Merge pull request #588 from chadlwilson/fix-cleanup-for-war

fix: Fix spurious NullPointerExceptions during executable war shutdown

Author: chadlwilson

History.txt

@@ -1,5 +1,7 @@
 == Unreleased
 
+- fix: NullPointerException during shutdown with executable war files
+
 == 2.1.0
 
 Requires JRuby >= 9.4 due to needing Ruby 3.0+ compatibility.

ext/JarMain.java

@@ -222,7 +222,9 @@ protected boolean isSymlink(File file) throws IOException {
     public void run() {
         // If the URLClassLoader isn't closed, on Windows, temp JARs won't be cleaned up
         try {
-            invokeMethod(classLoader, "close");
+            if (classLoader != null) {
+                invokeMethod(classLoader, "close");
+            }
         }
         catch (NoSuchMethodException e) { } // We're not being run on Java >= 7
         catch (Exception e) { error(e); }