languitar opened a new issue #8248:
URL: https://github.com/apache/pulsar/issues/8248
**Describe the bug**
When using the docker image as instructed in the manual for a local test,
registering a schema for a new topic can result in an internal server error if
the posted JSON file contains a `data` attribute. This is likely to happen by
accident as the attribute `data` is used when GET-ing a schema for a topic
instead of the field `schema` that is needed for the POST request
**To Reproduce**
Steps to reproduce the behavior:
1. Execute `docker run -it -p 6650:6650 -p 8080:8080
apachepulsar/pulsar:2.6.1 bin/pulsar standalone`
2. Create `/tmp/data.json` with the following content:
```json
{
"type": "AVRO",
"data": "{\n \"name\": \"Example\",\n \"type\": \"record\",\n
\"fields\": [\n {\n \"name\": \"a\",\n \"type\": [\n \"null\",\n
\"string\"\n ]\n },\n {\n \"name\": \"b\",\n \"type\": [\n
\"null\",\n \"int\"\n ]\n }\n ]\n}",
"properties": {}
}
```
3. Execute `curl -d "@/tmp/data.json" -H "Content-Type: application/json" -X
POST http://localhost:8080/admin/v2/schemas/public/default/my-topic/schema`
This will result in the following response:
```html
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<title>Error 500 Internal Server Error</title>
</head>
<body><h2>HTTP ERROR 500 Internal Server Error</h2>
<table>
<tr><th>URI:</th><td>/admin/v2/schemas/public/default/my-topic/schema</td></tr>
<tr><th>STATUS:</th><td>500</td></tr>
<tr><th>MESSAGE:</th><td>Internal Server Error</td></tr>
<tr><th>SERVLET:</th><td>org.glassfish.jersey.servlet.ServletContainer-69efdfd9</td></tr>
</table>
<hr><a href="http://eclipse.org/jetty";>Powered by Jetty://
9.4.29.v20200521</a><hr/>
</body>
</html>
```
And the server logs:
```
14:03:22.726 [ForkJoinPool.commonPool-worker-9] INFO
org.eclipse.jetty.server.RequestLog - 172.17.1.1 - - [13/Oct/2020:14:03:22
+0000] "POST /admin/v2/schemas/public/default/my-topic/schema HTTP/1.1" 500 573
"-" "curl/7.72.0" 20
```
**Expected behavior**
A descriptive error message is given that the provided data was invalid and
the respective HTTP status code is used to indicate this.
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