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It looks like you're missing a library that Hibernate needs at run time. I saw the same behavior as you with your code (MySQL 5, MySQL JDBC driver, Mac OS) until I changed the line: <pre><code>catch (Exception e) { System.out.println(e.getMessage()); } </code></pre> To: <pre><code>catch (Throwable e) { e.printStackTrace(); } </code></pre> I then started seeing a whole set of <code>NoClassDefFoundError</code> and <code>ClassNotFoundError</code> messages about libraries that Hibernate was looking for but were not included in my CLASSPATH. I suspect that you're missing a library that Hibernate needs, and because you're catching <code>Exception</code> and not <code>Throwable</code> - which catches <code>Error</code> - you're not seeing the error message. See: <a href="https://stackoverflow.com/questions/581878/why-catch-exceptions-in-java-when-you-can-catch-throwables">Why catch Exceptions in Java, when you can catch Throwables?</a> If you catch the <code>Throwable</code> you'll see fairly quickly what libraries and classes you're missing: my guess would be that you're probably missing EHCache (which Hibernate seems to use as a second-level cache by default), CGLIB/ASM, or the Java Transaction API. If you're missing EHCache and you want hibernate to use its own, in-memory Hashtable cache instead of EHCache, add the line below to <code>hibernate.cfg.xml</code>: <pre><code><property name="hibernate.cache.provider_class">org.hibernate.cache.HashtableCacheProvider</property> </code></pre> Update, based on comments to answer: I don't use NetBeans and so I haven't run into this problem, but it appears fairly widespread. See: <a href="https://stackoverflow.com/questions/2432471/error-java-lang-nosuchmethoderror-org-objectweb-asm-classwriter-initiv">Error : java.lang.NoSuchMethodError: org.objectweb.asm.ClassWriter.<init>(I)V</a> <a href="http://www.hildeberto.com/2008/05/hibernate-and-jersey-conflict-on.html" rel="nofollow noreferrer">http://www.hildeberto.com/2008/05/hibernate-and-jersey-conflict-on.html</a> (Reports a similar problem with Hibernate and Jersey in Netbeans) <a href="https://hibernate.onjira.com/browse/HHH-2222" rel="nofollow noreferrer">https://hibernate.onjira.com/browse/HHH-2222</a> (Hibernate bug report mentioning this problem) <a href="http://netbeans.org/bugzilla/show_bug.cgi?id=145589" rel="nofollow noreferrer">http://netbeans.org/bugzilla/show_bug.cgi?id=145589</a> (Netbeans bug report for bundled Hibernate using older versions of cglib). The StackOverflow post linked to above has quite a lot of detail. To summarize: <ul> <li>Hibernate 3.2 uses CGLib 2.1.3 for run-time code generation, to improve performance and to generate proxies for one-to-one and one-to-many mappings. </li> <li>CGLib is a higher-level wrapper around ASM, a bytecode manipulation library. CGLib 2.1.3 requires ASM 1.5.3, which is binary incompatible with ASM 2.2. ASM 2.2 in turn is a dependency for Spring versions < 2.5.</li> <li>To resolve these problems between Hibernate and Spring, Spring 2.5 bundles its own version of asm with a spring package name; later versions of Hibernate use CGLIB 2.2, which also bundles its own version of ASM with a custom package name. The most recent versions of Hibernate do away with CGLIB altogether and use Javassist instead, but NetBeans still bundles Hibernate 3.2.5.</li> </ul> You have a few options, then: <ul> <li>Update the Hibernate library package in Netbeans with CGLIB 2.2</li> <li>Tell Hibernate to use Javassist for runtime code generation. Add this line to hibernate.properties, or specify it as a system property using -D (you can't specify this property in hibernate.cfg.xml, apparently): <code>hibernate.bytecode.provider=javassist</code></li> </ul> Good luck, this has been rather an interesting question!
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