/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.dao;

import org.springframework.core.NestedRuntimeException;
import org.springframework.lang.Nullable;

/**
 * Root of the hierarchy of data access exceptions discussed in
 * <a href="https://www.amazon.com/exec/obidos/tg/detail/-/0764543857/">Expert One-On-One J2EE Design and Development</a>.
 * Please see Chapter 9 of this book for detailed discussion of the
 * motivation for this package.
 *
 * <p>This exception hierarchy aims to let user code find and handle the
 * kind of error encountered without knowing the details of the particular
 * data access API in use (e.g. JDBC). Thus, it is possible to react to an
 * optimistic locking failure without knowing that JDBC is being used.
 *
 * <p>As this class is a runtime exception, there is no need for user code
 * to catch it or subclasses if any error is to be considered fatal
 * (the usual case).
 *
 * @author Rod Johnson
 */
@SuppressWarnings("serial")
public abstract class DataAccessException extends NestedRuntimeException {

	/**
	 * Constructor for DataAccessException.
	 * @param msg the detail message
	 */
	public DataAccessException(String msg) {
		super(msg);
	}

	/**
	 * Constructor for DataAccessException.
	 * @param msg the detail message
	 * @param cause the root cause (usually from using an underlying
	 * data access API such as JDBC)
	 */
	public DataAccessException(@Nullable String msg, @Nullable Throwable cause) {
		super(msg, cause);
	}

}
