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happens in photon when - in the buildpath config, jre's module encapsulation is modified via --add-exports - more than 1 packages are added a sample .classpath file: <classpath> <classpathentry kind="src" path="src"/> <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/10-64-plain"> <attributes> <attribute name="module" value="true"/> <attribute name="add-exports" value="java.desktop/com.sun.beans.util=ALL-UNNAMED:java.desktop/com.sun.beans=ALL-UNNAMED"/> </attributes> </classpathentry> <classpathentry kind="output" path="bin"/> sample code: package plainjava; /** */ public class SimpleMain { public static void main(String[] args) { System.out.println("seeing ..."); } } output: WARNING: Unknown module: ALL-UNNAMED:java.desktop/com.sun.beans=ALL-UNNAMED specified to --add-exports seeing ... I can get rid off the warning by editing the default dependencies in the runtime configuration, the default is: --add-exports java.desktop/com.sun.beans.util=ALL-UNNAMED:java.desktop/com.sun.beans=ALL-UNNAMED edited to the format a commandline java expects: --add-exports java.desktop/com.sun.beans.util=ALL-UNNAMED --add-exports java.desktop/com.sun.beans=ALL-UNNAMED
This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet. If you have further information on the current state of the bug, please add it. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant. -- The automated Eclipse Genie.
looks fixed - now (Eclipse 2020-03) the default runtime dependencies are mapped as java expects (that instead of a single --add-exports with colon-separated list of exported packages now it's multiple --add-exports with a single package each)
