Configuration classpath librairie externe

Bonjours,

Je travaille actuellement sur un projet qui comporte beaucoup de projet différent.
Actuellement, pour mon projet, j'utilise des archives jars que l'on me passe.
A la compilation, eclipse note aucune erreur. Mais a l'execution, il m'indique une erreur.

au niveau de cette ligne :

Code:

RegistreAcquisitionBO loader = RegistreAcquisitionBO.getInstance();

Il indique :

Code:

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java.lang.NoClassDefFoundError: fr/projet/esg/in/register/business/RegistreAcquisitionBO
	at fr.projet.acquisition.migration.format.MediaDataFormatManager.loadFromXML(MediaDataFormatManager.java:34)
	at fr.projet.gdm.acquisition.wizard.mediadatatree.MediaDataTreeViewer.<init>(MediaDataTreeViewer.java:52)
	at fr.projet.gdm.acquisition.wizard.pages.IdentificationDonneesPage.createControl(IdentificationDonneesPage.java:103)
	at org.eclipse.jface.wizard.Wizard.createPageControls(Wizard.java:170)
	at org.eclipse.jface.wizard.WizardDialog.createPageControls(WizardDialog.java:669)
	at org.eclipse.jface.wizard.WizardDialog.createContents(WizardDialog.java:543)
	at org.eclipse.jface.window.Window.create(Window.java:431)
	at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089)
	at org.eclipse.jface.window.Window.open(Window.java:790)
	at fr.projet.gdm.acquisition.wizard.WizardLaucher.run(WizardLaucher.java:30)
	at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:251)
	at org.eclipse.ui.internal.WWinPluginAction.runWithEvent(WWinPluginAction.java:229)
	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:583)
	at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:500)
	at org.eclipse.jface.action.ActionContributionItem$6.handleEvent(ActionContributionItem.java:452)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3823)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3422)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at net.refractions.udig.internal.ui.UDIGApplication.start(Unknown Source)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:382)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1212)
Caused by: java.lang.ClassNotFoundException: fr.projet.esg.in.register.business.RegistreAcquisitionBO
	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:481)
	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:397)
	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:385)
	at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:87)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClassInternal(Unknown Source)
	... 40 more

Je poste la, car on pense que c'est un problème de linkage des jars et que du coup il ne trouve pas l'objet.
Je les ai lié en tant que librairie externe.