142 lines
5.4 KiB
Java
142 lines
5.4 KiB
Java
/*
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* Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang.reflect;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.ObjectStreamField;
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import jdk.internal.access.SharedSecrets;
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/**
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* Thrown by a method invocation on a proxy instance if its invocation
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* handler's {@link InvocationHandler#invoke invoke} method throws a
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* checked exception (a {@code Throwable} that is not assignable
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* to {@code RuntimeException} or {@code Error}) that
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* is not assignable to any of the exception types declared in the
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* {@code throws} clause of the method that was invoked on the
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* proxy instance and dispatched to the invocation handler.
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*
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* <p>An {@code UndeclaredThrowableException} instance contains
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* the undeclared checked exception that was thrown by the invocation
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* handler, and it can be retrieved with the
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* {@code getUndeclaredThrowable()} method.
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* {@code UndeclaredThrowableException} extends
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* {@code RuntimeException}, so it is an unchecked exception
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* that wraps a checked exception.
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*
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* <p>As of release 1.4, this exception has been retrofitted to
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* conform to the general purpose exception-chaining mechanism. The
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* "undeclared checked exception that was thrown by the invocation
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* handler" that may be provided at construction time and accessed via
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* the {@link #getUndeclaredThrowable()} method is now known as the
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* <i>cause</i>, and may be accessed via the {@link
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* Throwable#getCause()} method, as well as the aforementioned "legacy
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* method."
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*
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* @author Peter Jones
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* @see InvocationHandler
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* @since 1.3
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*/
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public class UndeclaredThrowableException extends RuntimeException {
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@java.io.Serial
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static final long serialVersionUID = 330127114055056639L;
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/**
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* Constructs an {@code UndeclaredThrowableException} with the
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* specified {@code Throwable}.
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*
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* @param undeclaredThrowable the undeclared checked exception
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* that was thrown
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*/
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public UndeclaredThrowableException(Throwable undeclaredThrowable) {
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super(null, undeclaredThrowable); // Disallow initCause
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}
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/**
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* Constructs an {@code UndeclaredThrowableException} with the
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* specified {@code Throwable} and a detail message.
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*
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* @param undeclaredThrowable the undeclared checked exception
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* that was thrown
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* @param s the detail message
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*/
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public UndeclaredThrowableException(Throwable undeclaredThrowable,
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String s)
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{
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super(s, undeclaredThrowable); // Disallow initCause
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}
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/**
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* Returns the {@code Throwable} instance wrapped in this
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* {@code UndeclaredThrowableException}, which may be {@code null}.
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*
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* <p>This method predates the general-purpose exception chaining facility.
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* The {@link Throwable#getCause()} method is now the preferred means of
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* obtaining this information.
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*
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* @return the undeclared checked exception that was thrown
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*/
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public Throwable getUndeclaredThrowable() {
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return super.getCause();
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}
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/**
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* Serializable fields for UndeclaredThrowableException.
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*
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* @serialField undeclaredThrowable Throwable
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*/
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@java.io.Serial
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private static final ObjectStreamField[] serialPersistentFields = {
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new ObjectStreamField("undeclaredThrowable", Throwable.class)
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};
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/*
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* Reconstitutes the UndeclaredThrowableException instance from a stream
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* and initialize the cause properly when deserializing from an older
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* version.
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*/
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@java.io.Serial
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private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException {
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ObjectInputStream.GetField fields = s.readFields();
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Throwable exception = (Throwable) fields.get("undeclaredThrowable", null);
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if (exception != null) {
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SharedSecrets.getJavaLangAccess().setCause(this, exception);
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}
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}
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/*
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* To maintain compatibility with older implementation, write a serial
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* "ex" field with the cause as the value.
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*/
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@java.io.Serial
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private void writeObject(ObjectOutputStream out) throws IOException {
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ObjectOutputStream.PutField fields = out.putFields();
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fields.put("undeclaredThrowable", super.getCause());
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out.writeFields();
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}
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}
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