OS X 10.11 (El Capitan):
------------------------

java version "1.8.0_172"
Java(TM) SE Runtime Environment (build 1.8.0_172-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.172-b11, mixed mode)

java.lang.NullPointerException
	at org.eclipse.equinox.internal.p2.importexport.internal.ImportExportImpl.exportP2F(ImportExportImpl.java:68)
	at org.eclipse.equinox.internal.p2.importexport.internal.wizard.ExportPage$1.run(ExportPage.java:75)
	at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:122)


Linux (Kubuntu 18.04 LTS):
--------------------------

openjdk version "11.0.4" 2019-07-16
OpenJDK Runtime Environment (build 11.0.4+11-post-Ubuntu-1ubuntu218.04.3)
OpenJDK 64-Bit Server VM (build 11.0.4+11-post-Ubuntu-1ubuntu218.04.3, mixed mode, sharing)

GTK2 theme: Raleigh
GTK3 theme: Breeze

java.lang.NullPointerException
        at org.eclipse.equinox.internal.p2.importexport.internal.ImportExportImpl.exportP2F(ImportExportImpl.java:68)
        at org.eclipse.equinox.internal.p2.importexport.internal.wizard.ExportPage$1.run(ExportPage.java:75)
        at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:122)


Linux (Kubuntu 19.04):
----------------------

openjdk version "12.0.2" 2019-07-16
OpenJDK Runtime Environment (build 12.0.2+9-Ubuntu-119.04)
OpenJDK 64-Bit Server VM (build 12.0.2+9-Ubuntu-119.04, mixed mode)

GTK theme: breeze

Works, no null pointers.