A challenger appears!  Please give [biweekly][1] a try.  I&#39;m looking for lots of feedback on how it can be improved.


  [1]: https://github.com/mangstadt/biweekly

I had limited success with [iCal4j][1] ([intro][2]) on a project last year.

It seems to be a fairly popular choice for ical work in the java community. 

If I remember correctly the API can be slightly confusing at first glance.
However It&#39;s pretty solid in the long run.

Good luck, 
Brian 


  [1]: https://github.com/ical4j/ical4j
  [2]: http://ical4j.sourceforge.net/introduction.html


User equals untrustworthy. Never trust untrustworthy user&#39;s input. I get that. However, I am wondering when the best time to sanitize input is. For example, do you blindly store user input and then sanitize it whenever it is accessed/used, or do you sanitize the input immediately and then store this &quot;cleaned&quot; version? Maybe there are also some other approaches I haven&#39;t though of in addition to these. I am leaning more towards the first method, because any data that came from user input must still be approached cautiously, where the &quot;cleaned&quot; data might still unknowingly or accidentally be dangerous. Either way, what method do people think is best, and for what reasons?

When is it best to sanitize user input?

I&#39;m developing a Linux application that has its own file format. I want my app to open when you double-click on those files.

How can I register a file extension and associate it with my application on Linux? I&#39;m looking for a way that is standard (works with GNOME and KDE based systems) and can be done automatic when my program is installed or run for the first time.



Register file extensions / mime types in Linux

I&#39;m looking for a library to handle [iCalendar][1] data in Java.

Open source, well-documented implementations with a good object model are preferred.  iCal parsing capabilities are less important to me, but still nice to have.

Does anyone have any recommendations?

  [1]: http://en.wikipedia.org/wiki/ICalendar

Best iCalendar library for Java?

I'm looking for a library to handle <a href="http://en.wikipedia.org/wiki/ICalendar" target="_blank" rel="noopener noreferrer">iCalendar</a> data in Java.
Open source, well-documented implementations with a good object model are preferred. iCal parsing capabilities are less important to me, but still nice to have.
Does anyone have any recommendations?

I would like to know which dependency described in my pom.xml brings a transitive dependency in my target directory.

To be more precise, I have the library &quot;poi-2.5.1-final-20040804.jar&quot; in my WEB-INF/lib directory and I would like to know which dependency in my pom.xml brings that.

In Maven 2, how do I know from which dependency comes a transitive dependency?

I am getting a `NoClassDefFoundError` when I run my Java application.  What is typically the cause of this?

Why am I getting a NoClassDefFoundError in Java?

How do I use JUnit to test a class that has internal private methods, fields or nested classes?

It seems bad to change the access modifier for a method just to be able to run a test. 


How do I test a class that has private methods, fields or inner classes?

**Is there anything built into the core C# libraries that can give me an immutable Dictionary?**  

Something along the lines of *Java&#39;s*:

    Collections.unmodifiableMap(myMap);

And just to clarify, I am not looking to stop the keys / values themselves from being changed, just the structure of the Dictionary.  I want something that fails fast and loud if any of IDictionary&#39;s mutator methods are called (`Add, Remove, Clear`).

Does C# have a way of giving me an immutable Dictionary?

I&#39;m getting a `NoSuchMethodError` error when running my Java program.  What&#39;s wrong and how do I fix it?

How do I fix a NoSuchMethodError?

I&#39;m trying to figure out how to encode newlines in the DESCRIPTION part of an iCal file in such a way that they will import properly into Outlook, Google Calendar and the Apple Calendar.

The original code I inherited used &quot;=0D=0A&quot; with a quoted-printable encoding, which works great in Outlook, but not in Google Calendar.

The spec seems to say you should use &quot;\n&quot; to represent a newline.  This works great in Google Calendar, but Outlook just puts the literal &quot;\n&quot; characters in there.

Is there a way you&#39;ve done this that will work consistently accross calendaring systems?





Encoding newlines in iCal files

I want to send booking information through mail in an attachment to add in MS Outlook.
Which format is better? Especially for MS Outlook 2003?

Difference between iCalendar (.ics) and the vCalendar (.vcs)

Any Google search on PHP ical just brings up phpicalendar and how to parse or read IN ical files. I just want to write a PHP file that pulls events from my database and writes them out in ical format.

My problem is I can&#39;t find anywhere that will answer two questions:

 1. What is the *exact* ical format, including headers, file format, footers, etc.? In other words, what does the file have to have, exactly, in order to be properly read in by Google Calendar, etc.?
 2. If I build this file using a .php extension, how do I publish it as ical? Do I have to write to a new .ics file? Or will Google Calendar etc. read a .php file as ical so long as the contents are in the correct format? (Much like a style.css.php file will be read as a CSS file if the contents are actually CSS, etc.)

Any help you all can give or point me to will be greatly appreciated!!!



How can I use PHP to dynamically publish an ical file to be read by Google Calendar?

I&#39;m trying to extract a substring from a file with JavaScript Regex. Here is a slice from the file :

    DATE:20091201T220000
    SUMMARY:Dad&#39;s birthday

the field I want to extract is &quot;Summary&quot;. Here is the approach:

    extractSummary : function(iCalContent) {
      /*
      input : iCal file content
      return : Event summary
      */
      var arr = iCalContent.match(/^SUMMARY\:(.)*$/g);
      return(arr);
    }

How to extract a string using JavaScript Regex?

I have a .ics file in the following format. What is the best way to parse it? I need to retrieve the Summary, Description, and Time for each of the entries.

    BEGIN:VCALENDAR
    X-LOTUS-CHARSET:UTF-8
    VERSION:2.0
    PRODID:-//Lotus Development Corporation//NONSGML Notes 8.0//EN
    METHOD:PUBLISH
    BEGIN:VTIMEZONE
    TZID:India
    BEGIN:STANDARD
    DTSTART:19500101T020000
    TZOFFSETFROM:+0530
    TZOFFSETTO:+0530
    END:STANDARD
    END:VTIMEZONE
    BEGIN:VEVENT
    DTSTART;TZID=&quot;India&quot;:20100615T111500
    DTEND;TZID=&quot;India&quot;:20100615T121500
    TRANSP:OPAQUE
    DTSTAMP:20100713T071035Z
    CLASS:PUBLIC
    DESCRIPTION:Emails\nDarlene\n Murphy\nDr. Ferri\n
    
    UID:12D3901F0AD9E83E65257743001F2C9A-Lotus_Notes_Generated
    X-LOTUS-UPDATE-SEQ:1
    X-LOTUS-UPDATE-WISL:$S:1;$L:1;$B:1;$R:1;$E:1;$W:1;$O:1;$M:1
    X-LOTUS-NOTESVERSION:2
    X-LOTUS-APPTTYPE:0
    X-LOTUS-CHILD_UID:12D3901F0AD9E83E65257743001F2C9A
    END:VEVENT
    BEGIN:VEVENT
    DTSTART;TZID=&quot;India&quot;:20100628T130000
    DTEND;TZID=&quot;India&quot;:20100628T133000
    TRANSP:OPAQUE
    DTSTAMP:20100628T055408Z
    CLASS:PUBLIC
    DESCRIPTION:
    SUMMARY:smart energy management
    LOCATION:8778/92050462
    UID:07F96A3F1C9547366525775000203D96-Lotus_Notes_Generated
    X-LOTUS-UPDATE-SEQ:1
    X-LOTUS-UPDATE-WISL:$S:1;$L:1;$B:1;$R:1;$E:1;$W:1;$O:1;$M:1
    X-LOTUS-NOTESVERSION:2
    X-LOTUS-NOTICETYPE:A
    X-LOTUS-APPTTYPE:3
    X-LOTUS-CHILD_UID:07F96A3F1C9547366525775000203D96
    END:VEVENT
    BEGIN:VEVENT
    DTSTART;TZID=&quot;India&quot;:20100629T110000
    DTEND;TZID=&quot;India&quot;:20100629T120000
    TRANSP:OPAQUE
    DTSTAMP:20100713T071037Z
    CLASS:PUBLIC
    SUMMARY:meeting
    UID:6011DDDD659E49D765257751001D2B4B-Lotus_Notes_Generated
    X-LOTUS-UPDATE-SEQ:1
    X-LOTUS-UPDATE-WISL:$S:1;$L:1;$B:1;$R:1;$E:1;$W:1;$O:1;$M:1
    X-LOTUS-NOTESVERSION:2
    X-LOTUS-APPTTYPE:0
    X-LOTUS-CHILD_UID:6011DDDD659E49D765257751001D2B4B
    END:VEVENT

Content Type	Original Author	Original Content on Stackoverflow
Question	David Crow	View Question on Stackoverflow
Solution 1 - Java	Michael	View Answer on Stackoverflow
Solution 2 - Java	Brian Gianforcaro	View Answer on Stackoverflow

Best iCalendar library for Java?

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Register file extensions / mime types in Linux

When is it best to sanitize user input?

Attributions