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Latest 7 Posts
Quick-n-Dirty: Hotfix for DateTimeHelper
Mon, Jun 12th 2017 5
High Performance REST Applications (4) – Looking into OSGi
Thu, May 4th 2017 13
High Performance REST Applications (3) – Importing the Starter Project
Mon, Apr 24th 2017 7
High Performance REST Applications (2) – Dev Environment
Sun, Apr 23rd 2017 2
High Performance REST Applications (1) – Intro
Fri, Apr 21st 2017 4
Re: Domino REST performance analysis
Thu, Mar 16th 2017 6
Domino & Java 1.8: Thank you, IBM!
Tue, Mar 14th 2017 7
Top 10
High Performance REST Applications (4) – Looking into OSGi
Thu, May 4th 2017 13
HowTo: Vaadin on Domino (2)
Sat, Jan 24th 2015 12
XPages: WebContent Files (3) – Create a Minimizer Servlet
Thu, Nov 27th 2014 11
Testing XPages
Wed, Sep 16th 2015 10
Aus aktuellem Anlass: Quo vadis, Domino?
Thu, Aug 25th 2016 10
Hardening SSH vs. Eclipse RSE
Tue, Jan 13th 2015 9
DomiNodeJS: Node.js on Domino
Fri, Aug 26th 2016 9
XPages: Execute Events with HTTP Get
Tue, Sep 30th 2014 8
Security: Usefull HTTP Response Headers
Wed, Jan 14th 2015 8
Vaadin In XPages: A UIComponent for embedding Vaadin applications
Tue, May 3rd 2016 8

Sven Hasselbach
Blog Title blog@hasselba.ch
Blog URL http://blog.hasselba.ch
RSS Feed http://hasselba.ch/blog/?feed=rss2
Validate Feed feedvalidator.org or validator.w3.org
Feed Last Checked Jun 12, 2017 3:06:14 PM EST. Realtime Update:
Location Wiesbaden, Hessen, Germany

Recent Blog Posts
Quick-n-Dirty: Hotfix for DateTimeHelper
Mon, Jun 12th 2017 3:04p   Sven Hasselbach
This weekend I stumbled over a bug of the DateTimeHelper: If the value of the field is empty, no actions and/or action listeners connected with a managed bean will be executed anymore. Here is an example of a small XPage to illustrate the problem: It does not matter if you set the disableValidators property for the text field to true, even an immediate=true won’t help here. The reason for the problem is that the renderer of the dateTimeHelper al
High Performance REST Applications (4) – Looking into OSGi
Thu, May 4th 2017 9:41a   Sven Hasselbach
Before going any deeper into the the servlet project, let’s have a look at the imported projects and talk about some OSGi basics. First you will notice that for every cloned repository three Eclipse projects have been imported: A plugin project A feature project An updatesite project The plugin project contains the code and all the relevant resources of the servlet. It defines extension points provided or describes which extension points are used by the plugin. A feature project is basi
High Performance REST Applications (3) – Importing the Starter Project
Mon, Apr 24th 2017 9:03a   Sven Hasselbach
Now you can import the projects required from Git. First, go to „File > Import…“ Import Project Then select „Projects from Git“ Projects from Git and „Clone URI“ to clone an existing repository: Clone existing respository To get the URI, you have to open https://github.com/hasselbach/ and select the repository „ch.hasselba.concurrent„. Click the „Clone or download„-Button and copy the URI from the opening box: Get the repositor
High Performance REST Applications (2) – Dev Environment
Sun, Apr 23rd 2017 8:55a   Sven Hasselbach
Before you can start developing a Servlet as an OSGi Plugins, you must set up a development environment first. To do this, download Eclipse IDE (Eclipse IDE for Java EE Developers) and XPages SDK from OpenNTF (The XPages SDK is a helper to create the JRE environment and the Target Platform). For development it is the best to have a (local) development server, because during development you might want to restart and/or modify it, and debugging is a lot easier if have control over the whole server
High Performance REST Applications (1) – Intro
Fri, Apr 21st 2017 9:33a   Sven Hasselbach
This is a new serie about developing high performance REST applications on top of Domino. It will contain my presentations from SNoUG and EntwicklerCamp this year and descripe all required steps to develop, build and deploy these servlets on a basic level. The code used in this serie is already available at GitHub: https://github.com/hasselbach/domino-rest-servlet/tree/highperformance https://github.com/hasselbach/ch.hasselba.concurrent (The high performance part is in a branch of my example D
Re: Domino REST performance analysis
Thu, Mar 16th 2017 8:51p   Sven Hasselbach
I have created a Quick-n-Dirty performance test for Csaba’s „10K record test“: Loading time 200 ms overall, 60 ms TTFB. Do you want to know how this works? Feel free to come to SNoUG next week or to Rudi’s EntwicklerCamp and join my sessions.
Domino & Java 1.8: Thank you, IBM!
Tue, Mar 14th 2017 1:16p   Sven Hasselbach
For years it was a lot of pain when developing for the Domino platform using Java 1.6 only. But now, Java 1.8 is available, and this allows to use the latest versions for a lot of libraries and development tools. After installing FP8 to the Client, Eclipse allowes to use the Domino JRE in a JavaSE-1.8 environment: This gives access to the latest M2Eclipse plugin (1.7.0). The old version problem when running with JRE 1.6… … is solved: Eclipse Updates? No problem, just do it! Latest
Domin & REST: Debug your Plugin
Tue, Mar 7th 2017 11:14a   Sven Hasselbach
When developing OSGi Plugins, you should have your own development server running on your local machine. Not only because of the faster deployment of changes (a new version of a plugin must always deployed with a HTTP restart), but because of the Java debugging posibilities: Only one Eclipse instance can connect to the JVM, and every request processed by the server will start the debugger. If multiple users a accessing the server while you are debugging, your Eclipse will try to debug every inco
Domino & REST: More about Jackson
Fri, Mar 3rd 2017 10:16a   Sven Hasselbach
When creating a REST API servlet, Jackson provides a huge list of possibilities to manipulate the JSON data, mostly using annotations. Let’s demonstrate some of them with this little class, which has only two properties: public class Demo { private String foo; private String bar; public String getFoo() { return foo; } public void setFoo(String foo) { this.foo = foo; } public String getBar() { return bar; } public void setBar(String bar) { this.bar = ba
Domino & REST: Accessing Domino’s Environment / Check Authentication
Thu, Mar 2nd 2017 11:00a   Sven Hasselbach
If we want to access Domino’s Environment, it is the ContextInfo class which gives us all we need. Everything you need to do to use the class is described in an earlier blog post. The class gives mainly access to the following methods: Method Description getDataDirectory() Path to notes data directory getEnvironmentString(String envName) Returns the environment variable getServerDatabase() The actual database as NAPI object, if any getServerVariable(String varName) Variables
Domino & REST: Consuming JSON
Wed, Mar 1st 2017 7:25a   Sven Hasselbach
Consuming JSON is as easy as pie: Just create a new method to the RestApiServlet,  add a @POST annotation, and declare the object you want to the parameters of the method:     @POST     @Path("/helloworld/")     @Consumes(MediaType.APPLICATION_JSON)     public Response postHelloWorld(HelloWorld helloWorld) {         return Response.ok(helloWorld, MediaType.APPLICATION_JSON).build();     } In this example we are using the same URI „/helloworld/„; because
Domino & REST: A basic Servlet
Tue, Feb 28th 2017 1:49p   Sven Hasselbach
To have a good starting point when creating RESTful applications on top of Domino, I have created a „Hello World“ example of a JEE Application, based on Apache Wink & Jackson 2.5.0. The Jackson AnnotaionProcessor is registered into Apache Wink application and is enabled by default, the JAXB processor is also included as the secondary AnnotationProcessor. The benefit of this is that only one global ObjectMapper instance is created and is reused, wich allows a better performance as
Domino & REST: Listeners for Initialization & Destroying of a Servlet
Mon, Feb 27th 2017 9:15a   Sven Hasselbach
If you need to know when your Servlet is initialized or destroyed, you can use a ServletContextListener in your application. First, create the class AppServletContextListener and implement the javax.servlet.ServletContextListener interface. This provides two methods for capturing the events: contextInitialized and contextDestroyed: package ch.hasselba.servlet; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; public class AppServletContextListener  
Jackson: Skip Objects conditionally
Wed, Feb 8th 2017 7:51a   Sven Hasselbach
I had a simple problem when implementing this brilliant solution in one of my REST applications: As soon I was using @JsonAnyGetter / @JsonAnySetter and the HidableSerializer together, a NPE was thrown during serialization. The Problem occured in Jackson 1.9.13 and even 2.5.0, the latest version usable with the actual Domino JVM. Stack Trace org.codehaus.jackson.map.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: ch.hasselba.Test["[anySetter]"]) null  
Entwicklercamp 2017: Meine Vorträge & Hands-On
Thu, Jan 19th 2017 7:51a   Sven Hasselbach
Dieses Jahr spreche ich wieder auf dem Entwicklercamp, und halte neben den Vorträgen auch noch eine Hands-On Session: Track 1 – Session 2: XPages erweitern und ausbauen – Ausgabe 2017 Im Laufe des Jahres 2016 kamen einige Themen hinzu, und dank FP8 wird es wohl auch einige Neuerungen geben, über die man mal reden müsste… Track 4 – Session 3: High-Performance REST Applications Hochperformante REST Schnittstellen entwickeln, die auf dem Domino Server laufen? Der Vor
SNoUG 2017: Hochperformante REST Schnittstellen für Domino
Tue, Jan 17th 2017 1:40p   Sven Hasselbach
Dieses Jahr spreche ich zum ersten Mal auf der SNoUG am 22. März diesen Jahres. Wie der Name des Vortrages vermuten lässt, geht es um die Entwicklung hochperformanter REST Schnittstellen auf dem Domino Server, und der gesammelten Erfahrungen der letzten Jahre. Es ehrt mich, auf diese kleine, aber feine Konferenz eingeladen worden zu sein, und ich freue mich auf weitere interessante Vorträge hochkarätiger Sprecher. Zur Registrierung geht es hier entlang.

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