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package java.lang;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamField;
Signals that an unexpected exception has occurred in a static initializer.
An ExceptionInInitializerError is thrown to indicate that an
exception occurred during evaluation of a static initializer or the
initializer for a static variable.
As of release 1.4, this exception has been retrofitted to conform to the general purpose exception-chaining mechanism. The "saved throwable object" that may be provided at construction time and accessed via the getException() method is now known as the cause, and may be accessed via the Throwable.getCause() method, as well as the aforementioned "legacy method."
Author: Frank Yellin Since: 1.1
/**
* Signals that an unexpected exception has occurred in a static initializer.
* An <code>ExceptionInInitializerError</code> is thrown to indicate that an
* exception occurred during evaluation of a static initializer or the
* initializer for a static variable.
*
* <p>As of release 1.4, this exception has been retrofitted to conform to
* the general purpose exception-chaining mechanism. The "saved throwable
* object" that may be provided at construction time and accessed via
* the {@link #getException()} method is now known as the <i>cause</i>,
* and may be accessed via the {@link Throwable#getCause()} method, as well
* as the aforementioned "legacy method."
*
* @author Frank Yellin
* @since 1.1
*/
public class ExceptionInInitializerError extends LinkageError {
Use serialVersionUID from JDK 1.1.X for interoperability
/**
* Use serialVersionUID from JDK 1.1.X for interoperability
*/
private static final long serialVersionUID = 1521711792217232256L;
Constructs an ExceptionInInitializerError with
null as its detail message string and with no saved
throwable object.
A detail message is a String that describes this particular exception.
/**
* Constructs an <code>ExceptionInInitializerError</code> with
* <code>null</code> as its detail message string and with no saved
* throwable object.
* A detail message is a String that describes this particular exception.
*/
public ExceptionInInitializerError() {
initCause(null); // Disallow subsequent initCause
}
Constructs a new ExceptionInInitializerError class by
saving a reference to the Throwable object thrown for later retrieval by the getException() method. The detail message string is set to null.
Params: - thrown – The exception thrown
/**
* Constructs a new <code>ExceptionInInitializerError</code> class by
* saving a reference to the <code>Throwable</code> object thrown for
* later retrieval by the {@link #getException()} method. The detail
* message string is set to <code>null</code>.
*
* @param thrown The exception thrown
*/
public ExceptionInInitializerError(Throwable thrown) {
super(null, thrown); // Disallow subsequent initCause
}
Constructs an ExceptionInInitializerError with the specified detail message string. A detail message is a String that describes this particular exception. The detail message string is saved for later retrieval by the Throwable.getMessage() method. There is no saved throwable object. Params: - s – the detail message
/**
* Constructs an {@code ExceptionInInitializerError} with the specified detail
* message string. A detail message is a String that describes this
* particular exception. The detail message string is saved for later
* retrieval by the {@link Throwable#getMessage()} method. There is no
* saved throwable object.
*
* @param s the detail message
*/
public ExceptionInInitializerError(String s) {
super(s, null); // Disallow subsequent initCause
}
Returns the exception that occurred during a static initialization that
caused this error to be created.
This method predates the general-purpose exception chaining facility. The Throwable.getCause() method is now the preferred means of obtaining this information.
Returns: the saved throwable object of this
ExceptionInInitializerError, or null
if this ExceptionInInitializerError has no saved
throwable object.
/**
* Returns the exception that occurred during a static initialization that
* caused this error to be created.
*
* <p>This method predates the general-purpose exception chaining facility.
* The {@link Throwable#getCause()} method is now the preferred means of
* obtaining this information.
*
* @return the saved throwable object of this
* <code>ExceptionInInitializerError</code>, or <code>null</code>
* if this <code>ExceptionInInitializerError</code> has no saved
* throwable object.
*/
public Throwable getException() {
return super.getCause();
}
Serializable fields for ExceptionInInitializerError.
@serialField exception Throwable
/**
* Serializable fields for ExceptionInInitializerError.
*
* @serialField exception Throwable
*/
private static final ObjectStreamField[] serialPersistentFields = {
new ObjectStreamField("exception", Throwable.class)
};
/*
* Reconstitutes the ExceptionInInitializerError instance from a stream
* and initialize the cause properly when deserializing from an older
* version.
*
* The getException and getCause method returns the private "exception"
* field in the older implementation and ExceptionInInitializerError::cause
* was set to null.
*/
private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException {
ObjectInputStream.GetField fields = s.readFields();
Throwable exception = (Throwable) fields.get("exception", null);
if (exception != null) {
setCause(exception);
}
}
/*
* To maintain compatibility with older implementation, write a serial
* "exception" field with the cause as the value.
*/
private void writeObject(ObjectOutputStream out) throws IOException {
ObjectOutputStream.PutField fields = out.putFields();
fields.put("exception", super.getCause());
out.writeFields();
}
}