fix for java8

Signed-off-by: pengzhile <pengzhile@gmail.com>

src/main/java/io/zhile/research/ja/netfilter/Initializer.java

@@ -8,7 +8,6 @@ import io.zhile.research.ja.netfilter.plugin.PluginManager;
 
 import java.io.File;
 import java.lang.instrument.Instrumentation;
-import java.lang.instrument.UnmodifiableClassException;
 
 public class Initializer {
     public static void init(String args, Instrumentation inst, File currentDirectory) {
@@ -30,10 +29,15 @@ public class Initializer {
         inst.addTransformer(Dispatcher.getInstance(), true);
 
         for (Class<?> c : inst.getAllLoadedClasses()) {
+            String name = c.getName();
+            if (name.startsWith("java.lang.invoke.LambdaForm$") || '[' == name.charAt(0)) {
+                continue;
+            }
+
             try {
                 inst.retransformClasses(c);
-            } catch (UnmodifiableClassException e) {
-                // ok, ok. just ignore
+            } catch (Throwable e) {
+                DebugInfo.output("Retransform class failed: " + name);
             }
         }
     }

src/main/java/io/zhile/research/ja/netfilter/Launcher.java

@@ -9,6 +9,8 @@ import java.net.URL;
 import java.util.jar.JarFile;
 
 public class Launcher {
+    private static final String VERSION = "v1.1.3";
+
     public static void main(String[] args) {
         printUsage();
     }
@@ -39,6 +41,8 @@ public class Launcher {
     private static void printUsage() {
         String content = "\n  ============================================================================  \n" +
                 "\n" +
+                "    ja-netfilter-" + VERSION +
+                "\n\n" +
                 "    A javaagent lib for network filter :)\n" +
                 "\n" +
                 "    https://github.com/pengzhile/ja-netfilter\n" +