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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 30856] New: - ConfigurationFactory loading from classpath issue
Date Thu, 26 Aug 2004 05:03:42 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=30856

ConfigurationFactory loading from classpath issue

           Summary: ConfigurationFactory loading from classpath issue
           Product: Commons
           Version: unspecified
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Configuration
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: jomofo7@yahoo.com


I found a thread on the commons mailing list about this topic, but did not see a
resolution presented.  

http://www.mail-archive.com/commons-user@jakarta.apache.org/msg07782.html

It seems the only way to load a properties file from a separate jar in the
classpath is to use absolute paths.  I believe the ConfigurationFactory
framework would be a tad more useful if it used the classloader to load the
properties files as resources instead.  The major advantage being that one could
package a default properties file in a config jar, but temporarily override it
by placing a copy higher in the classpath.  There are other uses as well, but
that's the main use case I have in mind right now.

Let's say I have the following JAR that contains only these configuration files:

core-config
  properties/config.xml  <= The ConfigurationFactory settings
  properties/test-config.xml  <= An XML properties file

core-configtest
  com.test.ConfigurationTest <= Constructs ConfigurationFactory and calls
getConfiguration()

Because I use the classload to load 

<!-- config.xml -->
<configuration>
  <xml fileName="test-config.xml"/>
</configuration>

I have tried many variations of the above path to get it to load from the
classpath to no avail, such as:

<xml fileName="properties/test-config.xml"/>
<xml fileName="/properties/test-config.xml"/>
<xml fileName="file:test-config.xml"/>
<xml fileName="file:properties/test-config.xml"/>
<xml fileName="file:/properties/test-config.xml"/>

Most of the time it coughs out a SAXException with a garbled path like this:

Could not load from
C:\dev\Java\Core-ConfigTest\file:\C:\dev\Java\Core-ConfigTest\lib\core-config.jar!\properties\test-config.xml
	at org.apache.commons.digester.Digester.createSAXException(Digester.java:2540)
	at org.apache.commons.digester.Digester.createSAXException(Digester.java:2566)
	at org.apache.commons.digester.Digester.endElement(Digester.java:1061)

In other words, I can't seem to make it use the appropriate URL for accessing
the file when it's in another JAR.  

jar:file:/C:/dev/Java/Core-ConfigTest/lib/core-config.jar!/properties/config.xml

If I move the properties folder to the JAR that contains the test class, it
works fine.  I believe I could also use an absolute path to the properties file,
but again, that precludes me from being able to quickly override the properties
file by placing a copy higher in the classpath.

This is my first experience with trying to initiate a change in an open source
project, so bear with me if I'm not following the right protocol.  I'd like to
take a stab at creating a patch myself if someone hasn't already beat me to it.

Thanks.

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