Error while using JDBCR4 Service Program

I am using Scott Klement's JDBCR4 service program to insert, select and
delete
rows from a Microsoft Sql Server table.

Today, I ran into CEE9901 Application error.

I don't know what to do next, so any help will be appreciated!

As of yesterday; I have test program IMPORT_SKU,
subprocedure $LodArtImp doing the following:

1) delete all rows from a table in ms sql db.

2) select columns from system i table and insert these
values into table "cleared" in step 1)

2) is a loop within a loop:

EXEC SQL FETCH csr1 FOR :mo_dsMax ROWS INTO :mo_ds;

stmt = jdbc_prepstmt(LodConn : 'typical insert');

2)a Dow (Sqlcod = *Zero) And (counter < counterMax);

2)b FOR index = 1 TO mo_dsMax;
typical code to set parms;
rc = jdbc_execprepupd(stmt);
If (rc < 0);
// print rpt error msg, etc
Else;
// increment counter
Endif;
2)b Endfor;

FETCH NEXT FROM csr1 FOR :mo_dsMax ROWS INTO
:mo_ds;

2)a Enddo;

3) print summary/detail rpt depending on parm

For the last several runs, 2a) was run with parm > system i table rows,
so all system i rows are inserted in ms sql server table.

At this point, results meet requirements, except that updates must be
performed as a "transaction".

Early today, I added the following after 2)b Endfor; and
before 2)a FETCH NEXT:

// start: added code #1 ---------------------------
If LodRtnCd;
jdbc_commit(LodConn);
Else;
jdbc_rollback(LodConn);
Endif;
// end: added code #1 ---------------------------

Re-running the program work as intended; inserting all i table rows in ms
sql server.

To test rollback, I added the following in loop 2)b

rc = jdbc_execprepupd(stmt); // the insert

if (rc < 0);
// print rpt error msg, etc
else;
// increment counter
// start: added code #2 ---------------------------
if counter > max;
// print 'Test Rollback'
LodRtnCd = *Off;
Leave; // exit 2/b for loop
endif;
// end: added code #2 ----------------------------
endif;

The test program runs through the Leave; failing as follows:

If LodRtnCd;
jdbc_commit(LodConn);
Else;
jdbc_rollback(LodConn); // CEE9901 Application
error. RNX0301
Endif;

My joblog shows:
RNX0301 unmonitored by JDBCR4 at stmt 216500, instruction X'0000'

An RPG dump shows

ILE RPG FORMATTED DUMP
Program Status Area:
Procedure Name . . . . . . . . . . . . : IMPORT_SKU
Program Name . . . . . . . . . . . . . : IMPORT_SKU
Library . . . . . . . . . . . . . . : USRGDT
Module Name. . . . . . . . . . . . . . : IMPORT_SKU
Program Status . . . . . . . . . . . . : 00202
The call to ended in error (C G D F).
Previous Status . . . . . . . . . . . : 00000
Statement in Error . . . . . . . . . . : 00018800
RPG Routine . . . . . . . . . . . . . : $LODARTI
Number of Parameters . . . . . . . . . : 000
Message Type . . . . . . . . . . . . . : RNX
Additional Message Info . . . . . . . : 0301
Message Data . . . . . . . . . . . . . :
Java exception received when calling Java method.
Status that caused RNX9001 . . . . . . :

Line 18800 in IMPORT_SKU is:

RtnCd = $LodArtImp(conn : 5000 : LoopSec : LodRows);

the following is, I think, the relevant JDBCR4 code....

2157.00 *+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2158.00 * JDBC_Rollback(): Rollback transaction
2159.00 *
2160.00 * conn = (input) Connection to rollback on
2161.00 *+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2162.00 P JDBC_Rollback B export
2163.00 D JDBC_Rollback PI
2164.00 D conn like(Connection)
2165.00 /free
2166.00 rollbackTrn(conn);
2167.00 /end-free
2168.00 P E