Error in type resolution of reference type (`Optional`)

[adrianriley]

JaxbAnnotationIntrospector.findPropertyContentTypeResolver expects to be called with a container type, but is being called with a reference type (specifically an Optional) when parsing DropWizard configuration. Here's the stack trace

Caused by: io.dropwizard.configuration.ConfigurationParsingException: /home/developer/projects/employee-service/employee-service-parent/employee-service/target/test-classes/config.yml has an error:
  * Failed to parse configuration at: metrics.reporters; Must call method with a container type (got [reference type, class java.util.Optional<io.dropwizard.util.Duration<[simple type, class io.dropwizard.util.Duration]>])
 at [Source: N/A; line: -1, column: -1] (through reference chain: coop.employee.EmployeeServiceConfiguration["metrics"]->io.dropwizard.metrics.MetricsFactory["reporters"])

    at io.dropwizard.configuration.ConfigurationParsingException$Builder.build(ConfigurationParsingException.java:276)
    at io.dropwizard.configuration.YamlConfigurationFactory.build(YamlConfigurationFactory.java:152)
    at io.dropwizard.configuration.YamlConfigurationFactory.build(YamlConfigurationFactory.java:87)
    at io.dropwizard.cli.ConfiguredCommand.parseConfiguration(ConfiguredCommand.java:124)
    at io.dropwizard.cli.ConfiguredCommand.run(ConfiguredCommand.java:72)
    at io.dropwizard.testing.DropwizardTestSupport.startIfRequired(DropwizardTestSupport.java:194)
    ... 18 more
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Must call method with a container type (got [reference type, class java.util.Optional<io.dropwizard.util.Duration<[simple type, class io.dropwizard.util.Duration]>])
 at [Source: N/A; line: -1, column: -1] (through reference chain: coop.employee.EmployeeServiceConfiguration["metrics"]->io.dropwizard.metrics.MetricsFactory["reporters"])
    at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:290)
    at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:269)
    at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
    at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
    at com.fasterxml.jackson.databind.DeserializationContext.findContextualValueDeserializer(DeserializationContext.java:444)
    at com.fasterxml.jackson.databind.jsontype.impl.TypeDeserializerBase._findDeserializer(TypeDeserializerBase.java:183)
    at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer._deserializeTypedForId(AsPropertyTypeDeserializer.java:106)
    at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:91)
    at com.fasterxml.jackson.databind.deser.AbstractDeserializer.deserializeWithType(AbstractDeserializer.java:142)
    at com.fasterxml.jackson.datatype.guava.deser.GuavaImmutableCollectionDeserializer._deserializeContents(GuavaImmutableCollectionDeserializer.java:44)
    at com.fasterxml.jackson.datatype.guava.deser.GuavaImmutableCollectionDeserializer._deserializeContents(GuavaImmutableCollectionDeserializer.java:14)
    at com.fasterxml.jackson.datatype.guava.deser.GuavaCollectionDeserializer.deserialize(GuavaCollectionDeserializer.java:103)
    at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:490)
    at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:95)
    at com.fasterxml.jackson.module.afterburner.deser.SuperSonicBeanDeserializer.deserialize(SuperSonicBeanDeserializer.java:156)
    at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:490)
    at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:95)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:224)
    at com.fasterxml.jackson.module.afterburner.deser.SuperSonicBeanDeserializer.deserialize(SuperSonicBeanDeserializer.java:152)
    at com.fasterxml.jackson.databind.ObjectMapper._readValue(ObjectMapper.java:3779)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2050)
    at io.dropwizard.configuration.YamlConfigurationFactory.build(YamlConfigurationFactory.java:123)
    ... 22 more
Caused by: java.lang.IllegalArgumentException: Must call method with a container type (got [reference type, class java.util.Optional<io.dropwizard.util.Duration<[simple type, class io.dropwizard.util.Duration]>])
    at com.fasterxml.jackson.module.jaxb.JaxbAnnotationIntrospector.findPropertyContentTypeResolver(JaxbAnnotationIntrospector.java:567)
    at com.fasterxml.jackson.databind.introspect.AnnotationIntrospectorPair.findPropertyContentTypeResolver(AnnotationIntrospectorPair.java:233)
    at com.fasterxml.jackson.databind.introspect.AnnotationIntrospectorPair.findPropertyContentTypeResolver(AnnotationIntrospectorPair.java:233)
    at com.fasterxml.jackson.databind.deser.BasicDeserializerFactory.findPropertyContentTypeDeserializer(BasicDeserializerFactory.java:1516)
    at com.fasterxml.jackson.databind.deser.BasicDeserializerFactory.resolveType(BasicDeserializerFactory.java:1886)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.constructSettableProperty(BeanDeserializerFactory.java:717)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.addBeanProps(BeanDeserializerFactory.java:504)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.buildBeanDeserializer(BeanDeserializerFactory.java:228)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.createBeanDeserializer(BeanDeserializerFactory.java:143)
    at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer2(DeserializerCache.java:406)
    at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer(DeserializerCache.java:352)
    at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:264)
    ... 42 more

See https://groups.google.com/forum/#!topic/dropwizard-user/xgBAhXaqop0

[cowtowncoder]

Thank you for reporting this. Strange that it hasn't been hit before... seems like it would be occurring not infrequently.

And I assume this is with Jackson 2.7(.5)?

[adrianriley]

It was 2.7.6 and 2.8.3, but I see you have covered both. Thanks

[robinst]

Just hit this bug with spring-boot 1.4.0 (which has jackson 2.8.1). We're not using jaxb annotations, but org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration automatically adds the annotation inspector if it's on the classpath.

Bumping to spring-boot 1.4.2 and jackson 2.8.4 fixes the problem.

[tvaughan77]

FWIW, I had the same issue in Dropwizard (trying to upgrade from a 0.9.1 -> 1.0.5). While Dropwizard manages the jackson ecosystem to the 2.7.6 version, I found that forcing jackson up to 2.8.5 both solved this problem and kept everything else "holding together" pretty well too.