HashMap is not thread safe, if multiple threads try to access the same HashMap object and modify it at the same time, it may lead to unexpected behavior, it's better to use ConcurrentHashMap in concurrent environments. Treeification of Hashmap In Java 8, the HashMap implementation has ...
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290) at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020) at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656) at java.base/java.util.concurrent.ForkJoinPoo...
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[na:na] at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[na:na] at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[na:na] at ja...
@EntitypublicclassMessage{privatestaticMap<String,Query<Message>>queryMap=newConcurrentHashMap<>(5);publicstaticList<Message>getMsgList(Stringsid,booleanisDesc) {try{StringkeyName="getMsgList".concat(isDesc?"1":"2");Query<Message>query=queryMap.get(keyName);if(query==null) {QueryBuilder<Messa...
HashMap和ConcurrentHashMap 注:本文出自“石杉的架构笔记”微信公众号。
*在 #doSubscribe(url, notifyListener) 方法中,*/privatefinalSet<String> anyServices =newConcurrentHashSet<>();/*** 监听器集合*/privatefinalConcurrentMap<URL, ConcurrentMap<NotifyListener, ChildListener>> zkListeners =newConcurrentHashMap<>();/*** zookeeper客户端*/privatefinalZookeeperClient zkClient...
[spring-core-5.1.10.RELEASE.jar:5.1.10.RELEASE] at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1688) ~[na:1.8.0_181] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:738) ~[...
{ Map<String, Object> config = new ConcurrentHashMap<>(); config.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaServers); config.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class); config.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class); config.put(...
import java.util.TreeMap; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.TimeUnit; @@ -142,20 +144,22 @@ public boolean invokeBuild(int kind, String targetName, IAutoBuildConfigurationD boolean lastSequenceID = true; // Run preBui...
Post debugging, i found that once it tries to create all configuration like Connection Pool, Selection Strategy..etc, everything comes fines except ConcurrentHashMap<Host, HostToken>. This map comes with null value hence there is no host token available error. Need Immediate help: Code Reference...