code manipulation : 바이트 코드 변경하기(javaagent)

2021-02-18 22:16:32 +09:00
parent edd21fce02
commit 41890753df
3 changed files with 84 additions and 4 deletions
--- a/code-manipulation/JavaAgent/src/main/java/org/example/MasulsaAgent.java
+++ b/code-manipulation/JavaAgent/src/main/java/org/example/MasulsaAgent.java
@@ -0,0 +1,16 @@
+package org.example;
+
+import net.bytebuddy.agent.builder.AgentBuilder;
+import net.bytebuddy.implementation.FixedValue;
+import net.bytebuddy.matcher.ElementMatchers;
+
+import java.lang.instrument.Instrumentation;
+
+public class MasulsaAgent {
+
+    public static void premain(String agentArgs, Instrumentation inst) {
+        new AgentBuilder.Default()
+                .type(ElementMatchers.any())
+                .transform((builder, typeDescription, classLoader, javaModule) -> builder.method(ElementMatchers.named("pullOut")).intercept(FixedValue.value("Rabbit!!"))).installOn(inst);
+    }
+}