spring integration - ClassCastException: com.fasterxml.jackson.databind.node.MissingNode cannot be cast to com.fasterxml.jackson.databind.node.Arraynode -

i have reader maps data instagram system. when performing junit test ran classcastexception. test class has following code:

public class instagramtojsonmappertest extends abstractmappertest {  private instagrammapper instagrammapper; private boolean printresult = true;  @before     public void setup() {         super.setup();         instagrammapper = new instagrammapper(128);     }      private void comparejson(string unmapped, string mapped) throws exception {         jsonnode unmappedjson = loadjson(unmapped);         jsonnode mappedjson = loadjson(mapped);         message<jsonnode> msg = messagebuilder.withpayload(unmappedjson).build();         message<jsonnode> resultmsg = instagrammapper.map(msg);         jsonnode result = resultmsg.getpayload();         if(printresult) {             system.out.println("processed: " + result);             system.out.println("expected: " + mappedjson.tostring());         }         assert.asserttrue(jacksonutils.equals(result, mappedjson));     }      @test     public void testphoto() throws exception {         comparejson("/mapping/test.json", "/mapping/test_mapped.json");     }  } 

the error because of line in mapper:

string[] branches = jacksonutils.toarray((arraynode) extractor.extract("contentbranch"));         if(branches.length == 1) {             abc.put("contentbranch", branches[0]);         } else {             abc.set("contentbranch", jacksonutils.arraytoarraynode(branches));         } 

my problem is, dont know change. should change mapper code or code in test file. error is:

classcastexception: com.fasterxml.jackson.databind.node.missingnode cannot      cast com.fasterxml.jackson.databind.node.arraynode 

you need use jsonnode node = extractor.extract("contentbranch"), test actual node type returned.

in case, getting missingnode can't cast arraynode.

if (node instanceof arraynode) {...} else {...}