/usr/share/proton-0.14.0/examples/engine/java/ is in libqpid-proton8-dev-examples 0.14.0-5.1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/proton-0.14.0/examples/engine/java/drain
/usr/share/proton-0.14.0/examples/engine/java/pom.xml
/usr/share/proton-0.14.0/examples/engine/java/server
/usr/share/proton-0.14.0/examples/engine/java/spout
/usr/share/proton-0.14.0/examples/engine/java/src/
/usr/share/proton-0.14.0/examples/engine/java/src/main/
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/apache/
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/apache/qpid/
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/apache/qpid/proton/
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/apache/qpid/proton/examples/
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/apache/qpid/proton/examples/Drain.java
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/apache/qpid/proton/examples/Driver.java
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/apache/qpid/proton/examples/FlowController.java
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/apache/qpid/proton/examples/Handshaker.java
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/apache/qpid/proton/examples/Message.java
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/apache/qpid/proton/examples/Pool.java
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/apache/qpid/proton/examples/Router.java
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/apache/qpid/proton/examples/Server.java
/usr/share/proton-0.14.0/examples/engine/java/src/main/java/org/apache/qpid/proton/examples/Spout.java