Welcome!

Weblogic Authors: Yeshim Deniz, 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
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.
"Space Monkey by Vivent Smart Home is a product that is a distributed cloud-based edge storage network. Vivent Smart Home, our parent company, is a smart home provider that places a lot of hard drives across homes in North America," explained JT Olds, Director of Engineering, and Brandon Crowfeather, Product Manager, at Vivint Smart Home, in this SYS-CON.tv interview at @ThingsExpo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
SYS-CON Events announced today that Conference Guru has been named “Media Sponsor” of the 22nd International Cloud Expo, which will take place on June 5-7, 2018, at the Javits Center in New York, NY. A valuable conference experience generates new contacts, sales leads, potential strategic partners and potential investors; helps gather competitive intelligence and even provides inspiration for new products and services. Conference Guru works with conference organizers to pass great deals to gre...
The Internet of Things will challenge the status quo of how IT and development organizations operate. Or will it? Certainly the fog layer of IoT requires special insights about data ontology, security and transactional integrity. But the developmental challenges are the same: People, Process and Platform. In his session at @ThingsExpo, Craig Sproule, CEO of Metavine, demonstrated how to move beyond today's coding paradigm and shared the must-have mindsets for removing complexity from the develop...
In his Opening Keynote at 21st Cloud Expo, John Considine, General Manager of IBM Cloud Infrastructure, led attendees through the exciting evolution of the cloud. He looked at this major disruption from the perspective of technology, business models, and what this means for enterprises of all sizes. John Considine is General Manager of Cloud Infrastructure Services at IBM. In that role he is responsible for leading IBM’s public cloud infrastructure including strategy, development, and offering m...
"Evatronix provides design services to companies that need to integrate the IoT technology in their products but they don't necessarily have the expertise, knowledge and design team to do so," explained Adam Morawiec, VP of Business Development at Evatronix, in this SYS-CON.tv interview at @ThingsExpo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
To get the most out of their data, successful companies are not focusing on queries and data lakes, they are actively integrating analytics into their operations with a data-first application development approach. Real-time adjustments to improve revenues, reduce costs, or mitigate risk rely on applications that minimize latency on a variety of data sources. In his session at @BigDataExpo, Jack Norris, Senior Vice President, Data and Applications at MapR Technologies, reviewed best practices to ...
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.
Large industrial manufacturing organizations are adopting the agile principles of cloud software companies. The industrial manufacturing development process has not scaled over time. Now that design CAD teams are geographically distributed, centralizing their work is key. With large multi-gigabyte projects, outdated tools have stifled industrial team agility, time-to-market milestones, and impacted P&L stakeholders.
"Akvelon is a software development company and we also provide consultancy services to folks who are looking to scale or accelerate their engineering roadmaps," explained Jeremiah Mothersell, Marketing Manager at Akvelon, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
"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...
In his session at 21st Cloud Expo, Carl J. Levine, Senior Technical Evangelist for NS1, will objectively discuss how DNS is used to solve Digital Transformation challenges in large SaaS applications, CDNs, AdTech platforms, and other demanding use cases. Carl J. Levine is the Senior Technical Evangelist for NS1. A veteran of the Internet Infrastructure space, he has over a decade of experience with startups, networking protocols and Internet infrastructure, combined with the unique ability to it...
22nd International Cloud Expo, taking place June 5-7, 2018, at the Javits Center in New York City, NY, and co-located with the 1st DXWorld Expo 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 ...
"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...
Gemini is Yahoo’s native and search advertising platform. To ensure the quality of a complex distributed system that spans multiple products and components and across various desktop websites and mobile app and web experiences – both Yahoo owned and operated and third-party syndication (supply), with complex interaction with more than a billion users and numerous advertisers globally (demand) – it becomes imperative to automate a set of end-to-end tests 24x7 to detect bugs and regression. In th...
"MobiDev is a software development company and we do complex, custom software development for everybody from entrepreneurs to large enterprises," explained Alan Winters, U.S. Head of Business Development at MobiDev, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
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 ...
"There's plenty of bandwidth out there but it's never in the right place. So what Cedexis does is uses data to work out the best pathways to get data from the origin to the person who wants to get it," explained Simon Jones, Evangelist and Head of Marketing at Cedexis, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
SYS-CON Events announced today that CrowdReviews.com has been named “Media Sponsor” of SYS-CON's 22nd International Cloud Expo, which will take place on June 5–7, 2018, at the Javits Center in New York City, NY. CrowdReviews.com is a transparent online platform for determining which products and services are the best based on the opinion of the crowd. The crowd consists of Internet users that have experienced products and services first-hand and have an interest in letting other potential buye...
SYS-CON Events announced today that Telecom Reseller has been named “Media Sponsor” of SYS-CON's 22nd International Cloud Expo, which will take place on June 5-7, 2018, at the Javits Center in New York, NY. Telecom Reseller reports on Unified Communications, UCaaS, BPaaS for enterprise and SMBs. They report extensively on both customer premises based solutions such as IP-PBX as well as cloud based and hosted platforms.