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Why won't Eclipse Oxygen start for the first time?
Eclipse Oxygen requires Java 9 with the java.se.ee module to run. If you are using Java 9, you need to modify the eclipse.ini file in your Eclipse installation and add the following line:
--add-modules=java.se.ee
as a line following the -vmargs line in the file. This will add the Java 9 module that contains the missing classes.
You can also use the following line:
--add-modules=ALL-SYSTEM
See Eclipse Wiki: Configure Eclipse for Java 9.
Note: Eclipse Oxygen.1a (4.7.1a) is due to be released on 11 October (2017) with full Java 9 support.
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