Fix/bytes encoder cast exception (#15262)

* fix provider get baggage error

* fix BytesEncoder Cast Exception

* add zipkin-sender-urlconnection default

* format code

---------

Co-authored-by: songlusheng <songlusheng@bilibili.com>

Author: songxiaosheng

dubbo-spring-boot-project/dubbo-spring-boot-autoconfigure/src/main/java/org/apache/dubbo/spring/boot/autoconfigure/observability/zipkin/ZipkinAutoConfiguration.java

@@ -67,4 +67,11 @@ public class ZipkinAutoConfiguration {
     public BytesEncoder<Span> spanBytesEncoder() {
         return SpanBytesEncoder.JSON_V2;
     }
+
+    @Bean
+    @ConditionalOnProperty(prefix = DUBBO_TRACING_ZIPKIN_CONFIG_PREFIX, name = "endpoint")
+    @ConditionalOnMissingBean
+    public zipkin2.reporter.BytesEncoder<Span> reporterBytesEncoder() {
+        return zipkin2.reporter.SpanBytesEncoder.JSON_V2;
+    }
 }

dubbo-spring-boot-project/dubbo-spring-boot-autoconfigure/src/main/java/org/apache/dubbo/spring/boot/autoconfigure/observability/zipkin/ZipkinConfigurations.java

@@ -133,8 +133,8 @@ static class ReporterConfiguration {
         @Bean
         @ConditionalOnMissingBean
         @ConditionalOnBean(Sender.class)
-        AsyncReporter<Span> spanReporter(Sender sender, BytesEncoder<Span> encoder) {
-            return AsyncReporter.builder(sender).build((zipkin2.reporter.BytesEncoder<Span>) encoder);
+        AsyncReporter<Span> spanReporter(Sender sender, zipkin2.reporter.BytesEncoder<Span> encoder) {
+            return AsyncReporter.builder(sender).build(encoder);
         }
     }
 

dubbo-spring-boot-project/dubbo-spring-boot-starters/dubbo-tracing-brave-zipkin-spring-boot-starter/pom.xml

@@ -46,6 +46,10 @@
       <groupId>io.zipkin.zipkin2</groupId>
       <artifactId>zipkin</artifactId>
     </dependency>
+    <dependency>
+      <groupId>io.zipkin.reporter2</groupId>
+      <artifactId>zipkin-sender-urlconnection</artifactId>
+    </dependency>
   </dependencies>
 
 </project>