[improve][client] Prevent NullPointException when closing ClientCredentialsFlow (apache#24123)

shibd · shibd · commit 8d9ae133cb6c · 2025-03-26T14:00:45.000+08:00
(cherry picked from commit b402985)
diff --git a/pulsar-client/src/main/java/org/apache/pulsar/client/impl/auth/oauth2/ClientCredentialsFlow.java b/pulsar-client/src/main/java/org/apache/pulsar/client/impl/auth/oauth2/ClientCredentialsFlow.java
@@ -109,7 +109,9 @@ public TokenResult authenticate() throws PulsarClientException {
 
     @Override
     public void close() throws Exception {
-        exchanger.close();
+        if (exchanger != null) {
+            exchanger.close();
+        }
     }
 
     /**

Original file line number	Diff line number	Diff line change
`@@ -109,7 +109,9 @@ public TokenResult authenticate() throws PulsarClientException {`
`109`	`109`
`110`	`110`	`@Override`
`111`	`111`	`public void close() throws Exception {`
`112`		`- exchanger.close();`
	`112`	`+ if (exchanger != null) {`
	`113`	`+ exchanger.close();`
	`114`	`+ }`
`113`	`115`	`}`
`114`	`116`
`115`	`117`	`/**`