fix: ExceptionHandler displays incorrect Exception classname

app/Views/errors/cli/error_exception.php

@@ -3,17 +3,26 @@
 use CodeIgniter\CLI\CLI;
 
 // The main Exception
-CLI::newLine();
 CLI::write('[' . get_class($exception) . ']', 'light_gray', 'red');
-CLI::newLine();
 CLI::write($message);
-CLI::newLine();
 CLI::write('at ' . CLI::color(clean_path($exception->getFile()) . ':' . $exception->getLine(), 'green'));
 CLI::newLine();
 
+$last = $exception;
+
+while ($prevException = $last->getPrevious()) {
+    $last = $prevException;
+
+    CLI::write('  Caused by:');
+    CLI::write('  [' . get_class($prevException) . ']', 'red');
+    CLI::write('  ' . $prevException->getMessage());
+    CLI::write('  at ' . CLI::color(clean_path($prevException->getFile()) . ':' . $prevException->getLine(), 'green'));
+    CLI::newLine();
+}
+
 // The backtrace
 if (defined('SHOW_DEBUG_BACKTRACE') && SHOW_DEBUG_BACKTRACE) {
-    $backtraces = $exception->getTrace();
+    $backtraces = $last->getTrace();
 
     if ($backtraces) {
         CLI::write('Backtrace:', 'green');

app/Views/errors/html/error_exception.php

@@ -44,6 +44,29 @@
         <?php endif; ?>
     </div>
 
+    <div class="container">
+        <?php
+        $last = $exception;
+
+        while ($prevException = $last->getPrevious()) {
+            $last = $prevException;
+            ?>
+
+    <pre>
+    Caused by:
+    <?= esc(get_class($prevException)), esc($prevException->getCode() ? ' #' . $prevException->getCode() : '') ?>
+
+    <?= nl2br(esc($prevException->getMessage())) ?>
+    <a href="https://www.duckduckgo.com/?q=<?= urlencode(get_class($prevException) . ' ' . preg_replace('#\'.*\'|".*"#Us', '', $prevException->getMessage())) ?>"
+       rel="noreferrer" target="_blank">search &rarr;</a>
+    <?= esc(clean_path($prevException->getFile()) . ':' . $prevException->getLine()) ?>
+    </pre>
+
+        <?php
+        }
+        ?>
+    </div>
+
     <?php if (defined('SHOW_DEBUG_BACKTRACE') && SHOW_DEBUG_BACKTRACE) : ?>
     <div class="container">
 

system/Debug/BaseExceptionHandler.php

@@ -67,7 +67,14 @@ abstract public function handle(
      */
     protected function collectVars(Throwable $exception, int $statusCode): array
     {
-        $trace = $exception->getTrace();
+        // Get the first exception.
+        $firstException = $exception;
+
+        while ($prevException = $firstException->getPrevious()) {
+            $firstException = $prevException;
+        }
+
+        $trace = $firstException->getTrace();
 
         if ($this->config->sensitiveDataInTrace !== []) {
             $trace = $this->maskSensitiveData($trace, $this->config->sensitiveDataInTrace);

system/Debug/Exceptions.php

@@ -125,22 +125,31 @@ public function exceptionHandler(Throwable $exception)
         [$statusCode, $exitCode] = $this->determineCodes($exception);
 
         if ($this->config->log === true && ! in_array($statusCode, $this->config->ignoreCodes, true)) {
-            log_message('critical', "{message}\nin {exFile} on line {exLine}.\n{trace}", [
+            log_message('critical', get_class($exception) . ": {message}\nin {exFile} on line {exLine}.\n{trace}", [
                 'message' => $exception->getMessage(),
                 'exFile'  => clean_path($exception->getFile()), // {file} refers to THIS file
                 'exLine'  => $exception->getLine(), // {line} refers to THIS line
                 'trace'   => self::renderBacktrace($exception->getTrace()),
             ]);
+
+            // Get the first exception.
+            $last = $exception;
+
+            while ($prevException = $last->getPrevious()) {
+                $last = $prevException;
+
+                log_message('critical', '[Caused by] ' . get_class($prevException) . ": {message}\nin {exFile} on line {exLine}.\n{trace}", [
+                    'message' => $prevException->getMessage(),
+                    'exFile'  => clean_path($prevException->getFile()), // {file} refers to THIS file
+                    'exLine'  => $prevException->getLine(), // {line} refers to THIS line
+                    'trace'   => self::renderBacktrace($prevException->getTrace()),
+                ]);
+            }
         }
 
         $this->request  = Services::request();
         $this->response = Services::response();
 
-        // Get the first exception.
-        while ($prevException = $exception->getPrevious()) {
-            $exception = $prevException;
-        }
-
         if (method_exists($this->config, 'handler')) {
             // Use new ExceptionHandler
             $handler = $this->config->handler($statusCode, $exception);
@@ -325,7 +334,14 @@ protected function render(Throwable $exception, int $statusCode)
      */
     protected function collectVars(Throwable $exception, int $statusCode): array
     {
-        $trace = $exception->getTrace();
+        // Get the first exception.
+        $firstException = $exception;
+
+        while ($prevException = $firstException->getPrevious()) {
+            $firstException = $prevException;
+        }
+
+        $trace = $firstException->getTrace();
 
         if ($this->config->sensitiveDataInTrace !== []) {
             $trace = $this->maskSensitiveData($trace, $this->config->sensitiveDataInTrace);

user_guide_src/source/installation/upgrade_444.rst

@@ -16,6 +16,14 @@ Please refer to the upgrade instructions corresponding to your installation meth
 Mandatory File Changes
 **********************
 
+Error Files
+===========
+
+Update the following files to show correct error messages:
+
+- app/Views/errors/cli/error_exception.php
+- app/Views/errors/html/error_exception.php
+
 ****************
 Breaking Changes
 ****************