Rest API with Docker issue HTTP 500 #6782

aleksgc · 2026-03-13T14:34:31Z

aleksgc
Mar 13, 2026

Hi Guys,

I'm trying to set up simple pipeline exposed through Rest API. I'm using the WebService metadata. The pipeline is fairly simple

I'm expecting to get JSON output like this {"data":[{"constantx":"test_const_value","variablex":"test_var_value"}]}

The webservice is configured in metadata:

Then I start the server just like in the hop tutorial Tutorial:

docker run -it --rm \
--env HOP_LOG_LEVEL=Basic \
--env HOP_PROJECT_FOLDER=/projects \
--env HOP_ENVIRONMENT_CONFIG_FILE_NAME_PATHS='/projects/dev-env-web-config.json' \
--env HOP_SERVER_METADATA_FOLDER='/projects/metadata' \
--env HOP_ENVIRONMENT_NAME='test-env' \
--env HOP_RUN_CONFIG=local \
--env HOP_PROJECT_NAME=my-hop-project \
--env HOP_SERVER_USER=admin \
--env HOP_SERVER_PASS=admin \
--env HOP_SERVER_PORT=8181 \
--env HOP_SERVER_HOSTNAME=0.0.0.0 \
-p 8181:8181 \
--name hop-server-project -v ~/my-hop-project:/projects apache/hop:latest

and try to get the response:

curl admin:admin@localhost:8181/hop/webService/?service=testweb

and the result is:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1"/>
<title>Error 500 jakarta.servlet.ServletException: Error producing web service output</title>
</head>
<body>
<h2>HTTP ERROR 500 jakarta.servlet.ServletException: Error producing web service output</h2>
<table>
<tr><th>URI:</th><td>http://localhost:8181/hop/webService/?service=testwweb</td></tr>
<tr><th>STATUS:</th><td>500</td></tr>
<tr><th>MESSAGE:</th><td>jakarta.servlet.ServletException: Error producing web service output</td></tr>
</table>
<hr/><a href="https://jetty.org/">Powered by Jetty:// 12.1.2</a><hr/>

</body>
</html>

What am I missing?
Where can I find some logs as I can't find anything related to that 500.

Answered by bamaer

Mar 13, 2026

try checking the Enabled option in your web service.

View full answer

bamaer · 2026-03-13T14:54:51Z

bamaer
Mar 13, 2026
Collaborator

try checking the Enabled option in your web service.

1 reply

aleksgc Mar 16, 2026
Author

it worked, thanks

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Rest API with Docker issue HTTP 500 #6782

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bamaer Mar 13, 2026 Collaborator

Uh oh!

aleksgc Mar 16, 2026 Author

aleksgc
Mar 13, 2026

Replies: 1 comment 1 reply

bamaer
Mar 13, 2026
Collaborator

aleksgc Mar 16, 2026
Author