Welcome!

Weblogic Authors: Elizabeth White, Michael Meiner, Michael Bushong, Avi Rosenthal

Related Topics: Weblogic, Eclipse

Weblogic: Article

Configuring Eclipse for Remote Debugging a WebLogic Java Application

A J2EE application deployed in the WebLogic server may be debugged in the Eclipse ID

A J2EE application deployed in the WebLogic server may be debugged in the Eclipse IDE with the remote debugger provided by Eclipse. Without a debugger the error message has to be obtained from the application server error log to debug the application.

With the remote debugger provided by Eclipse, exception breakpoints may be added to the application file to debug. When an application is run in WebLogic and the application generates an error, the application gets suspended and the Eclipse IDE Debug perspective displays the error. In this tutorial we will debug a WebLogic Application Server application in Eclipse.

To debug an application deployed in the WebLogic Server from Eclipse, start the WebLogic Server in debug mode and configure a remote debugging configuration in Eclipse. Next, connect the Eclipse remote debugger to the WebLogic Server and debug applications running in the server. We will develop an example servlet application and deploy the application in WebLogic. First, the servlet is run without any error and subsequently an error is introduced in the servlet to demonstrate the remote debugging feature in Eclipse.

Preliminary Setup
Download the WebLogic 8.1 Application Server and install it. Download the Eclipse 3.0 or Eclipse 3.02 zip file eclipse-SDK-3.0-win32.zip (www.eclipse.org/downloads/index.php) and install it as well.

Developing a WebLogic Application
After installing the WebLogic Server and the Eclipse IDE, develop a servlet application to run and debug in the WebLogic Server. The example servlet application consists of a doGet method, which prints out a String message to the browser. The example servlet, WebLogicServlet.java, is shown in Listing 1.

Create a directory structure for a Web application. Create a WEB-INF directory and a classes directory in the WEB-INF directory. Create a package directory servlets for the example servlet and copy the WebLogicServlet.java file to the servlets directory. Create a web.xml deployment descriptor for the Web application. Copy the web.xml file to the WEB-INF directory. Listing 2 shows the web.xml file.

The example servlet is mapped to URL pattern /weblogic. The structure of the Web application is illustrated below.


/WEB-INF
| |
web.xml classes
|
servlets
|
WebLogicServlet.class
The compiling, packaging, and deploying of the Web application is done in the Eclipse IDE with an Ant build.xml file. Develop an Ant build.xml file that consists of targets to compile the WebLogicServlet.java and package and deploy the webapp.war Web application. Listing 3 shows the build.xml file.

Table 1 shows the properties of the build.xml file. Table 2 shows the file's targets.

Set the debug attribute of the javac task in the build target to true to enable compilation in debug mode. By compiling an application in debug mode the line number, which generates the exception in a WebLogic Server application, gets displayed in the Debug perspective. Create a new project in the Eclipse IDE. Select File>New>Project. The New Project frame gets displayed. In the New Project wizard select Java>Java Project. Click on the Next button. The New Java Project frame gets displayed. In the New Java Project frame specify a Project Name, EclipseWebLogic for example, and click on the Next button. In the Java Settings frame add a source folder to the project with the Add Folder button.

The New Source Folder frame gets displayed. In the New Source Folder frame specify a folder name, src for example. A source folder gets added to the project. A message prompt gets displayed to update the source folder and the output folder. In the New Java Project frame click on the Finish button to create the project. A new project gets added to the Eclipse IDE. Next, select File>Import to import the example servlet source folder to the project. In the Import Select frame select File System and click on the Next button. In the Import File System frame select the src folder and the build.xml file and then click on the Finish button. The servlet source files get added to the project.

Run the build.xml file to compile, package, and deploy the servlet Web application to the WebLogic Server. Right-click on the build.xml file and select Run>Ant Build. The Web application .war file webapp.war gets generated and is deployed to the WebLogic 8.1 Application Server applications directory. Next, start the WebLogic Server with the bin/run script. Invoke the example servlet in a Web browser with the URL http://localhost:7001/webapp/weblogic. The WebLogicServlet runs in the WebLogic Server and the output gets displayed in the browser.

Configuring a Remote Debugging Configuration in Eclipse
To remote debug a WebLogic application in Eclipse start the WebLogic Server in debug mode. Set the WebLogic Server in debug mode by setting the debug options in the startWebLogic batch script file. The debugging provided by WebLogic is based on the Java Platform Debugger Architecture (JPDA). Set the JAVA_OPTS variable as:

set JAVA_OPTS= -Xdebug -Xnoagent
-Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n %JAVA_OPTS%

Table 3 shows the different debug parameters. For further explanation of the debug settings refer to the JPDA documentation (http://java.sun.com/j2se/1.4.2/docs/guide/jpda/). To demonstrate the remote debugging feature of Eclipse, add an exception to the WebLogicServlet.java file. For example, add a NullPointerException to the WebLogicServlet.java class. Replace

out.println("Eclipse WebLogic Remote Debugging");

with

String str=null;
out.println(str.toString());

Next, configure a debug configuration for the Eclipse project. Select the Debug option in the Debug option list. The Debug frame gets displayed. In the Debug frame select the Remote Java Application node. Right-click on the node and select New. In the Debug configuration frame specify a name for the Debug configuration. Select the project that is to be debugged. Select the EclipseWebLogic project previously created in the Eclipse IDE. Select the default value for Connection Type. In the Connection Properties, specify localhost as the Host and specify the Port as the port that was specified in the startWebLogic batch script of the WebLogic server, 8787. Click on the Apply button. A remote Java application debug configuration gets added.

Next add exception breakpoints to the WebLogicServlet.java file. To demonstrate the remote debug feature of Eclipse a NullPointerException was added to the WebLogicServlet.java file earlier in this section. To add a breakpoint to the servlet class, Select Run>Add Java Exception Breakpoint. In the Add Java Exception Breakpoint frame select the NullPointerException. The NullPointerException breakpoint gets added to the servlet class. If a NullPointerException is generated in the servlet application in the WebLogic Server, the application gets suspended and the Debug perspective of the Eclipse IDE displays the exception.

Remote Debugging a WebLogic Application
After configuring a debug configuration for the example servlet application deployed in the WebLogic Server, we will debug the servlet application in the Eclipse IDE. Create a webapp.war Web application from the modified (with the NullPointerException) WebLogicServlet.class file with the build.xml file as explained in the "Developing a WebLogic Application" section. Start the WebLogic Server. The server starts in debug mode with the debug options specified in the startWebLogic batch file.

Next, select the EclipseDebug debug configuration in the Debug frame. Click on the Debug button to connect the remote debugger to the WebLogic Server. The Eclipse remote debugger gets connected to the WebLogic Server. Select the Debug Perspective button to display the debug perspective of the Eclipse IDE. In the Debug perspective the remote debugger is shown connected to the WebLogic server at localhost, port 8787. Access the WebLogicServlet in the WebLogic Server with the URL http://localhost:7001/webapp/weblogic. Because the servlet has a NullPointerException, the servlet gets suspended with a NullPointerException in the Debug perspective. The line that produced the exception gets displayed.

The line that throws the exception is the out.println(str.toString()); code line. The servlet application may be debugged with the different debug options listed by selecting Run in the Eclipse IDE.

Summary
In this tutorial a WebLogic application was debugged in the Eclipse IDE. A WebLogic application may also be debugged from another IDE such as JDeveloper.

More Stories By Deepak Vohra

Deepak Vohra is a Sun Certified Java 1.4 Programmer and a Web developer.

More Stories By Ajay Vohra

Ajay Vohra is a senior solutions architect with DataSynapse Inc.

Comments (3) 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
Sreedhar 05/18/06 01:15:58 PM EDT

Does any one know how to do remote debug ging in clustered environment??

Neena 03/09/06 05:59:07 PM EST

Do you know how to debug a Clustered WebLogic Environment or where we can get the information on to set up debugging for Cluster?

SYS-CON Brazil News Desk 01/18/06 07:19:38 PM EST

A J2EE application deployed in the WebLogic server may be debugged in the Eclipse IDE with the remote debugger provided by Eclipse. Without a debugger the error message has to be obtained from the application server error log to debug the application.

@ThingsExpo Stories
The Internet of Things can drive efficiency for airlines and airports. In their session at @ThingsExpo, Shyam Varan Nath, Principal Architect with GE, and Sudip Majumder, senior director of development at Oracle, will discuss the technical details of the connected airline baggage and related social media solutions. These IoT applications will enhance travelers' journey experience and drive efficiency for the airlines and the airports. The session will include a working demo and a technical d...
What happens when the different parts of a vehicle become smarter than the vehicle itself? As we move toward the era of smart everything, hundreds of entities in a vehicle that communicate with each other, the vehicle and external systems create a need for identity orchestration so that all entities work as a conglomerate. Much like an orchestra without a conductor, without the ability to secure, control, and connect the link between a vehicle’s head unit, devices, and systems and to manage the ...
Businesses are struggling to manage the information flow and interactions between all of these new devices and things jumping on their network, and the apps and IT systems they control. The data businesses gather is only helpful if they can do something with it. In his session at @ThingsExpo, Chris Witeck, Principal Technology Strategist at Citrix, will discuss how different the impact of IoT will be for large businesses, expanding how IoT will allow large organizations to make their legacy ap...
The many IoT deployments around the world are busy integrating smart devices and sensors into their enterprise IT infrastructures. Yet all of this technology – and there are an amazing number of choices – is of no use without the software to gather, communicate, and analyze the new data flows. Without software, there is no IT. In this power panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists will look at the protocols that communicate data and the emerging data analy...
As ridesharing competitors and enhanced services increase, notable changes are occurring in the transportation model. Despite the cost-effective means and flexibility of ridesharing, both drivers and users will need to be aware of the connected environment and how it will impact the ridesharing experience. In his session at @ThingsExpo, Timothy Evavold, Executive Director Automotive at Covisint, will discuss key challenges and solutions to powering a ride sharing and/or multimodal model in the a...
SYS-CON Events announced today that Commvault, a global leader in enterprise data protection and information management, has been named “Bronze Sponsor” of SYS-CON's 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Commvault is a leading provider of data protection and information management solutions, helping companies worldwide activate their data to drive more value and business insight and to transform moder...
Cloud computing is being adopted in one form or another by 94% of enterprises today. Tens of billions of new devices are being connected to The Internet of Things. And Big Data is driving this bus. An exponential increase is expected in the amount of information being processed, managed, analyzed, and acted upon by enterprise IT. This amazing is not part of some distant future - it is happening today. One report shows a 650% increase in enterprise data by 2020. Other estimates are even higher....
What are the new priorities for the connected business? First: businesses need to think differently about the types of connections they will need to make – these span well beyond the traditional app to app into more modern forms of integration including SaaS integrations, mobile integrations, APIs, device integration and Big Data integration. It’s important these are unified together vs. doing them all piecemeal. Second, these types of connections need to be simple to design, adapt and configure...
Digital innovation is the next big wave of business transformation based on digital technologies of which IoT and Big Data are key components, For example: Business boundary innovation is a challenge to excavate third-party business value using IoT and BigData, like Nest Business structure innovation may propose re-building business structure from scratch, as Uber does in the taxicab industry The social model innovation is also a big challenge to the new social architecture with the design fr...
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, wh...
Data is an unusual currency; it is not restricted by the same transactional limitations as money or people. In fact, the more that you leverage your data across multiple business use cases, the more valuable it becomes to the organization. And the same can be said about the organization’s analytics. In his session at 19th Cloud Expo, Bill Schmarzo, CTO for the Big Data Practice at EMC, will introduce a methodology for capturing, enriching and sharing data (and analytics) across the organizati...
SYS-CON Events announced today that Bsquare has been named “Silver Sponsor” of SYS-CON's @ThingsExpo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. For more than two decades, Bsquare has helped its customers extract business value from a broad array of physical assets by making them intelligent, connecting them, and using the data they generate to optimize business processes.
SYS-CON Events has announced today that Roger Strukhoff has been named conference chair of Cloud Expo and @ThingsExpo 2016 Silicon Valley. The 19th Cloud Expo and 6th @ThingsExpo will take place on November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. "The Internet of Things brings trillions of dollars of opportunity to developers and enterprise IT, no matter how you measure it," stated Roger Strukhoff. "More importantly, it leverages the power of devices and the Interne...
19th Cloud Expo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud strategy. Meanwhile, 94% of enterpri...
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 lea...
According to Forrester Research, every business will become either a digital predator or digital prey by 2020. To avoid demise, organizations must rapidly create new sources of value in their end-to-end customer experiences. True digital predators also must break down information and process silos and extend digital transformation initiatives to empower employees with the digital resources needed to win, serve, and retain customers.
Video experiences should be unique and exciting! But that doesn’t mean you need to patch all the pieces yourself. Users demand rich and engaging experiences and new ways to connect with you. But creating robust video applications at scale can be complicated, time-consuming and expensive. In his session at @ThingsExpo, Zohar Babin, Vice President of Platform, Ecosystem and Community at Kaltura, will discuss how VPaaS enables you to move fast, creating scalable video experiences that reach your...
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 sett...
SYS-CON Events announced today that SoftLayer, an IBM Company, has been named “Gold Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2016, at the Javits Center in New York, New York. SoftLayer, an IBM Company, provides cloud infrastructure as a service from a growing number of data centers and network points of presence around the world. SoftLayer’s customers range from Web startups to global enterprises.
Internet of @ThingsExpo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 19th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The Internet of Things (IoT) is the most profound change in personal and enterprise IT since the creation of the Worldwide Web more than 20 years ago. All major researchers estimate there will be tens of billions devices - comp...