J2EE won't start. With error ClassNotFoundException: oracle.jdbc.OracleDriver

Hi,

we have problems with a J2ee System. Since a reboot of the Server it won't start. In log_bootstrap.log it shows following errors:

com.sap.engine.bootstrap.SynchronizationException: Database initialization failed! Check database properties!

com.sap.engine.frame.core.configuration.ConfigurationException: Error while connecting to DB.

Caused by: java.lang.ClassNotFoundException: oracle.jdbc.OracleDriver

Nothing in the configuration was changed. the path to the driver is correct.

/oracle/client/10x_64/instantclient/classes12.jar

I overwrote the user Passwort in the configtool. But it changed nothing.

I checked SAP-Node 997510.

Any other ideas ?

Thanks

Xeon ?