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starting process through REST API

opal

Hi,

Does anybody know how to start the process through the REST API? I try do that in the following way:

@Test
public void testStartProcess() {
   try {
      DefaultHttpClient dhc = new DefaultHttpClient();
      HttpPost hp = new HttpPost("http://localhost:8080/activiti-explorer/process-instance");
      hp.setEntity(new StringEntity("{\"processDefinitionId\":\"helloworld:1\"}", "UTF-8"));
      HttpResponse hr = dhc.execute(hp);
      System.out.println(IOUtils.toString(hr.getEntity().getContent()));
   } catch (Exception e) {
      e.printStackTrace();
   }
}
‍‍‍‍‍‍‍‍‍‍‍‍‍‍

But the response I obtain is:

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
   org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:659)
   org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:563)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
   org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:195)
   org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:159)
   org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:141)
   org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:90)
   org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:417)
root cause
java.lang.NullPointerException
   org.apache.catalina.util.CharsetMapper.getCharset(CharsetMapper.java:106)
   org.apache.catalina.connector.Response.setLocale(Response.java:852)
   org.apache.catalina.connector.ResponseFacade.setLocale(ResponseFacade.java:323)
   javax.servlet.ServletResponseWrapper.setLocale(ServletResponseWrapper.java:201)
   org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1035)
   org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:798)
   org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
   org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647)
   org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:563)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
   org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:195)
   org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:159)
   org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:141)
   org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:90)
   org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:417)

I don't know if I invoke correct webapp (activiti-explorer)? Do I also have to login to activiti before starting the process?

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Comments

opal

Ok, it's better now. I've searched docs properly and now with this code:

<br> DefaultHttpClient dhc = new DefaultHttpClient();<br> HttpPost hp = new HttpPost("<a href="http://localhost:8080/activiti-rest/service/process-instance" rel="nofollow noopener noreferrer">http://localhost:8080/activiti-rest/service/process-instance</a>");<br> hp.setEntity(new StringEntity("{\"processDefinitionId\":\"helloworld:1\"}", "UTF-8"));<br> HttpResponse processResponse = dhc.execute(hp);<br> System.out.println(IOUtils.toString(processResponse.getEntity().getContent()));<br> dhc.getConnectionManager().shutdown();<br>

I get this response:

This request requires HTTP authentication ().

So the question now is how to perform authentication?

opal

Ok, done. Here is the final version of the code:

<br>DefaultHttpClient dhc = new DefaultHttpClient();<br>dhc.getCredentialsProvider().setCredentials(new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT, AuthScope.ANY_REALM), new UsernamePasswordCredentials("kermit", "kermit"));<br>HttpPost hp = new HttpPost("<a href="http://localhost:8080/activiti-rest/service/process-instance" rel="nofollow noopener noreferrer">http://localhost:8080/activiti-rest/service/process-instance</a>");<br>hp.setEntity(new StringEntity("{\"processDefinitionId\":\"helloworld:1\"}", "UTF-8"));<br>HttpResponse processResponse = dhc.execute(hp);<br>System.out.println(IOUtils.toString(processResponse.getEntity().getContent()));<br>dhc.getConnectionManager().shutdown();<br>

I'm sorry for multiple posts, but at least it'll be easy to find the solution in one place.

frederikherema1

The rest-services in activiti use BASIC HTTP authentication. I presume you are using Apache HTTPComponents, which exposes an easy way to set the authentication, eg:

<br>DefaultHttpClient httpclient = new DefaultHttpClient();<br><br>httpclient.getCredentialsProvider().setCredentials(<br>&nbsp; new AuthScope("localhost", 8080), <br>&nbsp; new UsernamePasswordCredentials("kermit", "kermit"));<br><br>&hellip;<br>

frederikherema1

Didn't see your last reply. Looks like you found the solution

opal

Yes ;] I've already found the solution. Nevertheless thanks for Your input.

gumba

hi all I tried to implement your solution but a get an error, How did you managed to solve your error:
First I tried this one:
 DefaultHttpClient dhttpclient = new DefaultHttpClient();

 dhttpclient.getCredentialsProvider().setCredentials(
 new AuthScope("localhost", 8080),
 new UsernamePasswordCredentials("kermit", "kermit"));
 HttpPost postUrl = new HttpPost(
 "http://localhost:8080/activiti-rest/service/process-instance");


 postUrl.setEntity(new StringEntity(
 "{\"processDefinitionId\":\"MailSender:1:16516\"}", "UTF-8"));

 HttpResponse processResponse = dhttpclient.execute(postUrl);

 System.out.println(IOUtils.toString(processResponse.getEntity()
 .getContent()));

 dhttpclient.getConnectionManager().shutdown();

I got the following error:
<html>
<head>
 <title>Status page</title>
</head>
<body style="font-family: sans-serif;">
Forbidden
Authentication is required
You can get technical details <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.4">here</a>. 
Please continue your visit at our <a href="/">home page</a>.

</body>
</html>

Then with this one a got another
the code:
import org.apache.commons.io.IOUtils;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.AuthCache;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.protocol.ClientContext;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.auth.BasicScheme;
import org.apache.http.impl.client.BasicAuthCache;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;

public class RestAPI {

/**
* @param args
*/
public static void main(String[] args) {
try {
 // TODO Auto-generated method stub
 DefaultHttpClient client = new DefaultHttpClient();
 client.getCredentialsProvider().setCredentials(new AuthScope("localhost", 8080),
 new UsernamePasswordCredentials("kermit", "kermit"));

 // Create AuthCache instance
 AuthCache authCache = new BasicAuthCache();
 // Generate BASIC scheme object and add it to the local auth cache
 BasicScheme basicAuth = new BasicScheme();
 authCache.put(new HttpHost("localhost", 8080, "http"), basicAuth);

 // Add AuthCache to the execution context
 BasicHttpContext localcontext = new BasicHttpContext();
 localcontext.setAttribute(ClientContext.AUTH_CACHE, authCache);
 HttpPost postMethod = new HttpPost("http://localhost:8080/activiti-rest/service/process-instance");

 postMethod.setEntity(new StringEntity("{\"processDefinitionKey\":\"MailSender\"}", "UTF-8"));
 HttpResponse response = client.execute(postMethod, localcontext);
 System.out.println(IOUtils.toString(response.getEntity().getContent()));
 client.getConnectionManager().shutdown();
 } catch (Exception e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }



}

}

the error:

<html>
<head>
 <title>Status page</title>
</head>
<body style="font-family: sans-serif;">
Internal Server Error
Failed to retrieve the process definition parameters
You can get technical details <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.5.1">here</a>. 
Please continue your visit at our <a href="/">home page</a>.

</body>
</html>

What am I doing wrong?