add -h -help

Author: songlonqi-java

pom.xml

@@ -36,11 +36,11 @@
               </descriptorRefs>
               <archive>
                 <manifest>
-                  <mainClass>name.dhruba.javaagent.MyMainClass</mainClass>
+                  <mainClass>com.guance.javaagent.MyMainClass</mainClass>
                 </manifest>
               <manifestEntries>
-                  <Premain-Class>name.dhruba.javaagent.MyJavaAgent</Premain-Class>
-                  <Agent-Class>name.dhruba.javaagent.MyJavaAgent</Agent-Class>
+                  <Premain-Class>com.guance.javaagent.MyJavaAgent</Premain-Class>
+                  <Agent-Class>com.guance.javaagent.MyJavaAgent</Agent-Class>
                   <Can-Redefine-Classes>true</Can-Redefine-Classes>
                   <Can-Retransform-Classes>true</Can-Retransform-Classes>
                 </manifestEntries>

src/main/java/META-INF/MANIFEST.MF

@@ -1,3 +1,3 @@
 Manifest-Version: 1.0
-Main-Class: name.dhruba.javaagent.MyMainClass
+Main-Class: com.guance.javaagent.MyMainClass
 

src/main/java/com/guance/javaagent/ClassFileTransformer.java

@@ -0,0 +1,23 @@
+package com.guance.javaagent;
+
+import java.lang.instrument.IllegalClassFormatException;
+import java.security.ProtectionDomain;
+
+import org.objectweb.asm.Opcodes;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ClassFileTransformer implements java.lang.instrument.ClassFileTransformer, Opcodes {
+
+    static final Logger logger = LoggerFactory.getLogger(ClassFileTransformer.class);
+
+    @Override
+    public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,
+            ProtectionDomain protectionDomain, byte[] classfileBuffer)
+            throws IllegalClassFormatException {
+        logger.info("class file transformer invoked for className: {}", className);
+
+        return classfileBuffer;
+    }
+
+}

…n/java/name/dhruba/javaagent/Config.java …in/java/com/guance/javaagent/Config.javasrc/main/java/name/dhruba/javaagent/Config.java renamed to src/main/java/com/guance/javaagent/Config.java src/main/java/name/dhruba/javaagent/Config.java renamed to src/main/java/com/guance/javaagent/Config.java

@@ -1,4 +1,4 @@
-package name.dhruba.javaagent;
+package com.guance.javaagent;
 
 import java.io.PrintStream;
 
@@ -66,5 +66,6 @@ public static void printOut(){
         out.println(" this is dd-java-agnet.jar env, example:");
         out.println("    dd.agent.port=9529,dd.agent.host=localhost,dd.service=serviceName");
         out.println(" [-agent-jar]:");
+        out.println(" default is: /usr/local/ddtrace/dd-java-agent.jar");
     }
 }

…me/dhruba/javaagent/JavaAgentLoader.java …om/guance/javaagent/JavaAgentLoader.javasrc/main/java/name/dhruba/javaagent/JavaAgentLoader.java renamed to src/main/java/com/guance/javaagent/JavaAgentLoader.java src/main/java/name/dhruba/javaagent/JavaAgentLoader.java renamed to src/main/java/com/guance/javaagent/JavaAgentLoader.java

@@ -1,4 +1,4 @@
-package name.dhruba.javaagent;
+package com.guance.javaagent;
 
 import java.util.List;
 import com.sun.tools.attach.VirtualMachineDescriptor;

…a/name/dhruba/javaagent/MyJavaAgent.java …va/com/guance/javaagent/MyJavaAgent.javasrc/main/java/name/dhruba/javaagent/MyJavaAgent.java renamed to src/main/java/com/guance/javaagent/MyJavaAgent.java src/main/java/name/dhruba/javaagent/MyJavaAgent.java renamed to src/main/java/com/guance/javaagent/MyJavaAgent.java

@@ -1,4 +1,4 @@
-package name.dhruba.javaagent;
+package com.guance.javaagent;
 
 import java.lang.instrument.Instrumentation;
 

…a/name/dhruba/javaagent/MyMainClass.java …va/com/guance/javaagent/MyMainClass.javasrc/main/java/name/dhruba/javaagent/MyMainClass.java renamed to src/main/java/com/guance/javaagent/MyMainClass.java src/main/java/name/dhruba/javaagent/MyMainClass.java renamed to src/main/java/com/guance/javaagent/MyMainClass.java

@@ -1,4 +1,4 @@
-package name.dhruba.javaagent;
+package com.guance.javaagent;
 
 import java.util.Arrays;