Jagadeesh VP reduce. reuse.. recycle...
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In hibernate this error is common.

Caused by: java.lang.ClassNotFoundException: org.slf4j.impl.StaticLoggerBinder
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)

The hibernate distribution package have slf4j-api-x.x.x.jar file which does not have the impl package.

To avoid this error download slf4j-x.x.x.zip / .gz package from http://slf4j.org/download.html.

In this package you will find slf4j-simple-x.x.x.jar which has this org.slf4j.impl package. Add this jar in your classpath and run your application.

package com.vpj;

import java.util.Set;
import com.vpj.Boo;

public class Foo {
   private String fooId;
   private Storing name;
  
   private Set<Boo> boo;
 
   /* Getters & Setters */
}

package com.vpj;

import java.util.Set;
import com.vpj.Foo;

public class Boo {
   private String booId;
   private String name;

   private Set<Foo> foo;

   /* Getters & Setters */
}

.hbm.xml :

...
<class type="com.vpj.Foo">
 <id name="id" column="id">
  <genetator class="increment" />
 </id>
 
 <property name="name" type="string" column="name" />
 
 <set name="boo" table="Foo_Boo">
  <key column="fooId" />
  <many-to-many column="booId" class="Boo" />
 </set>
</class>

<class type="com.vpj.Boo">
 <id name="id" column="id">
  <generator class="increment" />
 </id>

 <property name="name" type="string" column="name" />
 
 <set name="foo" table="Foo_Boo">
  <key column="booId" />
  <many-to-many column="fooId" class="Foo" />
 </set>
</class>
...