CloseableHttpClient can't execute in AEM

[HanL1]

Hi 

I created a AEM servlet to call a external API and I tried to test it on local, my problem is that the CloseableHttpClient can not be executed.

@SlingServlet(paths={"/bin/test01"},methods= {"POST"},metatype=false)
public class OauthAuthServlet extends SlingAllMethodsServlet {
    /**
	 * 
	 */
	private static final long serialVersionUID = -4325654356300019990L;
	
    private  final Logger log = LoggerFactory.getLogger(OauthAuthServlet.class);
    
    CloseableHttpClient httpPostClient = HttpClients.createDefault();
	
	public static String OAUTH_SERVER_URL = "https://dm-us.informaticacloud.com/authz-service/oauth/token";

	@Override
    protected void doGet( SlingHttpServletRequest request,  SlingHttpServletResponse response) {
    	
		this.doPost(request, response);  	
    }
	
	@Override
    protected void doPost( SlingHttpServletRequest request,  SlingHttpServletResponse response){
    	String cc= request.getParameter("CLIENT_CREDENTIALS");
    	String token = null;
    	setLocalHttpProxy();
    	CloseableHttpClient httpClient = HttpClients.createDefault();
    	HttpPost httpPost = new HttpPost(OAUTH_SERVER_URL);
    	String header = "Basic "+cc;
    	httpPost.addHeader("Authorization", header);
    	List<NameValuePair> formparams = new ArrayList<>();
    	formparams.add(new BasicNameValuePair("grant_type","client_credentials"));
    	try {
			httpPost.setEntity(new UrlEncodedFormEntity(formparams));
			RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(10000).setConnectTimeout(10000).build();
			httpPost.setConfig(requestConfig);
			CloseableHttpResponse httpResponse = httpClient.execute(httpPost);
			try {
				HttpEntity entity = httpResponse.getEntity();
				token=EntityUtils.toString(entity);
			}catch(Exception e) {
				e.printStackTrace();
			}finally {
				httpResponse.close();
			}
    	}catch(Exception e) {
    		e.printStackTrace();
    	}finally {
    		try {
    			httpClient.close();
    		}catch(Exception e) {
    			e.printStackTrace();
    		}
    	}

    	try {
			response.getWriter().write(token);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

The servlet always skip this line "

CloseableHttpResponse httpResponse = httpClient.execute(httpPost);", I don't see any errors pop up in logs.

Please give me some advises, thank you.

[Avinash_Gupta_]

Hi @HanL1 

Your servlet looks good to me however, we can try few options:-

1. Comment out this line 

	RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(10000).setConnectTimeout(10000).build();
			httpPost.setConfig(requestConfig);

2. Instead of using 

CloseableHttpResponse httpResponse = httpClient.execute(httpPost);

try with, 

org.apache.http.HttpResponse

Also, you have used lots of nested try and catch block, add only one try and catch block. Make these changes and give it a try. 

[Avinash_Gupta_ · Accepted solution]

Hi @HanL1 

I made few changes on your code and executed it on my local. Servlet is getting executed and response is coming back. Let me know if are still facing any issue.

@Component(
        service=Servlet.class,
        property={
                Constants.SERVICE_DESCRIPTION + "=Custom Servlet",
                "sling.servlet.methods=" + HttpConstants.METHOD_POST,
                "sling.servlet.paths=" + "/bin/test"
        }
)
public class OauthAuthServlet extends SlingAllMethodsServlet {
    /**
     *
     */
    private static final long serialVersionUID = -4325654356300019990L;

    private  final Logger log = LoggerFactory.getLogger(OauthAuthServlet.class);

    CloseableHttpClient httpPostClient = HttpClients.createDefault();

    public static String OAUTH_SERVER_URL = "https://dm-us.informaticacloud.com/authz-service/oauth/token";

    @Override
    protected void doGet( SlingHttpServletRequest request,  SlingHttpServletResponse response) {

        this.doPost(request, response);
    }
    @Override
    protected void doPost( SlingHttpServletRequest request,  SlingHttpServletResponse response) {
        CloseableHttpClient httpClient = null;
        try {
        String cc= request.getParameter("CLIENT_CREDENTIALS");
        String token = null;
         httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(OAUTH_SERVER_URL);
        String header = "Basic "+cc;
        httpPost.addHeader("Authorization", header);
        List<NameValuePair> formparams = new ArrayList<>();
        formparams.add(new BasicNameValuePair("grant_type","client_credentials"));
            httpPost.setEntity(new UrlEncodedFormEntity(formparams));
            RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(10000).setConnectTimeout(10000).build();
            httpPost.setConfig(requestConfig);
            CloseableHttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity entity = httpResponse.getEntity();
                token=EntityUtils.toString(entity);
            response.getWriter().write(token);
            httpClient.close();
        }catch (IOException e) {
            throw new RuntimeException(e);
        } catch(Exception e) {
            e.printStackTrace();
        }
    }}

[HanL1]

Hi @Avinash_Gupta_ 

Thank you for your response , I tried it but still doesn't work. It turns out it's proxy issue since I am using company laptop. 

[Avinash_Gupta_]

@HanL1 Glad it worked