Configuring Hibernate for HQL

I am getting the following error to the simplest query:

org.hibernate.hql.internal.ast.QuerySyntaxException: <table_name> is not mapped [<query_string>]

In hibernate.cfg.xml I have the property;

<property name="current_session_context_class">org.hibernate.context.internal.ThreadLocalSessionContext</property>

ThreadLocalSessionContext is in org.hibernate.context.internal of Hibernate 4.x-hibernate-core-4.2.6.Final.jar.

Everything else on Hibernate is working fine. However, i'm not being able to run a query.

What am i missing?

Thanks for help.

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EDIT:

<table_name> is defined as an entity in hibernate.cfg.xml and everything but HQL-- including the updates on <table_name> are working with no errors.

Solution

There are two possibilities which comes to my mind

The name you are referring in your HQL is not an Entity. For e.g.,

HQL is "Select testEntity from TestEntity testEntity" , however there is no entity class named TestEntity defined

You have defined TestEntity but it is not managed. You say that other operation in entity are working, it looks like you are probably using wrong name in your HQL. However if you want to be sure that the Entity is managed, you can enable the Hibernate debug logging and you should see information like below in which you can see the list of managed classes.

01:09:40,322 DEBUG HibernatePersistenceProvider:110 - Checking persistence-unit [name=persistence-unit_test, explicit-provider=org.hibernate.ejb.HibernatePersistence] against incoming persistence unit name [persistence-unit_demo]
01:09:40,322 DEBUG ProviderChecker:106 - Persistence-unit [persistence-unit_demo] requested PersistenceProvider [org.hibernate.ejb.HibernatePersistence]
01:09:40,322 DEBUG LogHelper:117 - PersistenceUnitInfo [
    name: persistence-unit_demo
    persistence provider classname: org.hibernate.ejb.HibernatePersistence
    classloader: null
    excludeUnlistedClasses: false
    JTA datasource: null
    Non JTA datasource: null
    Transaction type: RESOURCE_LOCAL
    PU root URL: file:/E:/Test/target/classes/
    Shared Cache Mode: null
    Validation Mode: null
    Jar files URLs []
    Managed classes names [
        com.test.model.TestEntity

    Mapping files names []
    Properties [
        hibernate.c3p0.timeout: 100
        hibernate.connection.autocommit: false
        hibernate.connection.driver_class: com.mysql.jdbc.Driver
        hibernate.c3p0.max_statements: 0
        hibernate.c3p0.max_size: 50
        hibernate.dialect: org.hibernate.dialect.MySQL5InnoDBDialect
        hibernate.c3p0.idle_test_period: 100
        hibernate.c3p0.min_size: 5
        hibernate.connection.username: XXXX
        hibernate.hbm2ddl.auto: update
        hibernate.c3p0.acquire_increment: 5
        hibernate.connection.url: jdbc:mysql://localhost:3306/test
        hibernate.connection.password: XXXX
        hibernate.show_sql: true
        hibernate.connection.provider_class: org.hibernate.connection.C3P0ConnectionProvider]
01:09:40,337 DEBUG IntegratorServiceImpl:63 - Adding Integrator [org.hibernate.cfg.beanvalidation.BeanValidationIntegrator].
01:09:40,353 DEBUG IntegratorServiceImpl:63 - Adding Integrator [org.hibernate.secure.spi.JaccIntegrator].