add comments of springboot 3.0 minimum JDK version (#3906)

content/en/docs/languages/java/instrumentation.md

@@ -42,6 +42,15 @@ manual instrumentation.
 You don't have to use the example app: if you want to instrument your own app or
 library, follow the instructions here to adapt the process to your own code.
 
+### Prerequisites
+
+For running the example app, ensure that you have the following installed
+locally:
+
+- Java JDK 17+, due to the use of Spring Boot 3. OpenTelemetry Java itself only
+  [requires Java 8+][java-vers].
+- [Gradle](https://gradle.org/).
+
 ### Dependencies {#example-app-dependencies}
 
 To begin, set up an environment in a new directory called `java-simple`. Within
@@ -1822,6 +1831,8 @@ io.opentelemetry.sdk.trace.export.BatchSpanProcessor = io.opentelemetry.extensio
   https://github.com/open-telemetry/opentelemetry-java/blob/main/sdk/trace/src/main/java/io/opentelemetry/sdk/trace/samplers/AlwaysOnSampler.java
 [httpexchange]:
   https://docs.oracle.com/javase/8/docs/jre/api/net/httpserver/spec/com/sun/net/httpserver/HttpExchange.html
+[java-vers]:
+  https://github.com/open-telemetry/opentelemetry-java/blob/main/VERSIONING.md#language-version-compatibility
 [instrumentation library]: /docs/specs/otel/glossary/#instrumentation-library
 [instrumented library]: /docs/specs/otel/glossary/#instrumented-library
 [logs bridge API]: /docs/specs/otel/logs/bridge-api

static/refcache.json

@@ -5083,6 +5083,10 @@
     "StatusCode": 206,
     "LastSeen": "2024-01-18T19:02:52.895666-05:00"
   },
+  "https://maven.apache.org/": {
+    "StatusCode": 206,
+    "LastSeen": "2024-02-15T17:43:36.624023547Z"
+  },
   "https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html#bill-of-materials-bom-poms": {
     "StatusCode": 206,
     "LastSeen": "2024-01-30T16:15:00.07395-05:00"