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fix bug

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This commit is contained in:
Looly 2022-05-27 20:17:41 +08:00
parent c72ff2c292
commit 29a561fbcf
2 changed files with 10 additions and 1 deletions
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1
CHANGELOG.md
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@ -20,6 +20,7 @@
* 【db 】 修复count查询别名问题（issue#I590YB@Gitee）
* 【json 】 修复json中byte[]无法转换问题（issue#I59LW4@Gitee）
* 【core 】 修复NumberUtil.isXXX未判空问题（issue#2350@Github）
* 【core 】 修复Singleton中ConcurrentHashMap在JDK8下的bug引起的可能的死循环问题（issue#2349@Github）
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10
hutool-core/src/main/java/cn/hutool/core/lang/Singleton.java
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@ -52,7 +52,15 @@ public final class Singleton {
*/
@SuppressWarnings("unchecked")
public static <T> T get(String key, Func0<T> supplier) {
return (T) POOL.computeIfAbsent(key, (k)-> supplier.callWithRuntimeException());
//return (T) POOL.computeIfAbsent(key, (k)-> supplier.callWithRuntimeException());
// issues#2349
// ConcurrentHashMap.computeIfAbsent在某些情况下会导致死循环问题，此处采用Dubbo的解决方案
Object value = POOL.get(key);
if(null == value){
POOL.putIfAbsent(key, supplier.callWithRuntimeException());
value = POOL.get(key);
}
return (T) value;
}
/**