[dubbo] branch 3.0 updated: Fix npe in zone aware invoker (#9851)

[guohao]

This is an automated email from the ASF dual-hosted git repository.

guohao pushed a commit to branch 3.0
in repository https://gitbox.apache.org/repos/asf/dubbo.git


The following commit(s) were added to refs/heads/3.0 by this push:
     new 29becdc  Fix npe in zone aware invoker (#9851)
29becdc is described below

commit 29becdc22af9a3e0e9d7367eeed4b65b082c8cd3
Author: GuoHao <guohao...@gmail.com>
AuthorDate: Tue Mar 29 13:59:18 2022 +0800

    Fix npe in zone aware invoker (#9851)
---
 .../dubbo/rpc/cluster/support/registry/ZoneAwareClusterInvoker.java     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git 
a/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/support/registry/ZoneAwareClusterInvoker.java
 
b/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/support/registry/ZoneAwareClusterInvoker.java
index b4bd540..1a40c68 100644
--- 
a/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/support/registry/ZoneAwareClusterInvoker.java
+++ 
b/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/support/registry/ZoneAwareClusterInvoker.java
@@ -100,7 +100,7 @@ public class ZoneAwareClusterInvoker<T> extends 
AbstractClusterInvoker<T> {
 
         // load balance among all registries, with registry weight count in.
         Invoker<T> balancedInvoker = select(loadbalance, invocation, invokers, 
null);
-        if (balancedInvoker.isAvailable()) {
+        if (balancedInvoker!=null && balancedInvoker.isAvailable()) {
             return balancedInvoker.invoke(invocation);
         }