/usr/bin/ajdoc 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 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | #!/bin/sh
guess_java_home() {
    if test "a$JAVA_HOME" = "a"; then
	JAVACMD=${JAVACMD:-`which java`}
	JAVACMD=`readlink -f $JAVACMD`
	if echo "$JAVACMD" | grep -E '^/usr/bin/gij-' >/dev/null;
	then
	    # gij special case
	    JAVA_HOME=/usr/lib/jvm/java-gcj
	else
	    JAVA_HOME=${JAVACMD%%/jre/bin/java}
	    JAVA_HOME=${JAVA_HOME%%/bin/java}
	fi
	if ! test -f "$JAVA_HOME/lib/tools.jar"; then
	    echo "$0: could not guess JAVA_HOME! Please define it" >&2
	    exit 1
	fi
    fi
}
AJPATH=/usr/share/java/aspectjtools.jar
guess_java_home
if test "a$JAVA_HOME" = "a/usr/lib/jvm/java-gcj";
then
    TOOLS_JAR=/usr/share/java/gnu-classpath-tools-gjdoc.jar:"$JAVA_HOME/lib/tools.jar"
else
    TOOLS_JAR="$JAVA_HOME/lib/tools.jar"
fi
exec "$JAVACMD" -classpath "$AJPATH:$TOOLS_JAR${CLASSPATH:+:$CLASSPATH}" \
  ${JAVA_OPTS:=-Xmx64M} \
  org.aspectj.tools.ajdoc.Main "$@"
 |