Java error installing Oracle 8.1.7 EE on Suse 7.2

Hi,
during the installation, when I press the NEXT button in the "Database Identification" section, the installation doesn't continue. In the error log file oraInstall.err there's the following error:

java.lang.NoClassDefFoundError:
oracle/ewt/scrolling/scrollBox/EwtLWScrollbar$Updater

        at oracle.ewt.scrolling.scrollBox.EwtLWScrollbar.setValues(Unknown Source)

	at oracle.ewt.lwAWT.LWScrollbar.setMaximum(Unknown Source)
	at oracle.ewt.EwtComponent._configureAdjustable(Unknown Source)
	at oracle.ewt.EwtComponent._configureHAdjustable(Unknown Source)
	at oracle.ewt.EwtComponent.setCanvasSize(Unknown Source)
	at oracle.ewt.dTree.DTree.itemsAdded(Unknown Source)
	at oracle.ewt.dTree.DTreeSimpleParent.addItems(Unknown Source)
	at oracle.ewt.dTree.DTreeSimpleParent.addItem(Unknown Source)
	at oracle.ewt.dTree.DTreeSimpleParent.addItem(Unknown Source)
	at
oracle.sysman.oii.oiif.oiifp.OiifpSummaryPanel.addGlobalInfos(OiifpSummaryPanel.java:566)
	at
oracle.sysman.oii.oiif.oiifp.OiifpSummaryPanel.populateTree(OiifpSummaryPanel.java:295)
	at
oracle.sysman.oii.oiif.oiifp.OiifpSummaryPanel.init(OiifpSummaryPanel.java:279)
	at
oracle.sysman.oii.oiif.oiifw.OiifwSummaryWCDE.setDialogProperties(OiifwSummaryWCDE.java:164)
	at
oracle.sysman.oii.oiif.oiifb.OiifbWizChainDlgElem.doOperation(OiifbWizChainDlgElem.java:474)
	at
oracle.sysman.oii.oiif.oiifb.OiifbLinearIterator.iterate(OiifbLinearIterator.java:116)
	at
oracle.sysman.oii.oiic.OiicInstallSession$OiicSelCompsInstall.doOperation(OiicInstallSession.java:689)
	at
oracle.sysman.oii.oiif.oiifb.OiifbCondIterator.iterate(OiifbCondIterator.java:140)
	at
oracle.sysman.oii.oiic.OiicPullSession.doOperation(OiicPullSession.java:511)
	at
oracle.sysman.oii.oiic.OiicSessionWrapper.doOperation(OiicSessionWrapper.java:111)
	at
oracle.sysman.oii.oiif.oiifb.OiifbLinearIterator.iterate(OiifbLinearIterator.java:116)
	at oracle.sysman.oii.oiic.OiicInstaller.run(OiicInstaller.java:307)
	at oracle.sysman.oii.oiic.OiicInstaller.main(OiicInstaller.java:468)

But under
/tmp/ORACLE/Disk1/stage/Components/oracle.swd.oui/1.7.1.8.0./1/DataFiles/Expanded/lib there's the ewt.jar file! And it contains all the needed classes! Can you help me?
Thanks,

Eddy

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