Externalising bits of persistence.xml

[tony.herstell1]

I can externalise my application properties to a file in the WAR.

  private static final String APPLICATION_PROPERTIES = "/xxx.properties";

  private Properties applicationProperties = new Properties();

   applicationProperties.load(PropertiesService.class.getResourceAsStream(APPLICATION_PROPERTIES));

I can externalise my system (application) properties to a file in the JBoss Data directory using the system property.

  private static final String SYSTEM_PROPERTIES = "xxxsystem.properties";

  final String systemPropertiesFilePathAsString = System.getProperty("jboss.server.data.dir") + File.separator + SYSTEM_PROPERTIES;

  final File systemPropertiesFile = new File(this.systemPropertiesFilePathAsString);

  private Properties systemProperties = new Properties();

  systemProperties.load(new FileReader(this.systemPropertiesFile)

I am keen to externalise a bit of persistence.xml and wondered whats hte voodoo to indirect the value?

   <property name="hibernate.hbm2ddl.auto" value="validate" />

e.g.

   <property name="hibernate.hbm2ddl.auto" value="$(xxx)" />  [Note: Seam allowed el in the code which was kinda useful for cruff like this]

NOTE:

I don't use Build scripts (cus I use exploded deployment) so can't use Ant/etc. to substitite at build time as I don't have a "build" step (and dont want to introduce one as it slows delvelopment down too much).

Thx.

[smarlow]

As mentioned here, you need to configure the following in standalone.xml (or whatever your AS configuration file is that your using):

<spec-descriptor-property-replacement>true</spec-descriptor-property-replacement>

            <jboss-descriptor-property-replacement>true</jboss-descriptor-property-replacement>

Note that you can use the system property replacement for the property values but not the property names. 

Scott

[tony.herstell1]

Thanks Scott.

From what I have read I can't use it as am using JBoss 7.1.1.Final

>>> I am replying to my question here, which was answered in another issue https://community.jboss.org/message/761464#761464 . It is not available in 7.1.1

I will just have to ship 2x War files and they can run one until it works (with create-drop and a 2MB import.sql!) and then run the one with Validate (or update if I feel lucky ).

Is it possible to pass in a "command line param" (i.e. from the command line when running the server):

xxx -system-param bling=123

and then access if via summat like:

$$bling$$

?

[nickarls]

If you pass in -Dfoo=bar, ${foo} should be evaluated to bar in all config files that support replacement. You can also dig out the value in your own code with System.getProperty("foo");

[tony.herstell1]

>> config files that support replacement

I am struglling to find any doco on this (like what supports replacement)?

useful for thing slike setting up the annottions too:

e.g.

@Schedule(minute = "*/2", hour = "*", persistent = false) // every 2 mins

@Schedule(minute = "*/$$schedule_for_xxx_minute$$", hour = "$$schedule_for_xxx_hour$$", persistent = false) // offline configurable

[nickarls]

Annotations are compile-time constructs but timers can also be defined in xml so the ${delay_minute} could be placed there if it's supported.

There are some details in http://www.scribd.com/doc/104045906/Jboss-EAP-6-Administration-and-Configuration-Guide-en-US#outer_page_212 for enabling the features on 7.1.2

Annotation based replacement would have to involve some sort of maven pre-processing of Java files. Doable but not nice.

[tony.herstell1]

Nicklas,

Thanks for the reply and I will be reading up on the linlk you sent.

Even though I use Maven for dependencies I still don't use a build script so any pre-processing of Java files would not be workable as it would slow developent too much.