Hi,
I don't think you understood me. The point here is not about the
${catalina.base}, it's about the whole expression
"CacheManager.newInstance(URI('file:${catalina.base}/conf/ehcache.xml').toURL())".
The ${catalina.base} will of course be expanded and give something like:
"CacheManager.newInstance(URI('file:/home/tomcat/conf/ehcache.xml').toURL())"
And then, this expression can be evaluated through EL and give a real
CacheManager instance.
I could have written this that way:
"CacheManager.newInstance(URI('file:'+System.getProperty('catalina.base')+'/conf/ehcache.xml').toURL())"
The important thing here is that the whole expression parameter could be given
to an ELProcessor instead of having specialized ObjectFactory for each case (I
would of course use a specific ObjectFactory if there's one, like
BasicDataSourceFactory... but for exotic and rare cases where no ObjectFactory
exist, a generic EL-based one could be helpful).
Xavier
----------------------------------------
> Date: Thu, 29 Aug 2013 14:53:31 -0400
> From: ch...@christopherschultz.net
> To: users@tomcat.apache.org
> Subject: Re: Using EL expressions in an ObjectFactory
>
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>
> Xavier,
>
> On 8/29/13 3:06 AM, Xavier Dury wrote:
>> Could it be possible for the tomcat team to include a
>> javax.naming.spi.ObjectFactory which would use EL3.0 expressions?
>>
>> It would be great if you want to have resource-ref which are not of
>> the usual types.
>>
>> I always wanted to have an ObjectFactory for URLs but having one
>> for each type is too much work... so now, that we have a more
>> powerful EL engine, maybe it would a great opportunity to use it.
>>
>> <Resource name="/url/SomeService" type="java.net.URL"
>> factory="org.apache.tomcat.jndi.ELObjectFactory"
>> importClass="java.net.URI"
>> expression="URI('http://some.service.url').toURL()" />
>>
>> <Resource name="/cache/CacheManager"
>> type="net.sf.ehcache.CacheManager"
>> factory="org.apache.tomcat.jndi.ELObjectFactory"
>> importClass="net.sf.ehcache.CacheManager,java.net.URI"
>> importStatic="net.sf.ehcache.CacheManager.newInstance"
>> expression="CacheManager.newInstance(URI('file:${catalina.base}/conf/ehcache.xml').toURL())"
>
> What's
>>
> wrong with just using $catalina.base within your context.xml?
> It will expand appropriately already... no EL needed.
>
> - -chris
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