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dbca problems in 21c XE on linux

we did NOT have installed the X11 Libs.

So are the X11 Libs neccessary ?

the following Error-Output :

dbca

Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11.XToolkit

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:264)

at java.awt.Toolkit$2.run(Toolkit.java:860)

at java.awt.Toolkit$2.run(Toolkit.java:855)

at java.security.AccessController.doPrivileged(Native Method)

at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:854)

at com.jgoodies.looks.LookUtils.isLowResolution(LookUtils.java:484)

at com.jgoodies.looks.LookUtils.<clinit>(LookUtils.java:249)

at com.jgoodies.looks.plastic.PlasticLookAndFeel.<clinit>(PlasticLookAndFeel.java:136)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:348)

at javax.swing.SwingUtilities.loadSystemClass(SwingUtilities.java:1879)

at javax.swing.UIManager.setLookAndFeel(UIManager.java:582)

at oracle.install.commons.util.Application.startup(Application.java:976)

at oracle.install.commons.flow.FlowApplication.startup(FlowApplication.java:181)

at oracle.install.commons.flow.FlowApplication.startup(FlowApplication.java:198)

at oracle.assistants.common.base.driver.AssistantApplication.startup(AssistantApplication.java:340)

at oracle.assistants.dbca.driver.DBConfigurator.startup(DBConfigurator.java:421)

at oracle.assistants.dbca.driver.DBConfigurator.main(DBConfigurator.java:556)

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