JSON can't serialize Enum when printing Query in DEBUG message [DATAMONGO-495]

[spring-projects-issues]

William Voorsluys opened DATAMONGO-495 and commented

I'm trying to execute the following code to query MongoDB where the field 'type' is an Enum.

this.getOperations().find(new Query(Criteria.where("type").is(type)), ComponentDefinition.class);

I get an error saying the class can't be serialized (see exception below).

But I noticed the error only happens when the log level is set to DEBUG, when a line in MongoTemplate.java attempts to add the Query to a debug message. The serialization error is then triggered by toString() of BasicDBObject. The exception thrown is:

java.lang.RuntimeException: json can't serialize type : class au.org.aurin.workflow.datamodel.ComponentType
	at com.mongodb.util.JSON.serialize(JSON.java:261)
	at com.mongodb.util.JSON.serialize(JSON.java:141)
	at com.mongodb.util.JSON.serialize(JSON.java:58)
	at com.mongodb.BasicDBObject.toString(BasicDBObject.java:84)
	at java.lang.String.valueOf(String.java:2902)
	at java.lang.StringBuilder.append(StringBuilder.java:128)
	at org.springframework.data.mongodb.core.MongoTemplate.doFind(MongoTemplate.java:1241)
	at org.springframework.data.mongodb.core.MongoTemplate.doFind(MongoTemplate.java:1233)
	at org.springframework.data.mongodb.core.MongoTemplate.find(MongoTemplate.java:471)
	at org.springframework.data.mongodb.core.MongoTemplate.find(MongoTemplate.java:466)
	at au.org.aurin.workflow.persistence.ComponentRepository.getByType(ComponentRepository.java:42)

When log level is set to INFO, the problem doesn't appear. The enum value is serialized as expected in all DB operations.

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Affects: 1.0.3, 1.1 M2

Referenced from: commits 594ddbd, 04a17ca