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https://issues.apache.org/jira/browse/SOLR-16101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17507166#comment-17507166
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Mike Drob commented on SOLR-16101:
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If we're going to add this now, after having declined to do so in the linked
issues, we should at least document clearly in the no-arg constructor why it
exists so that it would not get removed again in the future by somebody doing
"clean up" work.
For what it's worth, GSON lets you register an [instance
creator|https://github.com/google/gson/blob/master/UserGuide.md#TOC-Writing-an-Instance-Creator]
that I think would handle this particular case for you as a workaround (or
anybody reading this in the future who needs it to work on an older version
that is missing the constructor).
> Add an empty constructor for SolrInputDocument
> ----------------------------------------------
>
> Key: SOLR-16101
> URL: https://issues.apache.org/jira/browse/SOLR-16101
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrJ
> Affects Versions: 5.5, 6.6, 7.7, 8.11.1
> Reporter: Anshum Gupta
> Assignee: Anshum Gupta
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> While trying to serialize and deserialize {{SolrInputDocument}} using the
> following code,
> {code:java}
> final SolrInputDocument inputDoc = new SolrInputDocument();
> inputDoc.addField("foo", "bar");
> Gson gson = new Gson();
> String docString = gson.toJson(inputDoc);
> SolrInputDocument solrInputDocument = new
> SolrInputDocument(gson.fromJson(docString, SolrInputDocument.class));
> {code}
> the deserializing fails w/
> bq. "java.lang.ClassCastException: Cannot cast
> com.google.gson.internal.LinkedTreeMap to
> org.apache.solr.common.SolrInputDocument"
> {{SolrInputDocument}} needs an empty constructor for this.
> There seem to be some ways to get around this for older versions but with
> vanilla code this affects all versions starting 5.5 all the way until 8.11.1
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