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https://issues.apache.org/jira/browse/SOLR-16101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17509035#comment-17509035
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ASF subversion and git services commented on SOLR-16101:
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Commit 4918187cc0aa3299ba6a8addefb388b010ce2603 in solr's branch
refs/heads/branch_9_0 from Anshum Gupta
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=4918187 ]
SOLR-16101: Add empty constructor for SolrInputDocument (#746) (#751) (#752)
> 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
> Fix For: 9.0
>
> Time Spent: 1h
> 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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