matthiasblaesing commented on code in PR #5609:
URL: https://github.com/apache/netbeans/pull/5609#discussion_r1137600559


##########
nbbuild/antsrc/org/netbeans/nbbuild/CustomJavac.java:
##########
@@ -252,4 +276,144 @@ private static boolean isIgnored(
         return false;
     }
 
+    private static final class NbJavacLoader extends URLClassLoader {
+        private static final String MAIN_COMPILER_CP = "nbjavac.class.path";
+        private static final String MAIN_COMPILER_CLASS = 
"com.sun.tools.javac.Main";
+        private final Map<String, Class<?>> priorityLoaded;
+
+        private NbJavacLoader(URL[] urls, ClassLoader parent) {
+            super(urls, parent);
+            this.priorityLoaded = new HashMap<>();

Review Comment:
   Thanks - this makes sense as I assume ant rebuilds the classloader for each 
javac invocation and that would explain your observation. Pulling it out into 
the global properties is an interesting idea to fix this.
   
   That leaves the question regarding the missing synchronization when 
accessing the HashMap in a potentially racy fashion.



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