This page (revision-90) was last changed on 24-Feb-2016 11:06 by Albrecht Striffler

This page was created on 20-Nov-2012 15:45 by UnknownAuthor

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Version Date Modified Size Author Changes ... Change note
90 24-Feb-2016 11:06 9 KB Albrecht Striffler to previous
89 15-May-2014 09:33 9 KB Volker Belli to previous | to last
88 15-May-2014 09:32 9 KB Volker Belli to previous | to last
87 15-May-2014 09:30 9 KB Volker Belli to previous | to last
86 21-Jun-2013 15:09 8 KB Jochen Reutelshöfer to previous | to last
85 21-Jun-2013 15:08 8 KB Jochen Reutelshöfer to previous | to last
84 21-Dec-2012 16:15 7 KB Jochen Reutelshöfer to previous | to last
83 21-Dec-2012 16:14 7 KB Jochen Reutelshöfer to previous | to last
82 18-Dec-2012 17:47 7 KB Alex Legler to previous | to last Fix Image link URL
81 17-Dec-2012 21:33 7 KB CarstenWasner to previous | to last

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Developer FAQ
Developer FAQ

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This Page is supposed to help you getting started with the development of KnowWE. Feel free to add your Solutions to this page. If you don't find the Informations you need here, you can post it in the [Forum|http://sourceforge.net/projects/knowwe/forums].
This page is supposed to help you getting started with the development of KnowWE. Feel free to add your solutions to this page. If you don't find the information you need here, you can post it in the [Forum|http://sourceforge.net/projects/knowwe/forums].
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A Plugin is a module extending KnowWE's functionality. A plugin needs a [Meaning%20of%20plugin.xml] file defining the Extensions for this plugin.
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A plugin is a module extending KnowWE's functionality. A plugin needs a [plugin.xml|Meaning of plugin.xml] file defining the extensions for this plugin.
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An Extension implements the plugin's functionality using an Extension Point. For further definition and usage instructions see [this page|http://denkbares.dyndns.org/d3web/Wiki.jsp?page=How-To%20Extension%20Points]..
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!What is the Scope of an extension?
An extension implements the plugin's functionality using an extension point. For further definition and usage instructions see [this page|How-To Extension Points]..
!What is the Scope of an Extension?
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The scope is a path of those KDOM node types that should be matched/selected. The path can be relative (anywhere in the KDOM tree) or root based. Specific path wildcards as "*" and "**" are allowed. The different kinds of Scopes and their usage are explained [here|http://denkbares.dyndns.org/d3web/Wiki.jsp?page=How-To%20Extension%20Points].
The scope is a path of those KDOM node types that should be matched/selected. The path can be relative (anywhere in the KDOM tree) or root based. Specific path wildcards as "*" and "**" are allowed. The different kinds of scopes and their usage are explained [here|How-To Extension Points].
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An Extension Point has a specific type, for example ''Action, TagHandler, TypeHandler'' or ''EventListener''. The defined extension point specifies that each extension has to give values for class, name, description, version, and priority. This has to be defined by each extension point; an extension point further can require additional value, for example the specification of a file name.
For further definition and usage instructions see [this page|http://denkbares.dyndns.org/d3web/Wiki.jsp?page=How-To%20Extension%20Points].
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An extension point has a specific type, for example ''Action, TagHandler, TypeHandler'' or ''EventListener''. The defined extension point specifies that each extension has to give values for class, name, description, version, and priority. This has to be defined by each extension point; an extension point further can require additional value, for example the specification of a file name.
For further definition and usage instructions see [this page|How-To Extension Points].
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!Why isn't Plugin X included in my Build?
[{Image src='attach/Developer%20FAQ/m2eclipse-plugins.png' width='232' height='202' align='right' link='http://denkbares.dyndns.org/d3web/attach/Developer%20FAQ/m2eclipse-plugins.png'}]
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!Why isn't Plugin X included in my build?
[{Image src='attach/Developer%20FAQ/m2eclipse-plugins.png' width='232' height='202' align='right' link='attach/Developer%20FAQ/m2eclipse-plugins.png'}]
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! What do I have to mind about the licence?
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! What do I have to mind about the license?
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! Whats important about the first check-in?
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! What is important about the first check-in?
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You don't have to worry that you changes will be lost after you shut down KnowWE. To make the changes effective for the next restart, you have to perform Maven Install on KnowWE-App.
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You don't have to worry that you changes will be lost after you shut down KnowWE. To make the changes effective for the next restart, you have to perform Maven install on KnowWE-App.
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*Perform a Maven Install on KnowWE-App and
*Perform a Maven install on KnowWE-App and
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Unfortunately, there is no Hot Code Replacement for Non-Java files. However, there is a [How-To for developing Javascript at runtime|http://denkbares.dyndns.org/d3web/Wiki.jsp?page=How-To%20Develop%20JavaScript%20in%20KnowWE], which may be useful for you.
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Unfortunately, there is no Hot Code Replacement for Non-Java files. However, there is a [How-To for developing Javascript at runtime|How-To Develop JavaScript in KnowWE], which may be useful for you.
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This can happen when you perform a Maven Install while Tomcat is still running. To fix this, you have to follow these steps:
This can happen when you perform a Maven install while Tomcat is still running. To fix this, you have to follow these steps:
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! Why cannot my JUnit tests be executed?
If the message appears 'dependencies/output.txt not found' read further in this [howto|How-To Initialize Plugin Manager for JUnit Tests].
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Create a second runtime configuration for building KnowWE, just like shown here: [http://d3webwiki.informatik.uni-wuerzburg.de/Wiki.jsp?page=Workspace#section-Workspace-CreateARunConfigurationForBuildingTheWiki], just check the "Offline" checkbox. __Note__: Do not enable this option for your regular build, only use it if Artifactory is down or you are not connected to the internet!
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Create a second runtime configuration for building KnowWE, just like shown here: [http://d3webwiki.informatik.uni-wuerzburg.de/Wiki.jsp?page=Workspace#section-Workspace-CreateARunConfigurationForBuildingTheWiki], just check the "Offline" checkbox. __Note__: Do not enable this option for your regular build, only use it if artifactory is down or you are not connected to the internet!
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! Why are Umlauts viewed uncorrectly?
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Tomcat can be configured in UTF-8 to handle Umlauts correctlty. Look at [http://www.jspwiki.org/wiki/BugProblemsWithGermanUmlaute]
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!Why does Eclipse not catch breakpoints?
This Issue is caused by an outdated JDK. Please update your JDK to the [latest Version | http://www.oracle.com/technetwork/java/javaee/downloads/index.html].
! Why are Umlauts viewed uncorrectly?
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!Why do i get a java.util.MissingResourceException: Can't find bundle for base name Exception?
This happens after cleaning the workspace.
Tomcat can be configured in UTF-8 to handle Umlauts correctly. Look at [http://www.jspwiki.org/wiki/BugProblemsWithGermanUmlaute]
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For each of the two maven super projects (d3web, d3web-KnowWE), select the project, right click on it, "Run as...", "Maven package".
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This Issue is caused by an outdated JDK. Please update your JDK to the [latest Version | http://www.oracle.com/technetwork/java/javaee/downloads/index.html].
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This issue is caused by an outdated JDK. Please update your JDK to the [latest version | http://www.oracle.com/technetwork/java/javaee/downloads/index.html].
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What... ? and Why...? Questions\\
Coordinate with How-To
!Why do i get a java.util.MissingResourceException: Can't find bundle for base name Exception?
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%%Todo
Set this page up, add table of contents and some introductory words. Every question is its own small headline with the answer directly below.
This happens after cleaning the workspace.
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@user: Christian Henniger
%
For each of the two maven super projects (d3web, d3web-KnowWE), select the project, right click on it, "Run as...", "Maven package".
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%%Todo
Developer FAQ
* Define questions
* Answer questions, get the information if unkown
* Get and update/improve stuff from old pages: [http://d3webwiki.informatik.uni-wuerzburg.de/Wiki.jsp?page=FAQ]
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@user: Christian Henniger
%
! INFO: ERROR: Failed to create a Wiki engine: JSPWiki: Unable to load and setup properties from jspwiki.properties.
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%%Todo
Developer FAQ
* Some examples:
** What do I need do mvn install, after I change a java file or non-java file?
** Tomcat starts, but wikipages are not loaded -> update Tomcat-Context... this happens when mvn installing while tomcat is running...
** What is an plugin, what is an extension, what is an extension point ([http://d3webwiki.informatik.uni-wuerzburg.de/Wiki.jsp?page=Plugins%20and%20Extensions])
** What is the Scope of an extension
This is a missleading message display caused by unprecise error handling within jspwiki initialization code. The try-catch does not only include reading of the jspwiki.properties file, but also initialization of plugins/filters, i.e. also entire initialisiation of KnowWE. If you have recently changed code of KnowWE or a KnowWE-Plugin this error __most likely__ has __nothing__ to do with the jspwiki.properties file. It can be any kind of exception happening during KnowWE initialization. After the ''Unable to load and setup properties from jspwiki.properties'' the ''e.getMessage()'' of the actual exception is shown (without stack-trace unfortunately). __Tipp:__ Check the message string to guess what kind of exception it might have been; Consider your latest code changes; if nothing helps start debugging, e.g. in ''Environment.initInstance()''
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@user: Daniel Zügner
%
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! Are d3web's Session objects thread-safe for multi-threaded environments?
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In general a single d3web session is not thread-safe for write access. Reading contents from the same session with multiple threads is ok. But having an applications where multiple threads simultaneously read/write to a session, they need to be synchronized. Even if there is only one thread that writes to the session, it need to be synchronized with all reading threads. By convention, in d3web this should be done using the "Session"-Object as the semaphore for synchronization. This makes sure that your code will be interoperable with all other applications code (also considering this convention), without being in danger to create deadlocks.
%%prettify
{{{
// put your non d3web-code here
// ...
synchronized (session) {
// your read/write access to the session or blackboard or ... here
// ...
}
}}}
/%
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FAQ
FAQ Developer
This page (revision-90) was last changed on 24-Feb-2016 11:06 by Albrecht Striffler Top