diff --git a/one-java-agent-plugin/src/main/java/io/oneagent/plugin/TraditionalPlugin.java b/one-java-agent-plugin/src/main/java/io/oneagent/plugin/TraditionalPlugin.java
index 3134402..c5a94b8 100644
--- a/one-java-agent-plugin/src/main/java/io/oneagent/plugin/TraditionalPlugin.java
+++ b/one-java-agent-plugin/src/main/java/io/oneagent/plugin/TraditionalPlugin.java
@@ -7,6 +7,7 @@
 import java.net.URL;
 import java.util.Properties;
 import java.util.jar.JarFile;
+import java.util.jar.Manifest;
 
 import io.oneagent.plugin.classloader.PluginClassLoader;
 import io.oneagent.plugin.config.PluginConfig;
@@ -96,15 +97,29 @@ public void start() throws PluginException {
             }
 
             Class<?> clazz = null;
-            if (this.pluginConfig.isAppendToSystemClassLoaderSearch()) {
-                this.instrumentation.appendToSystemClassLoaderSearch(new JarFile(agentJarFile));
-                this.parentClassLoader = ClassLoader.getSystemClassLoader();
-            } else {
-                this.parentClassLoader = new PluginClassLoader(new URL[] { agentJarFile.toURI().toURL() },
-                        this.getClass().getClassLoader());
+            if(this.pluginConfig.isAppendToSystemClassLoaderSearch()){
+                JarFile agentJar = null;
+                try {
+                    agentJar = new JarFile( agentJarFile, false);
+                    verifyJarManifestMainClassIsThis(agentJarFile, agentJar);
+                    instrumentation.appendToBootstrapClassLoaderSearch(agentJar);
+                    instrumentation.appendToSystemClassLoaderSearch(agentJar);
+                    clazz =  Class.forName(className,false,null);
+                } catch (IOException e) {
+                    throw new PluginException("agentJar",e);
+                }
+            }else{
+                if (this.pluginConfig.isAppendToSystemClassLoaderSearch()) {
+                    this.instrumentation.appendToSystemClassLoaderSearch(new JarFile(agentJarFile));
+                    this.parentClassLoader = ClassLoader.getSystemClassLoader();
+                } else {
+                    this.parentClassLoader = new PluginClassLoader(new URL[] { agentJarFile.toURI().toURL() },
+                            this.getClass().getClassLoader());
+                }
+
+                clazz = parentClassLoader.loadClass(className);
             }
 
-            clazz = parentClassLoader.loadClass(className);
 
             // 反射调用启动
             Method method = clazz.getMethod(methodName, String.class, Instrumentation.class);
@@ -115,6 +130,18 @@ public void start() throws PluginException {
 
     }
 
+    private static void verifyJarManifestMainClassIsThis(File jarFile, JarFile agentJar)
+            throws IOException {
+        Manifest manifest = agentJar.getManifest();
+        if (manifest.getMainAttributes().getValue("Premain-Class") == null) {
+            throw new IllegalStateException(
+                    "The agent was not installed, because the agent was found in '"
+                            + jarFile
+                            + "', which doesn't contain a Premain-Class manifest attribute. Make sure that you"
+                            + " haven't included the agent jar file inside of an application uber jar.");
+        }
+    }
+
     @Override
     public void stop() throws PluginException {
         // TODO Auto-generated method stub
diff --git a/one-java-agent-plugin/src/main/java/io/oneagent/plugin/config/TraditionalPluginConfigImpl.java b/one-java-agent-plugin/src/main/java/io/oneagent/plugin/config/TraditionalPluginConfigImpl.java
index 7556cf0..71e0215 100644
--- a/one-java-agent-plugin/src/main/java/io/oneagent/plugin/config/TraditionalPluginConfigImpl.java
+++ b/one-java-agent-plugin/src/main/java/io/oneagent/plugin/config/TraditionalPluginConfigImpl.java
@@ -23,6 +23,8 @@ public class TraditionalPluginConfigImpl extends PluginConfigImpl {
 
     private boolean appendToSystemClassLoaderSearch;
 
+    private boolean appendToBootstrapClassLoaderSearch;
+
     private String agentArgs;
 
 
@@ -37,6 +39,8 @@ public TraditionalPluginConfigImpl(Properties globalProperties, Properties plugi
 
         this.appendToSystemClassLoaderSearch = this.propertyResolver.getProperty("appendToSystemClassLoaderSearch", Boolean.class, Boolean.TRUE);
 
+        this.appendToBootstrapClassLoaderSearch = this.propertyResolver.getProperty("appendToBootstrapClassLoaderSearch", Boolean.class, Boolean.FALSE);
+
     }
 
 
@@ -48,6 +52,10 @@ public boolean isAppendToSystemClassLoaderSearch() {
         return appendToSystemClassLoaderSearch;
     }
 
+    public boolean isAppendToBootstrapClassLoaderSearch() {
+        return appendToBootstrapClassLoaderSearch;
+    }
+
     public String getAgentArgs() {
         return agentArgs;
     }