diff --git a/instrumentation/jaxrs/jaxrs-2.0/jaxrs-2.0-common/testing/src/main/java/io/opentelemetry/instrumentation/jaxrs/v2_0/test/Resource.java b/instrumentation/jaxrs/jaxrs-2.0/jaxrs-2.0-common/testing/src/main/java/io/opentelemetry/instrumentation/jaxrs/v2_0/test/Resource.java
index 38dceb0991c2..491cf9537e22 100644
--- a/instrumentation/jaxrs/jaxrs-2.0/jaxrs-2.0-common/testing/src/main/java/io/opentelemetry/instrumentation/jaxrs/v2_0/test/Resource.java
+++ b/instrumentation/jaxrs/jaxrs-2.0/jaxrs-2.0-common/testing/src/main/java/io/opentelemetry/instrumentation/jaxrs/v2_0/test/Resource.java
@@ -5,13 +5,17 @@
 
 package io.opentelemetry.instrumentation.jaxrs.v2_0.test;
 
+import static javax.ws.rs.core.MediaType.TEXT_PLAIN;
+
 import javax.ws.rs.POST;
 import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
 
 @Path("/ignored")
 public interface Resource {
   @Path("ignored")
+  @Produces(TEXT_PLAIN)
   String hello(String name);
 
   @Path("/test")
@@ -19,6 +23,7 @@ interface SubResource extends Cloneable, Resource {
     @Override
     @POST
     @Path("/hello/{name}")
+    @Produces(TEXT_PLAIN)
     String hello(@PathParam("name") String name);
   }
 
@@ -42,12 +47,14 @@ class Test3 implements SubResource {
     @Override
     @POST
     @Path("/hi/{name}")
+    @Produces(TEXT_PLAIN)
     public String hello(@PathParam("name") String name) {
       return "Test3 " + name + "!";
     }
 
     @POST
     @Path("/nested")
+    @Produces(TEXT_PLAIN)
     public String nested() {
       return hello("nested");
     }
diff --git a/instrumentation/jaxrs/jaxrs-3.0/jaxrs-3.0-common/testing/src/main/java/io/opentelemetry/instrumentation/jaxrs/v3_0/test/Resource.java b/instrumentation/jaxrs/jaxrs-3.0/jaxrs-3.0-common/testing/src/main/java/io/opentelemetry/instrumentation/jaxrs/v3_0/test/Resource.java
index bae7536b2d7b..ed90e67cd40d 100644
--- a/instrumentation/jaxrs/jaxrs-3.0/jaxrs-3.0-common/testing/src/main/java/io/opentelemetry/instrumentation/jaxrs/v3_0/test/Resource.java
+++ b/instrumentation/jaxrs/jaxrs-3.0/jaxrs-3.0-common/testing/src/main/java/io/opentelemetry/instrumentation/jaxrs/v3_0/test/Resource.java
@@ -5,13 +5,17 @@
 
 package io.opentelemetry.instrumentation.jaxrs.v3_0.test;
 
+import static jakarta.ws.rs.core.MediaType.TEXT_PLAIN;
+
 import jakarta.ws.rs.POST;
 import jakarta.ws.rs.Path;
 import jakarta.ws.rs.PathParam;
+import jakarta.ws.rs.Produces;
 
 @Path("/ignored")
 public interface Resource {
   @Path("ignored")
+  @Produces(TEXT_PLAIN)
   String hello(String name);
 
   @Path("/test")
@@ -19,6 +23,7 @@ interface SubResource extends Cloneable, Resource {
     @Override
     @POST
     @Path("/hello/{name}")
+    @Produces(TEXT_PLAIN)
     String hello(@PathParam("name") String name);
   }
 
@@ -42,12 +47,14 @@ class Test3 implements SubResource {
     @Override
     @POST
     @Path("/hi/{name}")
+    @Produces(TEXT_PLAIN)
     public String hello(@PathParam("name") String name) {
       return "Test3 " + name + "!";
     }
 
     @POST
     @Path("/nested")
+    @Produces(TEXT_PLAIN)
     public String nested() {
       return hello("nested");
     }