Question

After years of Java develoment, I was shocked to learn that the compiler doesn’t check if the package name really is the one corresponding to the Java source file’s path.

You can write this:

package abcd; 
class Xyz {
}

and it will compile even is Xyz.java is located in efgh folder. I get a warning while editing the file in Netbeans, but that’s about it. In fact, this had led to a bug that was very difficult to spot: http://netbeans.org/bugzilla/show_bug.cgi?id=197320

Any way to get warnings or errors anyway?

Answer 1

With gnu-find, you can search a whole project. cd to the project source root, and then:

find PROJECT -type f -name "*.java" -exec ./pmatchd.sh {} ";"

You need the pmatchd.sh – script:

#!/bin/bash
#
dir=$(dirname $1)
d=${dir//\//.}
headline=$(head -n1 $1) 
p=${headline#package }
if [[ $d";" != $p ]]
then 
    echo "mismatch: " + $d " " + $p + " " + $1
fi

If you like it, you will move it to a location in the path, not in the $PWD.