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如果我在单个线程中运行我的程序，我没有看到任何异常。该问题仅发生在多线程环境中，其中多个线程同时读取和写入同一集合。我没有固定的测试用例，因为这是在我的代码的不同位置随机发生的。它发生在我使用FindOne函数调用从数据库中获取一条记录的同一个 API 上。

java.util.ConcurrentModificationException
        at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)
        at java.util.ArrayList$Itr.next(ArrayList.java:831)
        at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:305)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:266)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:230)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readCollectionOrArray(MappingMongoConverter.java:898)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1159)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter.access$200(MappingMongoConverter.java:77)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:1110)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getValueInternal(MappingMongoConverter.java:861)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter$1.doWithPersistentProperty(MappingMongoConverter.java:278)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter$1.doWithPersistentProperty(MappingMongoConverter.java:266)
        at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:307)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:266)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:230)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:190)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:186)
        at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:77)
        at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:2128)
        at org.springframework.data.mongodb.core.MongoTemplate.executeFindOneInternal(MongoTemplate.java:1766)
        at org.springframework.data.mongodb.core.MongoTemplate.doFindOne(MongoTemplate.java:1582)
        at org.springframework.data.mongodb.core.MongoTemplate.findOne(MongoTemplate.java:497)
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1 回答 1

1

您正在运行具有非线程安全功能的多线程代码。您需要添加锁以防止多个线程访问同一数据。

于 2015-04-17T14:35:53.673 回答