* adding sdk tracing capabilities on spring



* fix: guard highCardinalityKeyValue calls against null values in ObservationDaprClient

Micrometer's highCardinalityKeyValue throws NPE when the value is null.
Added a safe() helper that coalesces nulls to empty string, applied to
all observation tag values in both Spring Boot 3 and Boot 4 modules.



* fix: add null validation in constructors and fix license header formatting

Add Objects.requireNonNull for delegate and observationRegistry in
ObservationDaprClient and ObservationDaprWorkflowClient constructors
to fail fast on misconfiguration. Fix missing ' * ' prefix on the
last line of license headers in all four new files.



* fix: defer observation start to subscription time in ObservationDaprClient

Wrap observe() and observeFlux() helpers with Mono.defer/Flux.defer so
that obs.start() runs on subscription, not on method call. This prevents
leaked spans when a Mono is never subscribed and ensures span timing
reflects actual execution, not the gap before subscription.



* fix: use proper Objects import, revert license header, add deferred-start test

Replace fully-qualified java.util.Objects with import statement and fix
alphabetical import order to satisfy checkstyle. Revert license header
change since the project's checkstyle config expects the original format.
Add test verifying that an unsubscribed Mono does not leak an observation.



---------





(cherry picked from commit aa296fa)

Signed-off-by: salaboy <[email protected]>
Signed-off-by: Javier Aliaga <[email protected]>
Co-authored-by: salaboy <[email protected]>
Co-authored-by: Yaron Schneider <[email protected]>
Co-authored-by: Javier Aliaga <[email protected]>

Signed-off-by: Dapr Bot <[email protected]>

…factory (#1763)

* feat: add DaprClient.invokeHttpClient(appId) factory (#1742)

* chore: rewrite invoke/http example to use native HttpClient

The DaprClient.invokeMethod wrappers were deprecated by #1666. Rewrite
the invoke/http sample to use java.net.http.HttpClient through the Dapr
sidecar, demonstrating both URL forms accepted by the sidecar — the
dapr-app-id header against the sidecar base URL, and the explicit
/v1.0/invoke/<app-id>/method/<method> path.

Update the matching README snippet and reduce expected_stdout_lines to
'Done' — the previous expected lines never matched what DemoService
returns (a timestamp).

Signed-off-by: Javier Aliaga <[email protected]>

* feat: add DaprClient.invokeHttpClient(appId) factory

Provides an SDK-native successor to the invokeMethod APIs deprecated by
#1666. DaprClient.invokeHttpClient(appId) returns a DaprInvokeHttpClient
pre-bound to {daprHttpEndpoint}/v1.0/invoke/{appId}/method/ that reuses
the SDK's shared java.net.http.HttpClient and attaches the dapr-api-token
header when configured.

Update the invoke/http example and README to demonstrate the new helper
alongside the raw dapr-app-id header form.

Signed-off-by: Javier Aliaga <[email protected]>

* feat: add DaprBodyPublishers.json helper and invokeHttpClient migration notes

Adds an opt-in DaprBodyPublishers.json(Object) helper backed by the SDK's
default Jackson serializer, matching the JSON encoding the deprecated
DaprClient.invokeMethod APIs applied internally. Eases migration without
re-introducing auto-serialization into the raw HttpClient surface exposed
by invokeHttpClient.

Also fixes the invoke/http example README expected_stdout_lines to match
the new plain-text body sent by the refactored example (Server: message
one instead of Server: "message one"), and adds migration notes to the
DaprClient.invokeHttpClient and DaprInvokeHttpClient Javadoc as well as
the example README.

Signed-off-by: Javier Aliaga <[email protected]>

---------

Signed-off-by: Javier Aliaga <[email protected]>
(cherry picked from commit 9539d70)

* fix: Add missing implementation

Signed-off-by: Javier Aliaga <[email protected]>

---------

Signed-off-by: Javier Aliaga <[email protected]>
Co-authored-by: Javier Aliaga <[email protected]>

…odyPublishers.json scope (#1758) (#1764)

newRequestBuilder now sets the User-Agent header to the SDK version, matching
what the deprecated invokeMethod path emitted via DaprHttp. This is the only
default the SDK can supply that callers cannot, and it is useful for runtime
side triage. Other implicit invokeMethod behaviors (Content-Type default,
request-id, error mapping, trace propagation) are intentionally left to the
caller, since exposing the native HttpClient is the point of the migration.

Also document on DaprBodyPublishers.json that the helper uses the SDK's
default object serializer and is not a wrapper around a configured custom
DaprObjectSerializer. Its only contribution over a plain ofByteArray call is
guaranteeing a length-known BodyPublisher, which keeps the JDK on
Content-Length framing and sidesteps the Transfer-Encoding: chunked race
reported under load.


(cherry picked from commit 43cf7c6)

Signed-off-by: Javier Aliaga <[email protected]>
Co-authored-by: Javier Aliaga <[email protected]>

Signed-off-by: Dapr Bot <[email protected]>

Signed-off-by: Dapr Bot <[email protected]>

Signed-off-by: Dapr Bot <[email protected]>