Fix spring spi extension keeps printing warn log during starting.

dubbo-common/src/main/java/org/apache/dubbo/common/config/ConfigurationUtils.java

@@ -102,9 +102,7 @@ public static String getProperty(String property, String defaultValue) {
 
     public static Map<String, String> parseProperties(String content) throws IOException {
         Map<String, String> map = new HashMap<>();
-        if (StringUtils.isEmpty(content)) {
-            logger.warn("You specified the config center, but there's not even one single config item in it.");
-        } else {
+        if (StringUtils.isNotEmpty(content)) {
             Properties properties = new Properties();
             properties.load(new StringReader(content));
             properties.stringPropertyNames().forEach(

dubbo-common/src/main/java/org/apache/dubbo/config/context/ConfigManager.java

@@ -18,6 +18,7 @@
 
 import org.apache.dubbo.common.context.FrameworkExt;
 import org.apache.dubbo.common.context.LifecycleAdapter;
+import org.apache.dubbo.common.extension.DisableInject;
 import org.apache.dubbo.common.logger.Logger;
 import org.apache.dubbo.common.logger.LoggerFactory;
 import org.apache.dubbo.common.utils.CollectionUtils;
@@ -75,7 +76,7 @@ public ConfigManager() {
     }
 
     // ApplicationConfig correlative methods
-
+    @DisableInject
     public void setApplication(ApplicationConfig application) {
         addConfig(application, true);
     }
@@ -90,6 +91,7 @@ public ApplicationConfig getApplicationOrElseThrow() {
 
     // MonitorConfig correlative methods
 
+    @DisableInject
     public void setMonitor(MonitorConfig monitor) {
         addConfig(monitor, true);
     }
@@ -99,7 +101,7 @@ public Optional<MonitorConfig> getMonitor() {
     }
 
     // ModuleConfig correlative methods
-
+    @DisableInject
     public void setModule(ModuleConfig module) {
         addConfig(module, true);
     }
@@ -108,6 +110,7 @@ public Optional<ModuleConfig> getModule() {
         return ofNullable(getConfig(getTagName(ModuleConfig.class)));
     }
 
+    @DisableInject
     public void setMetrics(MetricsConfig metrics) {
         addConfig(metrics, true);
     }
@@ -116,6 +119,7 @@ public Optional<MetricsConfig> getMetrics() {
         return ofNullable(getConfig(getTagName(MetricsConfig.class)));
     }
 
+    @DisableInject
     public void setSsl(SslConfig sslConfig) {
         addConfig(sslConfig, true);
     }

dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/bootstrap/DubboBootstrap.java

@@ -74,6 +74,7 @@
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.Set;
 import java.util.SortedSet;
 import java.util.concurrent.CompletableFuture;
@@ -892,8 +893,17 @@ private DynamicConfiguration prepareEnvironment(ConfigCenterConfig configCenter)
             }
             try {
                 environment.setConfigCenterFirst(configCenter.isHighestPriority());
-                environment.updateExternalConfigurationMap(parseProperties(configContent));
-                environment.updateAppExternalConfigurationMap(parseProperties(appConfigContent));
+                Map<String, String> globalRemoteProperties = parseProperties(configContent);
+                if (CollectionUtils.isEmptyMap(globalRemoteProperties)) {
+                    logger.info("No global configuration in config center");
+                }
+                environment.updateExternalConfigurationMap(globalRemoteProperties);
+
+                Map<String, String> appRemoteProperties = parseProperties(appConfigContent);
+                if (CollectionUtils.isEmptyMap(appRemoteProperties)) {
+                    logger.info("No application level configuration in config center");
+                }
+                environment.updateAppExternalConfigurationMap(appRemoteProperties);
             } catch (IOException e) {
                 throw new IllegalStateException("Failed to parse configurations from Config Center.", e);
             }

dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/utils/ConfigValidationUtils.java

@@ -420,8 +420,7 @@ public static void validateSslConfig(SslConfig sslConfig) {
     public static void validateMonitorConfig(MonitorConfig config) {
         if (config != null) {
             if (!config.isValid()) {
-                logger.info("There's no valid monitor config found, if you want to open monitor statistics for Dubbo, " +
-                        "please make sure your monitor is configured properly.");
+                logger.info("No valid monitor config found, specify monitor info to enable collection of Dubbo statistics");
             }
 
             checkParameterName(config.getParameters());

dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/RpcInvocation.java

@@ -349,7 +349,6 @@ public void addObjectAttachmentsIfAbsent(Map<String, Object> attachments) {
     }
 
     @Override
-    @Deprecated
     public String getAttachment(String key) {
         if (attachments == null) {
             return null;