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Fix NPE bug when creating connection group in ConnectionManager 

- The NPE will occur when multiple threads are trying to create the connection group for the same namespace

Signed-off-by: Eric Zhao <sczyh16@gmail.com>
This commit is contained in:
Eric Zhao 2019-01-28 09:49:25 +08:00
parent 412e1ece47
commit cd02fad290
1 changed files with 1 additions and 1 deletions
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2
sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/server/connection/ConnectionManager.java
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@ -55,7 +55,7 @@ public final class ConnectionManager {
ConnectionGroup group = CONN_MAP.get(namespace); ConnectionGroup group = CONN_MAP.get(namespace);
if (group == null) { if (group == null) {
synchronized (CREATE_LOCK) { synchronized (CREATE_LOCK) {
if (CONN_MAP.get(namespace) == null) { if ((group = CONN_MAP.get(namespace)) == null) {
group = new ConnectionGroup(namespace); group = new ConnectionGroup(namespace);
CONN_MAP.put(namespace, group); CONN_MAP.put(namespace, group);
} }