OAuth2.0 Implementation for Google API in JAVA or PHP

Using OAuth2.0 authenticating your web application with Google API is very easy.  This will help your applications to maintain sing user repository from Google logging, and no need to maintain any password at your application side.  Here the idea is to give an idea of complete Web Server flow (Oauth2 web server side dance ) and understand it completely with complete open source technologies.

First step is go to Google API Console and register a project then create a Web Application  userid and secret key.  (Make sure that the registering URL will have your application's context path).
Note: Modify the userid/secretkeys as per your settings.

Create a web project ( say TestProject) and then create a servlet as shown below:


package com.test.oauth;

import java.io.BufferedReader;
import java.io.IOException;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.io.IOUtils;

public class OAuthTwoCallBackServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

private static String client_id = "895498929378-4uohdps8sb5v6jp8saf0rea73c0h87nr.apps.googleusercontent.com";
private static String client_secret = "LsIy_r4-S22jGwGJkbNeYQ1H";
private static String redirectURL = "http://localhost:8080/TestProject/callback";
private String auth_code = null;

public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {

System.out.println("Callback to URI that is configured in Google API Console");
resp.setContentType("text/html");
resp.getWriter().println(" ");
resp.getWriter().println(" ");
resp.getWriter().println("

");

if (req.getParameter("code") == null) {

if (req.getParameter("error") != null) {
resp.getWriter().println("Hello, " + req.getParameter("error"));
} else {

resp.getWriter().println("");
resp.getWriter().println("");
resp.getWriter().println("

"); resp.getWriter().println("");
resp.getWriter().println("

Hello

");
resp.getWriter().println("To login with Google Account click here ");
resp.getWriter().println("");
resp.getWriter().println(" resp.getWriter().println(" alt='Powered by Google App Engine' />");
resp.getWriter().println("
"); resp.getWriter().println("
"); }
} else {
resp.getWriter().println("

Code

");
resp.getWriter().println("Authentication Code = " + req.getParameter("code"));
this.auth_code = req.getParameter("code");

// Exchange the code for token
HttpClient httpclient = new HttpClient();
BufferedReader bufferedreader = null;
PostMethod postmethod = new PostMethod(
"https://accounts.google.com/o/oauth2/token");
postmethod.addParameter("code", auth_code);
postmethod.addParameter("client_id", client_id);
postmethod.addParameter("client_secret", client_secret);
postmethod.addParameter("redirect_uri", redirectURL);
postmethod.addParameter("grant_type", "authorization_code");
String access_token = null;
String token_type = null;
int expires_in = 0;
String id_token = null;
try {

int rCode = httpclient.executeMethod(postmethod);
System.out.println("HTTP POST for Token rCode is" + rCode);

if (rCode == HttpStatus.SC_NOT_IMPLEMENTED) {
System.err.println("The Post postmethod is not implemented by this URI");
postmethod.getResponseBodyAsString();
} else if (rCode == HttpStatus.SC_NOT_ACCEPTABLE) {
System.out.println(postmethod.getResponseBodyAsString());
} else {

String jsonTxt = IOUtils.toString(postmethod
.getResponseBodyAsStream());

JSONObject json = (JSONObject) JSONSerializer
.toJSON(jsonTxt);

access_token = json.getString("access_token");
token_type = json.getString("token_type");
expires_in = json.getInt("expires_in");
id_token = json.getString("id_token");
System.out.println("======== TOKEN INFO ========");
System.out.println("access_token: " + access_token);
System.out.println("token_type: " + token_type);
System.out.println("expires_in: " + expires_in);
System.out.println("id_token: " + id_token);
System.out.println("=========================");
resp.getWriter().println("

Token & Refresh

");
resp.getWriter().println("Access Token = " + access_token);
resp.getWriter().println("Refresh Token = " + id_token);
resp.getWriter().println("Expire Time (Seconds) = " + expires_in);
resp.getWriter().println("Token Type = " + token_type);
}
} catch (Exception e) {
System.err.println(e);
} finally {
postmethod.releaseConnection();
if (bufferedreader != null)
try {
bufferedreader.close();
} catch (Exception fe) {
fe.printStackTrace();
}
}

//Calling Google account info API
User user = null;
httpclient = new HttpClient();
bufferedreader = null;
GetMethod getmethod = new GetMethod("https://www.googleapis.com/oauth2/v1/userinfo?access_token=" + access_token);
try {
int rCode = httpclient.executeMethod(getmethod);
System.out.println("HTTP GET for User rCode is" + rCode);

if (rCode == HttpStatus.SC_NOT_IMPLEMENTED) {
System.err
.println("The Get method is not implemented by this URI");
getmethod.getResponseBodyAsString();
} else if (rCode == HttpStatus.SC_NOT_ACCEPTABLE) {
System.out.println(getmethod.getResponseBodyAsString());
} else {

String jsonTxt = IOUtils.toString(getmethod
.getResponseBodyAsStream());
JSONObject json = (JSONObject) JSONSerializer
.toJSON(jsonTxt);

user = new User();
user.id = json.getString("id");
user.name = json.getString("name");
user.email = json.getString("email");
user.picture = json.getString("picture");
user.gender = json.getString("gender");
user.locale = json.getString("locale");

System.out.println("============ TOKEN INFO ===============");
System.out.println("id: " + user.id);
System.out.println("name: " + user.name);
System.out.println("Gender: " + user.gender);
System.out.println("email: " + user.email);
System.out.println("pictureURL: " + user.picture);
System.out.println("Locale: " + user.locale);
System.out.println("====================================");
}
} catch (Exception e) {
System.err.println(e);
} finally {
postmethod.releaseConnection();
if (bufferedreader != null)
try {
bufferedreader.close();
} catch (Exception fe) {
fe.printStackTrace();
}
}

// Get User Information
//resp.setContentType("text/html");
resp.getWriter().println("

User Information

");
resp.getWriter().println("
");

Property

Data

resp.getWriter().println("
Id
" + user.getId()+ "
");
resp.getWriter().println("
Name
" + user.getName()+ "
");
resp.getWriter().println("
Email
" + user.getEmail()+ "
");
resp.getWriter().println("
Gender
" + user.getGender()+ "
");
resp.getWriter().println("
Image

");
resp.getWriter().println("
Locale
" + user.getLocale()+ "
");
resp.getWriter().println("
");
}
}

public class User {
public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public String getEmail() {
return email;
}

public void setEmail(String email) {
this.email = email;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getPicture() {
return picture;
}

public void setPicture(String picture) {
this.picture = picture;
}

public String getGender() {
return gender;
}

public void setGender(String gender) {
this.gender = gender;
}

public String getLocale() {
return locale;
}

public void setLocale(String locale) {
this.locale = locale;
}

String id;
String email;
String name;
String picture;
String gender;
String locale;

@Override
public String toString() {
return String.format("id:%s,name:%s,email:%s,gender:%d,locale:%s",
id, name, email, gender, locale);
}
}

public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
System.out.println("This is never called");
}
}

The web.xml file should have the following as well.

  TestProject

  

    

ServletName: OAuth2Callback

Servlet calssname: com.test.oauth.OAuthTwoCallBackServlet

Servlet Mapping: OAuth2Callback

Servlet Mapping Name /callback

     

Similarly for PHP I have create a Test project and Home.php file nothing else is required.
The Home.php :

if(!isset($_GET["code"]) || $_GET["code"] ==""){

?>

 Please click on Login button to lonon Google Apps using OAuth2.0 and get the Google Aaacount Details














}else{

$userProfile = array(
'id' => '',
'name' => '',
'gender' => '',
'email' => '',
'picture' => '',
'locale' => ''
);

$userProfile = authValidateUser($_GET["code"]);

if(isset($userProfile["email"]) && $userProfile["email"] != ""){
?>

User Property

Data

Name    
Email  
Gender
ID      
Picture
Locale  



}else{

?>

Unable to get User Data, Please try Again !!!

}

}


function authValidateUser($code)
{
$OAuth = array(
'oauth_uri' => 'https://accounts.google.com/o/oauth2/auth',
'client_id' => '284443344502-do31sm7eo7nogdcn5m0dmlgb0841r8j2.apps.googleusercontent.com',
'client_secret' => 'abUpKB-rqoBOx0DJv2fhJ44S',
'redirect_uri' => 'http://localhost/Test/Home.php',
'oauth_token_uri' => 'https://accounts.google.com/o/oauth2/token'
);

$token = array(
'access_token' => '',
'token_type' => '',
'expires_in' => '',
'refresh_token' => ''
);

$userinfo = array(
'id' => '',
'name' => '',
'gender' => '',
'email' => '',
'picture' => '',
'locale' => ''
);


if(isset($code) && $code != ""){

// now exchange Authorization code for access token and refresh token
$token_response = _get_auth_token($OAuth, $code);
$json_obj = json_decode($token_response);
$token["access_token"] = $json_obj->access_token;
$token["token_type"] = $json_obj->token_type;
$token["expires_in"] = $json_obj->expires_in;
$token["refresh_token"] = $json_obj->refresh_token;
}

if(isset($token["access_token"]) && $token["access_token"] != ""){
//Exchange Authorization code for access token and refresh token
$userinfo_response = _get_user_info($token["access_token"]);
$json_obj = json_decode($userinfo_response);
$userinfo["id"] = $json_obj->id;
$userinfo["name"] = $json_obj->name;
$userinfo["gender"] = $json_obj->gender;
$userinfo["email"] = $json_obj->email;
$userinfo["picture"] = $json_obj->picture;
$userinfo["locale"] = $json_obj->locale;
}

return $userinfo;
}

function _get_auth_token($params, $code)
{
$url = $params['oauth_token_uri'];

$fields = array(
'code' => $code,
'client_id' => $params['client_id'],
'client_secret' => $params['client_secret'],
'redirect_uri' => $params['redirect_uri'],
'grant_type' => 'authorization_code'
);

$response = _do_post($url, $fields);
return $response;
}

function _get_refresh_token($params, $code)
{
$url = $params['oauth_token_uri'];

$fields = array(
'code' => $code,
'client_id' => $params['client_id'],
'client_secret' => $params['client_secret'],
'refresh_token' => $token['refresh_token'],
'grant_type' => 'refresh_token'
);

$response = _do_post($url, $fields);
return $response;
}

function _do_post($url, $fields)
{
$fields_string = "";

foreach ($fields as $key => $value)
{
$fields_string .= $key . "=" . $value . "&";
}
$fields_string = rtrim($fields_string, "&");
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, count($fields));
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields_string);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
$response = curl_exec($ch);
curl_close($ch);

return $response;
}


function _get_user_info($AuthToken){
$url = "https://www.googleapis.com/oauth2/v1/userinfo";
$fields = array('access_token' => $AuthToken );
$response = _do_get($url, $fields);

//$response = logoutOauthTwoUser($AuthToken);
return $response;
}

function _do_get($url, $fields)
{
$fields_string = "";

foreach ($fields as $key => $value)
{
$fields_string .= $key . "=" . $value . "&";
}
$fields_string = rtrim($fields_string, "&");
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url."?".$fields_string);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPGET, TRUE);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
$response = curl_exec($ch);
curl_close($ch);

return $response;
}

?>
               






                        -- END ---

Invoking from Web application to a JBPM5 process

How to invoke a JBPM process from a Servlet/JSP page?  All the examples talks about the API, but the example expecting is where to mention the HOST, PORT , and the PATH to connect the JBPM Flow?

However If there are two developers one is working on JBPM5 process and deploys to server  A. and nother developer is working on Web application he deploys his web application on server B?

Now how to submit the request (or invokes the JBPM Process) from server B ?

The steps are:

1.  Build your Process in Eclipse.

2.  Register this process with Drools repository  (see how to do it in the Chapter 16 http://docs.jboss.org/jbpm/v5.3/userguide/ch.process-repository.html ).

          (Right click on   your  Evaluation.bpmn process choose  Guvnor and then add   (provide the host and port and authentication credentials.)

3. Now you can browse the to see your deployed process at  bpmn-console  http://localhost:8080/jbpm-console/

4. Also you can see the same process in the govnor  http://localhost:8080/drools-guvnor

5. Invoke the process from the Web application Copy all the process  in some folder say  html-public/jbpmflows/   (you can copy all others flows here)

6. Use the following code with the URL that you can point to the process file as a simple static file

     private static KnowledgeBase readKnowledgeBase() throws Exception {

                    KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();

                    //kbuilder.add(ResourceFactory.newClassPathResource("Evaluation.bpmn"), ResourceType.BPMN2);

                    //kbuilder.add(ResourceFactory.newUrlResource("file:///D:/Evaluation.bpmn"), ResourceType.BPMN2);

                    kbuilder.add(ResourceFactory.newUrlResource(new java.net.URL("http://:8080/webcontextroot/jbpm/Evaluation.bpmn")),         ResourceType.BPMN2);

                    return kbuilder.newKnowledgeBase();

          }

7. submit your flow request to the host system where your flows were registered

      private static StatefulKnowledgeSession createKnowledgeSession(KnowledgeBase kbase) {

                    StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();

                    HornetQHTWorkItemHandler humanTaskHandler = new HornetQHTWorkItemHandler(ksession);

                    humanTaskHandler.setIpAddress("127.0.0.1");  //govnor host

                    humanTaskHandler.setPort(5445); //govnor port

                    ksession.getWorkItemManager().registerWorkItemHandler("Human Task", humanTaskHandler);

                    return ksession;

          }

--More details are welcome.

Deploy SOA 11g components using ANT scripts - REUSABLE CODE

        1.  Download the zip file from   http://sourceforge.net/projects/ant-contrib/files/ant-contrib/1.0b3/ant-contrib-1.0b3-bin.zip/download  and copy the ant-contrib-1.0b3.jar into the  JDEVELOPER/ant/lib  directory.

      2.     Copy the   build.xml, build.properties,   Test_RepairApp_build.properties,  TESTRMASOADEPLOY.bat in the directory where there the  Test_RepairApp workspace folder exist.

     (Create these files using the following content)

3.     Don’t do any changes to the build.xml  file

4.     Change the values in the TESTRMASOADEPLOY.CMD that suites to your system, If required make this as a .sh file accordingly change the paths to support on Unix systems.

5.     In the build.properties change the following things
a.     deployment.plan.environment=dev    (based on the environment change the value)
b.    Change all the paths
                                          i.    wn.bea.home=D:/JDeveloper11115
                                         ii.    java.passed.home=${wn.bea.home}/jdk160_24
                                        iii.    oracle.home=${wn.bea.home}/jdeveloper
                                        iv.    wl_home=${wn.bea.home}/wlserver_10.3
                                         v.    # temp
                                        vi.    tmp.output.dir=D:/temp
                                       vii.    junit.output.dir=junitout
                                      viii.    # my settings 
                                        ix.    applications.home=../myWorkspace

c.     Set the SOA server details
                                          i.    # dev deployment server weblogic
                                         ii.    dev.serverURL=http://localhost:7001
                                        iii.    dev.overwrite=true
                                        iv.    dev.user=weblogic
                                         v.    dev.password=welcome123
                                        vi.    dev.forceDefault=true
                                       vii.    dev.server=localhost
                                      viii.    dev.port=8001

6.     Change the partition name in the from TEST_Rep_Offshore to the required partition in the Test_RepairApp_build.properties  file.

a.     All all the Project names with comma separation
b.    All the properties for each project with projectname prefixed as shown in below example
                                          i.    TEST_Rpr_Inbound_EBS.revision=1.0
                                         ii.    TEST_Rpr_Inbound_EBS.enabled=true
                                        iii.    TEST_Rpr_Inbound_EBS.partition=TEST_Rep_Offshore

7.     Create three configuration plans for each project with _cfgplan.xml

8.     In each projects change the configuration plan xml files with right URL that points to the correspoing environment’s XSD, WSDLs.


Note: Similarly we need to check all other projects. 

    TESTSOADEPLOY .BAT

=====================

set ORACLE_HOME=D:/JDeveloper11115

set ANT_HOME=%ORACLE_HOME%/jdeveloper/ant

set PATH=%ANT_HOME%/bin;%PATH%

set JAVA_HOME=%ORACLE_HOME%/jdk160_24

   

set CURRENT_FOLDER=D:/myWorkspace

D:

CD D:/myWorkspace  

ant -f build.xml deployAll

   build.properties

======================

# demo = true , then no soa scripts will be called.

demo.mode=false

#Vaues are dev, test, or prod

deployment.plan.environment=dev

# global

wn.bea.home=D:/JDeveloper11115

java.passed.home=${wn.bea.home}/jdk160_24

oracle.home=${wn.bea.home}/jdeveloper

wl_home=${wn.bea.home}/wlserver_10.3

# temp

tmp.output.dir=D:/temp

junit.output.dir=junitout

# my settings  

applications.home=../myWorkspace

applications=Test_RepairApp

# my settings

mds.repository=${oracle.home}/integration/seed/apps/

mds.applications=CommonSchemas

#demo applications

#applications.home=workspaces

#applications=wrkspc1,wrkspc2

#demo mds locations 

#mds.repository=mds/seed/apps/

#mds.applications=company,common

#make below properties to true to deploy the MDS applications

mds.enabled=false

mds.undeploy=false

# dev deployment server weblogic

dev.serverURL=http://localhost:7001

dev.overwrite=true

dev.user=weblogic

dev.password=welcome123

dev.forceDefault=true

dev.server=localhost

dev.port=8001

# test deployment server weblogic

test.serverURL=http://localhost.test.com:7001

test.overwrite=true

test.user=weblogic

test.password=welcome123

test.forceDefault=true

test.server=localhost.test.com

test.port=8001

# production deployment server weblogic

prod.serverURL=http://localhost.prod.com:7001

prod.overwrite=true

prod.user=weblogic

prod.password=welcome123

prod.forceDefault=true

prod.server=localhost.prod.com

prod.port=8001

  

   Test_RepairApp_build.properties

=====================================

#Add all the Projects with comma Separate

projects=TEST_Rpr_Inbound_EBS,TEST_Rpr_Inbound,TEST_Rpr_Inbound_EBS_CreateRMaStatus,TEST_Rpr_Inbound_EBS_UpsertRepair,TEST_Rpr_Outbound_MDH,TEST_Rpr_Outbound_ETOS

#Add the revision, enabled, partation for each project

TEST_Rpr_Inbound_EBS.revision=1.0

TEST_Rpr_Inbound_EBS.enabled=true

TEST_Rpr_Inbound_EBS.partition=TEST_Rep_Offshore

TEST_Rpr_Inbound.revision=1.0

TEST_Rpr_Inbound.enabled=true

TEST_Rpr_Inbound.partition=TEST_Rep_Offshore

TEST_Rpr_Inbound_EBS_CreateRMaStatus.revision=1.0

TEST_Rpr_Inbound_EBS_CreateRMaStatus.enabled=true

TEST_Rpr_Inbound_EBS_CreateRMaStatus.partition=TEST_Rep_Offshore

TEST_Rpr_Inbound_EBS_UpsertRepair.revision=1.0

TEST_Rpr_Inbound_EBS_UpsertRepair.enabled=true

TEST_Rpr_Inbound_EBS_UpsertRepair.partition=TEST_Rep_Offshore

TEST_Rpr_Outbound_MDH.revision=1.0

TEST_Rpr_Outbound_MDH.enabled=true

TEST_Rpr_Outbound_MDH.partition=TEST_Rep_Offshore

TEST_Rpr_Outbound_ETOS.revision=1.0

TEST_Rpr_Outbound_ETOS.enabled=true

TEST_Rpr_Outbound_ETOS.partition=TEST_Rep_Offshore

OSB 11g Installation Issues and Resolutions

1. “jdev11g could not extract the archive since it is corrupted error code = 50 “.

This error occurs when we double click the installable exe and your MaAfee antivirus agent is active. So either disabling theagents or by ununstalling the McAfee agent will resolve the issue.

2. If the startWeblogicServer command starts command prompts and closes

Then start the installation in a command prompt and write the log out put to a file by adding ">> mylog.log " at the end of the command lin.

3. "Test Console" service is not running. Contact administrator to start this service.

This error comes because the address is not binded properly. This can be bind properly to one address. This is can be done in the Weblogic Administration Console at a. Home >Summary of Servers >[Your Server]->General->Listen Address
Setting the "Listen Address" explicitly to 127.0.0.1

4. Server is not starting properly and the error log shows like below
javax.transaction.SystemException:weblogic.transaction.loggingresource.LoggingResourceException:java.sql.SQLException: JDBC LLR, table verify failed for table 'WL_LLR_ADMINSERVER', row'JDBC LLR Domain//Server' record had unexpected value 'my_domain2//AdminServer' expected'my_domain//AdminServer'*** ONLY the original domain and server that creates an LLR table may access it ***

This is because we are not using the Derby database for our examples. If we are not working on the examples then we don't need the Derby Database server. So, to resolve this issue, the solution is if you are using the Derby then open config .xml and delete

wlsbjmsrpDataSource
AdminServer
jdbc/wlsbjmsrpDataSource-jdbc.xml


Now you may get error like [ERROR] AdapterManager - ServletContainerAdapter manager not initialized correctly.But the server starts promptly.

{OR}
Alternatively , Execute the following sql statement from SOA_INFRA schema user.

select RECORDSTR from WL_LLR_ADMINSERVER where XIDSTR = 'JDBC LLR Domain//Server';

UPDATE WL_LLR_ADMINSERVER set RECORDSTR = '//AdminServer' where XIDSTR = 'JDBC LLR Domain//Server';
{Note: can be base_domain, or soadomain, based on your domain name provided furing the domain configuration }

COMMIT;

5. OEPE (Eclipse) insists server failed to start (But the Server started well).

This issue is because the OEPE is not properly binded with the server host name. Similar issue like system binding as shown above. The solution is commenting the entry for localhost in the host file with (#) letter as shown below
#127.0.0.1 localhost
{OR}
Alternatively you can check if the Server binding is properly mentioned or not as in the issue No.3

6. If you are not able to shutdown the server from the default configured start up menu item and getting the flowing error
Connecting to t3://KSHAIK-LPT:7001 with userid weblogic ...
This Exception occurred at Fri Dec 10 19:01:26 IST 2010.
javax.naming.CommunicationException [Root exception is java.net.ConnectException
: t3://KSHAIK-LPT:7001: Destination unreachable; nested exception is:
java.net.ConnectException: Connection refused: connect; No available rou
ter to destination]
at weblogic.jndi.internal.ExceptionTranslator.toNamingException(Exceptio
nTranslator.java:40)
at weblogic.jndi.WLInitialContextFactoryDelegate.toNamingException(WLIni
tialContextFactoryDelegate.java:787)
at weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLIni
tialContextFactoryDelegate.java:366)
at weblogic.jndi.Environment.getContext(Environment.java:315)
at weblogic.jndi.Environment.getContext(Environment.java:285)
at weblogic.jndi.WLInitialContextFactory.getInitialContext(WLInitialCont
extFactory.java:117)

Solution, is change the stopWeblogicServer.cmd script
By pointing to set AdminServer host as localhost, If its localhost then try to change it to port 127.0.0.1 or write the mechine name.

7. When we create the OSB and SOA in one domain both in one jvm (one server) then the important thing to remember is After this selection you should see a screen with two servers One managed server for OSB and one managed for SOA.
Since we would like to have both the servers in one managed server (one JVM) we will have to do one important step here. We have to delete either of the servers and rename the other server with deleted server name.eg delete osb_server1 and rename the soa_server1 to osb_server1 or we can also delete soa_server1 and rename the osb_server1 to soa_server1

8. ESB Proxy doesn’t exist error…

The solution is to Make sure that the in OSB Console, all the sessions are activated, no partially activated status. Also, if you are configuring the domain only for OSB along with admin server in single server mode then update the LISTENER HOST with 127.0.0.1. Or if you are installing the admin server and OSB in a managed server along with SOA or without SOA then keep the LISTENER HOST empty for both the admin server and the managed server.

9. [JCATransport:381987]An error occured while validating JCA transport endpoint. JNDI lookup with URL: jca://eis/DB/esrdDatabase failed. Missing JNDI configuration such as undeployed or misconfigured JCA Adapter RAR or connection factory

The actual solution is available in the follow two other blogs, which helped me to resolve the issue
http://guidoschmutz.wordpress.com/2010/08/08/oracle-service-bus-11g-and-db-adapter-a-different-more-integrated-approach/ and

http://tech-learnings.blogspot.com/2009/08/creating-connection-factory-for.html

10. Caused By: java.lang.NoSuchMethodError:
org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar([Lorg/apache/xerces/xni/pa
rser/XMLInputSource;)V
at org.apache.xerces.jaxp.validation.XMLSchemaFactory.newSchema(Unknown Source)
at javax.xml.validation.SchemaFactory.newSchema(SchemaFactory.java:594)
at com.sun.faces.config.DbfFactory.initSchema(DbfFactory.java:151)
at com.sun.faces.config.DbfFactory.(DbfFactory.java:120)
at com.sun.faces.config.ConfigManager$ParseTask.(ConfigManager.java:372)
Truncated. see log file for complete stacktrace

The resolution is , Giving the security permission for Everyone on the Oracle_SOA1 folder and wlserver_10.3 and then Restarted the server. Then it started working well.

11. If the managed server startup command is closing immediately without starting the server then the issue might be passing the user id weblogic and its password in the same command line like below
startManagedWebLogic.cmd osb_server1 http://localhost:7001/ weblogic password

Compensation Handler implementation example.

Here is simple BPEL flow view that gives you an example of how to implement the compensation handler.

See the the following diagram with simple assign and compensation activities along with compansation handler block.

Details:
Compensations consist of 2 parts, the compensation handler, and the compensate activity

•Each scope can have one compensation handler

•A compensation handler defines an undo sequence for the scope it is bound to.

•A compensation handler can be called by a compensate activity

•A compensate activity should be in the outer scope, which calls the inner scope's compensation handler just by specifying its name.

•A compensation handler of the scope belongs to the scope where the exception is thrown will not be executed. Only the previous scope's compensation handlers will be executed successfully upon calling the scope name from outside compansate activity.

•A compensate activity will be used only in the compansate handler or in side the exception blocks of the BPEL process.

Note: In the assign activities use your own assigns with some hard coding strings. Use some string for the if contistion say ( input value = 'MYINPUTSTRING'). Pass this "MYINPUTSTRING" string during the testing process to throw the error.
For more details read here

Enjoy.... provide your comments for any questions.

Thanks...

Khaleel Shaik