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https://issues.apache.org/jira/browse/TINKERPOP-2291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

stephen mallette closed TINKERPOP-2291.
---------------------------------------
    Fix Version/s: 3.4.4
                   3.3.9
                   3.5.0
       Resolution: Fixed

> TraversalExplanation deserialization in GraphSON
> ------------------------------------------------
>
>                 Key: TINKERPOP-2291
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-2291
>             Project: TinkerPop
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 3.3.8
>            Reporter: stephen mallette
>            Assignee: stephen mallette
>            Priority: Major
>             Fix For: 3.5.0, 3.3.9, 3.4.4
>
>
> We currently coerce {{TraversalExplanation}} to {{Map}} which works well for 
> GLVs but doesn't work so well for Java itself where GraphSON deserialization 
> requires a symmetrical derser operation. 
> Leads to errors like:
> {code}
> org.apache.tinkerpop.shaded.jackson.databind.JsonMappingException: Could not 
> deserialize the JSON value as required. Nested exception: 
> org.apache.tinkerpop.shaded.jackson.databind.JsonMappingException: Could not 
> deserialize the JSON value as required. Nested exception: 
> org.apache.tinkerpop.shaded.jackson.databind.exc.UnrecognizedPropertyException:
>  Unrecognized field "@type" (class 
> org.apache.tinkerpop.gremlin.process.traversal.util.TraversalExplanation), 
> not marked as ignorable (one known property: "strategyTraversals"])
>  at [Source: 
> (byte[])"{"requestId":"0bcc54dc-87a0-408b-abe0-35678333827e","status":{"message":"","code":200,"attributes":{"@type":"g:Map","@value":["host","/127.0.0.1:50299"]}},"result":{"data":{"@type":"g:List","@value":[{"@type":"g:TraversalExplanation","@value":{"@type":"g:Map","@value":["original",{"@type":"g:List","@value":["GraphStep(vertex,[])"]},"intermediate",{"@type":"g:List","@value":[{"@type":"g:Map","@value":["traversal",{"@type":"g:List","@value":["GraphStep(vertex,[])"]},"strategy","ConnectiveStrategy""[truncated
>  2707 bytes]; line: 1, column: 254] (through reference chain: 
> org.apache.tinkerpop.gremlin.process.traversal.util.TraversalExplanation["@type"])
>  at [Source: 
> (byte[])"{"requestId":"0bcc54dc-87a0-408b-abe0-35678333827e","status":{"message":"","code":200,"attributes":{"@type":"g:Map","@value":["host","/127.0.0.1:50299"]}},"result":{"data":{"@type":"g:List","@value":[{"@type":"g:TraversalExplanation","@value":{"@type":"g:Map","@value":["original",{"@type":"g:List","@value":["GraphStep(vertex,[])"]},"intermediate",{"@type":"g:List","@value":[{"@type":"g:Map","@value":["traversal",{"@type":"g:List","@value":["GraphStep(vertex,[])"]},"strategy","ConnectiveStrategy""[truncated
>  2707 bytes]; line: 1, column: 253]
>  at [Source: 
> (byte[])"{"requestId":"0bcc54dc-87a0-408b-abe0-35678333827e","status":{"message":"","code":200,"attributes":{"@type":"g:Map","@value":["host","/127.0.0.1:50299"]}},"result":{"data":{"@type":"g:List","@value":[{"@type":"g:TraversalExplanation","@value":{"@type":"g:Map","@value":["original",{"@type":"g:List","@value":["GraphStep(vertex,[])"]},"intermediate",{"@type":"g:List","@value":[{"@type":"g:Map","@value":["traversal",{"@type":"g:List","@value":["GraphStep(vertex,[])"]},"strategy","ConnectiveStrategy""[truncated
>  2707 bytes]; line: 1, column: 253] (through reference chain: 
> java.util.LinkedHashMap["result"]->java.util.LinkedHashMap["data"])
> {code}



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