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155 lines
7.4 KiB
HTML
155 lines
7.4 KiB
HTML
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>JE Exceptions</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Getting Started with Berkeley DB Java Edition" />
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<link rel="up" href="introduction.html" title="Chapter 1. Introduction to Berkeley DB Java Edition" />
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<link rel="prev" href="gettingit.html" title="Getting and Using JE" />
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<link rel="next" href="logfilesrevealed.html" title="Six Things Everyone Should Know about JE Log Files" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 12.2.7.5</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">JE Exceptions</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="gettingit.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 1. Introduction to Berkeley DB Java Edition </th>
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<td width="20%" align="right"> <a accesskey="n" href="logfilesrevealed.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="jeexceptions"></a>JE Exceptions</h2>
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</div>
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</div>
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</div>
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<p>
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Before describing the Java API usage, it is first useful to examine the
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exceptions thrown by those APIs. So, briefly, this section describes the
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exceptions that you can generally expect to encounter when writing JE
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applications. This list is not definitive. Exceptions beyond these can be
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expected, depending on the specific database activity you are performing.
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See the Javadoc for more information.
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</p>
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<p>
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All of the JE APIs throw
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<code class="classname">DatabaseException</code>.
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<a class="ulink" href="../java/com/sleepycat/je/DatabaseException.html" target="_top">DatabaseException</a> extends
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<code class="classname">java.lang.Exception</code>. Also, the following
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classes are subclasses of <code class="classname">DatabaseException</code>:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<a class="ulink" href="../java/com/sleepycat/je/DatabaseNotFoundException.html" target="_top">DatabaseNotFoundException</a>
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</p>
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<p>
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Thrown whenever an operation requires a database, and that
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database cannot be found.
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</p>
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</li>
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<li>
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<p>
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<a class="ulink" href="../java/com/sleepycat/je/DiskLimitException.html" target="_top">DiskLimitException</a>
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</p>
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<p>
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Indicates that you have reached your disk usage thresholds. Writes are
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no longer allowed when these thresholds are exceeded. The thresholds
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are set using the <a class="ulink" href="../java/com/sleepycat/je/EnvironmentConfig.html#MAX_DISK" target="_top">EnvironmentConfig.MAX_DISK</a> and <a class="ulink" href="../java/com/sleepycat/je/EnvironmentConfig.html#FREE_DISK" target="_top">EnvironmentConfig.FREE_DISK</a> properties. This exception
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can be thrown as the result of any write operation, including database
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record writes, checkpoints, and database and environment syncs.
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</p>
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<p>
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When closing the environment, this exception can be seen.
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However, the environment will still be properly closed.
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</p>
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<p>
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For information on setting these properties, see
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<a class="xref" href="diskthreshold.html" title="Setting Disk Thresholds">Setting Disk Thresholds</a>.
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</p>
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</li>
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<li>
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<p>
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<a class="ulink" href="../java/com/sleepycat/je/EnvironmentFailureException.html" target="_top">EnvironmentFailureException</a>
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</p>
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<p>
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Indicates that a failure has occurred that could impact the Environment as
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a whole. Depending on the nature of the failure, this exception might
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indicate that <a class="ulink" href="../java/com/sleepycat/je/Environment.html#close--" target="_top">Environment.close()</a> should
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be called. Use <a class="ulink" href="../java/com/sleepycat/je/Environment.html#isValid--" target="_top">Environment.isValid()</a> to
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determine if all <a class="ulink" href="../java/com/sleepycat/je/Environment.html" target="_top">Environment</a> handles must
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be reopened. If <code class="literal">true</code>, the environment can
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continue operating without being reopened.
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</p>
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</li>
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<li>
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<p>
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<a class="ulink" href="../java/com/sleepycat/je/LockConflictException.html" target="_top">LockConflictException</a>
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</p>
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<p>
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The common base class for all exceptions that result from record
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lock conflicts. Upon receiving this exception, any open cursors
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must be closed, the enclosing transaction aborted and,
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optionally, the transaction retried. Transactions are described
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in the <em class="citetitle">Berkeley DB, Java Edition Getting Started with Transaction Processing</em> guide.
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</p>
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</li>
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<li>
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<p>
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<a class="ulink" href="../java/com/sleepycat/je/LogWriteException.html" target="_top">LogWriteException</a>
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</p>
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<p>
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Thrown when an <code class="classname">IOException</code> or other failure occurs
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when writing to the JE log. This exception might be indicative of a
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full disk, although an <code class="classname">IOException</code> does not contain
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enough information to determine this definitively.
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</p>
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<p>
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This exception can be thrown as the result of any write
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operation, including database record writes, checkpoints, and
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database and environment syncs.
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</p>
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</li>
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</ul>
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</div>
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<p>
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Note that <code class="classname">DatabaseException</code> and its subclasses belong to the
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<code class="literal">com.sleepycat.je</code> package.
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</p>
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</div>
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<div class="navfooter">
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<hr />
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|||
|
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<table width="100%" summary="Navigation footer">
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|||
|
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<tr>
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|||
|
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<td width="40%" align="left"><a accesskey="p" href="gettingit.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="introduction.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="logfilesrevealed.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Getting and Using JE </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> Six Things Everyone Should Know about JE Log Files</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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