18 Configuration
JacORB looks for the common properties file orb.properties in the following places:
1. in the lib directory of the JDK installation. (The JDK’s home directory denoted by the
system property ”java.home”).
2. in the user home directory. (This is denoted by the system property ”user.home”. On
Windows, this is c:\documents\username, on Unixes it’s ˜user. If in doubt where
your home directory is, write a small Java programm that prints out this property.
3. on the class path.
The common properties file is searched in the order presented above, so you may actually be
loading multiple files of this name. If a properties file is found it is loaded, and any property
values defined in this file will override values of the same property that were loaded earlier.
Loading properties files from the classpath is useful when distributing applications packaged in
JAR files.
The ORB properties file
Having ORB-specific properties files is necessary when multiple ORB instances live in the same
process, but need to have separate configurations, e.g., some ORBs use SSL and others don’t,
or some ORBs need to listen on separate but predefined ports. To let colocated ORBs use and
retrieve separate configurations, JacORB provides a lookup mechanisms based on a specific
property, the ORBid property. The default value for the ORBid is jacorb, ie. is the ORBid
is not explicitly set anywhere, it defaults to jacorb. Note that this ORBid is reserved, ie.,
you cannot explicitly set your ORBid to this value. To use different configurations for different
ORBs, you simply pass different ORBid values to your ORBs.
JacORB looks for ORB properties files in these places:
1. jacorb.config.dir/etc/orbid.properties., if that exists, or
2. jacorb.home/etc/orbid.properties., or
3. the current directory (’./orbid.properties.’)
4. on the class path.
The jacorb.config.dir and jacorb.home properties must be set for JacORB to be
able to use a preconfigured configuration directory. The jacorb.home property defaults to
‘‘.’’, if unset. Setting these properties can be done in the orb.properties file, or by
passing a property in on the commandline, like this:
$ jaco -Djacorb.config.dir=c:/ -DORBid=example test.Example
This commandline causes JacORB to look for a file called example.properties in
c:/etc. If the -DORBid=example had been ommitted, the name of the ORB properties
file that JacORB would try to load would have been jacorb.properties, because that is
the default value for the ORBid. A good starting point is to have a common properties file that
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