diff --git a/README.md b/README.md
index 8c0a5a6..302c5e3 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# ja-netfilter v2.0.1
+# ja-netfilter v2.1.0
 
 ### A javaagent framework
 
@@ -11,6 +11,10 @@
     * **WARNING: DO NOT put some unnecessary whitespace characters!**
 
 * edit your plugin config files: `${lower plugin name}.conf` file in the `conf` dir where `ja-netfilter.jar` is located.
+* the `conf` and `plugins` directory can be specified through **the javaagent args**.
+  * eg: `-javaagent:/path/to/ja-netfilter.jar=appName`, your config and plugins directories will be `conf-appname` and `plugins-appname`.
+  * if no javaagent args, they default to `conf` and `plugins`.
+  * this mechanism will avoid extraneous and bloated `conf` and `plugins`.
 
 * run your java application and enjoy~
 
diff --git a/pom.xml b/pom.xml
index 16cbe1c..2ef86a3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>com.ja-netfilter</groupId>
     <artifactId>ja-netfilter</artifactId>
-    <version>2.0.1</version>
+    <version>2.1.0</version>
 
     <name>ja-netfilter</name>
     <description>A javaagent framework</description>
diff --git a/src/main/java/com/janetfilter/core/Environment.java b/src/main/java/com/janetfilter/core/Environment.java
index 312fdd2..aa4ae89 100644
--- a/src/main/java/com/janetfilter/core/Environment.java
+++ b/src/main/java/com/janetfilter/core/Environment.java
@@ -1,5 +1,7 @@
 package com.janetfilter.core;
 
+import com.janetfilter.core.utils.StringUtils;
+
 import java.io.File;
 
 public final class Environment {
@@ -9,10 +11,21 @@ public final class Environment {
     private final File pluginsDir;
 
     public Environment(File agentFile) {
+        this(agentFile, null);
+    }
+
+    public Environment(File agentFile, String app) {
         this.agentFile = agentFile;
         baseDir = agentFile.getParentFile();
-        configDir = new File(baseDir, "config");
-        pluginsDir = new File(baseDir, "plugins");
+
+        if (StringUtils.isEmpty(app)) {
+            configDir = new File(baseDir, "config");
+            pluginsDir = new File(baseDir, "plugins");
+        } else {
+            app = app.toLowerCase();
+            configDir = new File(baseDir, "config-" + app);
+            pluginsDir = new File(baseDir, "plugins-" + app);
+        }
     }
 
     public File getBaseDir() {
@@ -30,4 +43,14 @@ public final class Environment {
     public File getPluginsDir() {
         return pluginsDir;
     }
+
+    @Override
+    public String toString() {
+        return "Environment: {" +
+                "\n\tbaseDir=" + baseDir +
+                ", \n\tagentFile=" + agentFile +
+                ", \n\tconfigDir=" + configDir +
+                ", \n\tpluginsDir=" + pluginsDir +
+                "\n}";
+    }
 }
diff --git a/src/main/java/com/janetfilter/core/Initializer.java b/src/main/java/com/janetfilter/core/Initializer.java
index e827a5c..f6d100b 100644
--- a/src/main/java/com/janetfilter/core/Initializer.java
+++ b/src/main/java/com/janetfilter/core/Initializer.java
@@ -8,6 +8,8 @@ import java.util.Set;
 
 public class Initializer {
     public static void init(Instrumentation inst, Environment environment) {
+        DebugInfo.output(environment.toString());
+
         Dispatcher dispatcher = new Dispatcher();
         new PluginManager(inst, dispatcher, environment).loadPlugins();
 
diff --git a/src/main/java/com/janetfilter/core/Launcher.java b/src/main/java/com/janetfilter/core/Launcher.java
index 724dad2..66ed0e9 100644
--- a/src/main/java/com/janetfilter/core/Launcher.java
+++ b/src/main/java/com/janetfilter/core/Launcher.java
@@ -9,7 +9,7 @@ import java.net.URL;
 import java.util.jar.JarFile;
 
 public class Launcher {
-    private static final String VERSION = "v2.0.1";
+    private static final String VERSION = "v2.1.0";
 
     public static void main(String[] args) {
         printUsage();
@@ -34,7 +34,7 @@ public class Launcher {
             return;
         }
 
-        Initializer.init(inst, new Environment(agentFile)); // for some custom UrlLoaders
+        Initializer.init(inst, new Environment(agentFile, args)); // for some custom UrlLoaders
     }
 
     private static void printUsage() {
@@ -58,7 +58,7 @@ public class Launcher {
             return url.toURI();
         }
 
-        String resourcePath = "/5a1666cf298cd1d4fa64d62d123af55f5f39024f.txt";
+        String resourcePath = "/4cc9c353c626d6510ca855ab6907ed7f64400257.txt";
         url = Launcher.class.getResource(resourcePath);
         if (null == url) {
             throw new Exception("Can not locate resource file.");
diff --git a/src/main/java/com/janetfilter/core/commons/DebugInfo.java b/src/main/java/com/janetfilter/core/commons/DebugInfo.java
index 0f54b5d..7127313 100644
--- a/src/main/java/com/janetfilter/core/commons/DebugInfo.java
+++ b/src/main/java/com/janetfilter/core/commons/DebugInfo.java
@@ -4,6 +4,8 @@ import com.janetfilter.core.utils.DateUtils;
 
 public class DebugInfo {
     private static final boolean DEBUG = "1".equals(System.getenv("JANF_DEBUG")) || "1".equals(System.getProperty("janf.debug"));
+    private static final String CLASS_NAME = DebugInfo.class.getName();
+    private static final String LOG_TEMPLATE = "[%s] %s DEBUG : %s%n";
 
     public static void output(String content) {
         output(content, null);
@@ -14,12 +16,17 @@ public class DebugInfo {
             return;
         }
 
-        String template = "[%s] %s DEBUG : %s%n";
-
+        String caller = "UNKNOWN";
         StackTraceElement[] traces = new Throwable().getStackTrace();
-        String caller = traces.length < 2 ? "UNKNOWN" : traces[1].toString();
+        for (int i = 1, l = traces.length; i < l; i++) {    // thank RayGicEFL
+            StackTraceElement element = traces[i];
+            if (!CLASS_NAME.equals(element.getClassName())) {
+                caller = element.toString();
+                break;
+            }
+        }
 
-        String outContent = String.format(template, DateUtils.formatNow(), caller, content);
+        String outContent = String.format(LOG_TEMPLATE, DateUtils.formatNow(), caller, content);
         if (null == e) {
             System.out.print(outContent);
             return;
diff --git a/src/main/resources/5a1666cf298cd1d4fa64d62d123af55f5f39024f.txt b/src/main/resources/4cc9c353c626d6510ca855ab6907ed7f64400257.txt
similarity index 100%
rename from src/main/resources/5a1666cf298cd1d4fa64d62d123af55f5f39024f.txt
rename to src/main/resources/4cc9c353c626d6510ca855ab6907ed7f64400257.txt