Hi all,

I am new to SAP HANA and investigating a solution for our html5 applications.

My question is it is possible for us to deploy SAP HANA Cloud Connector in Internet while it accessing our back-end systems via VPN? 

If yes, any tips or note, especially for "Mapping Virtual To Internal System".

Thanks a lot.

Hello.

I am doing the tutorial Creating an SAP HANA XS Application. In step 8 it says:

Productive SAP HANA instance

1. In the Systems view, expand SecurityUsers and then double-click your user ID.
2. On the Granted Roles tab, choose the + (Add)  button.
3. Select the model_access role in the list and choose OK. The role is now listed on the  Granted Roles tab.

I have done so, but everything in my user is greyed out:

There is also no such role in the list, especially not a model_access role.

How do I get the rights to add a role to my own user?

Thank you in advance,

Robin

How can you ensure secure operations while offering easy cloud access to business data?

The SAP Cloud Identity service simplifies and secures access to your business data, allowing you to control user access based on proven security standards. This comprehensive cloud service provides state-of-the-art authentication mechanisms, secure single sign-on functionality, and on-premise integration.

The SAP Cloud Identity service empowers users to log in just once — from anywhere, on any device — and gain access to all authorized applications.

Spend less time on operations and more on innovation by relying on the SAP Cloud Identity service.

For more information, see SAP Cloud Identity Service

Release Notes for SAP HANA Cloud Platform - 14 August 2014

Release Notes for SAP HANA Cloud Platform - 16 January 2014

Hi,

Trying to setup HCC to connect to ECC for some Fiori trials. Connector state is all green in HCC and below are my settings. But when trying to connect to a service-catalog I get the following error in Web- IDE. Appreciate all help on what's missing

Fig1 is the settings in HANA cloud connector - 'access control'

Fig2 is the settings on HANA Cockpit platform - 'destinations'

cheers,

Ram

Hi Everyone,

     Currently i have one issue when add Hana cloud portal for my SF extension module,  when I try to  access portal through SF instance. It will have cross origin issue.

     Does anyone know how to solve this cross origin issue?  I already config the SSO etc.

Error message like below:

Refused to display 'https://cloudportaltrial-xxxxx.hanatrial.ondemand.com/portal/index.h…cMcvc8y8yMcvcSKbCJbiQSKbC0%2B0%2B1px%2B0!1!Y1WvH!%2F.dcss%3Bmod%3D152a71e1' in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'.

Best Regards,

Chris.Bai

I posted a question a few days ago and got no response but I've continued to research it and have learned a little more but it raises a fundamental question.

I'm attempting to create a destination in HCP but have run into some issues and I'm having trouble understanding how this works.  I'm hoping someone can clear it up for me.  I've created services on our HANA system and in NWG.  I can access both successfully using a REST client through the internet.  When I create a destination in the HCP Cockpit or connection in SMP cloud I configure it using Internet as opposed to OnPremise because I'm able to access via the Internet.  However, when I test it, I get a 403 or Target Service Not Allowed error.  According to the SMP documentation, this means that the service should be configured as OnPremise.  This is confusing.  What is the criteria for requiring an OnPremise connection?  My understanding was that it was required when a service could not be accessed directly via the Internet.

If anyone can clear it up for me, I would greatly appreciate it.

Ross

In the second blog post of this blog post series around Raspberry Pi and the SAP HANA Cloud Platform we've taken care of the receiving part in the cloud. If you've followed the instructions in the blog post you have now an app running on your free developer account which can receive sensor data and persist it and provide some output in JSON format for the user interface.

In this blog post we'll now look into the code for the Raspberry Pi and will connect an external temperature sensor to our Raspberry Pi. That code will be sending the temperature data from the CPU inside the Raspberry Pi as well as the temperature from the external temperature sensor.

Table of Contents

But first thing first. Let's first tackle some hardware challenges.

Connecting the external sensor

This is the part where you need to have solding skills (or know somebody who has). Follow the instructions on this blog under the section "

Step Two: Connecting the Temperature Sensor" and connect your sensor to your Raspberry Pi.

CAUTION:

Please be aware that this is hardware-stuff which actually can react in a physical way like getting hot, explode, burn you, etc.. So you either know what you are doing, find someone who can do it, buy it somewhere ready-made or just leave it. You do this at your own risk (which you've probably know before anyways, but just mentioning it here, so you don't forget while reading :-)

The Java app for the Raspberry Pi

You can find the code for your Raspberry Pi in the file I've attached to this blog post.

Just unzip it on your machine and open a console to connect to your Raspberry Pi like I've described in my first blog post of this series.

After logging-in to your Raspberry Pi change the current directory to the folder you've created for your scripts. If you did it, like I've done it, you'll switch to your myscripts folder.

cd /home/pi/myscripts

The next thing we do is to create the app on the Rasperry Pi. To create the corresponding Java file we create a file called Temperature.java with the text editor nano.

nano Temperature.java

Your window should look more or less like this:

Now copy the content of the file you've extracted before on your machine into your clipboard. Switch back to the console with the opened nano editor and paste the clipboard into the window.

Now press the command and X key and the editor will ask you to either press Y to save the file or N for not doing it. Press Y and hit the return key to save the file.

Before you can move forward you need to adapt the code so it works with your account. So let's open the Temperature.java file again in nano

nano Temperature.java

Check proxy

First thing you need to do is adapt the USEPROXY variable in the Temperature.java file. Set it to false if you are working from home, as most probable you don't use a proxy server at home. If you do have a proxy server for accessing the internet, set it to true.

Adapt URL of Java app on your SAP HANA Cloud Platform account

Now look into the variable called SERVLET_URL_cloud and change it to the URL of your application that you've deployed in the second blog post of this series.

Get Hardware ID of the external temperature sensor (optional)

In case you want to use the values of the external temperature sensor, you need to find out it's ID before. To do that you should ensure you've added the modules for the sensors as described in the first blog post and also connect the sensor to the Raspberry Pi as described above.

Now move to the folder /sys/bus/w1/devices/ and search for a subfolder there called 28-xxxxxxxxxxx. That folder name is the id of your sensor.

ls /sys/bus/w1/devices/

If you don't get any results or an error message saying "No such file or directory" you've either not connected the external sensor, or you've connected it wrongly to your Raspberry Pi.

Once you have the id of your sensor you need to assign it to the variable called SENSOR_HARDWARE_ID in your Temperature.java file.

Assign DB id's of sensors to the ones on your Raspberry Pi

In the past blog post you've already created at least one sensor in your database. What you need to do now is to get the database ids for 2 sensors. So if you haven't done, yet, create at least two sensors in your app like described in the past blog post.

If you call your app you should see something like this

Take the number after the "id" field and assign them in your code to the variables SENSOR_DB_ID_CPU_TEMP and SENSOR_DB_ID_TEMP_SENSOR.

Compile the Temperature.java file

After doing all the changes you need to save the file in nano. Now you need to compile the file. To do that enter this command in your myscript folder:

javac Temperature.java

Should you get an error message you might have messed-up the code. Try again :-)

If there are no errormessages a new file was created called Temperature.class. Check it by listing up the files in your myscript folder:

ls -l

Send your sensor data to your app on SAP HANA Cloud Platform

The last thing missing now is to actually run the app. To do it simply we call the Java app like this

java Temperature 10

The 10 at the end tells the app that it should iterate through the app 10 times.

If everything worked fine you should now be able to see the sent sensor data in your Java app on your account.

Next Steps

Now that we have worked on the hardware side of this, we'll work on the user interface to provide a nice looking dashboard for Rui's Fish Import/Export Inc..

That's what we'll do in the next blog post.

Have fun.

Best,

Rui

When thinking about the SAP HANA Cloud Platform there are some things you'd not immediately connect to it. One is certainly a Raspberry Pi.

The Raspberry Pi is a low-cost credit-card-size computer with an ARM-processor that has a huge community and since today more than . It costs around 35 Euro and runs on special Linux versions like e.g. Raspian (adapted Debian Linux). Produced for the first time in 2012 by the end of 2013 already more than 2 million devices were sold!

Along with one HDMI, one Ethernet, and two USB ports the RaspberryPi has also digital input pins. Meanwhile there is even a new revision B+ available providing 4 USB ports and some more improvements. Meaning you can connect digital sensors to it or, via an analog-to-digital convert, or analog sensors. With the low price and these connectivity features it's the ideal candidate to run internet-of-things scenarios on it.

That's the reason why I thought: why not letting the Raspberry Pi send sensor data to an account on the SAP HANA Cloud Platform? And that's why I've setup this blog post series around this topic.

In the next weeks and months I'll keep on adding additional blog posts to this series so that you can see you to use your Raspberry Pi for internet-of-things scenarios.

And maybe you get inspired and think of other scenarios where you need sensor data in your SAP HANA Cloud Platform account to bring the internet-of-things into the products and services of your company.

Currently these are the blog posts I'm planning to release in a monthly or bi-weekly cycle:

• Part 1: Setting-up your Raspberry Pi
• Part 2: Receiving the sensor values in the cloud
• Part 3: Sending sensor data from RaspberryPi to your cloud-app
• Part 4: Create an SAPUI5 dashboard
• Part 5: Add additional virtual sensors to your dashboard
• Part 6: Local persistence using SQL Anywhere
• Part 7: Synchronizing the data with MobiLink
• Part 8: Getting productive

Best,

Rui

Hi All,

I've created a trial account and I'm trying to expose a table using an oData service (xsodata file).

The service is created correctly, since when running https://...myhanaxs/tweet.xsodata and https://...myhanaxs/tweet.xsodata/$metadata I'm able to see the corresponding pages.

The problem is that, when I try to GET from the service, I receive the following error message:

<exception>

exception  1: no.71000258  (ptime/query/checker/query_check.cc:2547)    Not authorizedNO exception throw location recorded. Stack generation suppressed.

</exception>

I've tried to create my table in both schemas (the one starting with DEV_ and the other starting with NEO_) but both tables, when referenced by the xsodata file result in the same error.

Do you know what is missing?

Thanks and regards,

Roberto Falk

The HANA Cloud Platform trial account is free of charge. This is possible because multiple developers work on the same databases in parallel. For that reason, additional safety measures have been implemented. This makes the application development quite tricky sometimes. A couple of weeks ago I developed an SAPUI5 application using my HANA Cloud Platform trial account. When I wanted to receive data from the database, it was not working. The process of figuring out the problem and solving it took quite some time but I came up with a solution. Jamie Wiseman from the SAP HANA Academy team encouraged me to explain my solution in the SCN, so that’s what I am going to do

The issue

My SAPUI5 Application accesses a database table containing Geodata. The standard way of doing this in SAP HANA is creating and using an ODATA service. Creating an ODATA service in SAP HANA is very easy: You simply need to create another file (file extension .odata) in your XS or SAPUI5 package and insert something like:

service {
"SCHEMA"."TABLE" as "Geodata" keys generate local "GENERATED_ID";
}

At first you of course should test the ODATA interface. You can do this by just calling it in your browser. The URL is like:

https://s1hanaxs.hanatrial.ondemand.com/path/to/your/package/odataservice.xsodata/servicename?json&$select=COLUMN,COLUMN,…

Be careful when you test your service. When I did it on my laptop, I had no problems. My SAPUI5 app however seemed to be unable to access data. Using a different browser, I finally understood the issue: Normally, I have to logon with my S-User first.

    ODATA access will trigger S-USER Logon process

The other browser had the SAP Certificates for automated logon installed, so testing with it had always worked. This by the way also applies to the SAPUI5 application itself. If you want to be able to access it without logging on with your S-User, it does not work out of the box.

First problems

At first, I looked at the settings for authentication in the SAP HANA Cloud Platform Cockpit (Trust). Unfortunately, your only alternative to the authentication via S-User is setting up a connection to another trusted identity provider. I am no expert on this, but I guess it would be a lot of work and at the end also require some sort of authentication which is not supported by a standard SAPUI5 application. So this approach is a dead end.

My second try was using SQLCC which is described very well in a video from the SAP HANA Academy. For this approach, your database user needs certain privileges (role sap.hana.xs.admin.roles::SQLCCAdministrator). These privileges could be used to basically become administrator if you use them right. As the trial instances (just the trial instances) of the HANA Cloud Platform are used by multiple developers in parallel, they don’t have these privileges. Another dead end.

Anonymous access to SAPUI5 application

My first step to success was a thread on saphana.com with a solution for anonymous access very similar to the full SQLCC approach. It uses the .xsaccess file in the project. HANA development projects including ODATA services or SAPUI5 applications always need two files to work: “.xsapp” and “.xsaccess”

.xsaccess – as the name says – can contain options for the accessing the application. To enable anonymous access, you have to adjust your file like this:

{
"anonymous_connection": "path.to.your.package::anonuser",
"authentication" : null,
"exposed": true
}

Then you have to create a database user using XS development. You can this by creating a file with the name “username.xssqlcc”. I used the name “anonuser” in .xsaccess, so the filename has to be “anonuser.xssqlcc”. There is not a lot of content, but you can insert a description. Just remember To have brackets in the file:

{
"description" : "Anon SQL connection"
}

Now you can access your development projects in this package without having to authenticate with your S-User. It works fine for the SAPUI5 applications. However, access to the database is still not possible. If you try to access the ODATA service like I described, you will no longer see a logon screen. Instead you won’t see anything. By using the development tools of your browser, you can examine the response from the server and see something like this:

   Accessing with an anonymous database user does not work for ODATA

Error 500 makes it clear: Using ODATA services anonymously does not work in the HANA Cloud Platform. So I found a different solution. (However: If someone knows a solution for ODATA, please tell me in the comments )

Anonymous access to SAP HANA

My next idea was to develop a database interface like odata on my own. As I was already using an XS application project in the HANA Cloud Platform, I tried to do it with XS. Remember that you have to enable anonymous access to the XS application itself before an SAPUI5 application would be able to use it. If you want to access the database out of XS, you do something like:

var conn = $.db.getConnection();
var pstmt = conn.prepareStatement( "select * from NEO_ET72UJMG1CL4IUODE1NJVKJ1O.ADACALL" );
var rs = pstmt.executeQuery();

The problem with that is the first statement. It will not work if you call it using anonymous access. Instead you will get an error code 500 like you did with ODATA. The only way around this is using SQLCC, which is not possible with an SAP HANA Cloud Platform trial account (see “First problems”).

The key to success is the JAVA development in the SAP HANA Cloud Platform. If you access the database out of a JAVA application, it does not require any authentication. This is even the default setting. Using JAVA, you can easily write a little webservice that transfers the data you need to the SAPUI5 application.

A little issue remains: I wanted to be able to create HANA Views on top of my tables. It is important to understand that the standard database schemas of JAVA and XS applications are fundamentally different. The first sign for that are different database versions:

   XS and JAVA Schemas are located on different databases

That means you not only have different schemas but actually different databases. Therefore it is not possible to access a table in a JAVA schema out of an XS application using a XS schema. Also, you have far more privileges in the XS schema. The most important one is the privilege to create packages and develop XS and SAPUI5 applications as well as HANA Views in them.

To combine the benefits of anonymous database access and HANA Views as well as XS development, I simply changed the schema binding of my JAVA webservice to the XS schema.

   Changing the schema binding combines the benefit of JAVA and XS in the HCP

You can change the schema binding of your JAVA application in the HANA Cloud Platform Cockpit. In the menu on the left side, select "JAVA Applications" and then select your application. On the left side, click on "Schmema Bindings". Now delete the old schema binding and create a new binding to your XS schema.

As far as I can tell, there is no benefit from using the JAVA schema over the XS schema (again, please correct me if I’m, wrong). Of course you can also establish multiple bindings for one application if you like.

I hope I could help some of you to understand how anonymous access works. Please keep in mind that this issue only exists in the trial account. And please give me some feedback if you like

Many of you may have noticed a gap in the documentation of Hana Cloud Platform development. There is a description of UI5 and how to build nice UIs with this HTML5 technology. And there is a description of how to build backend java based applications which starts with servlet technology?! Wouldn't it be nice to have UI5 and let it communicate with the Java backend and not to build servlets anymore?

In fact if HCP would support Java EE 7 Web Profile instead of version 6 you would get JAX-RS support out of the box and can use the JSONModel in UI5 to communicate with your HCP backend. With version 6 you can still use JAX-RS but you have to include it yourself in your application.

I want to describe here as an overview whats need to get this done. As normal you need a dynamic Web project in your Eclipse as a start point. I have successfully used Jersey/Jackson as the implementation of the JAX-RS 2.0 standard. If you have a maven project inlude the dependencies as described on Jersey project page. If you don't use maven just include the libs in WebContent/WEB-INF/lib as you would normally do.

So what do you need for JAX-RS to work for you? Lets assume you want to create one service class which responds to a HTTP GET on the relative path "/rest/ping" where "rest" shall be the path of all rest based calls and ping the specific part.

So you have to do some work in your web.xml first:

  <servlet>
    <servlet-name>com.sap.myapp.MyApplication</servlet-name>
    <init-param>
      <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
      <param-value>true</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>com.sap.myapp.MyApplication</servlet-name>
    <url-pattern>/rest/*</url-pattern>
  </servlet-mapping>
 

This defines a special servlet that you have to write later on and defines that all your REST based services are reachable under the path of "/rest/*" as we wanted to do.

So lets create the class com.sap.myapp.MyApplication which has to extend javax.ws.rs.core.Application, a standard class of JAX-RS. It should look like the following:

package com.sap.coe.hr.sf.par.rest;
 
import java.util.HashSet;
import java.util.Set;
 
import javax.ws.rs.core.Application;

/**
* JAX-RS Application
*/
public class PARApplication extends Application {

  public Set<Class<?>> getClasses() {

    Set<Class<?>> s = new HashSet<Class<?>>();
    s.add(PingService.class);
    return s;
  }
}
 

Here you have to add EVERY service class you write. Normally you would divide your services in several classes. We now have to write the PingService thats added there.

/**
 * REST
 */
package com.sap.myapp;
 
import javax.servlet.ServletException;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
 
/**
 * JAX-RS Service for ping
 */
@Path("/ping")
public class PingService {
  @GET
  @Path("/")
  @Produces(MediaType.TEXT_PLAIN)
  public Response ping() throws ServletException {
    return Response.ok().entity("pong").build();
  }
}
 

So this service listens on everything on the relative path "/ping". Together with the declaration in web.xml the relative path is now: /rest/ping/*

It has one method that is called on a HTTP GET request and it produces plain text. Normally you would produce JSON but thats something I will keep for part two. Just a hint in the return you can add any object in the entity call instead of a static string that gets transformed to JSON automatically!

Thats it you created your first REST service.

Hi Experts,

I am trying to run SAP HANA Cloud Connector on Windows 8.1 machine , i could see the go.bat command response as below:

But when i run https://localhost:8443 URL in a browser, i don't see any response. Just a blank screen.

By looking at the logs:

#ERROR#com.sap.scc.jni#Start Level Event Dispatcher#  #Cannot load the Cloud Connector native library. (exception java.lang.UnsatisfiedLinkError: no sapscc20jni in java.library.path)

As per this reference https://help.hana.ondemand.com/help/frameset.htm?204aaad4270245f3baa0c57c8ab1dd60.htmlInstallation on Microsoft Windows OS it doesn't talk anything about support of HCC on Windows 8.1, just wondering if above error is because of it.

For more details, PFA log files.

Regards,

JK

Hello everyone!

I have xs-application and 2 HANA systems, for example, hana1 and hana2.

XS-application based on hana1, but I want also use data from hana2.

Is it possible?

I was trying to call xsjs from hana2, but it was unsuccessful.

Thanks!

Hi,

has anyone managed to bring those pieces together?

What I have running are some REST based Services with Jersey 1.18 but no EJB Injection seems to work.

@Path("/user")
public class UserService {
  @EJB
  PDBInterface pdbBean;
  @POST
  @Produces("application/json")
  @Consumes("application/json")
  @Path("/json")
  public Response modifyJson(JsonBean input) {
    if (pdbBean != null) {
      input.setVal2(pdbBean.getUser("11"));
    }
    else {
      input.setVal2("pdb not injected");
    }
    return Response.ok().entity(input).build();
  }
}

This service I can call but the Bean "pdbBean" is always null, so nothing gets injected.

I also tried to use the EJB directly as Rest Service class:

@Stateless
@LocalBean
@Path("/ejb")
public class PDBInterface {
  @PersistenceContext
  EntityManager em;
  @GET
  @Path("/echo")
  @Produces("text/plain")
  public String getUser(String userId) {
    if (em != null) {
      return "em here";
    }
    else {
      return "em not here";
   }
  }
}

Again no em is injected...

Anyone managed to get something like this running?

Frank

Hello.

Being a newbie, apologies if the question is naive.

I have been working locally on my laptop building a simple SAPUI5 app (simple master/detail app with a json feed coming from an external url).

The external url that provides the JSON feed is done through a php script. I can control because it is served from a site I own. I have been able to resolve the cross domain issues and locally (on my laptop) can run the app successfully without needing to be in - disabe security - mode.

I invoke the json feed in my app as below:

// Using a local model for offline development

  var oModel = new sap.ui.model.json.JSONModel("http://link.to.my domain/script.php");

  oView.setModel(oModel);

Using this php script, again locally it all works. However when I push it to the SAPHCP, it no longer works.

I have tried to replace the json feed with a local file, and that works OK.

Is there something I need to do to be able t consume that external feed?

Any information is greatly appreciated.

Thanks

Hi Guys,

I state that are very newbie on SAP HANA.

I'm using SAP HANA Trial and trying to connect from SAP HANA to googe maps as described on tutorial "https://help.hana.ondemand.com/help/frameset.htm?a238abbe7bb141f1a66143da94697b95.html" but I'm not able to launch the application. When I indicate the full path into the browser "https://s6hanaxs.hanatrial.ondemand.com/pxxxxxxxtrial/myinst/hello2/connectivity/google_test.xsjs"  I receive the message

"User is not authorized to use destination (package: connectivity.mapinfo, name: google)".

Can someone help me Please

Within the application I've create the subpackage "connectivity" that contains two files:

file: google.xshttpdest

host = "maps.googleapis.com";

port = 80;

pathPrefix = "/maps/api/distancematrix/json";

useProxy = true;

proxyHost = "proxy-trial";

proxyPort = 8080;

authType = none;

useSSL = false;

timeout = 30000;

File: google_test.xsjs:

var destination_package = "connectivity.mapinfo";

var destination_name = "google";

try {

  var dest = $.net.http.readDestination(destination_package, destination_name);

  var client = new $.net.http.Client();

  var req = new $.web.WebRequest($.net.http.GET, "?origins=Frankfurt&destinations=Cologne&mode=driving&language=en-US&sensor=false");

  client.request(req, dest);

  var response = client.getResponse();

  $.response.contentType = "application/json";

  $.response.setBody(response.body.asString());

  $.response.status = $.net.http.OK;

  }

catch (e) {

  $.response.contentType = "text/plain";

  $.response.setBody(e.message);

  }

Hi,

I'm new to HANA Mobile developments.

Through the SAP guides, i have learnt some basics of HANA mobile development and implemented few sample apps too.

Now, I just want to try the same in our own Landscape which is Cloud Platform.

But we dont have a clue, how to configure HANA cockpit?

In all sap samples we have used HANA cockpit to create instance and manage SAPUI5 apps etc. So it seems HANA cockpit is mandatory for mobile developments. But not sure.

Is Cockpit is Mandatory for Mobile developments ?

If not mandatory, how to create instances, create apps and view app url etc... ?

If its mandatory, then how to install or configure HANA cockpit in our Cloud Landscape ?

Thanks in Advance.

Regards

Yokesvaran Kumarasamy

This is part 2 of this blog and it assumes you have read Part 1.

In part 1 of this blog we have achieved a basic "ping" service that responds to a get request with just some static answer - "pong".

Normally you want to access a database and do some nice stuff. The best way to achieve a nice service layer is (in my opinion) to use EJB. You can control access rights, transactions etc. right by annotating your EJB in a nice and simple way. And you get your EntityManager or Datasource for JPA or JDBC directly injected without so much "boiler plate" code. So I want to show how to incopreate EJB in our setup. So the task I want to solve is adding an EJB with an entity manager injected and returning the result as a JSON object.

So first turn your project to a JPA project by adding this project facet in Eclipse.

Then we need a simple EJB:

/**
* EJB
*/
package com.sap.myapp;
 
import javax.ejb.LocalBean;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
 
/**
* Simple EJB
*/
@LocalBean
@Stateless
public class MyEJB {
 
  @PersistenceContext EntityManager em;
 
  public MyJSONResult doSomething() {
    MyJSONResult result = new MyJSONResult();
    result.setState(em != null ? "em is injected :-)" : " em not inject :-(");
    return result;
  }
}

It does nothing else as to give me the state of the injected entity manager. For the sake of completeness I have to add the MyJSONResult class, which is just a simple POJO:

/**
* JSON bean
*/
package com.sap.myapp;
 
/**
* Simple Bean as result of EJB call
*/
public class MyJSONResult {
  private String state;
 
  /**
   * @return the state
   */
  public String getState() {
    return state;
  }
 
  /**
   * @param state the state to set
   */
  public void setState(String state) {
    this.state = state;
  }
}

If we would have the Java Web Profile level 7 not 6 on HCP this would be very easy (and I could not write this blog) all you would have to do is add your EJB to your new service. So my service would look like:

/**
* REST
*/
package com.sap.myapp;
 
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
 
/**
* Simple REST Service
*/
@Path("/service")
public class MyService {
 
  @EJB MyEJB myEjb;
 
  @GET
  @Path("/")
  @Produces(MediaType.APPLICATION_JSON)
  public Response myService() throws ServletException {
    return Response.ok().entity(myEjb.doSomething()).build();
  }
}

This would result in a Nullpointer Exception as the EJB is not injected. So there is some more magic needed as long as we stay with Jave Web Profile 6. We have to do a JNDI lookup of the bean before we can use it. By doing JNDI we get a fully working container managed EJB and we have to do that in every service method that wants to use EJB.

So the extended service will look like the following:

/**
* REST
*/
package com.sap.myapp;
 
import javax.ejb.EJB;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
 
/**
* Simple REST Service
*/
@Path("/service")
public class MyService {
 
  @EJB MyEJB myEjb;
 
  @GET
  @Path("/")
  @Produces(MediaType.APPLICATION_JSON)
  public Response ping() throws ServletException {
    lookupEJBs();
 
    return Response.ok().entity(myEjb.doSomething()).build();
  }
 
  private void lookupEJBs() throws ServletException {
    if (myEjb == null) {
      try {
        InitialContext ic = new InitialContext();
        myEjb = (MyEJB) ic.lookup("java:comp/env/ejb/MyEJB");
      }
      catch (NamingException e) {
        throw new ServletException(e);
      }
      catch (Exception e) {
        throw new ServletException(e);
      }
    }
  }
}

For the JNDI lookup to work you have to add your EJB to the web.xml:

  <ejb-local-ref>
    <ejb-ref-name>ejb/MyEJB</ejb-ref-name>
    <local>com.sap.myapp.MyEJB</local>
  </ejb-local-ref>

So you tried it all out and your ping-pong service works but your new service gives a 404? Then you forgot to add your new service class to "MyApplication" as we did with the PingService in Part 1

Thats it, if you call now your application with the relative path "/rest/service" you get a JSON response.

{"state":"em is injected :-)"}

Explore the power of Jersey, even stuff as file upload can be done with a few simple annotations. If someone is interested in that I may add a third part to this small blog series

Hi all,

I am trying to get the list of accounts associated with particular sales person from c4c CRM. I am trying to sort it out using odata web service API's. The standard APIs bring back huge list of account(all of them) . I want to filter the result based on ownerId,but that property is not filter enabled. Can anybody suggest solution to my problem. Is it possible for us to enable filtering properties or is there any other way out?

Thanks,

Surya