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| <h1>Property Overriding |
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| <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> |
| |
| <p>We call this overriding and there are several ways to do it.</p> |
| |
| <p><a name="PropertyOverriding-Theopenejb.xml"></a></p> |
| |
| <h1>The openejb.xml</h1> |
| |
| <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> |
| |
| <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> |
| |
| <p><a name="PropertyOverriding-Whatpropertiesareavailable?"></a></p> |
| |
| <h2>What properties are available?</h2> |
| |
| <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> |
| |
| <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> |
| |
| <p><a name="PropertyOverriding-Notconfigurableviaopenejb.xml"></a></p> |
| |
| <h2>Not configurable via openejb.xml</h2> |
| |
| <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/<service-id>.properties files such as conf/ejbd.properties to |
| configure the main protocol that services EJB client requests.</p> |
| |
| <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> |
| |
| <p><a name="PropertyOverriding-Restoringopenejb.xmltothedefaults"></a></p> |
| |
| <h2>Restoring openejb.xml to the defaults</h2> |
| |
| <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> |
| |
| <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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