Description Resource Path Location Type Unknown Unknown Unknown org.eclipse.core.internal.resources.Marker is not of a displayable type

It is an access restriction error.

Method 1:
Global property Project>preferences>java>Compiler>Errors/Warnings> set the [Deprecated and restricted API>Forbidden reference Error] on the right to [Warning].

Method 2 (Ultimate method:)
Project properties preferences>java build path>Delete and re-import [JRE System Library in libraries] on the right.

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