Fix examples from the latest updates. (#1495)

Author: jkwatson

examples/grpc/build.gradle

@@ -12,6 +12,12 @@ dependencies {
     compile "io.grpc:grpc-protobuf:${grpcVersion}"
     compile "io.grpc:grpc-stub:${grpcVersion}"
     compile "io.grpc:grpc-netty-shaded:${grpcVersion}"
+
+    if (JavaVersion.current().isJava9Compatible()) {
+        // Workaround for @javax.annotation.Generated
+        // see: https://github.com/grpc/grpc-java/issues/3633
+        compileOnly "javax.annotation:javax.annotation-api:1.3.2"
+    }
 }
 
 protobuf {

examples/sdk-usage/src/main/java/io/opentelemetry/sdk/example/ConfigureTraceExample.java

@@ -26,6 +26,7 @@
 import io.opentelemetry.sdk.trace.export.SimpleSpanProcessor;
 import io.opentelemetry.trace.Link;
 import io.opentelemetry.trace.Span;
+import io.opentelemetry.trace.Span.Kind;
 import io.opentelemetry.trace.SpanContext;
 import io.opentelemetry.trace.TraceId;
 import io.opentelemetry.trace.Tracer;
@@ -109,15 +110,16 @@ public static void main(String[] args) {
     class MySampler implements Sampler {
 
       @Override
-      public Decision shouldSample(
+      public SamplingResult shouldSample(
           SpanContext parentContext,
           TraceId traceId,
           String name,
-          Span.Kind spanKind,
+          Kind spanKind,
           ReadableAttributes attributes,
           List<Link> parentLinks) {
         // We sample only if the Span name contains "SAMPLE"
-        return Samplers.emptyDecision(name.contains("SAMPLE"));
+        return Samplers.emptySamplingResult(
+            name.contains("SAMPLE") ? Decision.RECORD_AND_SAMPLED : Decision.NOT_RECORD);
       }
 
       @Override