Question

如果我在一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，其中多个线程同时在同一个集合上读取/写入。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。它发生在同一个API上，我使用FindOne函数调用从数据库中获取一条记录。

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)

Answer 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从多个线程访问相同的数据。

使用springframework mongotemplate findone api时的并发修改异常

1 个答案: