SatyamPandey-07 opened a new issue, #9193:
URL: https://github.com/apache/camel-quarkus/issues/9193
### Bug description
## Description
When configuring a Camel REST DSL route with JSON binding mode
(`bindingMode(RestBindingMode.json)`), if an error occurs during response
marshalling (such as attempting to serialize a POJO containing Java 8
`java.time.LocalDateTime` fields without explicit configuration or encountering
serialization errors), the exception is silently swallowed. Instead of
propagating the exception to the Camel error handler or returning an HTTP 500
Internal Server Error status code to the client, Camel Quarkus returns an HTTP
200 OK with `Content-Type: text/plain` and an empty (0-byte) response body.
## Steps to Reproduce
1. Configure a Camel REST DSL endpoint with JSON binding mode:
```java
rest("/items")
.get("/details")
.bindingMode(RestBindingMode.json)
.to("direct:getDetails");
In direct:getDetails, return a POJO containing an unconfigured date/time
type:
java
from("direct:getDetails")
.process(exchange -> {
exchange.getMessage().setBody(new ItemDetails("Item 1",
LocalDateTime.now()));
});
Send an HTTP GET request to /items/details:
bash
curl -i http://localhost:8080/items/details
Observe that the HTTP response code is 200 OK while the response body is
empty.
## Expected Behavior
Response marshalling failures must not be swallowed. The underlying
InvalidDefinitionException or serialization error should be logged, propagated
to the Camel error handler, and returned to the caller with an HTTP 500 status
code. Additionally, autoDiscoverObjectMapper should default to true in Camel
Quarkus so that the pre-configured Quarkus CDI ObjectMapper (with
JavaTimeModule support) is utilized automatically.
## Actual Behavior / Error Logs
text'''
HTTP/1.1 200 OK
Content-Type: text/plain
Content-Length: 0
Date: Fri, 18 Sep 2026 12:00:00 GMT
[Empty body - No payload returned and no exception reported in HTTP status
or error handler]
Underlying swallowed exception in the runtime log:
text'''
com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Java 8
date/time type `java.time.LocalDateTime` not supported by default: add Module
"com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling
at [Source: UNKNOWN; byte offset: #UNKNOWN]
at
com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:67)
at
com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1330)
at
com.fasterxml.jackson.databind.ser.impl.UnsupportedTypeSerializer.serialize(UnsupportedTypeSerializer.java:35)
## Proposed Fix
Default autoDiscoverObjectMapper to true on the REST DSL Jackson data format
in camel-quarkus-jackson so that the application's Quarkus-configured
ObjectMapper is automatically discovered and used.
Ensure unhandled exceptions occurring in the outbound REST binding pipeline
set Exchange.EXCEPTION_CAUGHT and propagate to the exchange failure path to
produce an HTTP 500 error response.
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