topic Copy of Component writes header but no rows in Talend Studio

Copy of Component writes header but no rows

billimmer — Fri, 02 Jan 2026 14:45:42 GMT

Hi Group,

I created my first component. It's just a copy of tPostgresqlOutputBulk called myPostgresqlOutputBulk, with no changes at this point. I published it using the component designer. Then added it to a test job, along with the original component. They should product the same results at this point, but the custom component creates a header with no rows. Any suggestions? I'm on 6.4 TOS.

Here's the Job:

Output from copy of component:

id first last

Output from original

id first last
"cmUKXP" "HF4Siy" "rPd686"
"tnJywb" "sld1O4" "AscYHD"
"58b5fE" "0N6PYi" "idMch2"
"8xVIJT" "m1kecB" "txIcBQ"
"lsHLZ8" "jc4EIF" "kGGhGX"
"mBSj0C" "VdmigW" "OzHrHQ"
"jDFp7S" "HTNldo" "HosVQh"
"qLIHFS" "30qYzR" "AdZsis"
"LxFKit" "9aaURM" "AWsXMK"
"kOlb36" "VoQ23I" "qqOsB1"

Re: Copy of Component writes header but no rows

manodwhb — Tue, 31 Mar 2020 03:06:11 GMT

Why you want to create bulk component, which is already available?

Re: Copy of Component writes header but no rows

billimmer — Tue, 31 Mar 2020 14:02:28 GMT

It is not possible to write an empty string with the provided component. Also, I want to learn about component development.

Re: Copy of Component writes header but no rows

manodwhb — Wed, 01 Apr 2020 08:04:09 GMT

OK.

Re: Copy of Component writes header but no rows

billimmer — Wed, 01 Apr 2020 23:17:16 GMT

Anyone with thoughts? It's strange. When I run in debug, code is generated for the "begin" and "finally" sections. But the "main" code is missing. The main file is there, with it's code, but it's not generated. I only get:

/**
* [mPostgresqlOutputBulk_1 main ] start
*/

currentComponent = "mPostgresqlOutputBulk_1";

tos_count_mPostgresqlOutputBulk_1++;

/**
* [mPostgresqlOutputBulk_1 main ] stop
*/

Re: Copy of Component writes header but no rows

billimmer — Thu, 02 Apr 2020 15:06:27 GMT

Ok, I figured it out.

The original Talend component main.javajet file had this line:

<%@ include file="../templates/Log4j/Log4jFileUtil.javajet"%>

The fix was to change this to:

<%@ include file="@{org.talend.designer.components.localprovider}/components/templates/Log4j/Log4jFileUtil.javajet"%>