Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/lib/Drupal/Component/Plugin/Exception/ContextException.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Plugin\Exception\ContextException.
+ */
+
+namespace Drupal\Component\Plugin\Exception;
+
+/**
+ * An exception class to be thrown for context plugin exceptions.
+ */
+class ContextException extends \Exception implements ExceptionInterface { }

core/lib/Drupal/Component/Plugin/Exception/ExceptionInterface.php

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+<?php
+/**
+ * @file
+ * Contains \Drupal\Component\Plugin\Exception\ExceptionInterface.
+ */
+
+namespace Drupal\Component\Plugin\Exception;
+
+/**
+ * Exception interface for all exceptions thrown by the Plugin component.
+ */
+interface ExceptionInterface { }

core/lib/Drupal/Component/Plugin/Exception/InvalidDecoratedMethod.php

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+<?php
+/**
+ * @file
+ * Contains \Drupal\Component\Plugin\Exception\InvalidDecoratedMethod.
+ */
+
+namespace Drupal\Component\Plugin\Exception;
+
+use Drupal\Component\Plugin\Exception\ExceptionInterface;
+use \BadMethodCallException;
+
+/**
+ * Exception thrown when a decorator's _call() method is triggered, but the
+ * decorated object does not contain the requested method.
+ *
+ */
+class InvalidDecoratedMethod extends BadMethodCallException implements ExceptionInterface { }

core/lib/Drupal/Component/Plugin/Exception/InvalidDeriverException.php

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+<?php
+/**
+ * @file
+ * Contains \Drupal\Component\Plugin\Exception\InvalidDeriverException.
+ */
+
+namespace Drupal\Component\Plugin\Exception;
+
+/**
+ * Exception to be thrown if a plugin tries to use an invalid deriver.
+ */
+class InvalidDeriverException extends PluginException { }

core/lib/Drupal/Component/Plugin/Exception/InvalidPluginDefinitionException.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException.
+ */
+
+namespace Drupal\Component\Plugin\Exception;
+
+/**
+ * Defines a class for invalid plugin definition exceptions.
+ */
+class InvalidPluginDefinitionException extends PluginException {
+
+  /**
+   * The plugin ID of the mapper.
+   *
+   * @var string
+   */
+  protected $pluginId;
+
+  /**
+   * Constructs a InvalidPluginDefinitionException.
+   *
+   * @param string $plugin_id
+   *   The plugin ID of the mapper.
+   *
+   * @see \Exception for the remaining parameters.
+   */
+  public function __construct($plugin_id, $message = '', $code = 0, \Exception $previous = NULL) {
+    $this->pluginId = $plugin_id;
+    parent::__construct($message, $code, $previous);
+  }
+
+  /**
+   * Gets the plugin ID of the mapper that raised the exception.
+   *
+   * @return string
+   *   The plugin ID.
+   */
+  public function getPluginId() {
+    return $this->pluginId;
+  }
+
+}

core/lib/Drupal/Component/Plugin/Exception/MapperExceptionInterface.php

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+<?php
+/**
+ * @file
+ * Contains \Drupal\Component\Plugin\Exception\MapperExceptionInterface.
+ *
+ * Base exception interface for grouping mapper exceptions.
+ */
+
+namespace Drupal\Component\Plugin\Exception;
+
+/**
+ * Extended interface for exceptions thrown specifically by the Mapper subsystem
+ * within the Plugin component.
+ */
+interface MapperExceptionInterface extends ExceptionInterface { }

core/lib/Drupal/Component/Plugin/Exception/PluginException.php

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+<?php
+/**
+ * @file
+ * Contains \Drupal\Component\Plugin\Exception\PluginException.
+ */
+
+namespace Drupal\Component\Plugin\Exception;
+
+/**
+ * Generic Plugin exception class to be thrown when no more specific class
+ * is applicable.
+ */
+class PluginException extends \Exception implements ExceptionInterface { }

core/lib/Drupal/Component/Plugin/Exception/PluginNotFoundException.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Plugin\Exception\PluginNotFoundException.
+ */
+
+namespace Drupal\Component\Plugin\Exception;
+
+/**
+ * Plugin exception class to be thrown when a plugin ID could not be found.
+ */
+class PluginNotFoundException extends PluginException {
+
+  /**
+   * Construct an PluginNotFoundException exception.
+   *
+   * @param string $plugin_id
+   *   The plugin ID that was not found.
+   *
+   * @see \Exception for remaining parameters.
+   */
+  public function __construct($plugin_id, $message = '', $code = 0, \Exception $previous = NULL) {
+    if (empty($message)) {
+      $message = sprintf("Plugin ID '%s' was not found.", $plugin_id);
+    }
+    parent::__construct($message, $code, $previous);
+  }
+
+}