BAEL-4477 Add a class to demonstrate that the app will crash if too many objects have a finalizer (eugenp#10200)

nguyennamthai · web-flow · commit d0593dcc4042 · 2020-10-28T07:12:52.000+01:00
diff --git a/core-java-modules/core-java-lang/src/main/java/com/baeldung/finalize/CrashedFinalizable.java b/core-java-modules/core-java-lang/src/main/java/com/baeldung/finalize/CrashedFinalizable.java
@@ -0,0 +1,28 @@
+package com.baeldung.finalize;
+
+import java.lang.ref.ReferenceQueue;
+import java.lang.reflect.Field;
+
+public class CrashedFinalizable {
+    public static void main(String[] args) throws ReflectiveOperationException {
+        for (int i = 0; ; i++) {
+            new CrashedFinalizable();
+            if ((i % 1_000_000) == 0) {
+                Class<?> finalizerClass = Class.forName("java.lang.ref.Finalizer");
+                Field queueStaticField = finalizerClass.getDeclaredField("queue");
+                queueStaticField.setAccessible(true);
+                ReferenceQueue<Object> referenceQueue = (ReferenceQueue) queueStaticField.get(null);
+
+                Field queueLengthField = ReferenceQueue.class.getDeclaredField("queueLength");
+                queueLengthField.setAccessible(true);
+                long queueLength = (long) queueLengthField.get(referenceQueue);
+                System.out.format("There are %d references in the queue%n", queueLength);
+            }
+        }
+    }
+
+    @Override
+    protected void finalize() {
+        System.out.print("");
+    }
+}
