spring-boot-demo-oom: five real memory-leak demos with captured OOM + MAT evidence

classloader-leak/plugin-src/com/ankurm/oomplugin/PluginTask.java

@@ -0,0 +1,25 @@
+package com.ankurm.oomplugin;
+
+/**
+ * The "plugin" that gets hot-reloaded. Deliberately simple: one sizeable field so each
+ * reload's copy of this class has a visible memory footprint in the heap dump, and one
+ * method so the reload actually does something observable.
+ *
+ * This file is compiled once by scripts/build-plugin.sh into classloader-leak's resources
+ * as a committed .class file -- it is intentionally NOT part of the module's own Maven
+ * compilation unit, because the whole point of the demo is loading these bytes through a
+ * *different* ClassLoader on every "reload", which only makes sense if the bytes already
+ * exist as a resource rather than as a class the app's own classloader already loaded.
+ */
+public class PluginTask implements Runnable {
+    private final byte[] payload = new byte[256 * 1024];
+
+    public PluginTask() {
+        payload[0] = 1;
+    }
+
+    @Override
+    public void run() {
+        payload[1] = 2;
+    }
+}