Enumeration over large collection of registered class instances can fail with ClassCastException
IF:
1. Using registerStub to establish a correspondence between a java and GS Smalltalk class
2. Enumerating over a collection of instances of this class replicated from the server
3. The size of the preload buffer (set in GbjSession.initialize( ) ) is smaller than the number of objects in the replicated collection
THEN:
The retrieval of elements that were not preloaded will fail with a java.lang.ClassCastException.
Example:
GbjSession s;
// ( code to login session s here )
s.registerStub(new TestObject(), "TestObject");
GbjCollection c = (GbjCollection)s.doit( <code to return large collection of TestObjects> );
for (Enumeration e = c.elements(); e.hasMoreElements(); ) {
TestObject x = (TestObject)e.nextElement(); << will fail here
}
Workaround
If feasible, increase the size of the preload buffer to accomodate the full collection.
If not practical, refactor code to retrieve a subsection of the full collection in batches that are small enough to fit in the preload buffer.
Last updated: 4/2/20