Oracle single-table constant merge with CLOB using JDBC

create table data (
    id       VARCHAR2(255),
    key      VARCHAR2(255),
    value    CLOB);

merge into data
using (
    select
        ? id,
        ? key,
        ? value
    from
        dual
) val on (
    data.id=val.id
    and data.key=val.key
)
when matched then
    update set data.value = val.value
when not matched then
    insert (id, key, value) values (val.id, val.key, val.value);

ORA-01461: cannot bind a LONG value for insert into a long column

CLOB tempClob = CLOB.createTemporary(conn, true, CLOB.DURATION_SESSION);


// Open the temporary CLOB in readwrite mode to enable writing
tempClob.open(CLOB.MODE_READWRITE);

// Get the output stream to write
Writer tempClobWriter = tempClob.getCharacterOutputStream();

// Write the data into the temporary CLOB
tempClobWriter.write(stringData);

// Flush and close the stream
tempClobWriter.flush();
tempClobWriter.close();

// Close the temporary CLOB
tempClob.close();

myStatement.setCLOB(column.order, tempClob);