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.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! Any suggestion?
Thanks,

Eddy

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