Unable to use http connector - camunda

Question

I'm trying to use the http connector that is provided with the standard Camunda implementation with no luck. Every single time that I run my workflow the instance simply freeze on that activity. I'm using this class in an execution listnener and the code that I'm using is this:
import org.apache.ibatis.logging.LogFactory;
import org.camunda.bpm.engine.delegate.DelegateExecution;
import org.camunda.bpm.engine.delegate.Expression;
import org.camunda.bpm.engine.delegate.JavaDelegate;
import org.camunda.bpm.engine.impl.util.json.JSONObject;
import org.camunda.connect.Connectors;
import org.camunda.connect.ConnectorException;
import org.camunda.connect.httpclient.HttpConnector;
import org.camunda.connect.httpclient.HttpResponse;
import org.camunda.connect.httpclient.impl.HttpConnectorImpl;
import org.camunda.connect.impl.DebugRequestInterceptor;
public class APIAudit implements JavaDelegate {
static {
LogFactory.useSlf4jLogging(); // MyBatis
}
private static final java.util.logging.Logger LOGGER = java.util.logging.Logger.getLogger(Thread.currentThread().getStackTrace()[0].getClassName());
private Expression tokenField;
private Expression apiServerField;
private Expression questionIDField;
private Expression subjectField;
private Expression bodyField;
public void execute(DelegateExecution arg0) throws Exception {
String tokenValue = (String) tokenField.getValue(arg0);
String apiServerValue = (String) apiServerField.getValue(arg0);
String questionIDValue = (String) questionIDField.getValue(arg0);
String subjectValue = (String) subjectField.getValue(arg0);
String bodyValue = (String) bodyField.getValue(arg0);
if (apiServerValue != null) {
String url = "http://" + apiServerValue + "/v1.0/announcement";
LOGGER.info("token: " + tokenValue);
LOGGER.info("apiServer: " + apiServerValue);
LOGGER.info("questionID: " + questionIDValue);
LOGGER.info("subject: " + subjectValue);
LOGGER.info("body: " + bodyValue);
LOGGER.info("url: " + url);
JSONObject jsonBody = new JSONObject();
jsonBody.put("access_token", tokenValue);
jsonBody.put("source", "SYSTEM");
jsonBody.put("target", "AUDIT");
jsonBody.put("tType", "system");
jsonBody.put("aType", "auditLog");
jsonBody.put("affectedItem", questionIDValue);
jsonBody.put("subject", subjectValue);
jsonBody.put("body", bodyValue);
jsonBody.put("language", "EN");
try {
LOGGER.info("Generating connection");
HttpConnector http = Connectors.getConnector(HttpConnector.ID);
LOGGER.info(http.toString());
DebugRequestInterceptor interceptor = new DebugRequestInterceptor(false);
http.addRequestInterceptor(interceptor);
LOGGER.info("JSON Body: " + jsonBody.toString());
HttpResponse response = http.createRequest()
.post()
.url(url)
.contentType("application/json")
.payload(jsonBody.toString())
.execute();
Integer responseCode = response.getStatusCode();
String responseBody = response.getResponse();
response.close();
LOGGER.info("[" + responseCode + "]: " + responseBody);
} catch (ConnectorException e) {
LOGGER.severe(e.getMessage());
}
} else {
LOGGER.info("No APISERVER provided");
}
LOGGER.info("Exiting");
}
}
I'm sure that the fields injection works correctly since the class prints the correct values. I also used the http-connector in javascript in the same activity with no problem.
I'm using this approach since I need to make two different calls to external REST services in the same task, so any advice will be very welcome.

Answer 1

You need to enable Connect process engine plugin in process engine configuration. Not sure how you configured the process engine, make sure to add this plugin org.camunda.connect.plugin.impl.ConnectProcessEnginePlugin
Also check the following in dependencies
Do not add both dependencies - connectors-all and http-connector.
Make sure to check the error logs and see whether you have any class loading problem related to httpclient classes
I am pretty sure there is a class loading issue with http client library. make sure to include the correct version of connectors-all dependency