Cannot construct instance of `PEPSchema.MEMBER` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('Yes1')

[mbradshawUtah]

JacksonXmlUtil.txt APPLICATION_FULL_TYPE.txt SECTION_B_TYPE.txt MEMBER.txt

Looks similar to this issue, but I am still having this issue even though I am using 2.17.1 https://github.com/FasterXML/jackson-dataformat-xml/issues/646

I am expecting Yes1 for all 3 tests.

ERROR:

About to start 1st test.
1st Test result is: Yes1

About to start 2nd test.
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `pepschema.MEMBER` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('Yes1')
 at [Source: (StringReader); line: 1, column: 60] (through reference chain: pepschema.SECTION_B_TYPE["HOUSEHOLD_MEMBER"]->java.util.ArrayList[0])
    at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63)
    at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1754)
    at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1379)
    at com.fasterxml.jackson.databind.deser.std.StdDeserializer._deserializeFromString(StdDeserializer.java:311)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromString(BeanDeserializerBase.java:1588)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:197)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:187)
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer._deserializeFromArray(CollectionDeserializer.java:361)
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:246)
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:30)
    at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:138)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:310)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:177)
    at com.fasterxml.jackson.dataformat.xml.deser.XmlDeserializationContext.readRootValue(XmlDeserializationContext.java:104)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4905)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3848)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3816)
    at util.JacksonXmlUtil2.xmlStringToObject(JacksonXmlUtil.java:117)
    at util.JacksonXmlUtil2.main(JacksonXmlUtil.java:83)

About to start 3rd test.
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `pepschema.MEMBER` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('Yes1')
 at [Source: (StringReader); line: 1, column: 98] (through reference chain: pepschema.APPLICATION_FULL_TYPE["SECTION_B"]->pepschema.SECTION_B_TYPE["HOUSEHOLD_MEMBER"]->java.util.ArrayList[0])
    at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63)
    at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1754)
    at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1379)
    at com.fasterxml.jackson.databind.deser.std.StdDeserializer._deserializeFromString(StdDeserializer.java:311)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromString(BeanDeserializerBase.java:1588)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:197)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:187)
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer._deserializeFromArray(CollectionDeserializer.java:361)
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:246)
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:30)
    at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:138)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:310)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:177)
    at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:129)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:310)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:177)
    at com.fasterxml.jackson.dataformat.xml.deser.XmlDeserializationContext.readRootValue(XmlDeserializationContext.java:104)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4905)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3848)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3816)
    at util.JacksonXmlUtil2.xmlStringToObject(JacksonXmlUtil.java:117)
    at util.JacksonXmlUtil2.main(JacksonXmlUtil.java:96)

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.17.1</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.17.1</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.datatype/jackson-datatype-jdk8 -->
<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jdk8</artifactId>
    <version>2.17.1</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.dataformat/jackson-dataformat-xml -->
<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-xml</artifactId>
    <version>2.17.1</version>
</dependency>

CODE:

[mbradshawUtah]

If I just do MEMBER.class and have 1 household member then It deserializes fine. If I do the sectionB and the sectionb class I get the same error. Something with List causing an issue?

[cowtowncoder]

Added a label noting that we'd need an actual manageable test case -- definitions and output above is way too big to help with reproduction, unfortunately.

[mbradshawUtah]

Added a label noting that we'd need an actual manageable test case -- definitions and output above is way too big to help with reproduction, unfortunately.

I have attached 4 smaller files for the test. What is happening is that Reading HOUSEHOLD_MEMBER by itself works and loads correctly into the java object.

Doesn't matter if there is 1 household member in section b or multiple household members in section b both will result in the same error. Same thing happens when section b is in the Applicaiton tags the surrounding object application full type that also fails. I expect all 3 tests to return yes1.

[cowtowncoder]

Ok this is more useful (thank you!), but what is eventually needed is a unit test to reproduce the problem.

Still maybe someone has time to look into this and smaller files sound useful. I don't think I will have time to look into this on short term but others might.

[cowtowncoder]

Oh: forgot to mention that it may make sense to try this with 2.18.0-SNAPSHOT versions. Constructor detection has been rewritten in 2.18 branch and that might relevant, wrt exception message (if this is due to incorrect detection of Constructor to use).

[mbradshawUtah]

So apparently the issue is that HOUSEHOLD_MEMBER List doesn't use a wrapper so specifying that fixes this issue. Not sure why jaxb is generating the class like that.
@JacksonXmlElementWrapper(useWrapping=false)

[mbradshawUtah]

JacksonXmlModule xmlModule = new JacksonXmlModule(); xmlModule.setDefaultUseWrapper(false); XmlMapper xmlMapper = new XmlMapper(xmlModule);

This is resolved once I used this code above. Apparently since Jaxb uses lists we have to disable the defaultusewrapper.

[cowtowncoder]

JAXB defaults are indeed different: if no annotations/configuration is changed, JAXB defaults to "unwrapped" Lists. Jackson defaults to wrapped Lists and requires configuration or annotations to disable it.