android - Handling Null Pointers from JsonReader -

i using jsonreader fetch lots of data website , saving db. incidentally, whenever reader doesnt find value object item, fails , stops executing.

this error have;

system.err﹕ java.lang.illegalstateexception: expected string null @ line 1 column 359337 path $[19].date 

even if specified value not available, seems objects loaded before error encountered lost , not saved db. there way handle these errors , keep objects had been loaded far? have set jsonreader lenient.

this part of method parses data:

private post read(jsonreader reader) throws exception {             reader.beginobject();              while (reader.hasnext()) {                 string name = reader.nextname();                  switch (name) {                     case title:                         mtitle = new stringbuilder();                         mtitle.append(reader.nextstring());                         break;                     case author:                         if (reader.hasnext()) {                             jsontoken peek = reader.peek();                              if (peek == jsontoken.null) {                                 reader.skipvalue();                             } else {                                 reader.beginobject();                                  while (reader.hasnext()) {                                     string enclosedname = reader.nextname();                                      switch (enclosedname) {                                         case name:                                             mauthor = new stringbuilder();                                             mauthor.append(reader.nextstring());                                             break;                                         case avatar:                                             mavatar = new stringbuilder();                                             mavatar.append(reader.nextstring());                                             break;                                         default:                                             reader.skipvalue();                                             break;                                     }                                 }                                  reader.endobject();                             }                         }                         break;                     case content:                         mdescription = new stringbuilder();                         mdescription.append(reader.nextstring());                         break;                     case url:                         mentrylink = new stringbuilder();                         mentrylink.append(reader.nextstring());                         break;                     case date:                         mdatestringbuilder = new stringbuilder();                         mdatestringbuilder.append(reader.nextstring());                         break;                     case guid:                         mguid = new stringbuilder();                         mguid.append(reader.nextstring());                         break;                     case featured_image:                         if (reader.hasnext()) {                             jsontoken = reader.peek();                              if (look == jsontoken.null) {                                 reader.skipvalue();                             } else {                                 mfeaturedimage = new stringbuilder();                                 reader.beginobject();                                  while (reader.hasnext()) {                                     string itemtolookfor = reader.nextname();                                      switch (itemtolookfor) {                                         case source:                                             mfeaturedimage.append(reader.nextstring());                                             break;                                         default:                                             reader.skipvalue();                                             break;                                     }                                 }                                  reader.endobject();                             }                         }                         break;                     case terms:                         if (reader.hasnext()) {                             jsontoken check = reader.peek();                              if (check == jsontoken.null) {                                 reader.skipvalue();                             } else {                                 reader.beginobject();                                  while (reader.hasnext()) {                                     string stuff = reader.nextname();                                      switch (stuff) {                                         case categories:                                             reader.beginarray();                                              itemcategory = new stringbuilder();                                              while (reader.hasnext()) {                                                 reader.beginobject();                                                  while (reader.hasnext()) {                                                     string item = reader.nextname();                                                      switch (item) {                                                         case name:                                                             itemcategory.append(reader.nextstring()).append(",");                                                             break;                                                         default:                                                             reader.skipvalue();                                                             break;                                                     }                                                 }                                                  reader.endobject();                                             }                                             reader.endarray();                                             break;                                         case tags:                                             reader.beginarray();                                              itemtags = new stringbuilder();                                              while (reader.hasnext()) {                                                 reader.beginobject();                                                  while (reader.hasnext()) {                                                     string item = reader.nextname();                                                      switch (item) {                                                         case name:                                                             itemtags.append(reader.nextstring()).append(",");                                                             break;                                                         default:                                                             reader.skipvalue();                                                             break;                                                     }                                                 }                                                  reader.endobject();                                             }                                             reader.endarray();                                             break;                                         default:                                             reader.skipvalue();                                             break;                                     }                                 }                                  reader.endobject();                             }                         }                         break;                     default:                         reader.skipvalue();                         break;                 }             }              reader.endobject();              return new post(mauthor.tostring(), mavatar.tostring(), mdatestringbuilder.tostring(), mtitle.tostring(), mentrylink.tostring(), mdescription.tostring(), mguid.tostring(), mfeaturedimage.tostring(), itemtags.tostring(), itemcategory.tostring());         } 

i thought may weren't checking null elements, seems case.

at 1 point use:

jsontoken check = reader.peek();  if (check == jsontoken.null) { 

that correct. however, in other places string:

mdescription.append(reader.nextstring()); 

in places getting string, need check whether there unexpected type (such null). in cases this, need apply appropriate error containment code.

incidentally, don't need creating of stringbuilders. since putting 1 string after each initialization. save lot of time using string. if intend write contents stringbuilder each type, need initialize them before start looping.