213 
 214     /**
 215      * The JVM code sets the depth of the backtrace for later retrieval
 216      */
 217     private transient int depth;
 218 
 219     // Setting this static field introduces an acceptable
 220     // initialization dependency on a few java.util classes.
 221     private static final List<Throwable> SUPPRESSED_SENTINEL = Collections.emptyList();
 222 
 223     /**
 224      * The list of suppressed exceptions, as returned by {@link
 225      * #getSuppressed()}.  The list is initialized to a zero-element
 226      * unmodifiable sentinel list.  When a serialized Throwable is
 227      * read in, if the {@code suppressedExceptions} field points to a
 228      * zero-element list, the field is reset to the sentinel value.
 229      *
 230      * @serial
 231      * @since 1.7
 232      */

 233     private List<Throwable> suppressedExceptions = SUPPRESSED_SENTINEL;
 234 
 235     /** Message for trying to suppress a null exception. */
 236     private static final String NULL_CAUSE_MESSAGE = "Cannot suppress a null exception.";
 237 
 238     /** Message for trying to suppress oneself. */
 239     private static final String SELF_SUPPRESSION_MESSAGE = "Self-suppression not permitted";
 240 
 241     /** Caption  for labeling causative exception stack traces */
 242     private static final String CAUSE_CAPTION = "Caused by: ";
 243 
 244     /** Caption for labeling suppressed exception stack traces */
 245     private static final String SUPPRESSED_CAPTION = "Suppressed: ";
 246 
 247     /**
 248      * Constructs a new throwable with {@code null} as its detail message.
 249      * The cause is not initialized, and may subsequently be initialized by a
 250      * call to {@link #initCause}.
 251      *
 252      * <p>The {@link #fillInStackTrace()} method is called to initialize

 213 
 214     /**
 215      * The JVM code sets the depth of the backtrace for later retrieval
 216      */
 217     private transient int depth;
 218 
 219     // Setting this static field introduces an acceptable
 220     // initialization dependency on a few java.util classes.
 221     private static final List<Throwable> SUPPRESSED_SENTINEL = Collections.emptyList();
 222 
 223     /**
 224      * The list of suppressed exceptions, as returned by {@link
 225      * #getSuppressed()}.  The list is initialized to a zero-element
 226      * unmodifiable sentinel list.  When a serialized Throwable is
 227      * read in, if the {@code suppressedExceptions} field points to a
 228      * zero-element list, the field is reset to the sentinel value.
 229      *
 230      * @serial
 231      * @since 1.7
 232      */
 233     @SuppressWarnings("serial") // Not statically typed as Serializable
 234     private List<Throwable> suppressedExceptions = SUPPRESSED_SENTINEL;
 235 
 236     /** Message for trying to suppress a null exception. */
 237     private static final String NULL_CAUSE_MESSAGE = "Cannot suppress a null exception.";
 238 
 239     /** Message for trying to suppress oneself. */
 240     private static final String SELF_SUPPRESSION_MESSAGE = "Self-suppression not permitted";
 241 
 242     /** Caption  for labeling causative exception stack traces */
 243     private static final String CAUSE_CAPTION = "Caused by: ";
 244 
 245     /** Caption for labeling suppressed exception stack traces */
 246     private static final String SUPPRESSED_CAPTION = "Suppressed: ";
 247 
 248     /**
 249      * Constructs a new throwable with {@code null} as its detail message.
 250      * The cause is not initialized, and may subsequently be initialized by a
 251      * call to {@link #initCause}.
 252      *
 253      * <p>The {@link #fillInStackTrace()} method is called to initialize