问题:

I am trying to execute an aggregate operation using Spring Data MongoDB 3.6-rc4.

Aggregation agg = newAggregation(     lookup("orders", "orderId", "_id", "order")  ); List results = mongoOperations.aggregate(agg, "transactions", BasicDBObject.class).getMappedResults();

But get the following error on running the query

2017-11-24 17:03:41,539 WARN  org.springframework.data.mongodb.core.MongoTemplate : Command execution of { "aggregate" : "transactions" , "pipeline" : [ { "$lookup" : { "from" : "orders" , "localField" : "orderId" , "foreignField" : "_id" , "as" : "order"}}]} failed: The 'cursor' option is required, except for aggregate with the explain argument 2017-11-24 17:03:41,574 ERROR org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessApiUsageException: Command execution failed:  Error [The 'cursor' option is required, except for aggregate with the explain argument], Command = { "aggregate" : "transactions" , "pipeline" : [ { "$lookup" : { "from" : "orders" , "localField" : "orderId" , "foreignField" : "_id" , "as" : "order"}}]}; nested exception is com.mongodb.MongoCommandException: Command failed with error 9: 'The 'cursor' option is required, except for aggregate with the explain argument' on server localhost:27017. The full response is { "ok" : 0.0, "errmsg" : "The 'cursor' option is required, except for aggregate with the explain argument", "code" : 9, "codeName" : "FailedToParse" }] with root cause com.mongodb.MongoCommandException: Command failed with error 9: 'The 'cursor' option is required, except for aggregate with the explain argument' on server localhost:27017. The full response is { "ok" : 0.0, "errmsg" : "The 'cursor' option is required, except for aggregate with the explain argument", "code" : 9, "codeName" : "FailedToParse" }     at com.mongodb.CommandResult.getException(CommandResult.java:80) ~[mongo-java-driver-3.5.0.jar:na]     at com.mongodb.CommandResult.throwOnError(CommandResult.java:94) ~[mongo-java-driver-3.5.0.jar:na]     at org.springframework.data.mongodb.core.MongoTemplate.handleCommandError(MongoTemplate.java:2100) ~[spring-data-mongodb-1.10.8.RELEASE.jar:na]     at org.springframework.data.mongodb.core.MongoTemplate.aggregate(MongoTemplate.java:1577) ~[spring-data-mongodb-1.10.8.RELEASE.jar:na]     at org.springframework.data.mongodb.core.MongoTemplate.aggregate(MongoTemplate.java:1505) ~[spring-data-mongodb-1.10.8.RELEASE.jar:na]

Thanks in advance!!

回答1:

MongoDB changed in 3.6 how the aggregation command works. Aggregations require now a cursor. We adapted Spring Data MongoDB 2.1 but not previous versions.

Aggregations must be invoked through the collection's aggregate(…) method instead of calling the command directly. This is also the reason why we didn't backport the change. executeCommand(…) is no longer called and we don't want to break compatibility in a bugfix release.

The easiest approach for you can be to override the aggregate(…) method and call the appropriate method, DBCollection.aggregate(…) with the mapped aggregation pipeline.

回答2:

I have also faced this type of error when using Mongodb version 3.6.2.

Check your version of org.springframework.data in pom.xml

For me, i have changed org.springframework.data version to 2.0.3.RELEASE and my problem was solved.

回答3:

I was using:

org.springframework.bootspring-boot-starter-parent1.5.8.RELEASE

Then after upgraded my dependency to a higher version, the issue was resolved:

org.springframework.bootspring-boot-starter-parent1.5.10.RELEASE

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