Initially, I had my hibernate.cfg.xml file in the following directory

my-app/src/main/java

And when I first tried to run my hibernate unit tests (mvn test), I got this error:

SessionFactory creation failed.org.hibernate.HibernateException: /hibernate.cfg.xml not found

Some checking of the maven docs and some forums revealed the following possible solutions:
1) Copy the hibernate.cfg.xml file to

my-app/target/classes

This works, however I think it is a hack as the target folder is generated rather than being somewhere you should actually manually create files.
2) The next solution I found suggested moving the hibernate.cfg.xml to

my-app/src/main/resources

This works well as the contents of this folder are copied to the base level of the my-app/target/classes folder so it is basically a ‘more correct’ solution than the first.
3) The next and I think best solution was to create a new, duplicate hibernate.cfg.xml inside

my-app/src/test/resources

This allows a different hibernate.cfg.xml file to be used for testing and, for example, facilitates connecting to a different database (such as hsqldb) for testing while continuing to use your regular database (such as MySQL) for the app itself.

A couple of points to note:

1) The hibernate mapping files (i.e. the *.hbm.xml files) should also be in the resources folder (in whatever directory structure you choose) to ensure that these too are accessible by the unit tests.

2) I am not (yet) using Spring with the hibernate components, which would likely have changed the above setup.

Refs/links

http://maven.apache.org/guides/getting-started/index.html#How_do_I_add_resources_to_my_JAR

http://www.mail-archive.com/users@maven.apache.org/msg54720.html

I ran into some problems persisting my classes that use Money via Hibernate. I should point out that these are not problems with the Money class or the timeandmoney library, rather than with my hibernate setup, but I thought I would post my approach here for future reference.

I started by incorrectly trying to map my Money field (in my case, called ‘openingBalance) as a property, viz:

<property name=”openingBalance” type=”com.domainlanguage.money.Money”>

Which resulted in the following error:

SEVERE: Data truncation: Data too long for column ‘openingBalance’ at row 1
Exception in thread “main” org.hibernate.exception.GenericJDBCException: could not insert…

Then I tried mapping it as a component, viz

<component name=”openingBalance” class=”com.domainlanguage.money.Money”>

<property name=”amount”/>

<property name=”currency”/>

</component>

But this resulted in the following error:

Initial SessionFactory creation failed.org.hibernate.PropertyNotFoundException: Could not find a setter for property amount in class com.domainlanguage.money.Money
Exception in thread “main” java.lang.ExceptionInInitializerError

This is because the Money class has no setAmount or setCurrency methods. The solution is to specify field access (as opposed to accessor method access), as in

<component name=”openingBalance” class=”com.domainlanguage.money.Money”>

<property access=”field” name=”amount”/>

<property access=”field” name=”currency”/>

</component>

Note that if you check the Money javadocs, it (correctly) says that the setters are not provided because they would break encapsulation They do however (and I quote, “begrudgingly”) provide alternative setters such as setForPersistentMapping_Amount, but I am not sure how to get Hibernate to use these, and in this case, I don’t think it is necessary or beneficial anyway.