horizonzy commented on a change in pull request #8207:
URL: https://github.com/apache/dubbo/pull/8207#discussion_r663355750



##########
File path: 
dubbo-container/dubbo-container-api/src/main/java/org/apache/dubbo/container/Main.java
##########
@@ -61,9 +61,10 @@ public static void main(String[] args) {
             final List<Container> containers = new ArrayList<Container>();
             for (int i = 0; i < args.length; i++) {
                 Container container = LOADER.getExtension(args[i]);
-                if (null != container) {
-                    containers.add(LOADER.getExtension(args[i]));
+                if (null == container) {
+                    throw new IllegalArgumentException("Default extension is 
not configured, but the extension name is 'true'");

Review comment:
       msg can be String.format("The extension is not find, pls check your 
param: %s is match spi", args[i]);

##########
File path: 
dubbo-container/dubbo-container-api/src/main/java/org/apache/dubbo/container/Main.java
##########
@@ -61,9 +61,10 @@ public static void main(String[] args) {
             final List<Container> containers = new ArrayList<Container>();
             for (int i = 0; i < args.length; i++) {
                 Container container = LOADER.getExtension(args[i]);
-                if (null != container) {
-                    containers.add(LOADER.getExtension(args[i]));
+                if (null == container) {
+                    throw new IllegalArgumentException("Default extension is 
not configured, but the extension name is 'true'");
                 }
+                containers.add(LOADER.getExtension(args[i]));

Review comment:
       here can reuse container




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