fix(cloud): add a CacheManager bean which allows null values #1610

Author: MarkPotato777

server/odc-service/src/main/java/com/oceanbase/odc/config/CacheConfiguration.java

@@ -26,6 +26,7 @@
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Lazy;
+import org.springframework.context.annotation.Primary;
 
 import com.github.benmanes.caffeine.cache.Caffeine;
 import com.github.benmanes.caffeine.cache.LoadingCache;
@@ -79,6 +80,7 @@ public LoadingCache<Long, List<Rule>> rulesetId2RulesCache() {
     }
 
     @Bean("defaultCacheManager")
+    @Primary
     public CacheManager defaultCacheManager() {
         Caffeine<Object, Object> caffeine = Caffeine.newBuilder().maximumSize(1000).expireAfterWrite(
                 Duration.ofSeconds(600));
@@ -88,4 +90,14 @@ public CacheManager defaultCacheManager() {
         return cacheManager;
     }
 
+    @Bean("allowNullCacheManager")
+    public CacheManager allowNullCacheManager() {
+        Caffeine<Object, Object> caffeine = Caffeine.newBuilder().maximumSize(1000).expireAfterWrite(
+                Duration.ofSeconds(600));
+        CaffeineCacheManager cacheManager = new CaffeineCacheManager();
+        cacheManager.setAllowNullValues(true);
+        cacheManager.setCaffeine(caffeine);
+        return cacheManager;
+    }
+
 }