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jboss-logging-tools 2.2.1-4
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<body class="article toc2 toc-left">
<div id="header">
<h1>JBoss Logging Tools</h1>
<div class="details">
<span id="author" class="author">James R. Perkins</span><br>
<span id="email" class="email">&lt;<a href="mailto:jperkins@redhat.com">jperkins@redhat.com</a>&gt;</span><br>
<span id="revnumber">version 2.2.1.Final</span>
</div>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#introduction">Introduction</a></li>
<li><a href="#getting-started">Getting Started</a></li>
<li><a href="#message-bundle-interfaces">Message Bundle Interfaces</a>
<ul class="sectlevel2">
<li><a href="#example-message-bundle">Example Message Bundle</a></li>
</ul>
</li>
<li><a href="#message-logger-interfaces">Message Logger Interfaces</a>
<ul class="sectlevel2">
<li><a href="#example-message-logger">Example Message Logger</a></li>
</ul>
</li>
<li><a href="#reports">Reports</a>
<ul class="sectlevel2">
<li><a href="#annotations">Annotations</a></li>
</ul>
</li>
<li><a href="#example-use-cases">Example Use Cases</a></li>
<li><a href="#translation-property-files">Translation Property Files</a></li>
<li><a href="#annotation-processor-options">Annotation Processor Options</a>
<ul class="sectlevel2">
<li><a href="#general">General</a></li>
<li><a href="#translation-options">Translation Options</a></li>
<li><a href="#report-options">Report Options</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="introduction"><a class="anchor" href="#introduction"></a>Introduction</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The JBoss logging tools are used to create internationalized log statements and exceptions.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="getting-started"><a class="anchor" href="#getting-started"></a>Getting Started</h2>
<div class="sectionbody">
<div class="paragraph">
<p>To get started you need to include three dependencies in your project.</p>
</div>
<table class="tableblock frame-none grid-none stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://repository.jboss.org/org/jboss/logging/jboss-logging/">JBoss Logging</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Required at compile time and runtime.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://repository.jboss.org/org/jboss/logging/jboss-logging-annotations/">JBoss Logging Annotations</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Required at compile time only.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://repository.jboss.org/org/jboss/logging/jboss-logging-processor/">JBoss Logging Processor</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Required at compile time only.</p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>If you&#8217;re using maven here is an example <code>pom.xml</code> snippet:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="xml"><span class="tag">&lt;dependencies&gt;</span>
    <span class="comment">&lt;!-- Required by the annotation processor and will be used at runtime --&gt;</span>
    <span class="tag">&lt;dependency&gt;</span>
        <span class="tag">&lt;groupId&gt;</span>org.jboss.logging<span class="tag">&lt;/groupId&gt;</span>
        <span class="tag">&lt;artifactId&gt;</span>jboss-logging<span class="tag">&lt;/artifactId&gt;</span>
    <span class="tag">&lt;/dependency&gt;</span>

    <span class="tag">&lt;dependency&gt;</span>
        <span class="tag">&lt;groupId&gt;</span>org.jboss.logging<span class="tag">&lt;/groupId&gt;</span>
        <span class="tag">&lt;artifactId&gt;</span>jboss-logging-annotations<span class="tag">&lt;/artifactId&gt;</span>
        <span class="tag">&lt;version&gt;</span>2.2.1.Final<span class="tag">&lt;/version&gt;</span>
        <span class="comment">&lt;!-- This is a compile-time dependency of this project, but is not needed at compile or runtime by other
              projects that depend on this project.--&gt;</span>
        <span class="tag">&lt;scope&gt;</span>provided<span class="tag">&lt;/scope&gt;</span>
        <span class="tag">&lt;optional&gt;</span>true<span class="tag">&lt;/optional&gt;</span>
    <span class="tag">&lt;/dependency&gt;</span>

    <span class="tag">&lt;dependency&gt;</span>
        <span class="tag">&lt;groupId&gt;</span>org.jboss.logging<span class="tag">&lt;/groupId&gt;</span>
        <span class="tag">&lt;artifactId&gt;</span>jboss-logging-processor<span class="tag">&lt;/artifactId&gt;</span>
        <span class="tag">&lt;version&gt;</span>2.2.1.Final<span class="tag">&lt;/version&gt;</span>
        <span class="comment">&lt;!-- This is a compile-time dependency of this project, but is not needed at compile or runtime by other
              projects that depend on this project.--&gt;</span>
        <span class="tag">&lt;scope&gt;</span>provided<span class="tag">&lt;/scope&gt;</span>
        <span class="tag">&lt;optional&gt;</span>true<span class="tag">&lt;/optional&gt;</span>
    <span class="tag">&lt;/dependency&gt;</span>
<span class="tag">&lt;/dependencies&gt;</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Once your project is configured you can create either a <a href="#message-bundle-interfaces">message bundle interface</a> or a <a href="#message-logger-interfaces">message logger interface</a>. For detailed information see the <a href="apidocs/index.html">JavaDocs</a> for the annotations.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="message-bundle-interfaces"><a class="anchor" href="#message-bundle-interfaces"></a>Message Bundle Interfaces</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Message bundle interfaces provide a way to internationalize exceptions or strings. A message bundle interface is
annotated with <a href="apidocs"><code>@MessageBundle</code></a>. Each method in must be annotated with <a href="apidocs"><code>@Message</code></a>
which will be used to determine the String used for either the return type or the message for the exception being
returned.</p>
</div>
<div class="paragraph">
<p>The value for a <a href="apidocs"><code>@Message</code></a> may contain an expression.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
Expressions are in the form of <code>${key:defaultValue}</code>. If the key is prefixed with <code>sys.</code> a system property is
used. If the key is prefixed with <code>env.</code> an environment variable is used. In all other cases the properties are resolved
from the <code>org.jboss.logging.tools.expressionProperties</code> path. If the key is not found in the properties the default
value will be used.
</td>
</tr>
</table>
</div>
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<i class="fa icon-important" title="Important"></i>
</td>
<td class="content">
Expressions are processed at compile time. The values will be hard-coded in the generated source files.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>The following constraints are placed on methods in a message bundle:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>The return type must be one of the follow</p>
<div class="ulist">
<ul>
<li>
<p>A <code>java.lang.String</code></p>
</li>
<li>
<p>A <code>java.lang.Throwable</code> or a subtype of <code>java.lang.Throwable</code></p>
</li>
<li>
<p>A <code>java.lang.function.Supplier</code> who&#8217;s return type fits one of the other two constraints above.</p>
</li>
</ul>
</div>
</li>
<li>
<p>The method must be annotated with <a href="apidocs"><code>@Message</code></a> or a message must be inheritable.</p>
</li>
<li>
<p>A method can have only one <a href="apidocs"><code>@Cause</code></a> parameter.</p>
</li>
<li>
<p>A method can only have one <a href="apidocs"><code>@Producer</code></a> parameter.</p>
</li>
</ul>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
A message is inheritable if the two methods have the same name and same number of format parameters.
</td>
</tr>
</table>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
A format parameter is a parameter that has no annotations or is annotated with one of the following annotations; <a href="apidocs"><code>@FormatWith</code></a>, <a href="apidocs"><code>@Pos</code></a> or <a href="apidocs"><code>@Transform</code></a>.
</td>
</tr>
</table>
</div>
<div class="sect2">
<h3 id="example-message-bundle"><a class="anchor" href="#example-message-bundle"></a>Example Message Bundle</h3>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="java"><span class="annotation">@MessageBundle</span>(projectCode = <span class="string"><span class="delimiter">&quot;</span><span class="content">CW</span><span class="delimiter">&quot;</span></span>) <i class="conum" data-value="1"></i><b>(1)</b>
<span class="directive">public</span> <span class="type">interface</span> <span class="class">ErrorMessages</span> {
    ErrorMessages MESSAGES = Messages.getBundle(ErrorMessages.class);

    <span class="annotation">@Message</span>(<span class="string"><span class="delimiter">&quot;</span><span class="content">Version %d.%d.%d.%s</span><span class="delimiter">&quot;</span></span>) <i class="conum" data-value="2"></i><b>(2)</b>
    <span class="predefined-type">String</span> version(<span class="type">int</span> major, <span class="type">int</span> minor, <span class="type">int</span> macro, <span class="predefined-type">String</span> rel);

    <span class="annotation">@Message</span>(id = <span class="integer">1</span>, value = <span class="string"><span class="delimiter">&quot;</span><span class="content">Value '%s' is invalid</span><span class="delimiter">&quot;</span></span>)
    <span class="exception">IllegalArgumentException</span> invalidValue(<span class="predefined-type">Object</span> value);

    <span class="annotation">@Message</span>(id = <span class="integer">2</span>, value = <span class="string"><span class="delimiter">&quot;</span><span class="content">Failure closing %s</span><span class="delimiter">&quot;</span></span>) <i class="conum" data-value="3"></i><b>(3)</b>
    CloseException closeFailure(<span class="annotation">@Cause</span> <span class="predefined-type">Throwable</span> cause, <span class="annotation">@Param</span> <span class="annotation">@Pos</span>(<span class="integer">1</span>) <span class="predefined-type">Closeable</span> c);

    CloseException closeFailure(<span class="annotation">@Cause</span> <span class="predefined-type">Throwable</span> cause, <span class="annotation">@Param</span> <span class="annotation">@Pos</span>(<span class="integer">1</span>) <span class="predefined-type">Closeable</span> c, <span class="annotation">@Suppressed</span> <span class="predefined-type">Throwable</span>... errors);

    <span class="annotation">@Message</span>(id = <span class="integer">3</span>, value = <span class="string"><span class="delimiter">&quot;</span><span class="content">Parameter %s cannot be null</span><span class="delimiter">&quot;</span></span>)
    Supplier&lt;<span class="predefined-type">String</span>&gt; nullParam(<span class="predefined-type">String</span> name);

    <span class="annotation">@Message</span>(id = <span class="integer">4</span>, value = <span class="string"><span class="delimiter">&quot;</span><span class="content">Operation %s failed.</span><span class="delimiter">&quot;</span></span>)
    &lt;T <span class="directive">extends</span> <span class="exception">RuntimeException</span>&gt; T operationFailed(<span class="annotation">@Producer</span> Function&lt;<span class="predefined-type">String</span>, T&gt; fn, <span class="predefined-type">String</span> name); <i class="conum" data-value="4"></i><b>(4)</b>

    &lt;T <span class="directive">extends</span> <span class="exception">RuntimeException</span>&gt; T operationFailed(<span class="annotation">@Producer</span> BiFunction&lt;<span class="predefined-type">String</span>, <span class="exception">IOException</span>, T&gt; fn, <span class="annotation">@Cause</span> <span class="exception">IOException</span> cause, <span class="predefined-type">String</span> name);
}</code></pre>
</div>
</div>
<div class="colist arabic">
<table>
<tr>
<td><i class="conum" data-value="1"></i><b>1</b></td>
<td>The <code>projectCode</code> will be prepended to messages which have an <code>id</code> specified. For example with <code>id = 1</code> the message will be prepended with <code>CW000001</code>. You can control the number padding with the <code>length</code> property on the annotation.</td>
</tr>
<tr>
<td><i class="conum" data-value="2"></i><b>2</b></td>
<td>No <code>id</code> is specified for this message which means no id will be prepended on this message.</td>
</tr>
<tr>
<td><i class="conum" data-value="3"></i><b>3</b></td>
<td>The <code>@Param</code> annotation tells the generator that the parameter should be used to construct the <code>CloseException</code>. The <code>@Pos(1)</code> annotation indicates the parameter should also be used when formatting the message.</td>
</tr>
<tr>
<td><i class="conum" data-value="4"></i><b>4</b></td>
<td>The <code>@Producer</code> annotation indicates that the <code>Function</code> should be used to create the exception being returned.</td>
</tr>
</table>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
Message bundle interfaces can also contain valid <a href="#message-logger-interfaces">message logger methods</a>.
</td>
</tr>
</table>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="message-logger-interfaces"><a class="anchor" href="#message-logger-interfaces"></a>Message Logger Interfaces</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Logger interfaces provide a way to internationalize log messages. A logger interface is an interface annotated with
<a href="apidocs"><code>@MessageLogger</code></a>. Each method in must be annotated with <a href="apidocs"><code>@Message</code></a> which will
be used to determine the message to be logged.</p>
</div>
<div class="paragraph">
<p>The value for a <a href="apidocs"><code>@Message</code></a> may contain an expression.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
Expressions are in the form of <code>${key:defaultValue}</code>. If the key is prefixed with <code>sys.</code> a system property is
used. If the key is prefixed with <code>env.</code> an environment variable is used. In all other cases the properties are resolved
from the <code>org.jboss.logging.tools.expressionProperties</code> path. If the key is not found in the properties the default
value will be used.
</td>
</tr>
</table>
</div>
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<i class="fa icon-important" title="Important"></i>
</td>
<td class="content">
Expressions are processed at compile time. The values will be hard-coded in the generated source files.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>The following constraints are placed on methods in a message logger:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>The method must have a <code>void</code> return type</p>
</li>
<li>
<p>The method must be annotated with <a href="apidocs"><code>@LogMessage</code></a></p>
</li>
<li>
<p>The method must be annotated with <a href="apidocs"><code>@Message</code></a> or a message must be inheritable.</p>
</li>
<li>
<p>A method can have only one <a href="apidocs"><code>@Cause</code></a> parameter.</p>
</li>
</ul>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
A message is inheritable if the two methods have the same name and same number of format parameters.
</td>
</tr>
</table>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
A format parameter is a parameter that has no annotations or is annotated with one of the following annotations; <a href="apidocs"><code>@FormatWith</code></a>, <a href="apidocs"><code>@Pos</code></a> or <a href="apidocs"><code>@Transform</code></a>.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>A message logger interface may also extend the <code>org.jboss.logging.BasicLogger</code>. This allows the logging interface to be usable for standard logging. For example <code>AppLogger.LOGGER.debugf("Initializing %s", this);</code></p>
</div>
<div class="sect2">
<h3 id="example-message-logger"><a class="anchor" href="#example-message-logger"></a>Example Message Logger</h3>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="java"><span class="annotation">@MessageLogger</span>(projectCode = <span class="string"><span class="delimiter">&quot;</span><span class="content">CW</span><span class="delimiter">&quot;</span></span>) <i class="conum" data-value="1"></i><b>(1)</b>
<span class="directive">public</span> <span class="type">interface</span> <span class="class">AppLogger</span> <span class="directive">extends</span> BasicLogger {

    AppLogger LOGGER = <span class="predefined-type">Logger</span>.getMessageLogger(AppLogger.class, AppLogger.class.getPackage().getName());

    <span class="annotation">@LogMessage</span>
    <span class="annotation">@Once</span> <i class="conum" data-value="2"></i><b>(2)</b>
    <span class="annotation">@Message</span>(<span class="string"><span class="delimiter">&quot;</span><span class="content">%s version %d.%d.%d.%s</span><span class="delimiter">&quot;</span></span>) <i class="conum" data-value="3"></i><b>(3)</b>
    <span class="type">void</span> appVersion(<span class="predefined-type">CharSequence</span> name, <span class="type">int</span> major, <span class="type">int</span> minor, <span class="type">int</span> macro, <span class="predefined-type">String</span> rel);

    <span class="annotation">@LogMessage</span>(level = <span class="predefined-type">Logger</span>.Level.ERROR) <i class="conum" data-value="4"></i><b>(4)</b>
    <span class="annotation">@Message</span>(id = <span class="integer">100</span>, value = <span class="string"><span class="delimiter">&quot;</span><span class="content">Failure while closing %s</span><span class="delimiter">&quot;</span></span>)
    <span class="type">void</span> closeFailure(<span class="annotation">@Cause</span> <span class="predefined-type">Throwable</span> cause, <span class="predefined-type">Object</span> obj);

    <span class="annotation">@LogMessage</span>(level = <span class="predefined-type">Logger</span>.Level.WARN)
    <span class="annotation">@Message</span>(id = <span class="integer">101</span>, value = <span class="string"><span class="delimiter">&quot;</span><span class="content">Encoding %s could not be found. Defaulting to %s.</span><span class="delimiter">&quot;</span></span>)
    <span class="type">void</span> encodingNotFound(<span class="predefined-type">String</span> encoding, <span class="predefined-type">Charset</span> dft);

    <span class="annotation">@LogMessage</span>
    <span class="annotation">@Message</span>(id = <span class="integer">102</span>, value = <span class="string"><span class="delimiter">&quot;</span><span class="content">Cache size changed to '%d'</span><span class="delimiter">&quot;</span></span>)
    <span class="type">void</span> cacheSizeChanged(<span class="annotation">@Transform</span>(Transform.TransformType.SIZE) <span class="predefined-type">Collection</span>&lt;<span class="predefined-type">String</span>&gt; c);

    <span class="annotation">@LogMessage</span>
    <span class="type">void</span> cacheSizeChanged(<span class="annotation">@Transform</span>(Transform.TransformType.SIZE) <span class="predefined-type">String</span>... array);

    <span class="annotation">@LogMessage</span>
    <span class="type">void</span> cacheSizeChanged(<span class="annotation">@Transform</span>(Transform.TransformType.SIZE) <span class="predefined-type">Map</span>&lt;<span class="predefined-type">String</span>, <span class="predefined-type">Object</span>&gt; map);
}</code></pre>
</div>
</div>
<div class="colist arabic">
<table>
<tr>
<td><i class="conum" data-value="1"></i><b>1</b></td>
<td>The <code>projectCode</code> will be prepended to messages which have an <code>id</code> specified. For example with <code>id = 100</code> the message will be prepended with <code>CW000100</code>. You can control the number padding with the <code>length</code> property on the annotation.</td>
</tr>
<tr>
<td><i class="conum" data-value="2"></i><b>2</b></td>
<td>Ensures the log message is only written once.</td>
</tr>
<tr>
<td><i class="conum" data-value="3"></i><b>3</b></td>
<td>No <code>id</code> is specified for this message which means no id will be prepended on this message.</td>
</tr>
<tr>
<td><i class="conum" data-value="4"></i><b>4</b></td>
<td>Overrides the default level to <code>ERROR</code> to indicate an error message should be logged.</td>
</tr>
</table>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="reports"><a class="anchor" href="#reports"></a>Reports</h2>
<div class="sectionbody">
<div class="paragraph">
<p>There are currently two types of reports that can be generated. The options are <code>adoc</code> or <code>asciidoc</code> for asciidoc and <code>xml</code> for XML.</p>
</div>
<div class="paragraph">
<p>The reports contain the following data:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>The formatted message id.</p>
</li>
<li>
<p>A possible link to a resolution document for the error.</p>
</li>
<li>
<p>The unformatted message.</p>
</li>
<li>
<p>The log level, if applicable.</p>
</li>
<li>
<p>The return type, if applicable.</p>
</li>
</ul>
</div>
<div class="sect2">
<h3 id="annotations"><a class="anchor" href="#annotations"></a>Annotations</h3>
<div class="paragraph">
<p>Two annotations can be used to assist withing linking resolution documents for messages.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="apidocs"><code>@BaseUrl</code></a></p>
<div class="ulist">
<ul>
<li>
<p>This annotation can be used on a type to define the base URL for linking resolution documents. This annotation is
not required for links to be created on reports.</p>
</li>
</ul>
</div>
</li>
<li>
<p><a href="apidocs"><code>@ResolutionDoc</code></a></p>
<div class="ulist">
<ul>
<li>
<p>This annotation is used to define information about the resolution document for creating links. If placed on an
interface all methods that have a defined id will have a link generated. This can also be placed individually on
the method to only generate links for specific id&#8217;s.</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="example-use-cases"><a class="anchor" href="#example-use-cases"></a>Example Use Cases</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Below are some example use case snippets from the <a href="https://github.com/jboss-logging/jboss-logging-tools/docs/src/main/java/org/jboss/logging/tools/examples">examples</a>.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="java"><span class="comment">/**
 * Writes the value of the object to the file.
 *
 * @param value the value to write, cannot be {@code null}
 *
 * @throws UncheckedIOException if an error occurs writing the data
 */</span>
<span class="directive">public</span> <span class="type">void</span> write(<span class="directive">final</span> <span class="predefined-type">Object</span> value) {
    AppLogger.LOGGER.appVersion(<span class="string"><span class="delimiter">&quot;</span><span class="content">ContentWriter</span><span class="delimiter">&quot;</span></span>, <span class="integer">1</span>, <span class="integer">0</span>, <span class="integer">0</span>, <span class="string"><span class="delimiter">&quot;</span><span class="content">Beta1</span><span class="delimiter">&quot;</span></span>); <i class="conum" data-value="1"></i><b>(1)</b>
    Objects.requireNonNull(value, ErrorMessages.MESSAGES.nullParam(<span class="string"><span class="delimiter">&quot;</span><span class="content">value</span><span class="delimiter">&quot;</span></span>)); <i class="conum" data-value="2"></i><b>(2)</b>
    write(Objects.requireNonNull(value, ErrorMessages.MESSAGES.nullParam(<span class="string"><span class="delimiter">&quot;</span><span class="content">value</span><span class="delimiter">&quot;</span></span>)).toString());
}

<span class="comment">/**
 * Writes the value to the file.
 *
 * @param value the value to write, cannot be {@code null} or an {@linkplain String#isEmpty() empty string}.
 *
 * @throws UncheckedIOException if an error occurs writing the data
 */</span>
<span class="directive">public</span> <span class="type">void</span> write(<span class="directive">final</span> <span class="predefined-type">String</span> value) {
    AppLogger.LOGGER.appVersion(<span class="string"><span class="delimiter">&quot;</span><span class="content">ContentWriter</span><span class="delimiter">&quot;</span></span>, <span class="integer">1</span>, <span class="integer">0</span>, <span class="integer">0</span>, <span class="string"><span class="delimiter">&quot;</span><span class="content">Beta1</span><span class="delimiter">&quot;</span></span>);
    <span class="keyword">if</span> (Objects.requireNonNull(value, ErrorMessages.MESSAGES.nullParam(<span class="string"><span class="delimiter">&quot;</span><span class="content">value</span><span class="delimiter">&quot;</span></span>)).isEmpty()) {
        <span class="keyword">throw</span> ErrorMessages.MESSAGES.invalidValue(value); <i class="conum" data-value="3"></i><b>(3)</b>
    }
    <span class="keyword">try</span> {
        <span class="directive">synchronized</span> (outputLock) {
            writer.write(value);
            writer.newLine();
            <span class="keyword">if</span> (autoFlush) {
                flush();
            }
        }
    } <span class="keyword">catch</span> (<span class="exception">IOException</span> e) {
        <span class="keyword">throw</span> ErrorMessages.MESSAGES.operationFailed(UncheckedIOException::<span class="keyword">new</span>, e, <span class="string"><span class="delimiter">&quot;</span><span class="content">write</span><span class="delimiter">&quot;</span></span>); <i class="conum" data-value="4"></i><b>(4)</b>
    }
}

<span class="annotation">@Override</span>
<span class="directive">public</span> <span class="type">void</span> close() {
    <span class="keyword">try</span> {
        <span class="directive">synchronized</span> (outputLock) {
            writer.close();
        }
        AppLogger.LOGGER.tracef(<span class="string"><span class="delimiter">&quot;</span><span class="content">ContentWriter %s was successfully closed.</span><span class="delimiter">&quot;</span></span>, <span class="local-variable">this</span>);
    } <span class="keyword">catch</span> (<span class="exception">Exception</span> e) {
        <span class="keyword">throw</span> ErrorMessages.MESSAGES.closeFailure(e, <span class="local-variable">this</span>);
    }
}

<span class="comment">/**
 * Safely close this writer logging any errors that occur during closing.
 */</span>
<span class="directive">public</span> <span class="type">void</span> safeClose() {
    <span class="keyword">try</span> {
        <span class="directive">synchronized</span> (outputLock) {
            writer.close();
        }
        AppLogger.LOGGER.tracef(<span class="string"><span class="delimiter">&quot;</span><span class="content">ContentWriter %s was successfully closed.</span><span class="delimiter">&quot;</span></span>, <span class="local-variable">this</span>);
    } <span class="keyword">catch</span> (<span class="exception">Exception</span> e) {
        AppLogger.LOGGER.closeFailure(e, <span class="local-variable">this</span>); <i class="conum" data-value="5"></i><b>(5)</b>
    }
}</code></pre>
</div>
</div>
<div class="colist arabic">
<table>
<tr>
<td><i class="conum" data-value="1"></i><b>1</b></td>
<td>Logs the application version. Note this uses the <a href="apidocs">@Once</a> annotation to indicate this should only be logged once regardless of which <code>write</code> method is used.</td>
</tr>
<tr>
<td><i class="conum" data-value="2"></i><b>2</b></td>
<td>The <code>ErrorMessages.nullParam()</code> returns a <code>java.lang.function.Supplier</code>. This allows the message to be lazily formatted only if the <code>value</code> is <code>null</code>.</td>
</tr>
<tr>
<td><i class="conum" data-value="3"></i><b>3</b></td>
<td>Throws a message if the <code>value</code> is an empty string.</td>
</tr>
<tr>
<td><i class="conum" data-value="4"></i><b>4</b></td>
<td>Uses a <code>java.lang.function.BiFunction</code> to create a new <code>UncheckedIOException</code> with the caught exception set as the cause.</td>
</tr>
<tr>
<td><i class="conum" data-value="5"></i><b>5</b></td>
<td>Logs the caught exception instead of throwing a new exception.</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="translation-property-files"><a class="anchor" href="#translation-property-files"></a>Translation Property Files</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The translation properties files must exist in the same directory structure as the interface. The name of the properties file <code>InterfaceName.i18n_language_country_variant.properties</code>. For example if you have a class named <code>org.jboss.logging.tools.examples.ErrorMessages</code> and you want to translate this into French you create a properties file called <code>ErrorMessages.i18n_fr.properties</code> in a directory <code>org/jboss/logging/tools/examples</code>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="annotation-processor-options"><a class="anchor" href="#annotation-processor-options"></a>Annotation Processor Options</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You can pass options to an annotation processor with the <code>-A</code> compiler option. For example to disable generating the <code>@Generated</code> annotation from being placed on the generated source files you would pass <code>-Aorg.jboss.logging.tools.addGeneratedAnnotation=false</code> to the compiler command.</p>
</div>
<div class="sect2">
<h3 id="general"><a class="anchor" href="#general"></a>General</h3>
<table class="tableblock frame-none grid-none stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Option</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>debug</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This option turns on debug logging for the processor</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>org.jboss.logging.tools.expressionProperties</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This option allows you to define a path where, at compile-time, expressions in messages can be resolved.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>org.jboss.logging.tools.addGeneratedAnnotation</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">If set to <code>false</code> the <code>@Generated</code> annotation will not be placed on the generated source files. The default is <code>true</code>.</p></td>
</tr>
</tbody>
</table>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
In Java 9 the <code>@javax.annotation.Generated</code> was moved to <code>@javax.annotation.processor.Generated</code>. The processor attempts to determine which annotation to use by attempting to find the <code>@javax.annotation.Generated</code> first. If it fails the <code>@javax.annotation.processor.Generated</code> is attempted. If neither can be found no annotation will be placed on the generated implementations.
</td>
</tr>
</table>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
Expressions are in the form of <code>${key:defaultValue}</code>. If the key is prefixed with <code>sys.</code> a system property is
used. If the key is prefixed with <code>env.</code> an environment variable is used. In all other cases the properties are resolved
from the <code>org.jboss.logging.tools.expressionProperties</code> path. If the key is not found in the properties the default
value will be used.
</td>
</tr>
</table>
</div>
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<i class="fa icon-important" title="Important"></i>
</td>
<td class="content">
Expressions are processed at compile time. The values will be hard-coded in the generated source files.
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="translation-options"><a class="anchor" href="#translation-options"></a>Translation Options</h3>
<table class="tableblock frame-none grid-none stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Option</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>translationsFilesPath</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The base path for the translated properties files. This defaults to the location where new class files are placed.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>skipTranslations</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">If set to <code>true</code> source files with the translated tet will not be generated. The default is <code>false</code>.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>generatedTranslationFilesPath</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">If defined this indicates the path a skeleton file should be generated for the interface. The generated skeleton file will be placed in a directory that matches the package with a name that matches the interface with a <code>.i18n_locale_COUNTRY_VARIANT.properties</code> suffix.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>org.jboss.logging.tools.level</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Sets the maximum level to include in the generated skeleton files. For example if set to <code>INFO</code> the skeleton files will not contain any properties where the log level was set to <code>DEBUG</code> or <code>TRACE</code>.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>org.jboss.logging.tools.generated.skip.index</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">By default when generating a skeleton translation file an index will be appended to the format pattern. For example <code>Example %s and %d</code> becomes <code>Example %1$s and %2$d</code>. This option allows this behavior to be disabled.</p></td>
</tr>
</tbody>
</table>
</div>
<div class="sect2">
<h3 id="report-options"><a class="anchor" href="#report-options"></a>Report Options</h3>
<table class="tableblock frame-none grid-none stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Option</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>org.jboss.logging.tools.report.type</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Indicates the type of report that should be generated. The current report types are <code>adoc</code> for asciidoc or <code>xml</code> for XML.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>org.jboss.logging.tools.report.path</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The path where the generated reports should be placed. This defaults to the location where new class files are placed.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>org.jboss.logging.tools.report.title</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">An optional title for the report. For asciidoc this defaults to <code>Messages</code>. For XML the <code>&lt;title&gt;</code> element is left off.</p></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
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