NullPointerException lors de la génération de code Hibernate

Bonjour,

J'ai l'erreur suivante lors du : hibernate Code Generation:

Code:

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java.lang.NullPointerException
	at org.hibernate.mapping.ForeignKey.alignColumns(ForeignKey.java:100)
	at org.hibernate.mapping.ForeignKey.alignColumns(ForeignKey.java:96)
	at org.hibernate.cfg.Configuration.secondPassCompileForeignKeys(Configuration.java:1354)
	at org.hibernate.cfg.JDBCMetaDataConfiguration.secondPassCompileForeignKeys(JDBCMetaDataConfiguration.java:34)
	at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1261)
	at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1206)
	at org.jboss.tools.hibernate3_5.console.ConsoleExtension3_5$2.execute(ConsoleExtension3_5.java:256)
	at org.hibernate.console.execution.DefaultExecutionContext.execute(DefaultExecutionContext.java:63)
	at org.hibernate.console.ConsoleConfiguration.execute(ConsoleConfiguration.java:107)
	at org.jboss.tools.hibernate3_5.console.ConsoleExtension3_5.buildConfiguration(ConsoleExtension3_5.java:223)
	at org.jboss.tools.hibernate3_5.console.ConsoleExtension3_5.runExporters(ConsoleExtension3_5.java:155)
	at org.jboss.tools.hibernate3_5.console.ConsoleExtension3_5.launchExporters(ConsoleExtension3_5.java:114)
	at org.hibernate.eclipse.launch.CodeGenerationLaunchDelegate.launch(CodeGenerationLaunchDelegate.java:270)
	at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:854)
	at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:703)
	at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:937)
	at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1141)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

J'ai pas compris la cause de cette erreur.

Merci pour votre aide