Add option to disable instrumentation.

src/main/java/com/zaxxer/hikari/HikariConfig.java

@@ -51,6 +51,8 @@ public final class HikariConfig implements HikariConfigMBean
 
     private Properties driverProperties;
 
+    private boolean isUseInstrumentation;
+
     /**
      * Default constructor
      */
@@ -65,6 +67,7 @@ public final class HikariConfig implements HikariConfigMBean
         idleTimeout = TimeUnit.MINUTES.toMillis(10);
         isAutoCommit = true;
         isJdbc4connectionTest = true;
+        isUseInstrumentation = true;
         minPoolSize = 10;
         maxPoolSize = 60;
         maxLifetime = TimeUnit.MINUTES.toMillis(30);
@@ -240,6 +243,16 @@ public final class HikariConfig implements HikariConfigMBean
         this.leakDetectionThreshold = leakDetectionThresholdMs; 
     }
 
+    public boolean isUseInstrumentation()
+    {
+        return isUseInstrumentation;
+    }
+
+    public void setUseInstrumentation(boolean useInstrumentation)
+    {
+        this.isUseInstrumentation = useInstrumentation;
+    }
+
     /** {@inheritDoc} */
     public long getMaxLifetime()
     {

src/main/java/com/zaxxer/hikari/HikariPool.java

@@ -80,10 +80,10 @@ public final class HikariPool implements HikariPoolMBean
 
         try
         {
-            delegationProxies = !AgentRegistrationElf.loadTransformerAgent(configuration.getDataSourceClassName());
+            delegationProxies = !configuration.isUseInstrumentation() || !AgentRegistrationElf.loadTransformerAgent(configuration.getDataSourceClassName());
             if (delegationProxies)
             {
-                LOGGER.info("Falling back to Javassist delegate-based proxies.");
+                LOGGER.info("Using Javassist delegate-based proxies.");
             }
             
             Class<?> clazz = ClassLoaderUtils.loadClass(configuration.getDataSourceClassName());