1 files changed, 38 insertions, 0 deletions
diff --git a/src/test/javassist/HotswapTest.java b/src/test/javassist/HotswapTest.java
new file mode 100644
index 0000000..deab8fa
--- /dev/null
+++ b/src/test/javassist/HotswapTest.java
@@ -0,0 +1,38 @@
+package javassist;
+
+import javassist.util.HotSwapAgent;
+import junit.framework.TestCase;
+
+public class HotswapTest extends TestCase {
+    public static void main(String[] args) throws Exception {
+        // run java -javaagent:hotswap.jar javassist.HotswapTest
+        new HotswapTest(HotswapTest.class.getName()).testHotswap();
+    }
+
+    public HotswapTest(String name) {
+        super(name);
+    }
+
+    public static class Foo {
+        public int foo() { return 1; }
+    }
+
+    public void testHotswap() throws Exception {
+        if (javassist.bytecode.ClassFile.MAJOR_VERSION
+            >= javassist.bytecode.ClassFile.JAVA_9)
+            return;
+
+        Foo f = new Foo();
+        assertEquals(1, f.foo());
+
+        ClassPool cp = ClassPool.getDefault();
+        CtClass clazz = cp.get(Foo.class.getName());
+        CtMethod m = clazz.getDeclaredMethod("foo");
+        clazz.removeMethod(m);
+        clazz.addMethod(CtNewMethod.make("public int foo() { return 2; }", clazz));
+        HotSwapAgent.redefine(Foo.class, clazz);
+        Foo g = new Foo();
+        assertEquals(2, g.foo());
+        System.out.println("Foo#foo() = " + g.foo());
+    }
+}