/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.pdfbox.contentstream.operator.state;

import java.io.IOException;

/**
 * Throw when restore is executed when the graphics stack is empty.
 */
public final class EmptyGraphicsStackException extends IOException
{
    EmptyGraphicsStackException()
    {
        super("Cannot execute restore, the graphics stack is empty");
    }
}

@@ -1028,16 +1028,141 @@
 ption%0A%7B%0A
+    /**%0A     * See https://stackoverflow.com/questions/285793/%0A     */%0A    private static final long serialVersionUID = 1L;%0A%0A
     Empt

add missing serial version id as suggested by Martin Schröder