Question about XThis

I encounter a problem when obtaining Java object from beanshell script. The
error shows

java.lang.ClassCastException: bsh.XThis cannot be cast to
example.TransactionService

code snippet used to create that instance is

init_txservice(){

	import example.TransactionService;

	ts = new TransactionService(accountdao.initialize());

	return this;
}

txservice = init_txservice();

After re-reading the bsh docs, in `Scripted Objects '
(http://www.beanshell.org/manual/bshmanual.html ) it says that this can be
used to create scripted object using method closures. So it looks like my
code to create txservice is not correct; And when I switch to return ts ( ts
= new TransactionServcie(...) ) the error seems to go away. 

But now a question raises. I use `return this' in other method closure which
has similar way to return instance, but why other code snippet does not
throw the same error i.e. ClassCastException?

Other code like 

init_mock_datasource(){

	import org.clin4j.framework.domain.mock.Driver;
	
        d = "com.mockdb.jdbc.Driver";
        url = "jdbc:mockdb://localhost/ecommerce";
        id = "user";
        pass = "password";

	driver = new Driver(d, url, id, pass);

	return this;
}


when objecting java object using this code snippet, everything works well.

Does any reason can explain this problem? 

Thanks for help.
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