isolate java agent to prevent class loader issues

core/agent/src/main/java/com/volmit/iris/util/agent/Installer.java

@@ -0,0 +1,29 @@
+package com.volmit.iris.util.agent;
+
+import java.lang.instrument.Instrumentation;
+
+public class Installer {
+    private static volatile Instrumentation instrumentation;
+
+    public static Instrumentation getInstrumentation() {
+        Instrumentation instrumentation = Installer.instrumentation;
+        if (instrumentation == null) {
+            throw new IllegalStateException("The agent is not loaded or this method is not called via the system class loader");
+        }
+        return instrumentation;
+    }
+
+    public static void premain(String arguments, Instrumentation instrumentation) {
+        doMain(instrumentation);
+    }
+
+    public static void agentmain(String arguments, Instrumentation instrumentation) {
+        doMain(instrumentation);
+    }
+
+    private static synchronized void doMain(Instrumentation instrumentation) {
+        if (Installer.instrumentation != null)
+            return;
+        Installer.instrumentation = instrumentation;
+    }
+}