diff --git a/src/main/java/com/profiler/interceptor/bci/JavaAssistClass.java b/src/main/java/com/profiler/interceptor/bci/JavaAssistClass.java
index c4ba4d5c5..241d6fe8c 100644
--- a/src/main/java/com/profiler/interceptor/bci/JavaAssistClass.java
+++ b/src/main/java/com/profiler/interceptor/bci/JavaAssistClass.java
@@ -428,7 +428,9 @@ public class JavaAssistClass implements InstrumentClass {
     @Override
     public byte[] toBytecode() {
         try {
-            return ctClass.toBytecode();
+            byte[] bytes = ctClass.toBytecode();
+            ctClass.detach();
+            return bytes;
         } catch (IOException e) {
             logger.log(Level.INFO, "IoException class:" + ctClass.getName() + " " + e.getMessage(), e);
         } catch (CannotCompileException e) {
diff --git a/src/main/java/com/profiler/modifier/db/dbcp/DBCPBasicDataSourceModifier.java b/src/main/java/com/profiler/modifier/db/dbcp/DBCPBasicDataSourceModifier.java
index 603010a0d..a2e8d7268 100644
--- a/src/main/java/com/profiler/modifier/db/dbcp/DBCPBasicDataSourceModifier.java
+++ b/src/main/java/com/profiler/modifier/db/dbcp/DBCPBasicDataSourceModifier.java
@@ -39,8 +39,9 @@ public class DBCPBasicDataSourceModifier extends AbstractModifier {
             updateGetConnectionMethod(cc);
 
             printClassConvertComplete(javassistClassName);
-
-            return cc.toBytecode();
+            byte[] bytes = cc.toBytecode();
+            cc.detach();
+            return bytes;
         } catch (Exception e) {
             if (logger.isLoggable(Level.WARNING)) {
                 logger.log(Level.WARNING, e.getMessage(), e);