/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/ is in openjdk-11-demo 10.0.1+10-3ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/FileChooserDemo/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/FileChooserDemo/build.properties
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/FileChooserDemo/build.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/FileChooserDemo/nbproject/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/FileChooserDemo/nbproject/file-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/FileChooserDemo/nbproject/jdk.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/FileChooserDemo/nbproject/netbeans-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/FileChooserDemo/nbproject/project.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Font2DTest/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Font2DTest/build.properties
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Font2DTest/build.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Font2DTest/nbproject/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Font2DTest/nbproject/file-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Font2DTest/nbproject/jdk.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Font2DTest/nbproject/netbeans-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Font2DTest/nbproject/project.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Metalworks/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Metalworks/build.properties
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Metalworks/build.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Metalworks/nbproject/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Metalworks/nbproject/file-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Metalworks/nbproject/jdk.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Metalworks/nbproject/netbeans-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Metalworks/nbproject/project.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Notepad/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Notepad/build.properties
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Notepad/build.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Notepad/nbproject/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Notepad/nbproject/file-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Notepad/nbproject/jdk.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Notepad/nbproject/netbeans-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/Notepad/nbproject/project.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SampleTree/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SampleTree/build.properties
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SampleTree/build.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SampleTree/nbproject/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SampleTree/nbproject/file-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SampleTree/nbproject/jdk.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SampleTree/nbproject/netbeans-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SampleTree/nbproject/project.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SwingApplet/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SwingApplet/build.properties
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SwingApplet/build.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SwingApplet/nbproject/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SwingApplet/nbproject/file-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SwingApplet/nbproject/jdk.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SwingApplet/nbproject/netbeans-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/SwingApplet/nbproject/project.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TableExample/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TableExample/build.properties
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TableExample/build.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TableExample/nbproject/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TableExample/nbproject/file-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TableExample/nbproject/jdk.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TableExample/nbproject/netbeans-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TableExample/nbproject/project.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TransparentRuler/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TransparentRuler/build.properties
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TransparentRuler/build.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TransparentRuler/nbproject/
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TransparentRuler/nbproject/file-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TransparentRuler/nbproject/jdk.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TransparentRuler/nbproject/netbeans-targets.xml
/usr/share/doc/openjdk-11-jre-headless/demo/nbproject/jfc/TransparentRuler/nbproject/project.xml