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<h1>System Properties</h1>
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<div id="preamble">
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<div class="paragraph">
<p>You can find a list of properties <a href="properties-listing.html">here</a>.
But read on to understand how these can be used.</p>
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<div class="sect1">
<h2 id="_overriding_openejb_xml">Overriding openejb.xml</h2>
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<div class="paragraph">
<p>Anything in the openejb.xml file can be overridden via system properties
of the format:</p>
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<p><code>-D&lt;id&gt;.&lt;property-name&gt;=&lt;property-value&gt;</code></p>
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<p>..where id is the value in the config file for example:</p>
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<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;Connector id="mysql"&gt;
JdbcDriver com.mysql.jdbc.Driver
JdbcUrl jdbc:mysql://localhost/test
UserName test
&lt;/Connector&gt;</code></pre>
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<p>Could be overridden as follows via system properties on the command
line:</p>
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<div class="quoteblock">
<blockquote>
<div class="paragraph">
<div class="title">/bin/openejb start -Dmysql.JdbcDriver=com.mysql.jdbc.Driver</div>
<p>-Dmysql.JdbcUrl=jdbc:mysql://localhost/test -Dmysql.UserName=test</p>
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</blockquote>
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<div class="sect1">
<h2 id="_overriding_server_services">Overriding Server Services</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Any server service installed into OpenEJB can be overridden in the same
fashion as things in the openejb.xml file.</p>
</div>
<div class="paragraph">
<p>For example, when OpenEJB starts it prints out the following:</p>
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<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java"> ** Starting Services **
NAME IP PORT
httpejbd 0.0.0.0 4204
telnet 0.0.0.0 4202
ejbd 0.0.0.0 4201
hsql 0.0.0.0 9001
activemq 127.0.0.1 4206
derbynet 0.0.0.0 4205
admin thread 0.0.0.0 4200</code></pre>
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<div class="paragraph">
<p>Each of those has the same standard xinet.d-like properties which can
also be configured as such:</p>
</div>
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<p><code>-D&lt;id&gt;.&lt;property-name&gt;=&lt;property-value&gt;</code></p>
</div>
<div class="olist lowerroman">
<ol class="lowerroman" type="i">
<li>
<p>where 'id' is the name of the server service and 'property-name' is
one of the following: bind, port, threads, disabled, only_from.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>So to set the address and port the ejbd service will bind to, simply
specify this on the command line:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-properties" data-lang="properties">./bin/openejb start -Dejbd.bind=192.168.1.12 -Dejbd.port=9988</code></pre>
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