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| <h1>Property Overriding</h1> |
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| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>OpenEJB consists of several components (containers, |
| resource adapters, security services, etc.) all of which are pluggable |
| and have their own unique set of configurable properties. These |
| components are required to specify their default property values in |
| their service-jar.xml file. This means that at a minimum you as a user |
| only need to specify what you’d like to be different. You specify the |
| property name and the new value and the default value will be |
| overwritten before the component is created.</p> |
| </div> |
| <div class="paragraph"> |
| <p>We call this overriding and there are several ways to do it.</p> |
| </div> |
| </div> |
| </div> |
| <h1 id="_the_openejb_xml" class="sect0">The openejb.xml</h1> |
| <div class="paragraph"> |
| <p>The default openejb.xml file has most of the useful properties for each |
| component explicitly listed with default values for documentation |
| purposes. It is safe to delete them and be assured that no behavior will |
| change if a smaller config file is desired.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Overriding can also be done via the command line or plain Java system |
| properties. See <a href="system-properties.html">System Properties</a> for |
| details.</p> |
| </div> |
| <div class="sect1"> |
| <h2 id="_what_properties_are_available">What properties are available?</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>To know what properties can be overriden the './bin/openejb properties' |
| command is very useful: see <a href="properties-tool.html">Properties Tool</a></p> |
| </div> |
| <div class="paragraph"> |
| <p>It’s function is to connect to a running server and print a canonical |
| list of all properties OpenEJB can see via the various means of |
| configuration. When sending requests for help to the users list or jira, |
| it is highly encouraged to send the output of this tool with your |
| message.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_not_configurable_via_openejb_xml">Not configurable via openejb.xml</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The only thing not yet configurable via this file are ServerServices due |
| to OpenEJB’s embeddable nature and resulting long standing tradition of |
| keeping the container system separate from the server layer. This may |
| change someday, but untill then ServerServices are configurable via |
| conf/.properties files such as conf/ejbd.properties to configure the |
| main protocol that services EJB client requests.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The format those properties files is greatly adapted from the xinet.d |
| style of configuration and even shares similar functionality and |
| properties such as host-based authorization (HBA) via the 'only_from' |
| property.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_restoring_openejb_xml_to_the_defaults">Restoring openejb.xml to the defaults</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>To restore this file to its original default state, you can simply |
| delete it or rename it and OpenEJB will see it’s missing and unpack |
| another openejb.xml into the conf/ directory when it starts.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This is not only handy for recovering from a non-functional config, but |
| also for upgrading as OpenEJB will not overwrite your existing |
| configuration file should you choose to unpack an new distro over the |
| top of an old one — this style of upgrade is safe provided you move |
| your old lib/ directory first.</p> |
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