snowstorm tech [https://community.jboss.org/people/snowstormuser] created the discussion
"Re: Starting process instance using the jBPM REST API and setting parameters"
To view the discussion, visit: https://community.jboss.org/message/799005#799005
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Hi https://community.jboss.org/people/jmiguel77 Jose Miguel Loor,
Use the following programme may be help you,
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.*;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.ContentBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
*/
public class StartProcessWV {
    private static final String authentication_url = " http://localhost:8080/gwt-console-server/rs/identity/secure/j_security_check http://localhost:8080/gwt-console-server/rs/identity/secure/j_security_check";
//private static final String process_start_url = " http://localhost:8080/gwt-console-server/rs/process/definition/defaultPackage.ProcessWV/new_instance http://localhost:8080/gwt-console-server/rs/process/definition/defaultPackage.ProcessWV/new_instance";
private static final String process_start_url = " http://localhost:8080/gwt-console-server/rs/form/process/defaultPackage.ProcessWV/complete http://localhost:8080/gwt-console-server/rs/form/process/defaultPackage.ProcessWV/complete";
private static final String render_form_url = " http://localhost:8080/gwt-console-server/rs/form/process/defaultPackage.ProcessWV/render http://localhost:8080/gwt-console-server/rs/form/process/defaultPackage.ProcessWV/render";
    public static String KEY_USERNAME = "j_username";
public static String KEY_PASSWORD = "j_password";
private DefaultHttpClient httpClient = new DefaultHttpClient(); // keep this out of the method in order to reuse the object for calling other services without losing session
public String authenticate(String address, String username, String password) {
       String responseString = "";
     // new NameValuePair("j_username", username)
       List<NameValuePair> formparams = new ArrayList<NameValuePair>();
       formparams.add(new BasicNameValuePair(KEY_USERNAME, username));
       formparams.add(new BasicNameValuePair(KEY_PASSWORD, password));
HttpPost httpPost = new HttpPost( address );
      // HttpPost httpPost = new HttpPost(" http:// http://" + address + "/gwt-console-server/rs/process/j_security_check");
       InputStreamReader inputStreamReader = null;
       BufferedReader bufferedReader = null;
       try {
           UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams, "UTF-8");
           //UrlEncodedFormEntity entity=new UrlEncodedFormEntity(formparams, "multipart/form-data");
           httpPost.setEntity(entity);
           HttpResponse response = httpClient.execute(httpPost);
           InputStream inputStream = response.getEntity().getContent();
           inputStreamReader = new InputStreamReader(inputStream);
           bufferedReader = new BufferedReader(inputStreamReader);
           StringBuilder stringBuilder = new StringBuilder();
           String line = bufferedReader.readLine();
        //  System.out.println("line==>"+line);
           while (line != null) {
               stringBuilder.append(line);
               line = bufferedReader.readLine();
           }
           responseString = stringBuilder.toString();
       } catch (Exception e) {
           //throw new RuntimeException(e);
           System.out.println("e = " + e);
       } finally {
           if (inputStreamReader != null) {
               try {
                   inputStreamReader.close();
               } catch (Exception e) {
                   throw new RuntimeException(e);
               }
           }
           if (bufferedReader != null) {
               try {
                   bufferedReader.close();
               } catch (Exception e) {
                   throw new RuntimeException(e);
               }
           }
       }
       return responseString;
   }
public String requestPostService(String url, Map<String, Object> parameters, boolean multipart) {
       String responseString = "";
       MultipartEntity multiPartEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
       List<BasicNameValuePair> formparams = new ArrayList<BasicNameValuePair>();
       if (parameters == null) {
           parameters = new HashMap<String, Object>();
       }
       Set<String> keys = parameters.keySet();
       for (Iterator<String> keysIterator = keys.iterator(); keysIterator.hasNext();) {
           String keyString = keysIterator.next();
           String value = parameters.get(keyString).toString();
           formparams.add(new BasicNameValuePair(keyString, value));
           if (multipart) {
               try {
                   StringBody stringBody = new StringBody(value, Charset.forName("UTF-8"));
                   //System.out.println(stringBody.);
                   multiPartEntity.addPart(keyString, (ContentBody) stringBody);
               } catch (Exception e) {
                   throw new RuntimeException(e);
               }
           }
       }
       HttpPost httpPost = new HttpPost(url);
       InputStreamReader inputStreamReader = null;
       BufferedReader bufferedReader = null;
       try {
           if (multipart) {
               httpPost.setEntity(multiPartEntity);
           } else {
               UrlEncodedFormEntity entity =new UrlEncodedFormEntity(formparams, "UTF-8");// new UrlEncodedFormEntity(formparams, "multipart/form-data");
               ////
               httpPost.setEntity(entity);
           }
           HttpResponse response = httpClient.execute(httpPost);
           InputStream inputStream = response.getEntity().getContent();
           inputStreamReader = new InputStreamReader(inputStream);
           bufferedReader = new BufferedReader(inputStreamReader);
           StringBuilder stringBuilder = new StringBuilder();
           String line = bufferedReader.readLine();
           while (line != null) {
               stringBuilder.append(line);
               line = bufferedReader.readLine();
           }
           responseString = stringBuilder.toString();
       } catch (Exception e) {
           throw new RuntimeException(e);
       } finally {
           if (inputStreamReader != null) {
               try {
                   inputStreamReader.close();
               } catch (Exception e) {
                   throw new RuntimeException(e);
               }
           }
           if (bufferedReader != null) {
               try {
                   bufferedReader.close();
               } catch (Exception e) {
                   throw new RuntimeException(e);
               }
           }
       }
       return responseString;
}
public String requestGetService(String url, Map<String, Object> parameters, boolean multipart) {
       String responseString = "";
       HttpGet httpGet = new HttpGet(url);
       InputStreamReader inputStreamReader = null;
       BufferedReader bufferedReader = null;
       try {
           HttpResponse response = httpClient.execute(httpGet);
           InputStream inputStream = response.getEntity().getContent();
           inputStreamReader = new InputStreamReader(inputStream);
           bufferedReader = new BufferedReader(inputStreamReader);
           StringBuilder stringBuilder = new StringBuilder();
           String line = bufferedReader.readLine();
          // System.out.println("line = " + line);
           while (line != null) {
               stringBuilder.append(line);
               line = bufferedReader.readLine();
           }
           responseString = stringBuilder.toString();
       } catch (Exception e) {
           throw new RuntimeException(e);
       } finally {
           if (inputStreamReader != null) {
               try {
                   inputStreamReader.close();
               } catch (Exception e) {
                   throw new RuntimeException(e);
               }
           }
           if (bufferedReader != null) {
               try {
                   bufferedReader.close();
               } catch (Exception e) {
                   throw new RuntimeException(e);
               }
           }
       }
       return responseString;
}
public static void main(String args[])
{
   StartProcessWV startProcessWV=new StartProcessWV();
    Map map=new HashMap();
   map.put("name", "Shahid Iqbal");
 // map.put("age", "29");
   System.out.println("Login Form==> "+startProcessWV.requestGetService(render_form_url, null, true));
  System.out.println(startProcessWV.authenticate(authentication_url, "admin", "admin")+"\n");
 System.out.println("Render Form==> "+startProcessWV.requestGetService(render_form_url, null, true)+"\n");
  System.out.println("Process start Output==> "+startProcessWV.requestPostService(process_start_url, map, true));
}
}
please change the process id and your process should have the process form.
I hope so it will helpfull for you.
Sorry for my english
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