Building a executable JAR file with external libraries through JDeveloper

Building a executable JAR file with external libraries through JDeveloper

This post explain the different approaches to build the executable JAR file with external libraries through JDeveloper.

Referring the external libraries from JAR:

Right Click project and select properties
Click on Deployment and create new JAR deployment profile.
Select "Include Manifest File" option.
Select the main class.

Create a manifest file(any location) and add the required jar files to the Class-Path header

Class-Path.mf

Class-Path: json.jar log4j.jar

 End the Class-Path.mf file by a carriage return.

Add the Class-Path.mf file to Additional Manifest Files to Merge into Manifest.mf

Encrypting/Decrypting data in Adobe Experience Manager(AEM)

Encrypting/Decrypting data in Adobe Experience Manager

com.adobe.granite.crypto.CryptoSupport service can be used to encrypt/decrypt the data in Adobe Experience Manager(AEM).

Maven Dependency:

<dependency>
  <groupId>com.adobe.granite</groupId>
        <artifactId>com.adobe.granite.crypto</artifactId>
         <version>0.0.18</version>
         <scope>provided</scope>
 </dependency>

Service to encrypt/decrypt the message:

import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.Service;
import com.adobe.granite.crypto.CryptoException;
import com.adobe.granite.crypto.CryptoSupport;

@Component(immediate = true, metatype = true)
@Service(value = EncrypionService.class)
public class EncrypionService {
@Reference
private CryptoSupport cryptoSupport;

public String encrypt(String plainText) throws Exception
{
try {
return cryptoSupport.protect(plainText);
} catch (CryptoException e) {
throw e;
}
}

public String decrypt(String encryptedText) throws Exception
{
try {
return cryptoSupport.unprotect(encryptedText);
} catch (CryptoException e) {
throw e;
}
}
}

org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught Throwable java.lang.LinkageError: loader constraint violation - Adobe Experience Manager(AEM)

org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught Throwable java.lang.LinkageError: loader constraint violation - Adobe Experience Manager(AEM)

Sometimes we may receive the following exception while invoking the Adobe Experience Manager(AEM) services.

20.12.2014 11:15:31.816 *ERROR* [0:0:0:0:0:0:0:1 [1419054331815] GET /services/EmailServlet HTTP/1.1] org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught Throwable java.lang.LinkageError: loader consaint violation: when resolving interface method "com..commerce.connector.CommerceService.getSession(Ljavax/servlet/http/HttpServleequest;Ljavax/servlet/http/HttpServleesponse;)Lcom//commerce/connector/session/CommerceSession;" the class loader (instance of org/apache/felix/framework/BundleWiringImpl$BundleClassLoaderJava5) of the current class, com///servlet/EmailServlet, and the class loader (instance of org/apache/felix/framework/BundleWiringImpl$BundleClassLoaderJava5) for resolved class, com//commerce/connector/CommerceService, have different Class objects for the type connector.CommerceService.getSession(Ljavax/servlet/http/HttpServleequest;Ljavax/servlet/http/HttpServleesponse;)Lcom//commerce/connector/session/CommerceSession; used in the signature

at com...servlet.EmailServlet.doPost(EmailServlet.java:67)

at com...servlet.EmailServlet.doGet(EmailServlet.java:56)

at org.apache.sling.api.servlets.SlingSafeMethodsServlet.mayService(SlingSafeMethodsServlet.java:268)

at org.apache.sling.api.servlets.SlingAllMethodsServlet.mayService(SlingAllMethodsServlet.java:139)

This error will be thrown while invoking the service of one bundle from another bundle.

To fix this issue, make sure the required packages from the target bundle is imported to the source bundle.

org.apache.sling.security.impl.ReferrerFilter Rejected empty referrer header for POST request -Adobe Experience Manager(AEM)

org.apache.sling.security.impl.ReferrerFilter Rejected empty referrer header for POST request - Adobe Experience Manager(AEM)

We will receive the following exception while testing the Adobe Experience Manager(AEM) POST Servlets from Rest client.

15.12.2014 22:55:01.434 *INFO* [0:0:0:0:0:0:0:1 [1418664301434] POST /services/EmailServlet HTTP/1.1] org.apache.sling.security.impl.ReferrerFilter Rejected empty 

referrer header for POST request to /services/EmailServlet

This error is is due to the Apache Sling Referrer Filter will not allow empty Referer address by default.

For testing purpose, we can allow empty referrer by changing the Apache Sling Referrer Filter.

Apache Sling Referrer Filter configuration

Go to the Felix Console - http://localhost:4502/system/console/configMgr

Search for "Apache Sling Referrer Filter"

Select "Allow Empty"

This should be only enabled for testing purpose in dev environment.

Sending mail through Java API with Gmail server – Adobe Experience Manager(AEM)

Sending mail through Java API with Gmail server – Adobe Experience Manager(AEM)

This post will explain the steps required to send mail in Adobe Experience Manager(AEM) through Java API with Gmail server.

Configure mail service:

Go to the Felix Console - http://localhost:4502/system/console/configMgr
Search for Day CQ Mail Service
Enter the Gmail server details as shown below and Save the data.

SMTP Server Host   - smtp.gmail.com
SMTP Server Port    - 465
SMTP User              - your gmail username
SMTP Password      - your password
From Address          - your email
SMTP Use SSL      - true

You may need to enable the access for less secure apps in google account - https://www.google.com/settings/security/lesssecureapps

Email Template:

Create the email template as text file and store it in repository - /etc/email/template/emailTemplate.txt (change the path accordingly)

how to create the page through Java API in Adobe Experience Manager(AEM)

how to create the page through Java API in Adobe Experience Manager(AEM)

This post will explain how to create a page through Java API in Adobe Experience Manager(AEM)

Create the API service

This service create a sample page in Adobe Experience Manager(AEM).

import javax.jcr.Node;
import javax.jcr.Session;

import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.api.resource.ResourceResolverFactory;
import org.osgi.service.component.ComponentContext;

import com.day.cq.wcm.api.Page;
import com.day.cq.wcm.api.PageManager;

@Component(immediate = true, label = "Create Page Service", description = "Create Sample Page", metatype = true)
@Service(value = CreateSamplePage.class )
public class CreateSamplePage   {

@Reference
private ResourceResolverFactory resolverFactory;
private ResourceResolver resourceResolver;
 
private void createPage() throws Exception {
String path="/content/poc";
String pageName="samplePage";
String pageTitle="Sample Page";
String template="/apps/geometrixx/templates/homepage";
String renderer="geometrixx/components/homepage";

this.resourceResolver = this.resolverFactory.getAdministrativeResourceResolver(null);
    Page prodPage = null;
    Session session = this.resourceResolver.adaptTo(Session.class);
    try {
    if (session != null) {

    // Create Page    
    PageManager pageManager = this.resourceResolver.adaptTo(PageManager.class);
    prodPage = pageManager.create(path, pageName, template, pageTitle);
    Node pageNode = prodPage.adaptTo(Node.class);

Node jcrNode = null;
if (prodPage.hasContent()) {
jcrNode = prodPage.getContentResource().adaptTo(Node.class);
} else {                
jcrNode = pageNode.addNode("jcr:content", "cq:PageContent");
}
          jcrNode.setProperty("sling:resourceType", renderer);
     
     
         Node parNode = jcrNode.addNode("par");
         parNode.setProperty("sling:resourceType", "foundation/components/parsys");

 Node textNode = parNode.addNode("text");
 textNode.setProperty("sling:resourceType", "foundation/components/text");
 textNode.setProperty("textIsRich", "true");
 textNode.setProperty("text", "Test page");

session.save();
        session.refresh(true);
 }
       
} catch (Exception e) {
throw e;
} 
   }    
}

java.net.ConnectException,Bootstrap to server failed while deploying the compoite - Orace SOA Suite

 java.net.ConnectException,Bootstrap to server failed while deploying the compoite - Orace SOA Suite

Sometimes we may receive the following exception while deploying the composite to Oracle SOA Suite server using even though the sever is running fine and reachable.

oracle.rc.asadapter.connection.ConnectionException
at oracle.rc.asadapter.weblogic.connection.spi.Weblogic10JndiProvider.getPresentation(Weblogic10JndiProvider.java:86)

Caused by: javax.naming.CommunicationException [Root exception is java.net.ConnectException: t3://127.0.0.1:8000: Bootstrap to localhost/127.0.0.1:8000 failed. It is likely that the remote side declared peer gone on this JVM]
at weblogic.jndi.internal.ExceptionTranslator.toNamingException(ExceptionTranslator.java:40)

Caused by: java.net.ConnectException: t3://127.0.0.1:8000: Bootstrap to localhost/127.0.0.1:8000 failed. It is likely that the remote side declared peer gone on this JVM

Caused by: java.rmi.ConnectException: Bootstrap to localhost/127.0.0.1:8000 failed. It is likely that the remote side declared peer gone on this JVM
at weblogic.rjvm.ConnectionManager.bootstrap(ConnectionManager.java:334)

This issue can be resolved by configuring valid machine IP or complete name of the machines, including the domain extension as listen address in weblogic server.

Can not write to the specified destfile - Error while deploying through jenkins

Can not write to the specified destfile - Error while deploying through jenkins

Some times we may receive the following error "Can not write to the specified destfile"  while performing the deployment through Jenkins.

The error is due to the user running the Jenkins(the user installed the Jenkins) is not having the permission to write the content to the specified file.

To fix the issue make the owner of the file/folder to the user running the Jenkins

chown -R jenkins:jenkins hybris

Provide the required permission to the file/folder

chmod 777

Implementing Internationalization with i18n in Adobe CQ5

Implementing Internationalization with i18n in Adobe CQ5

This post will explain how to implement Internationalization with i18n in Adobe CQ5

Configuring i18 keys:

Create a sling:folder i18n inside apps or apps/<<application>> or inside the components folder based on the scope. e.g. /apps/i18n or apps/myapp/i18n or apps/myapp/global/components/mycomponent/i18n

Create a folder for each language inside 118n folder

Assign mixin to the language folders created in the previous step (e.g. en, ar etc) from crx console mix:language

For the language nodes (e.g. en, ar etc) add String property jcr: language, value = ISO language code (en, es etc)

Create nodes of type sling:MessageEntry for each field label

Add 2 properties sling:key = <keyname> and sling:message = <message>

Save all the changes

Using the i18n keys in JSP:

<%@page session="false"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>

<%@page import="java.util.Locale,java.util.ResourceBundle,com.day.cq.i18n.I18n"%>

<%@include file="/libs/foundation/global.jsp"%>

<cq:setContentBundle/>

<%

final Locale pageLocale = currentPage.getLanguage(false);

final ResourceBundle resourceBundle = slingRequest.getResourceBundle(pageLocale);

I18n i18n = new I18n(resourceBundle);

%>

<%= i18n.get("cartItem") %>

how to Invoke the SOAP services from Adobe CQ5

how to Invoke the SOAP services from Adobe CQ5

This post will explain how to invoke the SOAP services from Adobe CQ5

Configure wsimport  plugin to POM.xml:

<plugin>
   <groupId>org.codehaus.mojo</groupId>
   <artifactId>jaxws-maven-plugin</artifactId>
   <version>1.12</version>
   <executions>
      <execution>
         <goals>
            <goal>wsimport</goal>
         </goals>
      </execution>
   </executions>
   <configuration>
      <verbose>true</verbose>
      <args>
         <arg>-B-XautoNameResolution</arg>
      </args>
      <wsdlUrls>
         <wsdlUrl>http://localhost:8080/services/AddressService_1.0.wsdl</wsdlUrl>
      </wsdlUrls>
      <sourceDestDir>src/main/java/</sourceDestDir>
      <packageName>com.ws.address.validation</packageName>
   </configuration>
</plugin>

Change the wsdlurl,sourceDestDir and packageName accordingly.

User name and password do not match error while accessing CRXDE - Adobe CQ5

User name and password do not match error while accessing CRXDE - Adobe CQ5

Sometimes we may receive User name and password do not match error while accessing the CRXDE and also Authentication Failed error while accessing the Adobe CQ5 configMgr.

We will be receiving this error if the anonymous user account is deleted accidentally.

How to fix

This can be fixed by restarting the repository, anonymous user account will be re-created upon repository restart.

Enabling SSL in Dispatcher with self signed certificate - Adobe CQ5

Enabling SSL in Dispatcher with self signed certificate - Adobe CQ5

This post will explain how to Enabling SSL in Dispatcher with self signed certificate in Adobe CQ5

Generating Self signed certificate in Dispatcher:

Create a folder ssl under /etc/httpd/ directory.
Generate server.key and server.crt file by running the following command:

openssl req -new -x509 -sha1 -newkey rsa:1024 \
-nodes -keyout /etc/httpd/ssl/server.key -out /etc/httpd/ssl/server.crt \
-subj '/O=<Organization>/OU=<Department>/CN= <Common Name>'

Change the <Organization>, <Department> and <Common Name> accordingly.

Configure Dispatcher:

Install mod_ssl.so by running the following command
yum install mod_ssl

Modify the VirtualHost in /etc/httpd/conf.d/ssl.conf file with the host name.

<VirtualHost test.server.com:443>

Also, specify the server certificate and key path in the below properties.

SSLCertificateFile /etc/httpd/ssl/server.crt
SSLCertificateKeyFile /etc/httpd/ssl/server.key

Restart the Apache HTTP Server,now we can able to access the urls through https.

How to configure SAML SSO for Adobe CQ5

Configuring SAML SSO for Adobe CQ5

Configure Apache Referrer Filter:

Navigate to the web console: http://HOST:4502/system/console/configMgr

Expand Apache Sling Referrer Filter

Add the SAML SSO server host name to the Allowed Hosts section (depending on the authoring environment you are configuring), Check the Allow Empty checkbox and Click Save.

Configure Adobe Granite SAML 2.0 Authentication Handler:

Configured the required details for authentication

Path	/
Service Ranking	5002
IPD URL	https://host/SAML2/sso/SAML2Service - URL of the IDP where the SAML Authentication Request should be sent to
IDP HTTP Redirect	Unchecked - Use an HTTP Redirect to the IDP URL instead of sending an AuthnRequest-message to request credential
Service Provider Entity ID	http://dev-author.com/ - ID which uniquely identifies this service provider with the identity provider
Default Redirect	/
User ID Attribute	UserID - The name of the attribute containing the user ID used to authenticate and create the user in the CRX repository
Use Encryption	Unchecked - Whether or not this authentication handler expects encrypted SAML assertions
Autocreate CRX Users	Unchecked - Whether or not to autocreate nonexisting users in the repository
Add to Groups	Unchecked - Whether or not a user should be autmatically added to CRX groups after successful authentication
Group Membership	<empty--no value> - The name of the attribute containing a list of CRX groups this user should be added to
NameIDPolicy Format	urn:oasis:names:tc:SAML:2.0:nameid-format:unspecified - The value of the NameIDPolicy format parameter to send in the AuthnRequest message.

Referencing the services between OSGI bundles – AEM

Referencing the services between OSGI bundles – AE

This post explains how to refer the services between OSGI bundles in Adobe Experience Manager.

Export-Package:

Bundles may export zero or more packages from the JAR to be consumable by other bundles. The export list is a comma-separated list of fully-qualified packages, often with a version attribute. If not specified, the version defaults so 0.0.0.

In the target bundle the packages contains the required services and the classes exposed to the other bundles should be exported.

Import-Package 

The Import-Package header is used to declare dependencies at a package level from the bundle. At runtime, the bundle will be wired up with whatever (compatible) bundle offers the package.

In the source bundle the packages contains the required services and classes referred from other bundle should be imported.

Not able to create the session in OSB console - Could not create directory /osb/config/sessions/weblogic

Not able to create the session in OSB console - Could not create directory <DOMAIN_HOME>/osb/config/sessions/weblogic

Sometimes we may receive the error "could not create directory <DOMAIN_HOME>/osb/config/sessions/weblogic" in the OSB console while trying to create the session.

There will be a multiple reason for this issue, in our case the root cause of the exception is the space is full for the mount  point

How to Fix

To resolve the issue add extra space to the mount point or clear some of the unwanted files and make the required space.

XML-22036: (Error) Cannot convert result tree fragment to NodeSet - Oracle SOA Suite 11g

XML-22036: (Error) Cannot convert result tree fragment to NodeSet - Oracle SOA Suite 11g

We are getting the below exception in runtime while passing the parameter and accessing the same from XSLT in Oracle SOA Suite.

The following exception occurred while attempting to execute operation copy at line 139
-<exception class="com.collaxa.cube.xml.xpath.XPathException">
-<parsererror style="display: block; white-space: pre; border: 2px solid #c77; padding: 0 1em 0 1em; margin: 1em; background-color: #fdd; color: black">
<h3>This page contains the following errors:</h3>
<div style="font-family:monospace;font-size:12px">
error on line 7 at column 1: Extra content at the end of the document
</div>
<h3>Below is a rendering of the page up to the first error.</h3>
</parsererror>
XPath expression failed to execute.
An error occurs while processing the XPath expression; the expression is ora:doXSLTransformForDoc('xsl/DistinctPayload.xsl', $inputVariableLocal.payload, 'FlowSubscriberVar2', $FlowSubscriberVar2).
The XPath expression failed to execute; the reason was: javax.xml.transform.TransformerException: oramds:/deployed-composites/default/PPDSOM_EventManager_rev1.0/xsl/DistinctPayload.xsl<Line 8, Column 82>: XML-22036: (Error) Cannot convert result tree fragment to NodeSet..
Check the detailed root cause described in the exception message text and verify that the XPath query is correct.
-<stack>
<f>com.collaxa.cube.xml.xpath.BPELXPathUtil.evaluate#262</f>
<f>com.collaxa.cube.engine.ext.bpel.common.BPELWMPHelper.evalFromValue#339</f>
<f>com.collaxa.cube.engine.ext.bpel.v1.wmp.BPEL1AssignWMP.__executeStatements#137</f>
<f>com.collaxa.cube.engine.ext.bpel.common.wmp.BaseBPELActivityWMP.perform#158</f>
<f>com.collaxa.cube.engine.CubeEngine.performActivity#2543</f>
<f>com.collaxa.cube.engine.CubeEngine._handleWorkItem#1165</f>
<f>com.collaxa.cube.engine.CubeEngine.handleWorkItem#1071</f>
<f>com.collaxa.cube.engine.dispatch.message.instance.PerformMessageHandler.handleLocal#73</f>
<f>com.collaxa.cube.engine.dispatch.DispatchHelper.handleLocalMessage#220</f>
<f>com.collaxa.cube.engine.dispatch.DispatchHelper.sendMemory#328</f>
<f>com.collaxa.cube.engine.CubeEngine.endRequest#4430</f>
<f>com.collaxa.cube.engine.CubeEngine.endRequest#4361</f>
<f>com.collaxa.cube.engine.CubeEngine._createAndInvoke#698</f>
<f>com.collaxa.cube.engine.CubeEngine.createAndInvoke#555</f>
<f>com.collaxa.cube.engine.delivery.DeliveryService.handleInvoke#673</f>
<f>com.collaxa.cube.engine.ejb.impl.CubeDeliveryBean.handleInvoke#293</f>
<f>...</f>
</stack>
</exception>

SCAC-50012 - Oracle SOA Suite 11g

SCAC-50012 - Oracle SOA Suite 11g

This error will occur most of time compiling the Oracle BPEL component in Oracle SOA Suite with java embedded activity, If there is any issue with the java code this exception will be thrown.

We were facing the SCAC-50012 exception with the following code.

String orderID  =  ((oracle.xml.parser.v2.XMLElement) getVariableData("inputVariable","payload",'/client:process/client:input')).getFirstChild().getNodeValue();
String Title=("OrderID: " +orderID);                                        
setCompositeInstanceTitle(Title);

The actual  issue with the XPATH expression specified within the single quote(copy paste issue), the compilation became successful after converting the single quotes to double quotes.

String orderID  =  ((oracle.xml.parser.v2.XMLElement) getVariableData("inputVariable","payload","/client:process/client:input")).getFirstChild().getNodeValue();
String Title=("OrderID: " +orderID);                                        
setCompositeInstanceTitle(Title);

Dynamic Endpoint Implementation through DB Table –Oracle SOA Suite

Dynamic Endpoint Implementation through DB Table –Oracle SOA Suite

The below document explain the approach to store change the endpoints of the service dynamically in Oracle SOA Suite.



Download Load_Balancer_Probe_SOA-INFRA.pdf

How to create Repository Nodes thorough Java API in Adobe Experience Manager(AEM)

How to  create Repository Nodes thorough Java in Adobe Experience Manager(AEM)

We can create the repository nodes inAdobe Experience Manager(AEM) through Java API , the below code snippet will help us to create the nodes in Adobe Experience Manager(AEM).

private static final String BASE_PATH = "/etc/commerce/products"; // the folder under which the nodes should be created

//Get the Resource resolver from request - Creating the node through Servlet
ResourceResolver resolver = request.getResourceResolver();

//Get the Resource resolver through resolver factory - Creating the node through Service
@Reference
private ResourceResolverFactory resolverFactory;//Get the resolverFactory reference in the service

ResourceResolver resolver = resolverFactory.getAdministrativeResourceResolver(null);//Get the resolver

//Get the session
Session session = resolver.adaptTo(Session.class);

//Create the Node
Node node = JcrUtil.createPath(BASE_PATH+<<Node Name>>, JcrConstants.NT_UNSTRUCTURED, session);

//Set the required properties
node.setProperty("name", "sample");
node.setProperty("description", "sample");

//Save the session
session.save();

While creating the NT_UNSTRUCTURED node make sure the parent folder is sling:folder, the node will not be created if the parent node is of type nt::folder.

Handling Parallel events through OnEvent event handlers – Oracle SOA Suite

Handling Parallel events through OnEvent event handlers – Oracle SOA Suite

This post will explain, how to handle Parallel events through OnEvent event handlers in Oracle SOA Suite 11g



Download Handling_Parallel_events_ OnEvent_event_handlers_V1.pdf

Cipher not initialized exception while invoking the Salesforce service through OSB

Cipher not initialized exception while invoking the Salesforce service through OSB

We are getting the "Cipher not initialized" exception wile invoking the Salesforce services through OSB.

We are able to invoke the login.salesforce.com URL successfully and able to receive the session id, also this exception was thrown only for a particular sandbox but the all other sandbox invocation is successful.

The "Cipher not initialized" exception will be thrown when there is no common Ciphers available between the client and server while negotiating the SSL communication.

We have raised a case with Salesforce regarding this and receive the response as "We recently upgraded our Cipher suites for SSL. To resolve the issue upgrade latest version of Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files- 6 for JDK1.6 on middleware."

After upgrading the Unlimited Strength Jurisdiction Policy Files in all the servers nodes we are able to invoke the service successfully.

Steps to resolve the issue

• Download the Unlimited Strength Jurisdiction Policy Files from http://www.oracle.com/technetwork/java/javase/downloads/index.html(Under Additional Resources" section), for java 1.6 use http://www.oracle.com/technetwork/java/javase/downloads/jce-6-download-429243.html
• Unzip the downloaded zip 
• Copy local_policy.jar and US_export_policy.jar to the $JAVA_HOME/jre/lib/security in all the OSB nodes.
• Restarts the servers.

Now you will be able to invoke the service successfully.

Integrating Adobe Experience Manager(AEM) with REST services

Integrating Adobe Experience Manager(AEM) with REST services

The below document explains the approach to integrate Adobe CQ5 with REST services.



Download Integrating_CQ5_with_RESTServices.pdf

java.io.IOException: Server returned HTTP response code: 400 - While invoking the Salesforce login url from java to get the access token

java.io.IOException: Server returned HTTP response code: 400 - While invoking the Salesforce login url from java to get the access token

I was getting the below exception while invoking the Salesforce login url to get the OAuth access_token from java.

java.io.IOException: Server returned HTTP response code: 400 for URL: https://login.salesforce.com/services/oauth2/token
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1436)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:234)
at RestCaller.execute(RestCaller.java:46)
at RestCaller.main(RestCaller.java:10)

This exception will happen normally when the values of client_id, client_security, username and password are not specified correctly while invoking the login url - https://login.salesforce.com/services/oauth2/token to get the OAuth access token.

"grant_type=password&client_id=13MVG9Y6d_xxxxxxx&client_secret=8039xxxxx&username=albinsharpxxxxx&password=Albinxxxx"

In my case, I have specified all the values properly but still it was not working, it worked after resetting the password and getting the new security token - password(password+security token)