Welcome!

IBM Cloud Authors: Pat Romanski, Liz McMillan, Yeshim Deniz, Carmen Gonzalez, Elizabeth White

Related Topics: IBM Cloud, Java IoT, Mobile IoT

IBM Cloud: Article

How to Create a Simple Java J2ME Application for BlackBerry

With WebSphere Studio Device Developer

Having employees constantly connected to one's enterprise is vital to many companies. This is one of the reasons Research in Motion's BlackBerry has mustered a massive following (over three million users at the time of this article's writing) in recent years. BlackBerry addiction has become pandemic. In this article, you'll learn how to build, test, and deploy applications to Blackberry devices using WebSphere Studio Developer.

WebSphere Studio Device Developer (hereafter called Device Developer) provides you with an integrated development environment (IDE) in which you can build, test, and deploy J2ME applications.

For learning purposes, the sample MIDlet application you'll create following the steps in this article is pretty simple: it takes input text from a user, transposes the text, then displays the transposed text to the user. For example, if a user enters the text IBM, the transposed, or mirrored, text MBI is returned.

Prerequisites
The BlackBerry Java development environment (JDE), which runs only on Windows operating systems, consists of an IDE and BlackBerry emulator tools that let you see exactly how the J2ME application you build will work on a BlackBerry device. In this article, we'll use the Device Developer IDE rather than the IDE that ships with the BlackBerry JDE. However, you still need to download and install the BlackBerry JDE in order to use the BlackBerry emulation environment. This way, you can see how your J2ME application will act on the actual BlackBerry device. See Resources for information on downloading the BlackBerry JDE.

You also need to have the following software installed:

  • Java 2 SDK, Standard Edition V5.0
  • WebSphere Studio Device Developer. Device Developer is part of the IBM WorkSpace Client Technology, Micro Edition 5.7 Integrated Package. Check out Resources for information on downloading a trial version of Device Developer.
You should have a basic knowledge of Eclipse and the BlackBerry JDE.

Create the application
First, we need to create our MIDlet application using Device Developer. We'll put our MIDlet in a MIDlet suite.

1.  Create a new MIDlet Suite project, then click Next, as shown in Figure 1:

2.  On the MIDlet Suite Creation screen, do the following:

  1. Enter MirrorMidlet for the MIDlet name.
  2. In the Midlet Suite Name field, type MirrorMidletSuite.
  3. Select 2.0 for the MIDP Version.
  4. Enter Mirror Midlet
  5. Enter a MIDlet class Package of com.ibm.test and a Name of MirrorMidlet, then click Next.
Figure 2. Create MIDlet Suite

3.  Select the default J9 JVM ive-2.2, and click Finish.

Figure 3. Select JVM

4.  The MIDP Visual Editor is launched. Since we won't be using the visual editor in this article, you can go ahead and close it.

5.  At this point our MIDlet is pretty barebones. We need to edit it to make it perform the transposition function described earlier. To do this, right-click MirrorMidlet.java and select Open with => Java Editor.

6.  Replace the existing class definition with the following:

public class MirrorMidlet extends MIDlet implements
CommandListener
      {protected Form form;
      protected TextField input = new
TextField("String:", null, 128, TextField.ANY);
      Command commandConvert = new Command("Convert", Command.OK, 1);

7.  Add the following to protected void startApp():

// Init form
form.append(input);
form.addCommand(commandConvert);
form.setCommandListener(this);

8.  Add the following method:

public void commandAction(Command aCommand, Displayable aDisplayable)
{ if (aCommand == commandConvert){char aChar;
      int size = input.size();
      char[] charArray = new char[size];

      // determine inverse
      input.getChars(charArray);
      for (int i = 0; i < size / 2; i++){aChar = charArray[i];
      charArray[i] = charArray[size-1-i];
      charArray[size-1-i] = aChar;
    }

      // update screen
      input.setChars(charArray, 0, size);
    }
}

9.  The code above implements the transposition function. The core of the transposition logic lies in the if clause of the commandAction method, which simply transposes the letters of an input character array using a for loop.

10.  Now build the project by right-clicking on the MirrorMidlet project and selecting Build Project.

Create the Java Application Descriptor (JAD) and JAR files
Now that the code is complete, you need to create a JAR file and associated JAD file for deploying to the J2ME device. To do this, you need to set up a build by completing the following steps:

  1. Right-click on the MirrorMidlet project and select Device Developer Builds.
  2. . Select Add to create a new build.
  3. Click Next on the Create generic JAR window. (Figure 4)
  4. Select Generic JAR in the Create new build window, and click Finish. (Figure 5)
  5. In the Configure Builds window, select Run to build the JAD and JAR files, which are located in the generic/folder. (Figure 6)
  6. Optional: If you have any images or other resources associated with your project, complete the following steps to include them:
    1. Edit generic/MirrorMidletSuite.jexlinkOptions, and select the Source tab.
    2. Add the location of the folder containing the additional resources using -cp.
    3. To include the resources specify includeResource "*.xxx" (for example, *.png), as shown in Figure 7.
Debug the application
Before deploying the application to your BlackBerry, you can use the Device Developer IDE's built-in debugger to debug your J2ME application by completing the following steps:
  1. Set a breakpoint within the project, as shown in Figure 8:
  2. Select Run => Debug, then select MirrorMidlet Suite, then New to create a new debug profile.
  3. Select the default JRE of ive-2.2 and MirrorMidletSuite.jad.
  4. Click Debug to begin debugging your MIDlet. (Figure 9)
Deploy the application
You now have a JAR file that is ready to be deployed to a J2ME device. Unfortunately, we can't just deploy this JAR file to a BlackBerry. First, we have to convert the JAR file to the BlackBerry .cod format. To do this, complete the steps below:
  1. Create a jartocod.bat file to use with the Blackberry JDE, as shown:

    @ECHO "Syntax: jartocod.bat JAD_NAME JAR_NAME OUTPUT_NAME"
    :RUN
    @"C:\Program Files\Research In Motion\BlackBerry JDE 4.1.0\bin\rapc
    "import="C:\Program Files\Research In Motion\BlackBerry JDE
    4.1.0\lib\net_rim_api.jar" codename=%3 -midlet jad=%1 %2


  2. Copy the JAD and JAR files you created earlier from the generic/ folder to the location of the jartocod.bat.
  3. Type the command: jartocod.bat MirrorMidletSuite.jad MirrorMidletSuite.jar MirrorMidlet.
Now you have a .cod file that the BlackBerry can understand.

Deploy to the BlackBerry simulator

  1. Launch the BlackBerry Device Simulator by selecting Start => Research In Motion => BlackBerry JDE => Device Simulator.
  2. Once the simulator is loaded, install the .cod file by selecting File => Load Java Program. (Figure 10)
  3. Navigate to the directory containing your .cod file and open the file. (Figure 11)
  4. Locate the icon on the BlackBerry Simulator desktop and launch it. Hint: The up and down arrows function as Select and Back emulated BlackBerry buttons. (Figure 12)
  5. Select the Transpose function from the context menu to see the Mirror MIDlet work on the BlackBerry simulator. (Figure 13)
Deploy to a Real BlackBerry
Deploying your .cod file to a real BlackBerry device is a pretty simple operation:
  1. First, create an installcod.bat file to use with the Blackberry JDE, as shown below:

    @ECHO "Syntax: installcod.bat COD_NAME.cod"

    :RUN
    @"C:\Program Files\Research In Motion\BlackBerry JDE
    4.1.0\bin\javaloader" -u load %1


  2. Next, plug your BlackBerry device into your computer using a USB cable and execute the installcod.bat batch file to install the MIDlet onto the BlackBerry device.
Conclusion
In this article, you learned how to use the power of IBM WebSphere Device Developer to build and test J2ME applications and then deploy them to the BlackBerry platform. The J2ME application we created in this article didn't need to interact across the network to perform its function. In our next article, we'll show you how to create a more complex BlackBerry application using Device Developer that involves invoking of a Web service on WebSphere Application Server.

(This article appeared originally online at IBM Developer Works.)

More Stories By Kulvir Singh Bhogal

Kulvir Singh Bhogal works as an IBM Software Services for WebSphere consultant, devising and implementing WebSphere-centric solutions at customer sites across the nation. He has over fifty patents pending in a myriad of technology areas. He can be reached at kbhogal@us.ibm.com

More Stories By Michael Masterson

Michael Masterson is a results driven technology executive with 12 years of experience in Social, Mobile, and Enterprise Software. He currently leads business development and strategy for Compuware APM with a focus on Big Data and Cloud. Previously he held product management, strategy, and engineering roles at IBM. He has a passion for product, perseverance to build channel ecosystems, and focuses on execution. Reach him at @mlmasterson

Comments (6) View Comments

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


Most Recent Comments
WebSphere News Desk 04/18/06 02:25:26 PM EDT

Having employees constantly connected to one's enterprise is vital to many companies. This is one of the reasons Research in Motion's BlackBerry has mustered a massive following (over three million users at the time of this article's writing) in recent years. BlackBerry addiction has become pandemic. In this article, you'll learn how to build, test, and deploy applications to Blackberry devices using WebSphere Studio Developer.

SYS-CON Italy News Desk 04/18/06 01:25:19 PM EDT

Having employees constantly connected to one's enterprise is vital to many companies. This is one of the reasons Research in Motion's BlackBerry has mustered a massive following (over three million users at the time of this article's writing) in recent years. BlackBerry addiction has become pandemic. In this article, you'll learn how to build, test, and deploy applications to Blackberry devices using WebSphere Studio Developer.

SYS-CON Brasil News Desk 04/18/06 11:47:20 AM EDT

Having employees constantly connected to one's enterprise is vital to many companies. This is one of the reasons Research in Motion's BlackBerry has mustered a massive following (over three million users at the time of this article's writing) in recent years. BlackBerry addiction has become pandemic. In this article, you'll learn how to build, test, and deploy applications to Blackberry devices using WebSphere Studio Developer.

SYS-CON Australia News Desk 04/17/06 06:00:22 PM EDT

Having employees constantly connected to one's enterprise is vital to many companies. This is one of the reasons Research in Motion's BlackBerry has mustered a massive following (over three million users at the time of this article's writing) in recent years. BlackBerry addiction has become pandemic. In this article, you'll learn how to build, test, and deploy applications to Blackberry devices using WebSphere Studio Developer.

SYS-CON Brasil News Desk 04/17/06 12:46:30 PM EDT

Having employees constantly connected to one's enterprise is vital to many companies. This is one of the reasons Research in Motion's BlackBerry has mustered a massive following (over three million users at the time of this article's writing) in recent years. BlackBerry addiction has become pandemic. In this article, you'll learn how to build, test, and deploy applications to Blackberry devices using WebSphere Studio Developer.

SYS-CON India News Desk 04/17/06 11:58:12 AM EDT

Having employees constantly connected to one's enterprise is vital to many companies. This is one of the reasons Research in Motion's BlackBerry has mustered a massive following (over three million users at the time of this article's writing) in recent years. BlackBerry addiction has become pandemic. In this article, you'll learn how to build, test, and deploy applications to Blackberry devices using WebSphere Studio Developer.

@ThingsExpo Stories
BnkToTheFuture.com is the largest online investment platform for investing in FinTech, Bitcoin and Blockchain companies. We believe the future of finance looks very different from the past and we aim to invest and provide trading opportunities for qualifying investors that want to build a portfolio in the sector in compliance with international financial regulations.
A strange thing is happening along the way to the Internet of Things, namely far too many devices to work with and manage. It has become clear that we'll need much higher efficiency user experiences that can allow us to more easily and scalably work with the thousands of devices that will soon be in each of our lives. Enter the conversational interface revolution, combining bots we can literally talk with, gesture to, and even direct with our thoughts, with embedded artificial intelligence, whic...
Imagine if you will, a retail floor so densely packed with sensors that they can pick up the movements of insects scurrying across a store aisle. Or a component of a piece of factory equipment so well-instrumented that its digital twin provides resolution down to the micrometer.
In his keynote at 18th Cloud Expo, Andrew Keys, Co-Founder of ConsenSys Enterprise, provided an overview of the evolution of the Internet and the Database and the future of their combination – the Blockchain. Andrew Keys is Co-Founder of ConsenSys Enterprise. He comes to ConsenSys Enterprise with capital markets, technology and entrepreneurial experience. Previously, he worked for UBS investment bank in equities analysis. Later, he was responsible for the creation and distribution of life settle...
Product connectivity goes hand and hand these days with increased use of personal data. New IoT devices are becoming more personalized than ever before. In his session at 22nd Cloud Expo | DXWorld Expo, Nicolas Fierro, CEO of MIMIR Blockchain Solutions, will discuss how in order to protect your data and privacy, IoT applications need to embrace Blockchain technology for a new level of product security never before seen - or needed.
Leading companies, from the Global Fortune 500 to the smallest companies, are adopting hybrid cloud as the path to business advantage. Hybrid cloud depends on cloud services and on-premises infrastructure working in unison. Successful implementations require new levels of data mobility, enabled by an automated and seamless flow across on-premises and cloud resources. In his general session at 21st Cloud Expo, Greg Tevis, an IBM Storage Software Technical Strategist and Customer Solution Architec...
Nordstrom is transforming the way that they do business and the cloud is the key to enabling speed and hyper personalized customer experiences. In his session at 21st Cloud Expo, Ken Schow, VP of Engineering at Nordstrom, discussed some of the key learnings and common pitfalls of large enterprises moving to the cloud. This includes strategies around choosing a cloud provider(s), architecture, and lessons learned. In addition, he covered some of the best practices for structured team migration an...
No hype cycles or predictions of a gazillion things here. IoT is here. You get it. You know your business and have great ideas for a business transformation strategy. What comes next? Time to make it happen. In his session at @ThingsExpo, Jay Mason, an Associate Partner of Analytics, IoT & Cybersecurity at M&S Consulting, presented a step-by-step plan to develop your technology implementation strategy. He also discussed the evaluation of communication standards and IoT messaging protocols, data...
Coca-Cola’s Google powered digital signage system lays the groundwork for a more valuable connection between Coke and its customers. Digital signs pair software with high-resolution displays so that a message can be changed instantly based on what the operator wants to communicate or sell. In their Day 3 Keynote at 21st Cloud Expo, Greg Chambers, Global Group Director, Digital Innovation, Coca-Cola, and Vidya Nagarajan, a Senior Product Manager at Google, discussed how from store operations and ...
In his session at 21st Cloud Expo, Raju Shreewastava, founder of Big Data Trunk, provided a fun and simple way to introduce Machine Leaning to anyone and everyone. He solved a machine learning problem and demonstrated an easy way to be able to do machine learning without even coding. Raju Shreewastava is the founder of Big Data Trunk (www.BigDataTrunk.com), a Big Data Training and consulting firm with offices in the United States. He previously led the data warehouse/business intelligence and B...
"IBM is really all in on blockchain. We take a look at sort of the history of blockchain ledger technologies. It started out with bitcoin, Ethereum, and IBM evaluated these particular blockchain technologies and found they were anonymous and permissionless and that many companies were looking for permissioned blockchain," stated René Bostic, Technical VP of the IBM Cloud Unit in North America, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Conventi...
When shopping for a new data processing platform for IoT solutions, many development teams want to be able to test-drive options before making a choice. Yet when evaluating an IoT solution, it’s simply not feasible to do so at scale with physical devices. Building a sensor simulator is the next best choice; however, generating a realistic simulation at very high TPS with ease of configurability is a formidable challenge. When dealing with multiple application or transport protocols, you would be...
Smart cities have the potential to change our lives at so many levels for citizens: less pollution, reduced parking obstacles, better health, education and more energy savings. Real-time data streaming and the Internet of Things (IoT) possess the power to turn this vision into a reality. However, most organizations today are building their data infrastructure to focus solely on addressing immediate business needs vs. a platform capable of quickly adapting emerging technologies to address future ...
We are given a desktop platform with Java 8 or Java 9 installed and seek to find a way to deploy high-performance Java applications that use Java 3D and/or Jogl without having to run an installer. We are subject to the constraint that the applications be signed and deployed so that they can be run in a trusted environment (i.e., outside of the sandbox). Further, we seek to do this in a way that does not depend on bundling a JRE with our applications, as this makes downloads and installations rat...
Widespread fragmentation is stalling the growth of the IIoT and making it difficult for partners to work together. The number of software platforms, apps, hardware and connectivity standards is creating paralysis among businesses that are afraid of being locked into a solution. EdgeX Foundry is unifying the community around a common IoT edge framework and an ecosystem of interoperable components.
DX World EXPO, LLC, a Lighthouse Point, Florida-based startup trade show producer and the creator of "DXWorldEXPO® - Digital Transformation Conference & Expo" has announced its executive management team. The team is headed by Levent Selamoglu, who has been named CEO. "Now is the time for a truly global DX event, to bring together the leading minds from the technology world in a conversation about Digital Transformation," he said in making the announcement.
In this strange new world where more and more power is drawn from business technology, companies are effectively straddling two paths on the road to innovation and transformation into digital enterprises. The first path is the heritage trail – with “legacy” technology forming the background. Here, extant technologies are transformed by core IT teams to provide more API-driven approaches. Legacy systems can restrict companies that are transitioning into digital enterprises. To truly become a lead...
Digital Transformation (DX) is not a "one-size-fits all" strategy. Each organization needs to develop its own unique, long-term DX plan. It must do so by realizing that we now live in a data-driven age, and that technologies such as Cloud Computing, Big Data, the IoT, Cognitive Computing, and Blockchain are only tools. In her general session at 21st Cloud Expo, Rebecca Wanta explained how the strategy must focus on DX and include a commitment from top management to create great IT jobs, monitor ...
"Cloud Academy is an enterprise training platform for the cloud, specifically public clouds. We offer guided learning experiences on AWS, Azure, Google Cloud and all the surrounding methodologies and technologies that you need to know and your teams need to know in order to leverage the full benefits of the cloud," explained Alex Brower, VP of Marketing at Cloud Academy, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clar...
The IoT Will Grow: In what might be the most obvious prediction of the decade, the IoT will continue to expand next year, with more and more devices coming online every single day. What isn’t so obvious about this prediction: where that growth will occur. The retail, healthcare, and industrial/supply chain industries will likely see the greatest growth. Forrester Research has predicted the IoT will become “the backbone” of customer value as it continues to grow. It is no surprise that retail is ...