content: /*
   * 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
   *
   *      http://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="http://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 a underlying
  	 * data access API such as JDBC)
  	 */
  	public DataAccessException(@Nullable String msg, @Nullable Throwable cause) {
  		super(msg, cause);
  	}
  
  }
  