Review fixes for jedis-3.0:javaagent (#18069)

Co-authored-by: otelbot <197425009+otelbot@users.noreply.github.com>

Author: otelbot[bot]

instrumentation/jedis/jedis-3.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/jedis/v3_0/JedisInstrumentation.java

@@ -13,6 +13,7 @@
 import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
 import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
 import io.opentelemetry.javaagent.instrumentation.jedis.JedisRequestContext;
+import javax.annotation.Nullable;
 import net.bytebuddy.asm.Advice;
 import net.bytebuddy.description.type.TypeDescription;
 import net.bytebuddy.matcher.ElementMatcher;
@@ -54,7 +55,8 @@ public static JedisRequestContext<JedisRequest> onEnter() {
     }
 
     @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class, inline = false)
-    public static void onExit(@Advice.Enter JedisRequestContext<JedisRequest> requestContext) {
+    public static void onExit(
+        @Advice.Enter @Nullable JedisRequestContext<JedisRequest> requestContext) {
       if (requestContext != null) {
         requestContext.detachAndEnd();
       }

instrumentation/jedis/jedis-3.0/javaagent/src/test/java/io/opentelemetry/javaagent/instrumentation/jedis/v3_0/Jedis30ClientTest.java

@@ -43,18 +43,18 @@
 @SuppressWarnings("deprecation") // using deprecated semconv
 class Jedis30ClientTest {
   @RegisterExtension
-  static final InstrumentationExtension testing = AgentInstrumentationExtension.create();
+  private static final InstrumentationExtension testing = AgentInstrumentationExtension.create();
 
-  static GenericContainer<?> redisServer =
+  private static final GenericContainer<?> redisServer =
       new GenericContainer<>("redis:6.2.3-alpine").withExposedPorts(6379);
 
-  static String host;
+  private static String host;
 
-  static String ip;
+  private static String ip;
 
-  static int port;
+  private static int port;
 
-  static Jedis jedis;
+  private static Jedis jedis;
 
   @BeforeAll
   static void setup() throws UnknownHostException {