org.hibernate.boot.MappingNotFoundException: Mapping (RESOURCE) not found

Question

I have been trying my hand to implement hibernate using a small example.

Below is my hibernate.config.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/abc
</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="show_sql">true</property>
<mapping
resource="HibernateExample/src/HibernateExposed/Resource/Person.hbm.xml"/>
</session-factory>
</hibernate-configuration>

When running the code I am getting error org.hibernate.boot.MappingNotFoundException: Mapping (RESOURCE) not found.

I tried replacing mapping as below

<mapping
resource="Resource/Person.hbm.xml"/>

and also tried to keep the mapping xml at same location as hibernate.config.xml.

<mapping
resource="Person.hbm.xml"/>

Under none of above mentioned cases, code can find my Person.hbm.xml.

My folder structure looks as below

I looked at all other answers for this error on Stackoverflow but none of the approaches resolved this issue. Any help is highly appreciated. Also, is there any approach to debug this further to granular level?

Answer 1

Please, put hibernate.cfg.xml in the root of src folder.

And use

<mapping resource="HibernateExposed/Person.hbm.xml"/>

Hibernate loads all those files using ClassLoader.getResourceAsStream(resourcePath) resourcePath — is the path to the file

ClassLoader tries to get access to the files in the root of bin or build folder in the IDE, or root of jar, or root of war/WEB-INF/classes/ for web-applications. Those all are the root of the class path.

bin is a folder where Eclipse compiles your files. The root of src folder is compiled to the root of bin folder. You can check it.

For an example

configure("hibernate.cfg.xml") — bin/hibernate.cfg.xml configure("xxx/hibernate.cfg.xml") — bin/xxx/hibernate.cfg.xml

 <mapping resource="HibernateExposed/Person.hbm.xml"/>

corresponds bin/HibernateExposed/Person.hbm.xml

A path should be without the leading / for a ClassLoader. Hibernate tries to delete the leading /.

A path like this is valid too

<mapping resource="/HibernateExposed/Person.hbm.xml"/>

Update

You can specify path to the hibernate.cfg.xml, if you don't want to have it in the root

new Configuration().configure("HibernateExposed/hibernate.cfg.xml")

if you use

new Configuration().configure()

it should be in the root of the class path.