Presentation on theme: "Coeus & Interactive Debugging David B. Harrison Brown University."— Presentation transcript:
Coeus & Interactive Debugging David B. Harrison Brown University
Crash Course “The problem with most crash courses is that they crash.” - Berel Wein
Presenter David B. Harrison Sr. Programmer / Analyst Brown University 9 months experience with Coeus BS and MS in Computer Science 20 years of Software Engineering
Crash Course in Interactively Debugging Coeus Why? Background Requirements Setting up Real-world examples
Why would you want to do that? Understanding the architecture Greater speed in solving problems Quickly test changes, fixes, or enhancements! Assist in making Institution-specific changes
Brown & Coeus Background Originally, Brown had a homemade system Coeus @ Brown since version 4.0 – Ben DiMolfetta assisted in original implementation Main Coeus developer/support for Brown left 11 months ago David Harrison joined Brown 9 months ago. Started learning Coeus at that time.
Inspiration Frustrated with lack of documentation Needed to understand the architecture Builds were preformed on remote servers. It took at least 15-20 minutes, just to see if a change compiled. This is a distraction. Using the right tools and local builds, should make the process much faster… – Goal: Stay in the “Zone”
Recent Experience Brown University recently completed major upgrade from Coeus 4.3.7 to 4.4.3 Migrated 4.3.x customizations to 4.4.x – Stored procedures – Blort-loads of XML / XSL templates The FOP Engine upgrade affected rendering of custom reports – Customized Email notifications
Approach Preferred “See One” “Do One” “Teach One” Actual Jump in Repeat – Drink coffee – Learn some – Do Some “Do or do not. There is no Try.” (Jedi Master Yoda) Deploy Huge sigh of relief! “Teach One!”
Getting to know you What is your primary role? – Most people said “Developer” or “Support” Do you use revision control for Coeus? – Approximately 3 out of 12 attendees use a revision control system. Do you use a change management or deployment system? – None.
Other Questions Planning to move to Coeus 4.4.4 or KC soon? Formal process in place for Upgrades & QA?
Required Software Java Ant Apache Tomcat Eclipse – Helios edition recommended A Database! – Oracle is recommended SQL / Schema explorer tool
Pre-conditions Install the required software! Retrieve Coeus source Setup Tomcat Setup & test database connection Update the Coeus build.properties file We’re not going to cover this part. Ant build – Build from the command-line, first!
Apache Tomcat Setup Define the data source Configure Tomcat Java options Copy libraries into Tomcat’s common lib folder
Apache Tomcat – Data Source In the Tomcat conf directory Add a Data Source Resource to the Context.xml file, There are other areas where you could define the data source.
"name": "Apache Tomcat – Data Source In the Tomcat conf directory Add a Data Source Resource to the Context.xml file, There are other areas where you could define the data source.",
Tomcat Java Options Load the Apache Tomcat “Configure Tomcat” program. Go to the Java tab Add the “Java Options” -Xdebug -Xrunjdwp:transport=dt_socket,address=11555,server=y,suspend=n -verbose:class
Tomcat Libraries Libraries copied into Tomcat’s common lib Tomcat-5.5\common\lib – ojdbc14.jar (If you’re using Oracle) – log4j-1.2.16.jar – coeusmail.jar
Eclipse Setup Now for some fun stuff! You do have Eclipse, right?
Setting up the Eclipse Project Import the Coeus project into Eclipse. We’ll use the Ant build script. Import the Coeus as a new Java Project File -> New -> Project
Setting up the Eclipse Project New Project -> Pick “Java Project from Existing Ant Buildfile”
Setting up the Eclipse Project Browse to find and select the Ant build file build.xml
Setting up the Eclipse Project It worked! Now there is a project called “Coeus4”
Right click & Select Properties Select the project
Setting up the Eclipse Project Properties for Coeus4 Java Build Path Libraries Add two external jars. (in the java JDK) – Jce.jar – Jsse.jar Ok!
Setting up the Eclipse Project Hopefully… you’ve got a Coeus4 project, with no build errors. What does that mean? How can I tell if there are no errors?
Like sources of build errors If you get compile errors about classes not being found… Import the source into the project…
Eclipse Debug Configurations We’ll setup to Debug Configurations – Coeus Lite (AKA “Server”) – Coeus Premium
Coeus Lite (Server) Debug Config Run -> Debug Configurations
Coeus4 Server Debug Config Find “Remote Java Application” Click on the “New” button to create a configuration
Coeus4 Server Debug Config Name: Coeus4-Server Connection Props – Host: localhost – Port to 11555
Coeus4 Server Debug Config On the Source Tab… Make sure that the source is selected
Coeus Premium Debug Config Similar to Lite/server Just use port 8989
Coeus.jnlp modification For debugging only, comment out the J2SE line, in Coeus.jnlp, Left in, it prevents the environment variables from being passed to the JVM. We need those! -->
Starting the Environment Start Coeus Lite – Run Tomcat, with the Coeus WAR deployed – The Default Coeus WAR is fine Start the Coeus Premium – Use ‘javaws’ to point at the local JNLP file. This will start it, and it will have the debugger enabled, listening on port 8989 – Javaws http://localhost:8080/coeus/coeus.jnlphttp://localhost:8080/coeus/coeus.jnlp
Starting the Environment (2) Eclipse – Start Eclipse – Attach debugger for Coeus Premium – Attach debugger for Coeus Lite
Debugging Techniques Break points and Tracing – “Andy, could you duplicate the issue you reported on my development system?” – “Sure…” – “Aha!!!” Stepping through code and looking at the call- stack Change a variable, during run time!
Debugging Techniques (2) Make a change to the source code and see how it affects the functionality, immediately. XML and XSL Capture XML and XSL Fix and Tweak XSL templates outside of Coeus Logs – Use the log to help find the right Class and line of code to investigate – Add more logging information to Coeus
Real World Examples Searching for a schedule, based on ‘*’ wild- card only fails with error message. – CoeusSearch.xml
Real World Examples (2) “Email Link not working” – BIT00175 – Link to Coeus not working in Email body in 4.4.3
Thanks! Brown University – Elaine Saklad – David Boylan – Chris Moore – Jennifer Quinn – Emily Derby – Andy Krajewski WinMill Software – Ben DiMolfetta (Introduction & collaboration) Rob Yetter Sabarinath Nair The whole Coeus Consortium
Links for Required Software Coeus Java JDK Eclipse IDE for Java EE Developers Eclipse IDE Apache Tomcat Ant
Optional Software Toad Extension for Eclipse Quest Toad Altova XML SpyXML Spy
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