Sse difference in empty event between non-reactive and reactive output

[jedla97]

Describe the bug

When sending event with empty data using reactive way the empty data is transformed in null. The same code using non-reactive return just empty data (which I think is correct).

Happening with quarkus-resteasy-reactive-*. More info available in reproducers.

Expected behavior

The reactive and non-reactive should have same output.

Actual behavior

With non-reactive output is

event: name=NOT EMPTY data={random data} and is empty: false
event: name=EMPTY data={} and is empty: true

With reactive output is

event: name=NOT EMPTY data={random data} and is empty: false
event: name=EMPTY data={null} and is empty: true

How to Reproduce?

For non-reactive

1. git clone -b sse-non-reactive git@github.com:jedla97/quarkus-reproducers.git
2. cd quarkus-reproducers
3. mvn quarkus:dev -Dquarkus.platform.version=3.5.1
4. Go to http://127.0.0.1:8080/sse/client

For reactive

1. git checkout sse-native-method-404
2. mvn quarkus:dev -Dquarkus.platform.version=3.5.1
3. Go to http://127.0.0.1:8080/sse/client

The output is show in actual behavior section

Output of uname -a or ver

No response

Output of java -version

No response

Quarkus version or git rev

No response

Build tool (ie. output of mvnw --version or gradlew --version)

No response

Additional information

No response

[quarkus-bot]

/cc @FroMage (resteasy-reactive), @stuartwdouglas (resteasy-reactive)

[geoand]

#37036 fixes the issue

[michalvavrik]

#35990 was backported, so I think this one should be as well

[quarkus-bot]

@michalvavrik triage/backport* labels may not be added to an issue. Please add them to the corresponding pull request.

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[michalvavrik]

@michalvavrik triage/backport* labels may not be added to an issue. Please add them to the corresponding pull request.

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sorry