Eclipse fails to start after recent update

[Derkades]

!SESSION 2021-07-10 12:24:30.721 -----------------------------------------------
eclipse.buildId=4.20.0.I20210611-1600
java.version=16.0.1
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Framework arguments:  -product org.eclipse.epp.package.java.product
Command-line arguments:  -os linux -ws gtk -arch x86_64 -product org.eclipse.epp.package.java.product

!ENTRY org.eclipse.osgi 4 0 2021-07-10 12:24:31.497
!MESSAGE Application error
!STACK 1
java.lang.IllegalStateException: Unable to acquire application service. Ensure that the org.eclipse.core.runtime bundle is resolved and started (see config.ini).
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:81)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:654)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1462)
        at org.eclipse.equinox.launcher.Main.main(Main.java:1435)

[Derkades]

#12 looks similar (log paste has unfortunately expired) but flatpak run org.eclipse.Java -clean didn't help

[Derkades]

doing a flatpak remove followed by flatpak install fixed the issue, and apparently even without losing any data