Update OTel Java with HTTP exporter (#319)

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: michal <michal@axiom.co>

Author: 3 people

guides/opentelemetry-java.mdx

@@ -188,11 +188,6 @@ Update the `pom.xml` file in the root of your project directory with the followi
       <artifactId>opentelemetry-exporter-otlp</artifactId>
       <version>${opentelemetry.version}</version>
     </dependency>
-    <dependency>
-      <groupId>io.grpc</groupId>
-      <artifactId>grpc-netty-shaded</artifactId>
-      <version>1.42.1</version>
-    </dependency>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
@@ -305,14 +300,14 @@ package com.example;
 import io.opentelemetry.api.OpenTelemetry;
 import io.opentelemetry.api.trace.Tracer;
 import io.opentelemetry.context.Scope;
-import io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporter;
+import io.opentelemetry.exporter.otlp.http.trace.OtlpHttpSpanExporter;
 import io.opentelemetry.sdk.OpenTelemetrySdk;
 import io.opentelemetry.sdk.trace.SdkTracerProvider;
 import io.opentelemetry.sdk.trace.export.BatchSpanProcessor;
 
 public class OtelConfiguration {
     public static OpenTelemetry initializeOpenTelemetry() {
-        OtlpGrpcSpanExporter spanExporter = OtlpGrpcSpanExporter.builder()
+        OtlpHttpSpanExporter spanExporter = OtlpHttpSpanExporter.builder()
             .setEndpoint("https://AXIOM_DOMAIN/v1/traces")
             .addHeader("Authorization", "Bearer API_TOKEN")
             .addHeader("X-Axiom-Dataset", "DATASET_NAME")