JAVA parser for asana json data "Error:JSONObject cannot be converted to JSONArray" -

i working on java parser parse asana json data. executing request using curl , curl use cygwin tool(used execute unix commands on windows).

now getting single project details in json format(that contain tasks in projects) getting 1 task id , use task id single task details. when parse subrequest data(request single task detail). gives me error "jsonobject cannot converted jsonarray".

error line

jsonarray dataarray2= (jsonarray)jsonobject2.get("data");

example asana json response many tasks

{   "data": [     {       "id": 23097910271884,       "name": "asana prtl rprtng intgrtn r&d"     },     {       "id": 30483134480109,       "name": "curl training"     },     {       "id": 30483134480115,       "name": "database design"     },     {       "id": 31806291283828,       "name": "json parser setup"         },     {       "id": 31806291283832,       "name": "jdb connectivity , setup"     },     {       "id": 30483134480118,       "name": "java utility development"     },     {       "id": 31806291283837,       "name": "data synchronization testing"     },     {       "id": 31806291283841,       "name": "bug fixes"     },     {       "id": 30483134480171,       "name": "portal test report development (1)"     }   ] } 

example asana single task detail

{   "data": {     "id": 23097910271884,     "created_at": "2014-12-30t06:35:11.959z",     "modified_at": "2015-05-12t07:19:02.589z",     "name": "asana prtl rprtng intgrtn r&d",     "notes": "",     "completed": true,     "assignee_status": "inbox",     "completed_at": "2015-05-12t07:20:29.181z",     "due_on": "2015-04-01",     "due_at": null,     "workspace": {       "id": 14810798216415,       "name": "crescentbahuman.com"     },     "num_hearts":2,     "parent": null,     "tags": [     {         "id": 17129100409445,         "name": "it"       }     ],     "projects": [       {         "id": 30483134480107,         "name": "asana integrations"       }     ],     "hearted": true,     "memberships": [       {         "project": {           "id": 30483134480107,           "name": "asana integrations"         },         "section": null       }     ],     "assignee": {       "id": 22273357407644,       "name": "abdul majid bajwa"     },     "hearts": [       {         "id": 33739876272211,         "user": {           "id": 22273357407644,           "name": "abdul majid bajwa"         }       },       {         "id": 33740502736864,         "user": {           "id": 14810783571926,           "name": "asana admin"         }       }     ],     "followers": [       {         "id": 14810783571926,         "name": "asana admin"       },       {         "id": 22273357407644,         "name": "abdul majid bajwa"       }     ]   } } 

example java code

package alljsonclasses;   import java.io.*; import java.lang.*; import org.json.simple.jsonarray; import org.json.simple.jsonobject; import org.json.simple.parser.jsonparser;  public class asanadata {  public static void main (string args[]){ file workdir = new file("c:/cygwin64/bin"); try { runtime systemshell = runtime.getruntime(); string urlrequest="curl -u 6k8mjnvi.o6s1dqbgt1aiesl4kqsqb0g:   https://app.asana.com/api/1.0/projects/30483134480107/tasks?opt_pretty";  string cmd = urlrequest; cmd += " | grep 'object'";  process shelloutput = systemshell.exec(workdir+"/"+cmd, null, workdir); inputstreamreader isr = new inputstreamreader(shelloutput.getinputstream());     bufferedreader br = new bufferedreader (isr);           jsonparser jsonparser = new jsonparser();         jsonobject jsonobject = (jsonobject) jsonparser.parse(br);           jsonarray dataarray= (jsonarray) jsonobject.get("data");         for(int i=0;i<dataarray.size();i++){                  jsonobject dataobject = (jsonobject) dataarray.get(i);            long task_id =  (long) dataobject.get("id");         system.out.println("project id is: " + task_id);          try {         file workdir2 = new file("c:/cygwin64/bin");         runtime systemshell2 = runtime.getruntime();         string curlrequest2="curl -u 6k8mjnvi.o6s1dqbgt1aiesl4kqsqb0g: https://app.asana.com/api/1.0/tasks/"+task_id+"?opt_pretty";         system.out.println();           string cmd2 = curlrequest2;         cmd2 += " | grep 'object'";          process shelloutput2 = systemshell2.exec(workdir2+"/"+cmd2, null, workdir2);         inputstreamreader isr2 = new inputstreamreader(shelloutput2.getinputstream());           bufferedreader br2 = new bufferedreader (isr2);         jsonparser jsonparser2 = new jsonparser();         jsonobject jsonobject2 = (jsonobject) jsonparser2.parse(br2);            jsonarray dataarray2= (jsonarray)jsonobject2.get("data");         for(int i2=0;i<dataarray2.size();i2++){                  jsonobject dataobject2 = (jsonobject) dataarray2.get(i2);            long task_id2 =  (long) dataobject2.get("id");         system.out.println("task id is: " + task_id2);          string task_created_at_dt2 = (string) dataobject2.get("created_at");         system.out.println("the task created @ is: " + task_created_at_dt2);          string task_modified_at_dt2 = (string) dataobject2.get("modified_at");         system.out.println("the task modified @ is: " + task_modified_at_dt2);           string task_name = (string) dataobject2.get("name");         system.out.println("task name is: " + task_name);          string task_notes = (string) dataobject2.get("notes");         system.out.println("task notes are: " + task_notes);          boolean task_completed_status = (boolean) dataobject2.get("completed");         system.out.println("task completed status: " + task_completed_status);          string task_assignee_status = (string) dataobject2.get("assignee_status");         system.out.println("task assignee status: " + task_assignee_status);          string completed_at = (string) dataobject2.get("completed_at");         system.out.println("task completed at: " + completed_at);          string task_due_on = (string) dataobject2.get("due_on");         system.out.println("task due date: " + task_due_on);          string due_at = (string) dataobject2.get("due_at");         system.out.println("task due at: " + due_at);          jsonobject workspaceobj = (jsonobject) dataobject2.get("workspace");         long workspace_id = (long) workspaceobj.get("id");         string workspace_name = (string) workspaceobj.get("name");         system.out.println("workspace id " + workspace_id + " workspace  name " + workspace_name);          long task_number_of_hearts = (long) dataobject2.get("num_hearts");         system.out.println("task number of hearts: " + task_number_of_hearts);          string task_parent = (string) dataobject2.get("parent");         system.out.println("task parent: " + task_parent);          jsonarray task_hearts= (jsonarray) dataobject2.get("hearts");         (int z = 0; z < task_hearts.size(); z++) {         jsonobject task_hearts_object = (jsonobject) task_hearts.get(z);         long task_hearts_id = (long) task_hearts_object.get("id");         string task_hearts_name = (string) task_hearts_object.get("name");         system.out.println("task hearts id " + task_hearts_id + " task hearts name " + task_hearts_name);         }          jsonarray task_tags= (jsonarray) dataobject2.get("tags");             (int z = 0; z < task_tags.size(); z++) {                 jsonobject task_tags_object = (jsonobject) task_tags.get(z);                 long task_tags_id = (long) task_tags_object.get("id");                 string task_tags_name = (string) task_tags_object.get("name");                 system.out.println("task tags id " + task_tags_id + " task tags name " + task_tags_name);             }          boolean task_hearted = (boolean) dataobject2.get("hearted");         system.out.println("task hearted: " + task_hearted);          jsonarray task_projects= (jsonarray) dataobject2.get("projects");         (int z = 0; z < task_projects.size(); z++) {         jsonobject task_projects_object = (jsonobject) task_projects.get(z);         long task_projects_id = (long) task_projects_object.get("id");         string task_projects_name = (string) task_projects_object.get("name");         system.out.println("task projects id " + task_projects_id + " task projects name " + task_projects_name);         }          jsonarray task_memberships= (jsonarray) dataobject2.get("memberships");         (int z = 0; z < task_memberships.size(); z++) {         jsonobject task_memberships_object = (jsonobject) task_memberships.get(z);         jsonobject task_memberships_section_object = (jsonobject) task_memberships_object.get("section");         if(task_memberships_section_object!=null){         long task_memberships_section_id = (long) task_memberships_section_object.get("id");         string task_memberships_section_name = (string) task_memberships_section_object.get("name");         system.out.println("task memberships section id " + task_memberships_section_id + " task memberships section name " + task_memberships_section_name);         }          jsonobject task_memberships_project = (jsonobject) task_memberships_object.get("project");         long task_memberships_project_id = (long) task_memberships_project.get("id");         string task_memberships_project_name = (string) task_memberships_project.get("name");         system.out.println("task memberships project id " + task_memberships_project_id + " task memberships project name " + task_memberships_project_name);         }          jsonobject task_assignee_object = (jsonobject) dataobject2.get("assignee");         if(task_assignee_object!=null){         long task_assignee_id = (long) task_assignee_object.get("id");         string task_assignee_name = (string) task_assignee_object.get("name");         system.out.println("assignee id " + task_assignee_id + " assignee name " + task_assignee_name);         }          jsonarray task_followers= (jsonarray) dataobject2.get("followers");         (int z = 0; z < task_followers.size(); z++) {         jsonobject task_followers_object = (jsonobject) task_followers.get(z);         long task_followers_id = (long) task_followers_object.get("id");         string task_followers_name = (string) task_followers_object.get("name");         system.out.println("followers id " + task_followers_id + " followers name " + task_followers_name);         }           jsonarray task_subtasks= (jsonarray) dataobject2.get("subtasks");         for(int j=0;j<task_subtasks.size();j++){          jsonobject sub_data_object = (jsonobject) task_subtasks.get(j);         //jsonobject innerobj = (jsonobject) m.get("project");           long sub_task_id =  (long) sub_data_object.get("id");         system.out.println("subtasks id is: " + sub_task_id);                    string sub_task_name = (string) sub_data_object.get("name");         system.out.println("subtasks task name is: " + sub_task_name);             string sub_task_notes = (string) sub_data_object.get("notes");         system.out.println("subtasks notes are: " + sub_task_notes);           boolean sub_task_completed_status = (boolean) sub_data_object.get("completed");         system.out.println("subtasks completed status: " + sub_task_completed_status);          string sub_task_assignee_status = (string) sub_data_object.get("assignee_status");         system.out.println("subtasks assignee status: " + sub_task_assignee_status);          string sub_completed_at = (string) sub_data_object.get("completed_at");         system.out.println("subtasks completed at: " + sub_completed_at);          string sub_task_due_on = (string) sub_data_object.get("due_on");         system.out.println("subtasks due on: " + sub_task_due_on);          string sub_due_at = (string) sub_data_object.get("due_at");         system.out.println("subtasks due at: " + sub_due_at);          jsonobject sub_workspace_object = (jsonobject) sub_data_object.get("workspace");         long sub_workspace_id = (long) sub_workspace_object.get("id");         string sub_workspace_name = (string) sub_workspace_object.get("name");         system.out.println("subtasks workspace id " + sub_workspace_id + " subtasks workspace name " + sub_workspace_name);           long sub_task_number_of_hearts = (long) sub_data_object.get("num_hearts");         system.out.println("subtasks number of hearts: " + sub_task_number_of_hearts);           jsonobject sub_parent_object = (jsonobject) sub_data_object.get("parent");         long sub_parent_id = (long) sub_parent_object.get("id");         string sub_parent_name = (string) sub_parent_object.get("name");         system.out.println("subtasks parent id " + sub_parent_id + " subtasks parent name " + sub_parent_name);            jsonarray sub_hearts= (jsonarray) sub_data_object.get("hearts");         (int z = 0; z < sub_hearts.size(); z++) {         jsonobject sub_hearts_object = (jsonobject) sub_hearts.get(z);         long sub_hearts_id = (long) sub_hearts_object.get("id");         string sub_hearts_name = (string) sub_hearts_object.get("name");         system.out.println("subtasks hearts id " + sub_hearts_id + "with subtasks  hearts name " + sub_hearts_name);         }          jsonarray sub_tags= (jsonarray) sub_data_object.get("tags");         (int z = 0; z < sub_tags.size(); z++) {         jsonobject sub_tags_object = (jsonobject) sub_tags.get(z);         long sub_tags_id = (long) sub_tags_object.get("id");         string sub_tags_name = (string) sub_tags_object.get("name");         system.out.println("subtasks tags id " + sub_tags_id + " subtasks tags name " + sub_tags_name);         }          boolean sub_task_hearted = (boolean) sub_data_object.get("hearted");         system.out.println("subtasks hearted: " + sub_task_hearted);          jsonarray sub_projects= (jsonarray) sub_data_object.get("projects");         (int z = 0; z < sub_projects.size(); z++) {         jsonobject sub_projects_object = (jsonobject) sub_projects.get(z);         long sub_projects_id = (long) sub_projects_object.get("id");         string sub_projects_name = (string) sub_projects_object.get("name");         system.out.println("subtasks projects id " + sub_projects_id + " subtasks projects name " + sub_projects_name);         }          jsonarray sub_memberships= (jsonarray) sub_data_object.get("memberships");         if(sub_memberships!=null){          (int z = 0; z < sub_memberships.size(); z++) {         jsonobject sub_memberships_object = (jsonobject) sub_memberships.get(z);          jsonobject sub_memberships_section_object = (jsonobject) sub_memberships_object.get("section");         long sub_memberships_section_id = (long) sub_memberships_section_object.get("id");         string sub_memberships_section_name = (string) sub_memberships_section_object.get("name");         system.out.println("subtasks memberships section id " + sub_memberships_section_id + " subtasks memberships section name " + sub_memberships_section_name);          jsonobject sub_memberships_project_object = (jsonobject) sub_memberships_object.get("project");         long sub_memberships_project_id = (long) sub_memberships_project_object.get("id");         string sub_memberships_project_name = (string) sub_memberships_project_object.get("name");         system.out.println("subtasks memberships project id " + sub_memberships_project_id + " subtasks memberships project name " + sub_memberships_project_name);         }         }           jsonobject sub_assignee_object = (jsonobject) sub_data_object.get("assignee");          if(sub_assignee_object!=null){         long sub_assignee_id = (long) sub_assignee_object.get("id");         string sub_assignee_name = (string) sub_assignee_object.get("name");         system.out.println("subtasks assignee id " + sub_assignee_id + " subtasks assignee name " + sub_assignee_name);          }          jsonarray sub_followers= (jsonarray) sub_data_object.get("followers");         (int z = 0; z < sub_followers.size(); z++) {         jsonobject sub_followers_object = (jsonobject) sub_followers.get(z);         long sub_followers_id = (long) sub_followers_object.get("id");         string sub_followers_name = (string) sub_followers_object.get("name");         system.out.println("subtasks followers id " + sub_followers_id + " subtasks followers name " + sub_followers_name);          }}}         }catch (ioexception ioe){ system.err.println(ioe); }catch (throwable t) { t.printstacktrace(); }              string task_name = (string) dataobject.get("name");         system.out.println("project name is: " + task_name);          }   int exitval = shelloutput.waitfor(); system.out.println("process exit value : "+exitval); }catch (ioexception ioe){ system.err.println(ioe); }catch (throwable t) { t.printstacktrace(); } } } 

according docs have use getjsonarray() method instead of simple get():

jsonarray dataarray2 = jsonobject2.getjsonarray("data"); 

i hope fixes error.