The default ebuild of weka fails to open with missing flatlaf jar, that because most of the prebundle jars are not push or included when weka is install. Bellow is the list of jars that are available in the gentoo repo (with the corresponding slots, when needed): dev-java/commons-compress:0 dev-java/hamcrest-core:1.3 dev-java/istack-commons-runtime:3 dev-java/jakarta-activation-api:1 dev-java/jaxb-api:2 dev-java/jaxb-runtime:2 dev-java/jflex:0 dev-java/junit:4" Bellow there a list of jars that are extracted from weka source (not available in gentoo): lib/arpack_combined.jar lib/bounce.jar lib/core.jar lib/flatlaf-2.0.jar lib/jclipboardhelper-0.1.2.jar lib/jfilechooser-bookmarks-0.1.6.jar lib/mtj.jar This fix the problem the missing jar error and allow weka to be launch when java-8 to 17 is used. When java-21 is used we get the following error: ``` java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:118) at java.base/java.lang.reflect.Method.invoke(Method.java:580) at weka.gui.SplashWindow.invokeMain(SplashWindow.java:306) at weka.gui.GUIChooser.main(GUIChooser.java:92) Caused by: java.lang.UnsupportedOperationException: The Security Manager is deprecated and will be removed in a future release at java.base/java.lang.System.setSecurityManager(System.java:430) at weka.gui.GUIChooserApp.main(GUIChooserApp.java:1675) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ... 3 more ``` This is because Security Manager is being removed from java, the only way to fix this will be to manually patch weka or force to only use java-17 and bellow. Here is a PR with the missing jar already apply to the ebuild: https://github.com/gentoo/gentoo/pull/39138
I am presently having a very basic problem with this package: Exception in thread "main" java.awt.HeadlessException: No X11 DISPLAY variable was set, or no headful library support was found, but this program performed an operation which requires it, at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:158) at java.desktop/java.awt.Window.<init>(Window.java:518) at java.desktop/java.awt.Frame.<init>(Frame.java:428) at java.desktop/java.awt.Frame.<init>(Frame.java:393) at weka.gui.SplashWindow.splash(SplashWindow.java:208) at weka.gui.SplashWindow.splash(SplashWindow.java:252) at weka.gui.GUIChooser.main(GUIChooser.java:90)
