On Thu, Mar 13, 2014 at 10:41 AM, Marius Dumitru Florea
<mariusdumitru.flo...@xwiki.com> wrote:
> Hi guys,
>
> The following code
>
> server.queryAndStreamResponse(new SolrQuery("*:*"), new
> StreamingResponseCallback() {
> public void streamSolrDocument(SolrDocument doc) {
> }
> public void streamDocListInfo(long numFound, long start, Float maxScore) {
> }
> });
>
> throws
>
> Caused by: java.lang.ClassCastException: java.util.ArrayList cannot be
> cast to java.lang.String
> at
> org.apache.solr.common.util.JavaBinCodec.readOrderedMap(JavaBinCodec.java:124)
> at org.apache.solr.common.util.JavaBinCodec.readVal(JavaBinCodec.java:188)
> at
> org.apache.solr.common.util.JavaBinCodec.unmarshal(JavaBinCodec.java:116)
> at
> org.apache.solr.client.solrj.embedded.EmbeddedSolrServer.request(EmbeddedSolrServer.java:205)
> ... 10 more
>
> streamDocListInfo and streamSolrDocument are called as expected but
> the exception is thrown after all the results are streamed, when
> building the QueryResponse to return (which is not really needed).
>
> I debugged a bit and it fails while unmarshaling:
>
> {
> responseHeader = {
> status = 0,
> QTime = 1716,
> params = {
> q = *:*,
> fl = name,space,wiki,doclocale,
> fq = type:DOCUMENT,
> rows = 100,
> start = 0
> }
> },
> response = {
> numFound=571,
> start=0,
> maxScore = 1.0,
> docs=[]
> },
> --> here it throws an exception because it expects a String key, but
> it gets an array..
After more debugging I found that what the missing part here that
fails to be unmarshaled is
facet_counts = {
facet_queries = {},
facet_fields = {wiki={},space_exact={},locale={}, ...},
facet_dates = {},
facet_ranges = {}
},
highlighting = {foo={},bar={}}
So this part gets broken in the marshaling / unmarshaling process when
streaming the query results. I disabled the faceting and highlighting
and no more exception.
Note that first I tried to disable the faceting and highlighting by calling:
query.setFacet(false);
query.setHighlight(false);
which didn't work because these calls only remove the faceting and
highlighting parameters from the query and I had the faceting and
highlighting enabled by default in the Solr configuration. I find this
methods confusing. In the end I used:
query.set("facet", false);
query.set("hl", false);
which did the trick.
Thankfully I don't need faceting nor highlighting in my case but this
ClassCastException thrown when streaming the query results surely
looks like a bug. Can you reproduce?
Thanks,
Marius
> }
>
> Note that on my project I have two branches
>
> * one using Solr 4.0.0 and Java 1.6
> * one using Solr 4.7.0 and Java 1.7
>
> Both produce the same exception. Do you know what could be wrong?
>
> Thanks,
> Marius
