Call SimpleArangoRepository.findAllById concurrent with trigger ConcurrentModificationException exception #302
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Thanks for reporting, this is indeed a bug, fixed in d2b66b2 |
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When I try to build up an java app to retrieve data from ArangoDB, there was always an exception happen ConcurrentModificationException when calling SimpleArangoRepository.findAllById with concurrent workers, why? Is this meet expectation? Then what's the best practice to call the findAllById in concurrent environment?
The detailed call process is as following:
// the goal is to find whether the given items are already existing in the database or not. and this check would be called by multiple workers with different IDs.
List existingTiles = new ArrayList<>();
tileRepo.findAllById(tileIds.stream().map(String::valueOf).toList()).forEach(existingTiles::add);
The call stack for the exception is as following:
java.util.ConcurrentModificationException
at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1229)
at com.arangodb.springframework.core.mapping.DefaultArangoPersistentEntity.findAnnotations(DefaultArangoPersistentEntity.java:269)
at com.arangodb.springframework.core.mapping.DefaultArangoPersistentEntity.getIndexes(DefaultArangoPersistentEntity.java:242)
at com.arangodb.springframework.core.mapping.DefaultArangoPersistentEntity.getPersistentIndexes(DefaultArangoPersistentEntity.java:210)
at com.arangodb.springframework.core.template.ArangoTemplate.ensureCollectionIndexes(ArangoTemplate.java:166)
at com.arangodb.springframework.core.template.ArangoTemplate._collection(ArangoTemplate.java:159)
at com.arangodb.springframework.core.template.ArangoTemplate._collection(ArangoTemplate.java:139)
at com.arangodb.springframework.core.template.ArangoTemplate._collection(ArangoTemplate.java:132)
at com.arangodb.springframework.core.template.ArangoTemplate.findAll(ArangoTemplate.java:484)
at com.arangodb.springframework.repository.SimpleArangoRepository.findAllById(SimpleArangoRepository.java:135)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
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