si quelqu'un peut me dire ce que ces exceptions signifient?

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Exception in thread "main" net.sf.hibernate.TransactionException: Could not find UserTransaction in JNDI: 
	at net.sf.hibernate.transaction.JTATransaction.begin(JTATransaction.java:137)
	at net.sf.hibernate.transaction.JTATransactionFactory.beginTransaction(JTATransactionFactory.java:58)
	at net.sf.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:2231)
	at Test.main(Test.java:11)
Caused by: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
	at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
	at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
	at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
	at javax.naming.InitialContext.lookup(Unknown Source)
	at net.sf.hibernate.transaction.JTATransaction.begin(JTATransaction.java:133)
	... 3 more
Merci