PMT-9: Move Template to Config Bean, so it can be reused by Generated Code

src/main/java/de/hmmh/pmt/Config.java

@@ -0,0 +1,13 @@
+package de.hmmh.pmt;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.client.RestTemplate;
+
+@Configuration
+public class Config {
+    @Bean
+    public RestTemplate restTemplate() {
+        return new RestTemplate();
+    }
+}

src/main/java/de/hmmh/pmt/auth/JWT.java

@@ -2,6 +2,7 @@ package de.hmmh.pmt.auth;
 
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.GrantedAuthority;
@@ -25,7 +26,8 @@ public class JWT implements LogoutHandler {
     private static final String OIDC_LOGOUT_ROUTE = "/protocol/openid-connect/logout";
     private static final String OIDC_TOKEN_HINT_QUERY_PARAMETER = "id_token_hin";
 
-    private final RestTemplate template = new RestTemplate();
+    @Autowired
+    private RestTemplate template;
 
     @Override
     public void logout(HttpServletRequest request, HttpServletResponse response, Authentication authentication) {