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25 
26 package java.lang;
27 
28 /**
29  * Signals that an unexpected exception has occurred in a static initializer.
30  * An <code>ExceptionInInitializerError</code> is thrown to indicate that an
31  * exception occurred during evaluation of a static initializer or the
32  * initializer for a static variable.
33  *
34  * <p>As of release 1.4, this exception has been retrofitted to conform to
35  * the general purpose exception-chaining mechanism.  The "saved throwable
36  * object" that may be provided at construction time and accessed via
37  * the {@link #getException()} method is now known as the <i>cause</i>,
38  * and may be accessed via the {@link Throwable#getCause()} method, as well
39  * as the aforementioned "legacy method."
40  *
41  * @author  Frank Yellin
42  * @since   JDK1.1
43  */
44 public class ExceptionInInitializerError extends LinkageError {
45     /**
46      * Use serialVersionUID from JDK 1.1.X for interoperability
47      */
48     private static final long serialVersionUID = 1521711792217232256L;
49 
50     /**
51      * This field holds the exception if the
52      * ExceptionInInitializerError(Throwable thrown) constructor was
53      * used to instantiate the object
54      *
55      * @serial
56      *
57      */
58     private Throwable exception;
59 
60     /**
61      * Constructs an <code>ExceptionInInitializerError</code> with
62      * <code>null</code> as its detail message string and with no saved
63      * throwable object.
64      * A detail message is a String that describes this particular exception.
65      */
ExceptionInInitializerError()66     public ExceptionInInitializerError() {
67         initCause(null);  // Disallow subsequent initCause
68     }
69 
70     /**
71      * Constructs a new <code>ExceptionInInitializerError</code> class by
72      * saving a reference to the <code>Throwable</code> object thrown for
73      * later retrieval by the {@link #getException()} method. The detail
74      * message string is set to <code>null</code>.
75      *
76      * @param thrown The exception thrown
77      */
ExceptionInInitializerError(Throwable thrown)78     public ExceptionInInitializerError(Throwable thrown) {
79         initCause(null);  // Disallow subsequent initCause
80         this.exception = thrown;
81     }
82 
83     /**
84      * Constructs an ExceptionInInitializerError with the specified detail
85      * message string.  A detail message is a String that describes this
86      * particular exception. The detail message string is saved for later
87      * retrieval by the {@link Throwable#getMessage()} method. There is no
88      * saved throwable object.
89      *
90      *
91      * @param s the detail message
92      */
ExceptionInInitializerError(String s)93     public ExceptionInInitializerError(String s) {
94         super(s);
95         initCause(null);  // Disallow subsequent initCause
96     }
97 
98     /**
99      * Returns the exception that occurred during a static initialization that
100      * caused this error to be created.
101      *
102      * <p>This method predates the general-purpose exception chaining facility.
103      * The {@link Throwable#getCause()} method is now the preferred means of
104      * obtaining this information.
105      *
106      * @return the saved throwable object of this
107      *         <code>ExceptionInInitializerError</code>, or <code>null</code>
108      *         if this <code>ExceptionInInitializerError</code> has no saved
109      *         throwable object.
110      */
getException()111     public Throwable getException() {
112         return exception;
113     }
114 
115     /**
116      * Returns the cause of this error (the exception that occurred
117      * during a static initialization that caused this error to be created).
118      *
119      * @return  the cause of this error or <code>null</code> if the
120      *          cause is nonexistent or unknown.
121      * @since   1.4
122      */
getCause()123     public Throwable getCause() {
124         return exception;
125     }
126 }
127