Call functions between classes

Question

Hi all,
I have two java classes compiled into the DB in different schemas. How could I call the static method in classA from classB?
I suppose I need to get the schema name in there somehow, or is it just as simple as classA.method(arg1)
havent dared trying yet ;)

Answer 1

You need to change the resolver of the referencing class to include the schema of the referenced class.
When a class is created, whether directly by create java ddl or by loadjava it has an attribute known as a resolver which is essentially a search path for schemas to look in when resolving names referenced in the class. The resolver is a list of pairs of the form ((<pattern> <schema name>)(<pattern> <schema name>)...). When the class is resolved any name X that it references is bound to a class object by iterating over the resolver from left to right identifying each term in which the name of X matches the pattern and looking to see whether a class with the name of X exists in the schema identified by the term. If such a class exists, the search stops and the name X is bound to that class. If after looking at all the terms there is no class found, then a resolution error occurs. The pattern can either be an explicit name, or an explicit prefix followed by '*' or simply '*'. The latter is the usual pattern used, and matches any name. The default resolver given when a class is created without explicitly specifying an alternate resolver is ((* <current schema>)(* PUBLIC)). A class with this resolver will be able to resolve names in its own schema or in PUBLIC. In your case you want the referencing class to have a resolver like
((* <current schema>)(* <the other schema>)(* PUBLIC))
or some variation on this. An alternate resolver can be specified in loadjava using the -resolver argument, or in create or alter java ddl using the
resolver ((...)...) syntax. This is all documented in the java developers guide.