change to openjdk21

Author: chengyouling

demo/demo-schema/src/main/java/org/apache/servicecomb/demo/CodeFirstRestTemplate.java

@@ -21,13 +21,10 @@
 import java.util.HashMap;
 import java.util.Map;
 
-import org.apache.servicecomb.common.rest.codec.produce.ProduceProcessorManager;
 import org.apache.servicecomb.core.Const;
 import org.apache.servicecomb.demo.compute.Person;
 import org.apache.servicecomb.demo.ignore.InputModelForTestIgnore;
 import org.apache.servicecomb.demo.ignore.OutputModelForTestIgnore;
-import org.apache.servicecomb.demo.jaxbbean.JAXBJob;
-import org.apache.servicecomb.demo.jaxbbean.JAXBPerson;
 import org.apache.servicecomb.demo.server.User;
 import org.apache.servicecomb.foundation.test.scaffolding.config.ArchaiusUtils;
 import org.apache.servicecomb.registry.RegistrationManager;
@@ -37,7 +34,6 @@
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatusCode;
-import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.client.RestTemplate;
 

demo/docker-build-config/pom.xml

@@ -42,7 +42,7 @@
                 <name>${project.artifactId}:${project.version}</name>
                 <alias>${project.artifactId}</alias>
                 <build>
-                  <from>openjdk:17-alpine</from>
+                  <from>openjdk:21-alpine</from>
                   <ports>
                     <port>7070</port>
                     <port>8080</port>