Viewing error when invalid

Question

hy i am using call dbms_java.dropjava('D:\oracle\9iDatabase\lib\AppelClient.jar\AppelClient.jar');
to load the class but it marking it as invalid
although if i try to add it as a java source to the database it compiles successfully
is there a way to view the error caused in appelClient.jar that made it invalid?
is there a difference between a java stored procedure and a java source compiled in the database?

Answer 1

dropjava does not load. Presumably you meant loadjava. If so, unless you use the -r (also knowb as -resolve) option, loadjava will not attempt to resolve (also known as validate) the classes that are loaded. It will create them, but leave
them invalid. For java classes, invalid really means "pending resolution". It may be that once a resolution attempt has been made (as would occur if one used -r in loadjava) a class will remain invalid. This then means that there is a problem that prevents resolution, almost always due to some referenced class not being present. One can query the usual error tables, eg USER_ERRORS to get more information. But if a class has been created without there yet having been an attempt to resolve it, it will be in invalid status without any entries in USER_ERRORS. Another way to attempt resolution on a class once it is present
(loaded) is to do ALTER JAVA CLASS "name of the class" RESOLVE;
There should be little difference between loading and compiling source vs
loading and resolving the .class files that result from that source, assuming that all such .class files are included in the load, and all referenced classes are either already present in the database or are also included in the load. That is, if one action results in valid classes, one would expect the other to as well.