-jarasresource option in for loadjava utility. How does it work?

Question

Hi, I have a simple java function I want to load into Oracle DB as java custom function. This I can do no problem when it is so simple it doesn't import any other classes outside of the standard java jre, but when I want to include third party libraries I start hitting the problems.
I would like to load the third party libraries as jar files (in this case common-codec.jar from apache), but can only get this to load without the -jarasresource option i.e where the loadjava utility unpacks all the files in the jar an loads them separately. This just doesn't seem right - surely it would be better to load the jar file as a whole and have it on the class path for my custom class to use.
The problems is thus...
D:\>loadjava -thin -u audit/****@<dbname>:1521:devdb -verbose -force -order -resolve -grant public -s -jarasresource d:\commons-codec-1.3\commons-cod
ec-1.3.jar
arguments: '-thin' '-u' 'audit/****@<dbname>:1521:devdb' '-verbose' '-force' '-order' '-
resolve' '-grant' 'public' '-s' '-jarasresource' 'd:\commons-codec-1.3\commons-codec-1.3.jar'
creating : resource d:/commons-codec-1.3/commons-codec-1.3.jar
loading  : resource d:/commons-codec-1.3/commons-codec-1.3.jar
granting : execute on resource d:/commons-codec-1.3/commons-codec-1.3.jar to public
skipping : resource d:/commons-codec-1.3/commons-codec-1.3.jar
D:\>loadjava -thin -u audit/****@<dbname>:1521:devdb -verbose -force -order -resolve -grant public -s StringPatternEncoder.class
arguments: '-thin' '-u' 'audit/****@<dbname>:1521:devdb' '-verbose' '-force' '-order' '-
resolve' '-grant' 'public' '-s' 'StringPatternEncoder.class'
creating : class uk/police/kent/util/StringPatternEncoder
loading  : class uk/police/kent/util/StringPatternEncoder
granting : execute on class uk/police/kent/util/StringPatternEncoder to public
resolving: class uk/police/kent/util/StringPatternEncoder
errors   : class uk/police/kent/util/StringPatternEncoder
    ORA-29521: referenced name org/apache/commons/codec/language/DoubleMetaphone could not be found
synonym  : uk/police/kent/util/StringPatternEncoder
The following operations failed
    class uk/police/kent/util/StringPatternEncoder: resolution
exiting  : Failures occurred during processingso my questions are
1. did the load of the jar fail in the first command as it said it was skipped?
2. if it didn't fail, how do I reference it when I issue the second command i.e. to resolve using the jar file - do I need to specify a -resolver option (this seems to suggest in the docs that this is how to supply a different 'classpath')
Could example usage of --resolver be given using my example as the ones in docs only give example on ((* SCOTT) (* PUBLIC)) which doesn't mean a lot to me?
also, how do I check the existence of my classes and jar files in the db? I have checked the user_objects view and can see my jar file there, but don't know what schema etc. it is in.
platform
loadjava - windows
db - 10g Linux
be gentle with me - I am a developer and don't usually get involved with db at this level.
Thanks
Conrad
thanks

Answer 1

Hi,
The default resolver spec for SCOTT schema is '{(*SCOTT) (* PUBLIC)}'.
If you want a non-default resolver spec, you have to explictly specify it. Example the following resolver spec will search the SCOTT, OTHER, and PUBLIC schemas:
loadjava -resolve -resolver "((* SCOTT)(* OTHER)(*PUBLIC))" ...Loadjava does not resolve Java resources; the resources objects
are looked up by the Java VM within the scope of the resolver spec of the
referring class. A Java resource can have a “resolver spec” but is only looked up and used during the resolution of the class, which refers to it;
All these are explained in chapter 2 and 3 of my book (see below).
In your case, it looks like you need to explode the jar (without -jarasresource option).
Kuassi
- blog http://db360.blogspot.com/
- book http://db360.blogspot.com/2006/08/oracle-database-programming-using-java_01.html