Martin Pradny's blog

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Getting Notes db/template version faster

While doing XPages application performance optimization, I discovered that one of the slowest parts was reading the template version and build date. I've never paid much attention to this code, so it surprised me.

XPages EL/class-loader memory leak (now with solution)

We have recently experienced OutOfMemory crashes of XPages app server. The server was recently upgraded to 12.0.1FP1, but we were getting some panic crashes in HTTP even before the upgrade (it was 9.0.1FP10). Our hopes were that the upgrade would stabilize the server, but it's not the case. At least now I start to see what's the problem. update 8.12.2022 There were actually 3 different leaks. I have rewritten the article to be a bit more clear. I also re-run some of the tests on 9.0.1FP10, so I assume the problems are also in earlier versions. Problem 1 The server is hosting over 1000 NSF sharing the same design + some other custom apps. Not all NSFs are used via web as the app still has classic Notes UI in parallel, so it's a bit tricky to estimate the load. By using tell http xsp show modules I usually see around 350 NSFs active. We kept the default application timeout that should provide reasonable application recycling if it's not used continuously. We started to...

HCL Domino 12.0.2, Engage 2022 and HCL Factory tour Milan

I haven't published my recap after Engage this year and the recent HCL Factory tour in Milan is a great opportunity to write a summary about what's happening in HCL (mostly Domino) space. It's a mix of news about 12.0.2, future directions, and my impressions, so it can be a bit chaotic, but I got the impression that many people see it similarly. Engage 2022 Engage 2022 was great (as always). I love the atmosphere in Brudges. I visited it once after Engage a few years ago and I was happy to come back. This was also the first time I had the opportunity to speak at Engage, which obviously made it a bit more stressful, but also more fun. Together with Domino Jams, HCL continued conversations with customers and partners about the future of their products at Engage. Many of these ideas were now discussed in greater detail in Milan, some of them were even demoed. My main takeaways from Engage were: Nomad (web and mobile) are a great addition to Notes family Restyle is a great...

XPages and RichText (part I) - ACF

This post is long overdue. I originally planned to write it to document the issues and solutions while working on the app, but as the problems kept appearing I wanted to make sure that I have all the answers. Now I know that I probably won't have them in the near future as I'm seeing new issues even after having the app in production for some time. The project was about a webization of an existing app that served well in Notes client UI for many years. It's a classic support/helpdesk app that once used to be a great example of Notes flexibility and integration of mail functions with app code. After all the mail database was just another app using the same APIs (mostly). Unfortunately, this is not the case for XPages as iNotes or Verse has nothing in common with XPages, so the APIs are not battle-tested for all the scenarios. I remember doing a similar project during the early days of XPages and I must admit that it was more painful, but mostly due to a lack of community ...

HCL Domino 12.0.1 Comparison tool quick-fix for XSP

I finally found an opportunity to try the new Database comparison tool that comes with 12.0.1 - official documentation . Unfortunately, it did not work for me - all I got was a report for database.xml comparison and an error: Unable to output because no output object has been specified //DDDESIGNELEM.SAVE:1184-6 ... cc_body_xsp.xml ... My setup is: 12.0.1 - of course on Windows database configured to use WinMerge for comparison The error mentioned a Custom Control and the code contains a special if for *.xsp. After a bit of checking of the source code it seems that my problem can be fixed with a simple line that sets the output of the midDomp object - line 1117 on the screenshot. Now it outputs results for all elements and no errors anymore. Now I can continue to check the reports. Update: There is an official support article for this problem - https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0096095 (but without a fix)

Quick Tip - SSJS Error line numbers

Recently, I had to work on an app with a pretty huge server-side JavaScript codebase. Several developers with different levels of XPages knowledge worked on that project in the past, to the code is quite hard to follow. My suggestion to rewrite all the code to Java was not accepted, so we have to deal with SSJS for now. One of the most annoying things, when you work with SSJS, is that in many cases you don't know where an error is happening. If you keep things simple and allow redirection to an error page (default or custom), you get a lot of information, and usually, you don't want to scare users with that or you may even want to do something useful in a catch block to recover from the problem. If the problem is thrown directly in the XPages JS engine, it's usually an InterpretException, which contains the context information, but if you have to deal with standard Java exceptions, you don't have it. Imagine a simple scenario with a function in a ssjs lib. When you run...