/usr/bin/aj is in aspectj 1.6.12+dfsg-3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
AJPATH=/usr/share/java/aspectjweaver.jar
exec "${JAVACMD:=java}" -classpath "$AJPATH${CLASSPATH:+:$CLASSPATH}" \
-Djava.system.class.loader=org.aspectj.weaver.loadtime.WeavingURLClassLoader \
"-Daj.class.path=$ASPECTPATH${CLASSPATH:+:$CLASSPATH}" \
"-Daj.aspect.path=$ASPECTPATH" \
"$@"
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