Handle NoOpScopes in Context when starting a span through OpenTelemetry (#4823)

* Treat NoOpScopes same as null in OtelSentrySpanProcessor

* changelog

* reset latest changelog entries to unreleased

Author: adinauer

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## 8.24.0-alpha.2
+## Unreleased
 
 ### Features
 
@@ -37,6 +37,8 @@
 - Session Replay: Avoid deadlock when pausing replay if no connection ([#4788](https://github.com/getsentry/sentry-java/pull/4788))
 - Session Replay: Fix capturing roots with no windows ([#4805](https://github.com/getsentry/sentry-java/pull/4805))
 - Session Replay: Fix `java.lang.IllegalArgumentException: width and height must be > 0` ([#4805](https://github.com/getsentry/sentry-java/pull/4805))
+- Handle `NoOpScopes` in `Context` when starting a span through OpenTelemetry ([#4823](https://github.com/getsentry/sentry-java/pull/4823))
+  - This fixes "java.lang.IllegalArgumentException: The DSN is required" when combining WebFlux and OpenTelemetry
 - Session Replay: Do not use recycled screenshots for masking ([#4790](https://github.com/getsentry/sentry-java/pull/4790))
   - This fixes native crashes seen in `Canvas.<init>`/`ScreenshotRecorder.capture`
 

sentry-opentelemetry/sentry-opentelemetry-core/src/main/java/io/sentry/opentelemetry/OtelSentrySpanProcessor.java

@@ -125,7 +125,7 @@ public void onStart(final @NotNull Context parentContext, final @NotNull ReadWri
 
   private IScopes forkScopes(final @NotNull Context context, final @NotNull SpanData span) {
     final @Nullable IScopes scopesFromContext = context.get(SENTRY_SCOPES_KEY);
-    if (scopesFromContext == null) {
+    if (scopesFromContext == null || scopesFromContext.isNoOp()) {
       return Sentry.forkedRootScopes("spanprocessor.new");
     }
     if (isRootSpan(span)) {