1.

Initial SessionFactory creation failed.java.lang.NoClassDefFoundError: com/mchange/v2/c3p0/DataSources

 

Exception in thread "main" java.lang.ExceptionInInitializerError
	at com.mkyong.persistence.HibernateUtil.buildSessionFactory(HibernateUtil.java:19)
	at com.mkyong.persistence.HibernateUtil.(HibernateUtil.java:8)
	at com.mkyong.common.App.main(App.java:11)
Caused by: java.lang.NoClassDefFoundError: com/mchange/v2/c3p0/DataSources
	at org.hibernate.connection.C3P0ConnectionProvider.configure(C3P0ConnectionProvider.java:154)
	at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:124)
	at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:56)
	at org.hibernate.cfg.SettingsFactory.createConnectionProvider(SettingsFactory.java:410)
	at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:62)
	at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2009)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1292)
	at com.mkyong.persistence.HibernateUtil.buildSessionFactory(HibernateUtil.java:13)
	... 2 more
Caused by: java.lang.ClassNotFoundException: com.mchange.v2.c3p0.DataSources
	at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
	... 10 more
原因:

没有导入连接池包（c3p0-0.8.5.2.jar）

 

2.

Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]

原因:

缺少 javassist.jar