How to get package data [jar file name] from stack trace?

Question

In the logback library, they have a way to get "stack traces with packaging data" (package and package versions).

Example:

java.lang.Exception: 99 is invalid
  at path.to.MyClass.myFunc(MyClass.java:431) [struts-1.2.9.jar:1.2.9]

How do I get "struts-1.2.9.jar" from a line in a stack trace?

Is there a method in Java or Scala that does this?

String getPackageName(String lineInTrace) {
    ...
    return packageName
}

p.s. I totally saw code like this online and then I lost it. — Michael Lafayette, Apr 16 '16 at 22:11
See [Determine which jar file a class is from](http://stackoverflow.com/questions/1983839/determine-which-jar-file-a-class-is-from) — , Apr 16 '16 at 22:51

score 2 · Accepted Answer · answered Apr 16 '16 at 22:58

Try this

for (StackTraceElement el : e.getStackTrace()) {
    Class<?> clazz = Class.forName(el.getClassName());
    String location = clazz.getProtectionDomain().getCodeSource().getLocation().toString();
    System.out.println(location.substring(location.lastIndexOf('/') +1));
}

score 0 · Answer 2 · answered Mar 17 '22 at 12:58

The stuff in the square brackets are the module name and version, in Java 9 and above. You can get the module name using StackTraceElement.getModuleName().

It seems that if you are not using modules, the jar file name is used instead of the module name.

How to get package data [jar file name] from stack trace?

2 Answers2