mapping , either you have missed introducing enitity Roles to the hibernate configuration or you have not used correct name , please check configuraiton file and included com.antoiovi.jobprograms.entity.Roles as resourse

I think to have resolved the problem. Actually the proble are unmapped entities. But this happens because the database is not 'well formed'. Indeed the database ha 3 table users, users_roles, roles; the table roles has only one column as primarykey (varchar),and the table user_roles refers to it from its column user_roles; when forword enginering the ide (in the case netbeans) creates only 2 entities: 'Users', and 'Roles'; So i have re-designed the schema putting some virtual primary key, and creating unique constaint instead. Now i have 3 entities : Users,UserRoles, and Roles.

Hibernate: Mapping with one-to-many on non-primary-key columns

I'm stuck at the hibernate xml mapping configuration.
I've established some tables with foreign key constraints in my MSSQL database:
Table ItemsBase
ID int primary-key
ItemID int unique index
... some more columns
Table Others
ID int primary-key
ItemID int unique index
... some more columns
The foreign key constraint is configured to connect these two tables by using the column "ItemID".
My ItemsBase.hbm.xml files looks like:
<hibernate-mapping>
<class name="de.delife.sql.ItemsBase" table="ItemsBase" schema="dbo" catalog="Delife_Plenty">
<id name="id" type="int">
<column name="ID" />
<generator class="assigned" />
</id>
<property name="itemId" type="java.lang.Integer">
<column name="ItemID" unique="true" />
</property>
<set name="otherses" table="Others" inverse="true" lazy="true" fetch="select">
<key property-ref="itemId">
<column name="ItemID" />
</key>
<one-to-many class="de.delife.sql.Others" not-found="ignore" />
</set>
</class>
</hibernate-mapping>
and the Others.hbm.xml files looks like:
<hibernate-mapping>
<class name="de.delife.sql.Others" table="Others" schema="dbo" catalog="Delife_Plenty">
<id name="id" type="int">
<column name="ID" />
<generator class="assigned" />
</id>
<many-to-one name="itemsBase" class="de.delife.sql.ItemsBase" fetch="select" property-ref="itemId">
<column name="ItemID" unique="true" />
</many-to-one>
</class>
</hibernate-mapping>
Everything looks fine for me, but when I run my program I get a hibernate error:
property [itemId] not found on entity [de.delife.sql.Others]
I have an established relation between ItemsBase and a table named ItemsProperties and it works, but with this "pretty" table "Others" I'm stuck.
I would be glad, if someone can help me on this matter. Thx in advance.

Try like this. I tried and its working for me.
<set name="otherses" table="Others" inverse="true" lazy="true" fetch="select">
<key column="itemId" foreign-key="itemId" property-ref="itemId"/>
<one-to-many class="de.delife.sql.Others" not-found="ignore" />
</set>

Item id should be defined as a property in Others.hbm.xml:
<property name="itemId" column="ItemId"/>

org.hibernate.exception.MappingException or ConstraintViolation

I am using hibernate 4.1.9. I have Users, and the Users have a list of Accounts, and Accounts have list of Transactions. Here is my hbm.xml
<?xml version="1.0"?>
<class name="User" table="users">
<id name="userId" column="userid">
<generator class="increment"/>
</id>
<property name="username" column="username" not-null="true"/>
<property name="password" column="password" not-null="true"/>
<property name="registerDate" type="timestamp" column="register_date"/>
<list name="accounts" table="accounts" inverse="true" cascade="all">
<key column="userid" not-null="true"/>
<index column="accountid"/>
<one-to-many class="com.joe.data.Account"/>
</list>
</class>
<class name="Account" table="accounts">
<id name="accountId" column="accountid">
<generator class="increment"/>
</id>
<property name="balance" type="big_decimal" column="balance"/>
<property name="lastModified" type="timestamp" column="last_modified"/>
<list name="txns" table="transactions" inverse="true" cascade="all">
<key column="accountId" not-null="true"/>
<index column="transactionId"/>
<one-to-many class="com.joe.data.Transaction"/>
</list>
<many-to-one name="userId" class="User" column="userid" not-null="true"
unique="true" cascade="all"/>
<many-to-one name="accountType" class="AccountType" column="account_type"
not-null="true" cascade="all" unique="true" />
</class>
<class name="Transaction" table="transactions">
<id name="transactionId" column="transactionid">
<generator class="increment"/>
</id>
<property name="description" column="description"/>
<property name="amount" type="big_decimal" column="amount"/>
<property name="dateAdded" column="date_added"/>
<property name="reoccuring" type="numeric_boolean" column="reoccuring"/>
<many-to-one name="category" class="Category" column="category"
not-null="true" cascade="all" unique="true" />
</class>
<class name="Category" table="categories">
<id name="categoryId" column="categoryid"/>
<property name="categoryName" column="categoryname" not-null="true"/>
</class>
<class name="AccountType" table="account_types">
<id name="accountType" column="account_type"/>
<property name="accountName" column="name"/>
</class>
If I leave inverse="true" on the list of accounts (in the User) I get the ConstraintViolationException because the userid is not getting put in the insert query. If I take inverse="true" off of the list of accounts, I get org.hibernate.MappingException: Repeated column in mapping for entity: com.joe.data.Account column: accountid (should be mapped with insert="false" update="false")
To clarify lowercase names are database columns names, camel case are class variable names. I know Transaction class isn't working quite right yet, but if I could get the Accounts to insert I could do the same thing to get the Transactions to insert.
Edit: I added the many-to-one on the Account class and now I am getting another exception where hibernate is complaining about missing a getter for userId in com.joe.data.Account

In order to get inverse="true" work, you need to define many-to-one for User in Account and for Account in Transaction class and mappings.