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SOLVED

Null Pointer Exception in Servlet Testing which having OSGi configurations

siva_k222
Level 2
Level 2

Hi Guys,
I am new to AEM development and trying to create Junit(Version 4) test cases for my servlet. I am calling an external API and getting JSON data rates in response, during this i am using OSGi configurations for few api related information. I am getting null pointer exception during the test run. Can anyone help me what i am missing here, below are my servlet and test classes code.

Servlet:
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import com.services.RatesIntegrationService;
import com.google.gson.JsonArray;
import com.google.gson.JsonParser;
import org.apache.commons.codec.binary.Base64;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.HttpConstants;
import org.apache.sling.api.servlets.SlingAllMethodsServlet;
import com.google.gson.JsonObject;
import org.osgi.framework.Constants;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@component(service = Servlet.class, property = {Constants.SERVICE_DESCRIPTION + "=Rates Servlet",
"sling.servlet.methods=" + HttpConstants.METHOD_POST, "sling.servlet.paths=" + "/services/rates/"
})
public class RatesServlet extends SlingAllMethodsServlet {
String apiURL=null;
String tokenApiURL=null;
String secret=null;
String appID=null;
@reference
private RatesIntegrationService ratesIntegrationService;
protected final Logger log = LoggerFactory.getLogger(RatesServlet.class);
private static final String scope = "/**/communications::POST";
private String token;
@Override
protected void doPost(final SlingHttpServletRequest req, final SlingHttpServletResponse resp)
throws ServletException, IOException {
apiURL= ratesIntegrationService.getApiURL();
tokenApiURL = ratesIntegrationService.getTokenApiURL();
secret = ratesIntegrationService.getSecret();
appID = ratesIntegrationService.getAppID();
try {
generateToken(req);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
}
String market = req.getParameter("market");
TimeZone tz = TimeZone.getTimeZone("UTC");
DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"); // Quoted "Z" to indicate UTC, no timezone offset
df.setTimeZone(tz);
String nowAsISO = df.format(new Date());
CloseableHttpClient client = HttpClients.createDefault();
HttpPost method = new HttpPost(this.apiURL);
JsonObject json = new JsonObject();
json.addProperty("market", market);
json.addProperty("rateVarianceTimestamp", nowAsISO);
StringEntity entity = new StringEntity(json.toString(), ContentType.APPLICATION_JSON);
method.setEntity(entity);
String authorizationHeader="claims app_authorization="+String.valueOf(this.token);
method.setHeader("Content-Type", "application/json");
method.setHeader("app-id", this.appID);
method.setHeader("Authorization", authorizationHeader);
try {
CloseableHttpResponse response = client.execute(method);
System.out.println(response);
String ratesVarianceResponse = EntityUtils.toString(response.getEntity());
resp.setContentType("application/json");
resp.getWriter().write(ratesVarianceResponse);
} catch (Exception e) {
log.error("Exception in servlet while executing :", e.getMessage());
e.printStackTrace();
} finally {
method.releaseConnection();
}
}

}


Test Class:

package com.servlets;
import com.services.RatesIntegrationService;
import com.services.config.RatesIntegrationServiceConfig;
import com.services.impl.RatesIntegrationServiceImpl;
import io.wcm.testing.mock.aem.junit.AemContext;
import org.apache.sling.testing.mock.sling.ResourceResolverType;
import org.apache.sling.testing.mock.sling.junit.SlingContext;
import org.apache.sling.testing.mock.sling.servlet.MockSlingHttpServletRequest;
import org.apache.sling.testing.mock.sling.servlet.MockSlingHttpServletResponse;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;
import javax.servlet.ServletException;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import static org.junit.Assert.*;
import static org.mockito.Mockito.*;
@RunWith(MockitoJUnitRunner.class)
public class RatesServletTest {
@rule
public final AemContext aemContext = new AemContext(ResourceResolverType.JCR_MOCK);
@InjectMocks
private RatesServlet testServlet;
@Mock
private MockSlingHttpServletRequest mockSlingRequest;
@Mock
private MockSlingHttpServletResponse mockSlingResponse;
@Mock
private RatesIntegrationService ratesIntegrationService;
@InjectMocks
private RatesIntegrationServiceImpl ratesIntegrationServiceImpl;
private Map<String, String> configProps = new HashMap<String, String>();
private Map<String, Object> parameterMap = new HashMap<String, Object>();
@Before
public void setUp() throws Exception {
ratesIntegrationServiceImpl=aemContext.registerService(new RatesIntegrationServiceImpl());
RatesIntegrationServiceConfig config=mock(RatesIntegrationServiceConfig.class);
when(config.apiURL()).thenReturn("https://api-domain.com");

when(config.secret()).thenReturn("AvnoqId=");
when(config.appID()).thenReturn("94b5fba");
ratesIntegrationServiceImpl.activate(config);
}
@test
public void doPostTest() throws ServletException, IOException {
parameterMap.put("market", "UK");
mockSlingRequest.setParameterMap(parameterMap);
testServlet.doPost(mockSlingRequest, mockSlingResponse);
assertEquals("application/json", mockSlingResponse.getContentType());
assertEquals(200, mockSlingResponse.getStatus());
assertTrue(mockSlingResponse.getOutputAsString().contains("UK"));
}
}

1 Accepted Solution
MohitKumarK
Correct answer by
Level 4
Level 4

Hi @siva_k222 ,

Instead of having when for config.apiUrl have when then for ratesIntegrationServiceImpl.getApiUrl and similarly for other variables.

Thanks!

View solution in original post

2 Replies
MohitKumarK
Correct answer by
Level 4
Level 4

Hi @siva_k222 ,

Instead of having when for config.apiUrl have when then for ratesIntegrationServiceImpl.getApiUrl and similarly for other variables.

Thanks!

View solution in original post