Hi,
I was trying to use caching in hibernate but I got this error.

Exception in thread "main" java.lang.NullPointerException
at net.sf.ehcache.config.Configuration$DefaultCache.access$100(Configuration.java:308)
at net.sf.ehcache.config.Configuration.getDefaultCache(Configuration.java:129)
at net.sf.ehcache.CacheManager.configure(CacheManager.java:159)
at net.sf.ehcache.CacheManager.<init>(CacheManager.java:128)
at net.sf.ehcache.CacheManager.create(CacheManager.java:180)
at net.sf.ehcache.CacheManager.getInstance(CacheManager.java:196)
at net.sf.ehcache.hibernate.Plugin.<init>(Plugin.java:92)
at net.sf.ehcache.hibernate.Provider.buildCache(Provider.java:89)
at net.sf.hibernate.cfg.Configuration.configureCaches(Configuration.java:1135)
at net.sf.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:795)
at hibernate2package.Main.main(Main.java:190)

Could anyone please help me in that.

Thanks in Advance.

Hibernate version:
2.1
Mapping documents:
Customer:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping package="hibernate2package">
<class name = "Customer" table ="customer">
<cache usage="read-write" />

<id name="cid" column ="cid">
<generator class ="native"/>
</id>
<property name="cname" column="name"/>
<property name="caddress" column="address"/>
<property name="ctel" column="tel"/>

<bag name="products" table="customerproduct" lazy="true" cascade="save-update">
<cache usage="read-write" />
<key column= "custid"/>
<many-to-many class="Product" column="prodid"/>
</bag>
</class>
</hibernate-mapping>

Product:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping package="hibernate2package">

<class name="Product" table="product">
<cache usage="read-write" />

<id name = "pid" column ="pid">
<generator class="native"/>
</id>
<property name= "pname" column="name"/>
<property name="pdescription" column="description"/>

<bag name="customers" table ="customerproduct" lazy="true" inverse="true" cascade="save-update">
<cache usage="read-write" />
<key column= "prodid"/>
<many-to-many class="Product" column="custid"/>
</bag>
<many-to-one name="vendor" column="vid" class="Vendor"/>

</class>

</hibernate-mapping>

Vendor:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping package="hibernate2package">
<class name="Vendor" table="vendor">
<id name="vid" column="vid">
<generator class="native"/>
</id>
<property name="vname" column="name"/>
<property name="vaddress" column="address"/>
<property name="vtel" column="tel"/>
<bag name="products" inverse="true" lazy ="true" cascade="all-delete-orphan">
<key column="vid"/>
<one-to-many class="Product"/>
</bag>
</class>
</hibernate-mapping>

ehcahe.xml:
<?xml version="1.0" encoding="UTF-8"?>
<ehcache>
<cache name="hibernate2package.Customer"
maxElementsInMemory="500"
eternal="true"
timeToIdleSeconds="0"
timeToLiveSeconds="0"
overflowToDisk="false"
/>

<cache name="hibernate2package.Customer.products"
maxElementsInMemory="500"
eternal="true"
timeToIdleSeconds="0"
timeToLiveSeconds="0"
overflowToDisk="false"
/>

<cache name="hibernate2package.Product"
maxElementsInMemory="500"
eternal="true"
timeToIdleSeconds="0"
timeToLiveSeconds="0"
overflowToDisk="false"
/>

<cache name="hibernate2package.Product.customers"
maxElementsInMemory="500"
eternal="true"
timeToIdleSeconds="0"
timeToLiveSeconds="0"
overflowToDisk="false"
/>

</ehcache>

hibernate.properties:
hibernate.dialect net.sf.hibernate.dialect.MySQLDialect
hibernate.connection.driver_class org.gjt.mm.mysql.Driver
hibernate.connection.driver_class com.mysql.jdbc.Driver
hibernate.connection.url jdbc:mysql:///mydb2
hibernate.connection.username root
hibernate.connection.password
hibernate.cache.provider_class net.sf.ehcache.hibernate.Provider
hibernate.cache.use_query_cache true



Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:

Name and version of the database you are using:
mysql

The generated SQL (show_sql=true):

Debug level Hibernate log excerpt:

update to the latest release of hibernate. there is a fixed version of ehcache with it.