BatchUpdateException:ORA-00942:TABLE OR VIEW DOES NOT EXIST - oracle

Question

This issue occurred in jdbc batch insert. I queried from an Oracle datasource, parsed the resultset and then inserted into another Oracle datasource. I have got the connect metadata and printed the current username along with url, both are invalid.
But when it went to batch update, I got the ora-00942 exception. I'm pretty sure all above works fine in database. Has anyone encountered this exception and can you give me some advice?
EDIT:
Ok, I got a table named photos for example in REMOTE_USER and I queried from it. It gave me a resultset, then I parse it after that INSERT it to LOCAL_USER.photos. I did query the LOCAL_USER.photos where I logon in from PL/SQL Developer. The interesting thing was I could do the select command but not the insert. Below is some part of code.
conn = datasource.getConnection(); // notice that it was target datasource
DatabaseMetaData connMetaData = conn.getMetaData();
String userName = connMetaData.getUserName();
resultSet = ds.getResultSet();
ResultSetMetaData metaData = resultSet.getMetaData();
int count = metaData.getColumnCount();
String insertSql = generateInsertSql(count, metaData, userName);
// this was generated through metaData , the output should be
// "insert into LOCAL_USER.photos(col1,col2) values(?,...)"
logger.error("insert clause is {}", insertSql);
ps = conn.prepareStatement(insertSql);
conn.setAutoCommit(false);
while (resultSet.next()) { // this was the original datasource
stageTotalNum++;
for (int i = 1; i <= count; i++) {
Object object = resultSet.getObject(i);
dealClobColumn(ps, i, object);
}
ps.addBatch();
if (stageTotalNum % 500L == 0L) {
ps.executeBatch(); // throws batchupdateexception.
ps.clearBatch();
conn.commit();
}
}
ps.executeBatch();
conn.commit();

Answer 1

It should be the blob type column which I didn't handle it the right way.
First I queried from original datasource then got the blob column of the resultset by
conn.getObject(index) . Next I insert the blob column into target datasource by conn.setObject. Of course that way wasn't working at all, so I changed to the following:
conn.setBlob(rs.getBlob(index)).
Although it worked fine in my own environemnt, but when the application ran in remote server, it kept annoying about the 'table or view does not exists'.The third version is:
conn.setBinaryStream(rs.getBlob(index).getBinaryStream());
Ok, this time it worked both my pc and remote server. Thanks to #codeLover's advice and link, it really hepled me and saved my time. Appreciated it!