From ab71ced8c3b33adc4272411f27b775d8ec02f01a Mon Sep 17 00:00:00 2001
From: Paul Pearcy <paul.pearcy@blackboard.com>
Date: Wed, 31 Oct 2018 00:49:45 -0400
Subject: [PATCH] Expose the stacktrace created when connection is aquired
 during leak detection. This is useful for external leak detection logging

---
 .../com/zaxxer/hikari/pool/ProxyConnection.java  | 11 +++++++++++
 .../com/zaxxer/hikari/pool/ProxyLeakTask.java    | 16 ++++++++++++++--
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/src/main/java/com/zaxxer/hikari/pool/ProxyConnection.java b/src/main/java/com/zaxxer/hikari/pool/ProxyConnection.java
index c240f2c8c..f6951401f 100644
--- a/src/main/java/com/zaxxer/hikari/pool/ProxyConnection.java
+++ b/src/main/java/com/zaxxer/hikari/pool/ProxyConnection.java
@@ -184,6 +184,17 @@ void cancelLeakTask()
       leakTask.cancel();
    }
 
+   /**
+    * Returns the stacktrace location of where the connection was acquired. If leak detection is not endabled, will
+    * return an empty array.
+    *
+    * @return Array containing StackTraceElement generated when connection was acquired
+    */
+   public StackTraceElement[] getStackTrace()
+   {
+      return leakTask.getStackTrace();
+   }
+
    private synchronized <T extends Statement> T trackStatement(final T statement)
    {
       openStatements.add(statement);
diff --git a/src/main/java/com/zaxxer/hikari/pool/ProxyLeakTask.java b/src/main/java/com/zaxxer/hikari/pool/ProxyLeakTask.java
index 1999b71e7..65789a485 100644
--- a/src/main/java/com/zaxxer/hikari/pool/ProxyLeakTask.java
+++ b/src/main/java/com/zaxxer/hikari/pool/ProxyLeakTask.java
@@ -37,8 +37,9 @@ class ProxyLeakTask implements Runnable
    private ScheduledFuture<?> scheduledFuture;
    private String connectionName;
    private Exception exception;
-   private String threadName; 
+   private String threadName;
    private boolean isLeaked;
+   private static final StackTraceElement[] NO_STACKTRACE = {};
 
    static
    {
@@ -51,6 +52,12 @@ public void run() {}
 
          @Override
          public void cancel() {}
+
+         @Override
+         public StackTraceElement[] getStackTrace()
+         {
+            return NO_STACKTRACE;
+         }
       };
    }
 
@@ -70,13 +77,18 @@ void schedule(ScheduledExecutorService executorService, long leakDetectionThresh
       scheduledFuture = executorService.schedule(this, leakDetectionThreshold, TimeUnit.MILLISECONDS);
    }
 
+   public StackTraceElement[] getStackTrace()
+   {
+      return exception.getStackTrace();
+   }
+
    /** {@inheritDoc} */
    @Override
    public void run()
    {
       isLeaked = true;
 
-      final StackTraceElement[] stackTrace = exception.getStackTrace(); 
+      final StackTraceElement[] stackTrace = exception.getStackTrace();
       final StackTraceElement[] trace = new StackTraceElement[stackTrace.length - 5];
       System.arraycopy(stackTrace, 5, trace, 0, trace.length);