null pointer exception hibernate on creating sessionfactory

Question

Hi i trying to write my first Hibernate program, its giving an error while instantiating the session factory. I'm using hibernate 5.0.4 & java 8 & eclipse Luna SR1 (4.4.1) & oracle 11g.

MainClass is:

public class MainMethod {
public static void main(String[] args) {
    SampleClass s = new SampleClass();
    s.setId(1);
    s.setValue("Value_1");

    SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();

    Session session = sessionFactory.openSession();
    session.beginTransaction();
    session.save(s);
    session.getTransaction().commit();      
}
}

the hibernate.cfg.xml is

<?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="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
  <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:mndb11g</property>
  <property name="hibernate.connection.username">temp_p</property>
  <property name="hibernate.connection.password">temp_p</property>
  <property name="connection.pool_size">1</property>

  <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
  <property name="hibernate.default_schema">temp_p</property>

  <property name="hbm2ddl.auto">create</property>
  <property name="show_sql">true</property>

  <mapping class="com.h.SampleClass.SampleClass"/>

</session-factory>
</hibernate-configuration>

Its giving an exception at

SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();

The exception stack trace is

    Exception in thread "main" java.lang.NullPointerException
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl$AggregatedClassLoader.getResources(ClassLoaderServiceImpl.java:173)
    at java.util.ServiceLoader$LazyIterator.hasNextService(ServiceLoader.java:348)
    at java.util.ServiceLoader$LazyIterator.hasNext(ServiceLoader.java:393)
    at java.util.ServiceLoader$1.hasNext(ServiceLoader.java:474)
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.loadJavaServices(ClassLoaderServiceImpl.java:324)
    at org.hibernate.integrator.internal.IntegratorServiceImpl.<init>(IntegratorServiceImpl.java:40)
    at org.hibernate.boot.registry.BootstrapServiceRegistryBuilder.build(BootstrapServiceRegistryBuilder.java:213)
    at org.hibernate.cfg.Configuration.<init>(Configuration.java:119)
    at com.h.MainMethod.main(MainMethod.java:19)

Can anyone please help to solve this. Thanks in advance.

tharindu_DG · Accepted Answer · 2015-11-26 09:16:13Z

2

This could happen due to several reasons.

May be the Entity cannot be found. In your hibernate.cfg.xml file the entity is mentioned as com.h.SampleClass.SampleClass Please double check the class name and the package name.
Make sure that the hibernate libraries are added as user libraries. Not system libraries. More info

Hope this helps.

answered Nov 26, 2015 at 9:16

tharindu_DG

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2 Comments

anji_rajesh Over a year ago

yes my package is com.h.SampleClass & my class is SampleClass. & but i've added them as system libraries.. changed to user libraries. Working perfect. thanks :)

user3252885 Over a year ago

This works for me. I created a standalone java project and try to import Hibernate libraries as user libraries but selected 'System libraries' checkbox. Error disappeared after unchecking the 'System libraries' checkbox

Josh Chappelle · Accepted Answer · 2015-11-26 03:21:42Z

0

It sounds like hibernate.cfg.xml is not on your classpath when the code runs. If you are using maven put it in src/main/resources.

answered Nov 26, 2015 at 3:21

Josh Chappelle

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