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POWhat is a IncompatibleClassChangeError exception in Java?
 

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  1. POWhat is a IncompatibleClassChangeError exception in Java?
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    <p>i am working on a small application and I am trying to use Hibernate Annotations to map my entities. I wanted to test if everything is alright when i got this exception : </p> <pre><code> Exception in thread "main" java.lang.ExceptionInInitializerError at fr.cc2i.intervention.dao.main.Main$HibernateUtil.&lt;clinit&gt;(Main.java:48) at fr.cc2i.intervention.dao.main.Main.test(Main.java:21) at fr.cc2i.intervention.dao.main.Main.main(Main.java:32) Caused by: java.lang.IncompatibleClassChangeError: Implementing class at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632) at java.lang.ClassLoader.defineClass(ClassLoader.java:616) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) at fr.cc2i.intervention.dao.main.Main$HibernateUtil.&lt;clinit&gt;(Main.java:44) ... 2 more </code></pre> <p>Can someone explain what is this exception ? This is the first time i see it. Here is the main of my application : </p> <pre><code> package fr.cc2i.intervention.dao.main; import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.AnnotationConfiguration; import fr.cc2i.intervention.dao.beans.Client; import fr.cc2i.intervention.dao.beans.Contrat; public class Main { public static void test(){ Client c = new Client(); c.setCode("123343"); c.setAdresse("fkhdhdmh"); c.setNom("dgsfhgsdfgs"); c.setPhone("53456464"); c.setContrat(new Contrat()); Session session = HibernateUtil.getSession(); session.beginTransaction(); session.save(c); session.getTransaction().commit(); } /** * @param args */ public static void main(String[] args) { Main.test(); } public static class HibernateUtil { private static final SessionFactory sessionFactory; static { try { sessionFactory = new AnnotationConfiguration() .configure().buildSessionFactory(); } catch (Throwable ex) { // Log exception! throw new ExceptionInInitializerError(ex); } } public static Session getSession() throws HibernateException { return sessionFactory.openSession(); } } } </code></pre> <p>My hibernate config is very simple : </p> <pre><code> &lt;!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"&gt; &lt;hibernate-configuration&gt; &lt;session-factory&gt; &lt;!-- Database connection settings --&gt; &lt;property name="connection.driver_class"&gt;org.hsqldb.jdbcDriver&lt;/property&gt; &lt;property name="connection.url"&gt;jdbc:hsqldb:hsql://localhost&lt;/property&gt; &lt;property name="connection.username"&gt;sa&lt;/property&gt; &lt;property name="connection.password"&gt;&lt;/property&gt; &lt;!-- JDBC connection pool (use the built-in) --&gt; &lt;property name="connection.pool_size"&gt;1&lt;/property&gt; &lt;!-- SQL dialect --&gt; &lt;property name="dialect"&gt;org.hibernate.dialect.HSQLDialect&lt;/property&gt; &lt;!-- Enable Hibernate's automatic session context management --&gt; &lt;property name="current_session_context_class"&gt;thread&lt;/property&gt; &lt;!-- Disable the second-level cache --&gt; &lt;property name="cache.provider_class"&gt;org.hibernate.cache.NoCacheProvider&lt;/property&gt; &lt;!-- Echo all executed SQL to stdout --&gt; &lt;property name="show_sql"&gt;true&lt;/property&gt; &lt;!-- Drop and re-create the database schema on startup --&gt; &lt;property name="hbm2ddl.auto"&gt;update&lt;/property&gt; &lt;mapping package="fr.cc2i.intervention.dao.beans.Client" /&gt; &lt;mapping class="fr.cc2i.intervention.dao.beans.Contrat" /&gt; &lt;mapping class="fr.cc2i.intervention.dao.beans.Intervention" /&gt; &lt;mapping class="fr.cc2i.intervention.dao.beans.Technicien" /&gt; &lt;/session-factory&gt; &lt;/hibernate-configuration&gt; </code></pre> <p>Here is the hibernate maven dependency i am using :</p> <pre><code>&lt;properties&gt; &lt;org.springframework.version&gt;3.0.3.RELEASE&lt;/org.springframework.version&gt; &lt;hibernate.version&gt;3.6.0.Beta1&lt;/hibernate.version&gt;&lt;/properties&gt; &lt;dependency&gt; &lt;groupId&gt;org.hibernate&lt;/groupId&gt; &lt;artifactId&gt;hibernate-entitymanager&lt;/artifactId&gt; &lt;version&gt;${hibernate.version}&lt;/version&gt; &lt;type&gt;jar&lt;/type&gt; &lt;scope&gt;compile&lt;/scope&gt; &lt;/dependency&gt; </code></pre> <p>Can someone help me please ??</p>
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    1. CO[not a duplicate but another question about this error](http://stackoverflow.com/questions/1980452/what-causes-java-lang-incompatibleclasschangeerror)
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