Archive for category Conferences
I arrived on evening before just in time for the life cooking event and later at the bar to meet lot of the people I already know and some new too.
The morning begins with a short introduction to the format of a barcamp.
As warm up Jens Schauder starts with an talk about clean code. He begins to compare what the lack of hygiene for Middle Ages mean and the statement that we are in the IT Middle ages. In extreme cases not tested and not understandable software can kills people! So the task for every day is “write an test” and refactor the code to clean code.
Then the barcamp planning starts. In short time three slots are filled up and the really barcamp starts.
Influenced by the starting talk next there was a session related to clean code and how to implement the related processes. You should teach a little bit of the theory behind it. It is essential to decide all rules with the whole team and review the continuous use of it. If the rules are not followed, then first you should ask why this happens and listen for the reasons. Jens Schauder recommends here these books. Maybe you have to adjust the rules to convince all developers. But in extreme cases of deny any of the decided rules you should escalate and delegate this to the responsible manager.
Next session was about how to test heterogeneous applications, especially SQL, PL/SQL and Forms but others too. I mentioned here two possible strategies, which both has it’s tradeoffs:
- End to end testing with expensive Tools, which provides all the required technology plugins, eg.
- Technology testing and mocking the behavior of interfaces to other technologies, you have to learn all off this and provide the infrastructure for it.
I noticed here that testing is mainly seen as to check the contract between developer and customer, sometimes useful for regression test but seldom as required for changing or refactoring the code. The participants seems to be overwhelmed by the amount of tools and effort to do automatic testing. Yes – there is a lot to do in advance, which pays off later.
In the next break I get a shortcut for actual requirement for forms change to implement some kind of SSO without additional servers. I get some nice hints and have now to check, if one of this is successful. This are the advantages of networking here.
The we discussed about Alternatives to Oracle Reports. Seems that it depends on your requirements, which tool to choose. Please do an value analysis here. So if you need pixel exact layout or want not pay much money Oracle Business Intelligence Publisher will not your friend. If you search for an active community maybe you should not choose Eclipse BIRT or at least use the commercial version from Actuate. But both of these and Jasper Reports are used from present participants. Further alternatives seem to be SAP Chrystal Reports and Pentaho. And don’t forget to test exotic features like widows and orphans!
After a coffee break we discussed the future of Oracle ADF. The punchline here was: ADF is not dead, but JDeveloper is very buggy. None of the participants does really miss any bit feature, but most struggles with the IDE. It seems, that the problems are bigger, when you work on windows. Maybe some of the product managers should be forced to worked again with windows to see our problems. I have articulated there 2 problems with the ADF community. I we try to raise the acceptance we should not try to extend the focus of the activities to alternative technologies as MAF or JET. Second we should not self call ADF into question on every conference, we should leave this part to the fans of other technologies.
The last session again turns around automatic testing of PL/SQL, some repeating to the described session above.
In closing session most of the participants said, that they want to come back next year. Maybe it is better to put some fixed sessions or workshops, as this is easier to describe to the bosses as “I will go this event, but it is not clear, what will happens there.”
I have learned not so much new things this year, but I attend these time more the known to me technologies. But I get the confirmation, that most of the things we do or plan do to are on the right track.
Unfortunately I observed some people in the sessions, which comes only to search for finding confirmations to reject for itself, what at least the initiator of the topic want to do.
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For automation of all of my processes I need Jenkins in my development server.
First I had installed Jenkins as Docker container via Vagrant Docker provider. But with this architecture it was very complicated to create docker images and run Docker containers on the Docker host, in this case my Vagrant Virtualbox.
So for simplification I have decided to install Jenkins with the provisioning of the Vagrant Virtualbox via a shell provider in my Vagrantfile:
... # persistant storage for jenkins config.vm.synced_folder "C:\\shared\\virtual_storage\\jenkins_home", "/var/lib/jenkins", type: "nfs", owner: 994, group: 992, create: true ... # install jenkins config.vm.provision :shell, :path => "add_jenkins.sh" ...
First I map a shared folder of my Windows Host to the Vagrant Virtualbox to persist my Jenkins Configuration.
Then I install Jenkins via the shell script add_jenkins.sh.
sudo yum -y install java sudo wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat-stable/jenkins.repo sudo rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key sudo yum -y install jenkins sudo sed -i -e 's/JENKINS_JAVA_OPTIONS="-Djava.awt.headless=true"/JENKINS_JAVA_OPTIONS="-Djava.awt.headless=true -Dmail.smtp.starttls.enable=true"/g' /etc/sysconfig/jenkins sudo service jenkins start
Jenkins requires java, so I install it first. After that I get the latest Long-Term Support (LTS) repository, import it and install Jenkins from there. Then I do some configuration, which I need for my jobs and start Jenkins. An open issue is, that I have to restart Jenkins after Vagrant restart, because the shared folders are unfortunatly mounted after service starts.
After first install you have to enter the credential information from the filesystem as requested, all later installations use the persistent Jenkins configuration, so you can login and start from where you have left Jenkins.
Here you find the source code for this blog.
Here you find more about the topic “Virtual Development Server”.
Another DOAG is over and here are my summary.
Unfortunately the early train from duesseldorf arrives not before 9:30, so I missed the first morning slot. But on the other hand I this was the slot where I had to decide between 8 presentations, which I’m interested in.
The first soft skill presentation was about creative techniques beyond brain storming. The mentioned 3 techniques was all unknown for me, maybe I give it a try next time.
The next presentation promises a live demo of a forms 12c migration to production. Nothing really new here and remembers me for an “beautify our village” contest. But fairly enough for customers which absolutely want to remain on Oracle Forms. As Translation Hub 12c is not available and Oracle Reports 12c will be the last version, I think 11g will the last version we will use on our side before completing migration to ADF.
I attend two presentations, which shows Auraplayer on top of Oracle Forms to provide mobile applications via Oracle Mobile Cloud Service (MCS). I understand the MCS thing, although I find it very complicated to use. But put another layer on complicated and most slowly Oracle Forms to create web services for mobile applications seems no use case for me. I doubt that the recording of web services works really well for complicated forms which switch the displayed items and canvases depending on the selected data. All samples was very simple forms, but the response time of the resulting mobile app was not acceptable for me.
The presentation about continuous integration in APEX give me some new ideas for maybe replacing our actual deployment processes for PL/SQL in the future. Will have a look at the mentioned sql-maven-plugin, when we go for Maven for ADF too. Will check Rspec as BDD framework to run PL/SQL unit tests. Promising is the feature to tie together Selenium tests and data checks in the same Rspec test definition. One drop of bitterness remains, as the presenter had no idea how to solve a merge conflict. Seems that this was only a proof of concept and not really used daily there.
Best practices for PL/SQL performance was a good reminder, what I all know about this topic but use to seldom. But will use some of the configuration things like native compilation of the system packages or PL/SQL optimization level in my docker instances for automatic testing to optimize test times.
SQL tips and tricks was a sovereign presentation, but shows me again that for several Oracle database releases only little improvements for the developer comes with.
In session “Standing at a Crossroads, ADF and JET” Duncan Mills clearly show the differences between Oracle ADF and Oracle JET. Running gag: The “Schnecke Chart” for quick decision between both. Will look, if I can reuse this for other decisions.
Next I tried an meeting at the Unconference about continuous integration for PL/SQL. But the most discussions really goes about the automation part. Most participants missed the most importantly definition of continuous integration: ” … continuous integration (CI) is the practice of merging all developer working copies to a shared mainline several times a day.”. Unfortunately I realize now that in the German Wikipedia translation this basis is completely softened: “developer should integrate as often as possible”. Not really new for me here, hope I have told something useful to the others.
“Extending Oracle ADF BC Models to REST, Cloud and Mobile” was a good time to remember what’s now possible as it really available and we now try another migration away from ADF 11g to the hottest version. I have seen this in the last conferences already.
Have read “Deep Dive Into Oracle ADF Transactions: Advanced Techniques” in the web already, but the information was a little bit clearer after seeing Eugene Fedorenko live.
Something completely different: “Free Load Testing Tools for Oracle Database”. I had known Swingbench before. SLOB is completely new for me and did not seen Apache JMeter JDBC test in this context before. Will test the last maybe in the future.
“Top 10 stumble stones for ADF 12c” was very technical but cool, good to have Markus Klenke at our site while our coming migration next weeks.
“Faster, Better, Cheaper: Oracle ADF Development in the Cloud” – with lot of problems in the demo part. Maybe really because of the DOAG WiFi. Quick Tip for all presenters: as I know at DOAG conferences there is ever an laptop available with LAN, try to put it in your laptop! For the content: DCS seems to restricting to much. I prefer Jenkins over Hudson. No push option directly with commit i JDeveloper etc.
Masking test data is very relevant in our banking busines, so I attend “Oracle Data Redaction live in Telko”. Seems that there are many fall knits here, as this doesn’t seem to solve all requirements out of the box.
Before the evening keynote Günter Stürner and Jürgen Menge was awarded, congratulations to both.
Now we are not ready for the evening party, we start the yearly German ADF Community meeting. Interesting part was a presentation of the Tools Statement of Direction, which again clearly differentiate between ADF, MAF, JET, MAX and ABCS. We get the clear statement ADF is standard for SAAS and JET for PAAS development at Oracle. In my opinion Oracle miss to communicate this in other presentations and miss to further present ADF in the public. A lot of questions of the present Community members was answered here too. Later we eat together with some of the product managers and community members and discussed topics for future presentations.
Later I go back to my hotel to remotely patch our fresh ADF 188.8.131.52 Server with patch for critical escalated bug to start our planned migration for ADF 184.108.40.206 next week. More later in a separate post.
Thank god the roll-out of SQL Developer 4.1.5 is not started already in our company. Will look how fast I can add the free PLSQL/COP SQL Developer Plugin of Philip Salvisberg from Trivadis to the silent install process. He showed in “Fighting Bad PL/SQL” the theory and the practice how his static code analysis tool for PL/SQL does work. Depending on the outcome and the price maybe we will later implement in continuous integration.
The keynote “Big Picture of digital revolution” wakes the expectation to us to take responsibility for the effects of digital revolution to the society and makes me very thoughtful.
After our hopefully successful migration to ADF 220.127.116.11 I want to change our deployment from ANT to Maven, so I attend the presentation “Migration Maven Possibilities”. This gives a good reminder what to do at that point.
Very interesting presentation, which really does not deserves so few visitors, was “Home Lab Setup and Familiarization of E-Business R12.2”. My time with E-Business Suite is over 15 years away, so I was surprised that I recognized much of the components. I think I’m sure not to install E-Business Suite for the moment, but lot of the instructions for the Home Lab Setup could I reuse for other technologies. Some concepts for the E-Business Suite, eg. double filesystem for reducing offline time for patching, are very interesting.
With last 2 presentations I enter again the world of ThickDatabase paradigm. We ever know that executing business in the database seems faster as in the middle tier, but we had no proofs. Now Toon Koppelaars from Oracle itself give us this with a deep analysis. The question remains – will the other Oracle departments will learn from this?
Tomorrow I will be trained in Continuous Delivery with Oracle Fusion Middleware and Oracle Cloud. I will release another blogs, when implementing some findings from this training.
As you see I switch often between technologies. This happens not ever voluntary. Normally I interested more in the development like ADF, MAF and JET. This year these presentation are unfortunately distributed over the conference. So I have discussed this today with the DOAG executives, they will improve this next year.
Nevertheless I get a lot of ideas from presentations in technologies I do not or not regularly use, so sometime I intentionally choose from such interesting presentations.
A recommendation for all conference visitors. Read the abstracts before you go to a conference and maybe before you book! You avoid disappointments because of wrong expectations. Often the title has the only purpose to be accept the presentation and has little to do with the real content. Abstracts give you often a better idea about the content.
This was my second day:
Michael Tamm (optivo GmbH): Feature Toggles on Steroids
Very good summary off all topic’s covering feature toggles. Wish I had this summary 2 years before, were we have evaluated this. Unfortunately furthermore no solutions for declarative frameworks like Oracle ADF with it’s wizards and xml configurations, which later generated code. Ironic answer to my question: “Don’t use frameworks – use Java”
Alexander Casall (Saxonia Systems AG): User Experience for techies
Now comes someting completely different. As least I had expected. No techniques etc.. There are really german standards “Ergonomics of human-system interaction” in ISO 9241 – 110 (Dialogue principles) and ISO 9241 – 210 (Ergonomics of human-system interaction). I have to read this, if it really would help in development, or the presenter interprets this on its own. Nice and surprising presentation.
Adam Gowdiak (Security Explorations): Java (in)security (Keynote)
The presenter is really angry about Oracle and co. and the security in Java. Nevertheless it seems he has specialized only on this topic and earn this money on this. So I doesn’t know, if somebody or another product is better. What about security in OpenJDK? And what are now my alternatives? A little depressing keynote.
Lars Röwekamp (open knowledge GmbH): Courage to professionalism
I don’t know, what I had expected here, but this was a nice surprise too. The talk was about to find a common language between customer, analyst, developer and other roles. The patterns “Rich Entities” and “Value Objects” helps to find a way out of the helper, util and manager class hell and seems to improve the readability of the code for all stakeholders. But how will this fit in declarative Frameworks like Oracle ADF and it’s generated classes? Have to think about it. Very good speaker!
Unfortunately the worst presentation comes from Oracle itself. To be fair: this presentation should be held by Bruno Borges, which was prevented to come to Javaland. Tip: Never hold a presentation, which is created by another person, if you don’t know, what he know about the subject. But I’m not sure if I had understood more, if Bruno had held the presentation. I didn’t find a red thread in the slides. And I must add, I didn’t really find an alternative presentation in this time slot.
Alexander Heusingfeld, Tammo van Lessen (innoQ Deutschland GmbH): When Microservices Meet Real-World Projects: Lessons Learned
Interesting presentation but the topic was missed. This had little to do with Microservice, more what a consultant or any person has to learn on his way from Junior to Senior: communicate, communicate, communicate. Especially when you want to change something.
Stephan Kaps (Bundesversicherungsamt): Flyway vs. LiquiBase – Battle of the database migration tools
I wanted to do this comparison several times before, but had never enough time. Now I’m relative sure that I will start with Liquibase in my next private project before I develop the application. This was the subjective winner of the battle too. I’m overwhelmed by the mass of features of both tools. Very good summary!
This was a nice workshop to plan the application and technical architecture of a given small set of requirements. Result for me: the many participants from a lot of other companies comes to very similar architecture depending on the assumption they made. In real life you have to communicate again and again with your stakeholders to get answered all of the questions and get quick feedback from them. I have urgently to refresh my knowledge of tools for UML diagramming and graphical presentations. And for structured proceeding maybe I should look for TOGAF training?
This was inspiring conference, which gives me a lot of fresh ideas and reminders for some spilled goals for my private and company projects. I think we’ll see us next year!
The location in Phantasierend Brühl near cologne was very fine. Unfortunately the conference rooms had not enough space this year so for some presentation you have to go to 2 rooms outside of the parc. Additionally it is not understandable, why there is not wlan for such a conference.
This was my first day:
Why I don’t record a test with all information of my page objects, eliminate all variable parts until it is stable and reproducible and define this a my basic truth. If a code change break this test I check the problems, if these were expected or not. Good idea but – how many data created this and how long does it take to compare all this with previous successful run. I hope this new startup will give us effective tools for this paradigm.
When I can trust the Profiler, what are the basics of it and how can I ensure that the right data are available for it. Which traps exist, when instrumenting for tracing and logging. Nice insights, but I’m sure I have to reread the presentation to fully understand.
Exhibition Hall after lunch
Played around with a Jenkins docker instance and the new Pipeline Plugin (formerly named Workflow Plugin) at the Cloudbees booth. I had a nice short talk with Bernhard Cygan about some other Jenkins topics.
Tobias Kraft, Ralf Müller (exensio GmbH): Spock and Geb: Clear and comprehensible tests
This is an interesting combination of frameworks for human readable behavior tests. I’m not sure if it is really enterprise ready (do you use version 0.x?). Will this work with Oracle ADF development too? Have to check this as next opportunity.
Sven Ruppert (Macros Reply): Practical mutation testing
This seems to be the long searched key to find the right tests on the corner cases of our applications. I have mandatory to prove the mentioned PIT framework Very charismatic and tough presenter.
Roel Spilker (TOPdesk), Reinier Zwitserloot (medipc.nl): Lombok: The Boilerplate Buster. It’s a Kind of Magic!
Is this the way to hide generated and framework required code, like standard getters and setters, from the really interesting code, which implements my requirements? It is implemented as a java compiler plugin. Have to check immediately, if this will work with Oracle JDeveloper too. In Eclipse the structure shows the code of generated class, which contains the generated boilerplates via the lombok framework annotations. And what changes are required to fulfill now my static code analysis rules which work on the source code. Additional this was a very entertaining presentation.
Bert Jan Schrijver (JPoint): Continuous Performance: Automated Load Testing with Gatling
As our PoC of JMeter was not really satisfying especially for maintenance of test cases and the load testing should not cost anything at least at the moment, we should definitely this opensource tool a try. Especially the combination of the recorder and the presenter converter scripts to java looks promising. Maybe we could reuse the page object locators from our Selenium tests?
Hubert Klein Ikkink (JDriven): Writing Documentation with Asciidoctor Is Awesome
Focus on content instead of formatting in your documentation! With this tool it seem to be possible to really versioning and therefore to diff your documentation between commits. And still you can generate via templates modern output formats e.g. like HTML 5 or PDF. With a clever combination of features you can annotate your code with markers, to reuse this actual code between this markers in your documentation. And via ASCII art you can generate simple diagrams too. I will absolutely try this on my private projects soon.
Community Hall – Meet the libs
The motto was: show me your favorite opensource lib and I show your mine:
Sven Ruppert again – Proxybuilder: Change the behavior of deep code for different purposes of CDI eg. Metrics, Logging or testing. Maybe interesting for my future tests.
Roland Huß – Jolokia: JMX Bean access via JSON over HTTP, interesting but don’t know if I ever need this
? – Asciidoctor again: Jump additional over some of tool integrations
? – Keycloak: If I ever need a SSO or IDM solution for my private projects this will the first citizen in my tool chain.
? – Wildfly swarm: Interesting but actually I did not touch JBoss or Wildfly in my projects.
Generally very good food, I had not expected this here. At dinner I meet at my desk with some staff of canoo, which set up the voting machines at Javaland too. Nice and diverting talk, thank you guys!