src/java.sql/share/classes/java/sql/SQLException.java
author alanb
Tue, 15 May 2018 09:33:02 +0100
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8203059: (so) Closing a socket channel registered with Selector and with SO_LINGER set to 0 does not reset connection Reviewed-by: chegar
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/*
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 * Copyright (c) 1996, 2014, 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.sql;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
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/**
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 * <P>An exception that provides information on a database access
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 * error or other errors.
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 *
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 * <P>Each <code>SQLException</code> provides several kinds of information:
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 * <UL>
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 *   <LI> a string describing the error.  This is used as the Java Exception
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 *       message, available via the method <code>getMessage</code>.
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 *   <LI> a "SQLstate" string, which follows either the XOPEN SQLstate conventions
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 *        or the SQL:2003 conventions.
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 *       The values of the SQLState string are described in the appropriate spec.
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 *       The <code>DatabaseMetaData</code> method <code>getSQLStateType</code>
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 *       can be used to discover whether the driver returns the XOPEN type or
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 *       the SQL:2003 type.
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 *   <LI> an integer error code that is specific to each vendor.  Normally this will
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 *       be the actual error code returned by the underlying database.
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 *   <LI> a chain to a next Exception.  This can be used to provide additional
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 *       error information.
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 *   <LI> the causal relationship, if any for this <code>SQLException</code>.
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 * </UL>
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 *
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 * @since 1.1
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 */
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public class SQLException extends java.lang.Exception
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                          implements Iterable<Throwable> {
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    /**
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     *  Constructs a <code>SQLException</code> object with a given
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     * <code>reason</code>, <code>SQLState</code>  and
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     * <code>vendorCode</code>.
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     *
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     * The <code>cause</code> is not initialized, and may subsequently be
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     * initialized by a call to the
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     * {@link Throwable#initCause(java.lang.Throwable)} method.
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     *
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     * @param reason a description of the exception
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     * @param SQLState an XOPEN or SQL:2003 code identifying the exception
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     * @param vendorCode a database vendor-specific exception code
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     */
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    public SQLException(String reason, String SQLState, int vendorCode) {
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        super(reason);
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        this.SQLState = SQLState;
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        this.vendorCode = vendorCode;
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        if (!(this instanceof SQLWarning)) {
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            if (DriverManager.getLogWriter() != null) {
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                DriverManager.println("SQLState(" + SQLState +
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                                                ") vendor code(" + vendorCode + ")");
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                printStackTrace(DriverManager.getLogWriter());
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            }
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        }
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    }
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    /**
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     * Constructs a <code>SQLException</code> object with a given
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     * <code>reason</code> and <code>SQLState</code>.
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     *
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     * The <code>cause</code> is not initialized, and may subsequently be
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     * initialized by a call to the
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     * {@link Throwable#initCause(java.lang.Throwable)} method. The vendor code
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     * is initialized to 0.
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     *
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     * @param reason a description of the exception
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     * @param SQLState an XOPEN or SQL:2003 code identifying the exception
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     */
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    public SQLException(String reason, String SQLState) {
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        super(reason);
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        this.SQLState = SQLState;
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        this.vendorCode = 0;
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        if (!(this instanceof SQLWarning)) {
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            if (DriverManager.getLogWriter() != null) {
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                printStackTrace(DriverManager.getLogWriter());
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                DriverManager.println("SQLException: SQLState(" + SQLState + ")");
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            }
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        }
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    }
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    /**
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     *  Constructs a <code>SQLException</code> object with a given
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     * <code>reason</code>. The  <code>SQLState</code>  is initialized to
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     * <code>null</code> and the vendor code is initialized to 0.
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     *
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     * The <code>cause</code> is not initialized, and may subsequently be
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     * initialized by a call to the
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     * {@link Throwable#initCause(java.lang.Throwable)} method.
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     *
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     * @param reason a description of the exception
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     */
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    public SQLException(String reason) {
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        super(reason);
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        this.SQLState = null;
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        this.vendorCode = 0;
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        if (!(this instanceof SQLWarning)) {
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            if (DriverManager.getLogWriter() != null) {
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                printStackTrace(DriverManager.getLogWriter());
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            }
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        }
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    }
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    /**
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     * Constructs a <code>SQLException</code> object.
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     * The <code>reason</code>, <code>SQLState</code> are initialized
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     * to <code>null</code> and the vendor code is initialized to 0.
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     *
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     * The <code>cause</code> is not initialized, and may subsequently be
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     * initialized by a call to the
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     * {@link Throwable#initCause(java.lang.Throwable)} method.
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     *
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     */
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    public SQLException() {
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        super();
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        this.SQLState = null;
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        this.vendorCode = 0;
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        if (!(this instanceof SQLWarning)) {
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            if (DriverManager.getLogWriter() != null) {
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                printStackTrace(DriverManager.getLogWriter());
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            }
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        }
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    }
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    /**
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     *  Constructs a <code>SQLException</code> object with a given
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     * <code>cause</code>.
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     * The <code>SQLState</code> is initialized
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     * to <code>null</code> and the vendor code is initialized to 0.
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     * The <code>reason</code>  is initialized to <code>null</code> if
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     * <code>cause==null</code> or to <code>cause.toString()</code> if
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     * <code>cause!=null</code>.
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     *
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     * @param cause the underlying reason for this <code>SQLException</code>
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     * (which is saved for later retrieval by the <code>getCause()</code> method);
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     * may be null indicating the cause is non-existent or unknown.
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     * @since 1.6
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     */
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    public SQLException(Throwable cause) {
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        super(cause);
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        if (!(this instanceof SQLWarning)) {
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            if (DriverManager.getLogWriter() != null) {
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                printStackTrace(DriverManager.getLogWriter());
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            }
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        }
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    }
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    /**
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     * Constructs a <code>SQLException</code> object with a given
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     * <code>reason</code> and  <code>cause</code>.
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     * The <code>SQLState</code> is  initialized to <code>null</code>
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     * and the vendor code is initialized to 0.
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     *
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     * @param reason a description of the exception.
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     * @param cause the underlying reason for this <code>SQLException</code>
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     * (which is saved for later retrieval by the <code>getCause()</code> method);
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     * may be null indicating the cause is non-existent or unknown.
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     * @since 1.6
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     */
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    public SQLException(String reason, Throwable cause) {
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        super(reason,cause);
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        if (!(this instanceof SQLWarning)) {
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            if (DriverManager.getLogWriter() != null) {
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                    printStackTrace(DriverManager.getLogWriter());
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            }
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        }
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    }
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    /**
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     * Constructs a <code>SQLException</code> object with a given
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     * <code>reason</code>, <code>SQLState</code> and  <code>cause</code>.
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     * The vendor code is initialized to 0.
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     *
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     * @param reason a description of the exception.
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     * @param sqlState an XOPEN or SQL:2003 code identifying the exception
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     * @param cause the underlying reason for this <code>SQLException</code>
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     * (which is saved for later retrieval by the
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     * <code>getCause()</code> method); may be null indicating
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     *     the cause is non-existent or unknown.
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     * @since 1.6
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     */
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    public SQLException(String reason, String sqlState, Throwable cause) {
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        super(reason,cause);
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        this.SQLState = sqlState;
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        this.vendorCode = 0;
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        if (!(this instanceof SQLWarning)) {
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            if (DriverManager.getLogWriter() != null) {
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                printStackTrace(DriverManager.getLogWriter());
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                DriverManager.println("SQLState(" + SQLState + ")");
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            }
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        }
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    }
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    /**
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     * Constructs a <code>SQLException</code> object with a given
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     * <code>reason</code>, <code>SQLState</code>, <code>vendorCode</code>
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     * and  <code>cause</code>.
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     *
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     * @param reason a description of the exception
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     * @param sqlState an XOPEN or SQL:2003 code identifying the exception
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     * @param vendorCode a database vendor-specific exception code
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     * @param cause the underlying reason for this <code>SQLException</code>
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     * (which is saved for later retrieval by the <code>getCause()</code> method);
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     * may be null indicating the cause is non-existent or unknown.
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     * @since 1.6
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     */
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    public SQLException(String reason, String sqlState, int vendorCode, Throwable cause) {
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        super(reason,cause);
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        this.SQLState = sqlState;
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        this.vendorCode = vendorCode;
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        if (!(this instanceof SQLWarning)) {
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            if (DriverManager.getLogWriter() != null) {
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                DriverManager.println("SQLState(" + SQLState +
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                                                ") vendor code(" + vendorCode + ")");
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                printStackTrace(DriverManager.getLogWriter());
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            }
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        }
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    }
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    /**
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     * Retrieves the SQLState for this <code>SQLException</code> object.
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     *
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     * @return the SQLState value
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     */
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    public String getSQLState() {
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        return (SQLState);
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    }
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    /**
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     * Retrieves the vendor-specific exception code
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     * for this <code>SQLException</code> object.
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     *
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     * @return the vendor's error code
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     */
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    public int getErrorCode() {
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        return (vendorCode);
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    }
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    /**
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     * Retrieves the exception chained to this
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     * <code>SQLException</code> object by setNextException(SQLException ex).
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     *
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     * @return the next <code>SQLException</code> object in the chain;
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     *         <code>null</code> if there are none
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     * @see #setNextException
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     */
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    public SQLException getNextException() {
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        return (next);
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    }
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    /**
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     * Adds an <code>SQLException</code> object to the end of the chain.
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     *
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     * @param ex the new exception that will be added to the end of
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     *            the <code>SQLException</code> chain
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     * @see #getNextException
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     */
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    public void setNextException(SQLException ex) {
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        SQLException current = this;
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        for(;;) {
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            SQLException next=current.next;
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            if (next != null) {
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                current = next;
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                continue;
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            }
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            if (nextUpdater.compareAndSet(current,null,ex)) {
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                return;
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            }
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            current=current.next;
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        }
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    }
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    /**
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     * Returns an iterator over the chained SQLExceptions.  The iterator will
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     * be used to iterate over each SQLException and its underlying cause
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     * (if any).
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     *
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     * @return an iterator over the chained SQLExceptions and causes in the proper
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     * order
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     *
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     * @since 1.6
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     */
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    public Iterator<Throwable> iterator() {
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       return new Iterator<Throwable>() {
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           SQLException firstException = SQLException.this;
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           SQLException nextException = firstException.getNextException();
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           Throwable cause = firstException.getCause();
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           public boolean hasNext() {
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               if(firstException != null || nextException != null || cause != null)
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                   return true;
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               return false;
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           }
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           public Throwable next() {
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               Throwable throwable = null;
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               if(firstException != null){
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                   throwable = firstException;
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                   firstException = null;
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               }
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               else if(cause != null){
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                   throwable = cause;
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                   cause = cause.getCause();
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               }
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               else if(nextException != null){
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                   throwable = nextException;
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                   cause = nextException.getCause();
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                   nextException = nextException.getNextException();
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               }
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               else
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                   throw new NoSuchElementException();
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               return throwable;
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           }
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           public void remove() {
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               throw new UnsupportedOperationException();
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           }
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       };
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    }
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    /**
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         * @serial
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         */
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    private String SQLState;
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        /**
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         * @serial
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         */
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    private int vendorCode;
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        /**
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         * @serial
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         */
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    private volatile SQLException next;
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    private static final AtomicReferenceFieldUpdater<SQLException,SQLException> nextUpdater =
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            AtomicReferenceFieldUpdater.newUpdater(SQLException.class,SQLException.class,"next");
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    private static final long serialVersionUID = 2135244094396331484L;
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}