I am trying to invoke the CSVResponseWriter to create a CSV file of all
stored fields. There are millions of documents so I need to write to the
file iteratively. I saw a snippet of code online that claimed it could
effectively remove the SorDocumentList wrapper and allow the docs to be
retrieved in the actual format requested in the query. However, I get a null
pointer from the CSVResponseWriter.write() method.
SolrQuery qry = new SolrQuery("*:*");
qry.setParam("wt", "csv");
// set other params
SolrServer server = getSolrServer();
try {
QueryResponse res = server.query(qry);
CSVResponseWriter writer = new CSVResponseWriter();
Writer w = new StringWriter();
SolrQueryResponse solrResponse = new SolrQueryResponse();
solrResponse.setAllValues(res.getResponse());
try {
SolrParams list = new MapSolrParams(new HashMap<String,
String>());
writer.write(w, new LocalSolrQueryRequest(null, list),
solrResponse);
} catch (IOException e) {
throw new RuntimeException(e);
}
System.out.print(w.toString());
} catch (SolrServerException e) {
e.printStackTrace();
}
NPE snippet:
org.apache.solr.response.CSVWriter.writeResponse(CSVResponseWriter.java:281)
org.apache.solr.response.CSVResponseWriter.write(CSVResponseWriter.java:56)
Am I on the right track with the approach? I really don't want to roll my
own document to CSV line convertor. Thanks!
Solr 4.9
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