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README.html
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<!DOCTYPE html>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="Asciidoctor 2.0.10">
<meta name="author" content="Joel Tosi">
<title>logging: Example That Sets Up Different Logging Levels</title>
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<body class="article">
<div id="header">
<h1>logging: Example That Sets Up Different Logging Levels</h1>
<div class="details">
<span id="author" class="author">Joel Tosi</span><br>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="quoteblock abstract">
<blockquote>
The <code>logging</code> quickstart demonstrates how to configure different logging levels in JBoss EAP. It also includes an asynchronous logging example.
</blockquote>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_what_is_it">What is it?</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <code>logging</code> quickstart demonstrates how to set up and log different levels of information in Red Hat JBoss Enterprise Application Platform. An example of asynchronous logging is also included in the configuration examples.</p>
</div>
<div class="paragraph">
<p>This quickstart contains just one class file and one JSP file. When you access the application, it fires off the logging information.</p>
</div>
<div class="paragraph">
<p>To better visualize how the logging configuration works, you first deploy and access the application before configuring the logs and view the resulting log files. Then you configure the logs, redeploy and access the application, and look at the log files again to see the differences.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="system_requirements">System Requirements</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The application this project produces is designed to be run on Red Hat JBoss Enterprise Application Platform 7.4 or later.</p>
</div>
<div class="paragraph">
<p>All you need to build this project is Java 8.0 (Java SDK 1.8) or later and Maven 3.3.1 or later. See <a href="https://github.com/jboss-developer/jboss-developer-shared-resources/blob/master/guides/CONFIGURE_MAVEN_JBOSS_EAP.adoc#configure_maven_to_build_and_deploy_the_quickstarts">Configure Maven to Build and Deploy the Quickstarts</a> to make sure you are configured correctly for testing the quickstarts.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="use_of_jboss_home_name">Use of the EAP_HOME and QUICKSTART_HOME Variables</h2>
<div class="sectionbody">
<div class="paragraph">
<p>In the following instructions, replace <code><em>EAP_HOME</em></code> with the actual path to your JBoss EAP installation. The installation path is described in detail here: <a href="https://github.com/jboss-developer/jboss-developer-shared-resources/blob/master/guides/USE_OF_EAP_HOME.adoc#use_of_product_home_and_jboss_home_variables">Use of <em>EAP_HOME</em> and <em>JBOSS_HOME</em> Variables</a>.</p>
</div>
<div class="paragraph">
<p>When you see the replaceable variable <em>QUICKSTART_HOME</em>, replace it with the path to the root directory of all of the quickstarts.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="back_up_standalone_server_configuration">Back Up the JBoss EAP Standalone Server Configuration</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Before you begin, back up your server configuration file.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>If it is running, stop the JBoss EAP server.</p>
</li>
<li>
<p>Back up the <code><em>EAP_HOME</em>/standalone/configuration/standalone.xml</code> file.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>After you have completed testing this quickstart, you can replace this file to restore the server to its original configuration.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="start_the_eap_standalone_server">Start the JBoss EAP Standalone Server</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Open a terminal and navigate to the root of the JBoss EAP directory.</p>
</li>
<li>
<p>Start the JBoss EAP server with the default profile by typing the following command.</p>
<div class="listingblock">
<div class="content">
<pre class="highlight nowrap"><code>$ <em>EAP_HOME</em>/bin/standalone.sh </code></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
For Windows, use the <code><em>EAP_HOME</em>\bin\standalone.bat</code> script.
</td>
</tr>
</table>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="build_and_deploy_the_quickstart">Build and Deploy the Quickstart</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Make sure you <a href="#start_the_eap_standalone_server">start the JBoss EAP server</a> as described above.</p>
</li>
<li>
<p>Open a terminal and navigate to the root directory of this quickstart.</p>
</li>
<li>
<p>Type the following command to build the artifacts.</p>
<div class="listingblock">
<div class="content">
<pre class="highlight nowrap"><code>$ mvn clean package wildfly:deploy</code></pre>
</div>
</div>
</li>
</ol>
</div>
<div class="paragraph">
<p>This deploys the <code>jboss-logging/target/jboss-logging.war</code> to the running instance of the server.</p>
</div>
<div class="paragraph">
<p>You should see a message in the server log indicating that the archive deployed successfully.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="access_the_application">Access the Application</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The application is running at the following URL: <a href="http://localhost:8080/jboss-logging/" class="bare">http://localhost:8080/jboss-logging/</a>.</p>
</div>
<div class="paragraph">
<p>You will see the following message in the server console:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight nowrap"><code>FATAL [org.jboss.as.quickstarts.logging.LoggingExample] (default task-1) THIS IS A FATAL MESSAGE
ERROR [org.jboss.as.quickstarts.logging.LoggingExample] (default task-1) THIS IS AN ERROR MESSAGE
WARN [org.jboss.as.quickstarts.logging.LoggingExample] (default task-1) THIS IS A WARNING MESSAGE
INFO [org.jboss.as.quickstarts.logging.LoggingExample] (default task-1) THIS IS AN INFO MESSAGE
ERROR [org.jboss.as.quickstarts.logging.LoggingExample] (default task-1) THIS IS AN ERROR MESSAGE
FATAL [org.jboss.as.quickstarts.logging.LoggingExample] (default task-1) THIS IS A FATAL MESSAGE
INFO [org.jboss.as.quickstarts.logging.LoggingExample] (default task-1) THIS IS AN INFO MESSAGE
WARN [org.jboss.as.quickstarts.logging.LoggingExample] (default task-1) THIS IS A WARNING MESSAGE</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_check_the_server_logs">Check the Server Logs</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The log files are located in the <code><em>EAP_HOME</em>/standalone/log</code> log directory. At this point you should see the following log files.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>server.log</code> - This is the standard log produced by the application server. By default, it contains all the server log messages, including the server startup messages.</p>
</li>
<li>
<p><code>gc.log.0.current</code> - This garbage collection log is produced only if garbage collection is enabled on the server. It contains garbage collection activity that can be used for diagnostic purposes. This log can be ignored as it is not used in this quickstart.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_configure_the_server">Configure the Server</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Now you have deployed the quickstart with the default configuration, you run a management CLI script to configure the logging subsystem and review the differences in the resulting log files.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Before you begin, make sure you do the following:</p>
<div class="ulist">
<ul>
<li>
<p><a href="#back_up_standalone_server_configuration">Back up the JBoss EAP standalone server configuration</a> as described above.</p>
</li>
<li>
<p><a href="#start_the_eap_standalone_server">Start the JBoss EAP server with the standalone default profile</a> as described above.</p>
</li>
</ul>
</div>
</li>
<li>
<p>Review the <code>configure-logging.cli</code> file in the root of this quickstart directory. This script configures the logging subsytem in the server configuration file. It configures the periodic rotating file handlers and the async handlers, creates the logger for our quickstart class and sets the level to TRACE, and assigns the async handlers for our quickstart class.</p>
</li>
<li>
<p>Open a new terminal, navigate to the root directory of this quickstart, and run the following command, replacing <code><em>EAP_HOME</em></code> with the path to your server:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight nowrap"><code>$ <em>EAP_HOME</em>/bin/jboss-cli.sh --connect --file=configure-logging.cli</code></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
For Windows, use the <code><em>EAP_HOME</em>\bin\jboss-cli.bat</code> script.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>You should see the following result when you run the script:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight nowrap"><code>The batch executed successfully</code></pre>
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_review_the_modified_server_configuration">Review the Modified Server Configuration</h2>
<div class="sectionbody">
<div class="paragraph">
<p>After stopping the server, open the <code><em>EAP_HOME</em>/standalone/configuration/standalone.xml</code> file and review the changes.</p>
</div>
<div class="paragraph">
<p>The following XML was added to the <code>logging</code> subsystem.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight nowrap"><code class="language-xml" data-lang="xml"><async-handler name="TRACE_QS_ASYNC">
<level name="TRACE"/>
<queue-length value="1024"/>
<overflow-action value="block"/>
<subhandlers>
<handler name="FILE_QS_TRACE"/>
</subhandlers>
</async-handler>
<async-handler name="DEBUG_QS_ASYNC">
<level name="DEBUG"/>
<queue-length value="1024"/>
<overflow-action value="block"/>
<subhandlers>
<handler name="FILE_QS_DEBUG"/>
</subhandlers>
</async-handler>
<async-handler name="INFO_QS_ASYNC">
<level name="INFO"/>
<queue-length value="1024"/>
<overflow-action value="block"/>
<subhandlers>
<handler name="FILE_QS_INFO"/>
</subhandlers>
</async-handler>
<async-handler name="WARN_QS_ASYNC">
<level name="WARN"/>
<queue-length value="1024"/>
<overflow-action value="block"/>
<subhandlers>
<handler name="FILE_QS_WARN"/>
</subhandlers>
</async-handler>
<async-handler name="ERROR_QS_ASYNC">
<level name="ERROR"/>
<queue-length value="1024"/>
<overflow-action value="block"/>
<subhandlers>
<handler name="FILE_QS_ERROR"/>
</subhandlers>
</async-handler>
<async-handler name="FATAL_QS_ASYNC">
<level name="FATAL"/>
<queue-length value="1024"/>
<overflow-action value="block"/>
<subhandlers>
<handler name="FILE_QS_FATAL"/>
</subhandlers>
</async-handler>
...
<periodic-rotating-file-handler name="FILE_QS_TRACE">
<file relative-to="jboss.server.log.dir" path="quickstart.trace.log"/>
<suffix value=".yyyy.MM.dd"/>
</periodic-rotating-file-handler>
<periodic-rotating-file-handler name="FILE_QS_DEBUG">
<file relative-to="jboss.server.log.dir" path="quickstart.debug.log"/>
<suffix value=".yyyy.MM.dd"/>
</periodic-rotating-file-handler>
<periodic-rotating-file-handler name="FILE_QS_INFO">
<file relative-to="jboss.server.log.dir" path="quickstart.info.log"/>
<suffix value=".yyyy.MM.dd"/>
</periodic-rotating-file-handler>
<periodic-rotating-file-handler name="FILE_QS_WARN">
<file relative-to="jboss.server.log.dir" path="quickstart.warn.log"/>
<suffix value=".yyyy.MM.dd"/>
</periodic-rotating-file-handler>
<periodic-rotating-file-handler name="FILE_QS_ERROR">
<file relative-to="jboss.server.log.dir" path="quickstart.error.log"/>
<suffix value=".yyyy.MM.dd"/>
</periodic-rotating-file-handler>
<periodic-rotating-file-handler name="FILE_QS_FATAL">
<file relative-to="jboss.server.log.dir" path="quickstart.fatal.log"/>
<suffix value=".yyyy.MM.dd"/>
</periodic-rotating-file-handler>
...
<logger category="org.jboss.as.quickstarts.logging">
<level name="TRACE"/>
<handlers>
<handler name="TRACE_QS_ASYNC"/>
<handler name="DEBUG_QS_ASYNC"/>
<handler name="INFO_QS_ASYNC"/>
<handler name="WARN_QS_ASYNC"/>
<handler name="ERROR_QS_ASYNC"/>
<handler name="FATAL_QS_ASYNC"/>
</handlers>
</logger></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_test_the_new_logging_configuration">Test the New Logging Configuration</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Make sure you <a href="#start_the_eap_standalone_server">start the JBoss EAP server with the standalone default profile</a> as described above.</p>
</li>
<li>
<p><a href="#build_and_deploy_the_quickstart">Build and deploy the quickstart</a>.</p>
</li>
<li>
<p><a href="#access_the_application">Access the application</a>.</p>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_recheck_the_server_logs">Recheck the Server Logs</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The log files are located in the <code><em>EAP_HOME</em>/standalone/log</code> log directory. You should now see the 6 additional log files that are produced by this quickstart. They are listed below in hierarchical order from the largest file containing the most messages to the smallest file containing the least messages.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>quickstart.trace.log</code></p>
</li>
<li>
<p><code>quickstart.debug.log</code></p>
</li>
<li>
<p><code>quickstart.info.log</code></p>
</li>
<li>
<p><code>quickstart.warn.log</code></p>
</li>
<li>
<p><code>quickstart.error.log</code></p>
</li>
<li>
<p><code>quickstart.fatal.log</code></p>
</li>
</ul>
</div>
<div class="paragraph">
<p>The following describes what happens when you access this quickstart:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>The application class file fires off logs of the various types (INFO, DEBUG, TRACE, WARN, ERROR, FATAL). Each log message goes to a different file, as defined in the <code>standalone.xml</code> file. Also notice in the <code>standalone.xml</code> that the application package defines its own log level.</p>
</li>
<li>
<p>The class file demonstrates the usage of <em>log guards</em>. <em>Log guards</em> are a development best practice. Simply put, instead of just writing out logs, we wrap the log writes in a check for that log level being enabled. While this may seem like overhead, that boolean check is more efficient than relying on the underlying framework to do the check at write time.</p>
</li>
<li>
<p>Finally, the class file logs various levels, each to its own file as configured in <code>standalone.xml</code>. Note that log levels are hierarchical. When set, all log levels above the specified level are logged as well.</p>
</li>
<li>
<p>Common uses of the 6 log levels are outlined below. You should use the level that makes the most sense in your environment.</p>
<div class="listingblock">
<div class="content">
<pre class="highlight nowrap"><code>FATAL - Used to track critical system failures. When this log message is written, it is writing application error that has caused service to cease. This is the most narrow logging.
ERROR - Used to track application errors that may cause one request to fail (not a service ceasement).
WARN - This is setting is used in most production environments. At this level, all *WARN*, *ERROR*, and *FATAL* messages are written. Use this level message as a predictive measure for possible forthcoming issues.
INFO - Usually only used in a development environment. This provides any information - state transition, object values, etc
DEBUG - Turned on in any environment when a problem is occuring. The information captured may be throughput, communication, object values, etc.
TRACE - Turned on in any environment where you are trying to follow an execution path, for optimization or debugging. This is the most broad logging level and all messages are written.</code></pre>
</div>
</div>
</li>
<li>
<p>To view log file differences for different logging levels, change the level for the "org.jboss.as.quickstarts.logging" logger
from TRACE to DEBUG, INFO, WARN, ERROR, or FATAL, then access the application.</p>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="undeploy_the_quickstart">Undeploy the Quickstart</h2>
<div class="sectionbody">
<div class="paragraph">
<p>When you are finished testing the quickstart, follow these steps to undeploy the archive.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Make sure you <a href="#start_the_eap_standalone_server">start the JBoss EAP server</a> as described above.</p>
</li>
<li>
<p>Open a terminal and navigate to the root directory of this quickstart.</p>
</li>
<li>
<p>Type this command to undeploy the archive:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight nowrap"><code>$ mvn wildfly:undeploy</code></pre>
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="restore_the_standalone_server_configuration">Restore the JBoss EAP Standalone Server Configuration</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You can restore the original server configuration using either of the following methods.</p>
</div>
<div class="ulist">
<ul>
<li>
<p>You can <a href="#restore_standalone_server_configuration_using_cli">run the <code>remove-logging.cli</code> script</a> provided in the root directory of this quickstart.</p>
</li>
<li>
<p>You can <a href="#restore_standalone_server_configuration_manually">manually restore the configuration</a> using the backup copy of the configuration file.</p>
</li>
</ul>
</div>
<div class="sect2">
<h3 id="restore_standalone_server_configuration_using_cli">Restore the JBoss EAP Standalone Server Configuration by Running the JBoss CLI Script</h3>
<div class="olist arabic">
<ol class="arabic">
<li>
<p><a href="#start_the_eap_standalone_server">Start the JBoss EAP server</a> as described above.</p>
</li>
<li>
<p>Open a new terminal, navigate to the root directory of this quickstart, and run the following command, replacing <code><em>EAP_HOME</em></code> with the path to your server:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight nowrap"><code>$ <em>EAP_HOME</em>/bin/jboss-cli.sh --connect --file=remove-logging.cli</code></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
For Windows, use the <code><em>EAP_HOME</em>\bin\jboss-cli.bat</code> script.
</td>
</tr>
</table>
</div>
</li>
</ol>
</div>
<div class="paragraph">
<p>This script removes the log and file handlers from the <code>logging</code> subsystem in the server configuration. You should see the following result when you run the script:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight nowrap"><code>The batch executed successfully</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="restore_standalone_server_configuration_manually">Restore the JBoss EAP Standalone Server Configuration Manually</h3>
<div class="paragraph">
<p>When you have completed testing the quickstart, you can restore the original server configuration by manually restoring the backup copy the configuration file.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>If it is running, stop the JBoss EAP server.</p>
</li>
<li>
<p>Replace the <code><em>EAP_HOME</em>/standalone/configuration/standalone.xml</code> file with the backup copy of the file.</p>
</li>
</ol>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="run_the_quickstart_in_redhat_codeready_studio_or_eclipse">Run the Quickstart in Red Hat CodeReady Studio or Eclipse</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You can also start the server and deploy the quickstarts or run the Arquillian tests in Red Hat CodeReady Studio or from Eclipse using JBoss tools. For general information about how to import a quickstart, add a JBoss EAP server, and build and deploy a quickstart, see <a href="https://github.com/jboss-developer/jboss-developer-shared-resources/blob/master/guides/USE_JBDS.adoc#use_red_hat_jboss_developer_studio_or_eclipse_to_run_the_quickstarts">Use Red Hat CodeReady Studio or Eclipse to Run the Quickstarts</a>.</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Make sure you configure JBoss EAP server logging as described above under <a href="#configure_the_server">Configure the Server</a>. Stop the server at the end of that step.</p>
</li>
<li>
<p>Make sure you <a href="#remove_the_logging_configuration">Remove the Logging Configuration</a> when you have completed testing this quickstart.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="debug_the_application">Debug the Application</h2>
<div class="sectionbody">
<div class="paragraph">
<p>If you want to debug the source code of any library in the project, run the following command to pull the source into your local repository. The IDE should then detect it.</p>
</div>
<div class="listingblock">
<div class="content">
<pre>$ mvn dependency:sources</pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="openshift_incompatibility">JBoss EAP for OpenShift Incompatibility</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This quickstart is not compatible with JBoss EAP for OpenShift or JBoss EAP for OpenShift Online templates.</p>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2021-06-23 15:53:26 UTC
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