Ghostscript and Java

I recently experienced problem printing from my java app using ghostscript. The error message is here:

 D [17/Dec/2005:14:25:48 +0700] [Job 54] Error: /configurationerror in --setpagedevice-- D [17/Dec/2005:14:25:48 +0700] [Job 54] Additional information: [/ManualFeed false]  

After hours searching, I finally found the solution.
It is in /usr/share/ghostscript/8.15/lib/gs_setpd.ps
Here is the diff

 --- gs_setpd.ps.bak     2005-12-17 14:30:23.000000000 +0700 +++ gs_setpd.ps 2005-12-17 14:31:49.000000000 +0700 @@ -171,10 +171,10 @@    % the default policy to "7" (impose) to avoid numerous problems with    % printing within CUPS...    % -  % /PolicyNotFound 1 -  % /PageSize 0 -  /PolicyNotFound 7 -  /PageSize 7 +  /PolicyNotFound 1 +  /PageSize 0 +  % /PolicyNotFound 7 +  % /PageSize 7    /PolicyReport {      dup /.LockSafetyParams known {         % Only possible error is invalidaccess  

Mandriva 2006

I upgraded my and my clients PCs to Mandriva 2006 PowerPack. It is
fantastic. Shorter boot time, look and feel, and the list grows. I
copied the CDs' contents to my harddisk then invoked urpmi.addmedia
--distrib, and then urpmi --auto-select. It worked like charm.

But...

There is one disappointment. There is no postgresql-server package. I
was forced to download it manually.

FasterFox Break

Recently I discovered that FasterFox extension located in mozilla break
WebWork's token mechanism.
It appears that FasterFox caused the lines

public static String setToken(String tokenName, HttpServletRequest
request) {
HttpSession session = request.getSession(true);
String token = GUID.generateGUID();
session.setAttribute(tokenName, token);

return token;
}

in TokenHelper to be executed twice. This make the token saved in the
session differs to those rendered in the page. As a result,
invalid.token is always returned thus disabling user from using forms.

Found Resin Xml Bug Revisited

After I wrote my blog titled Found Resin Xml Bug (http://tew.blogspot.com/2005/09/found-resin-xml-bug.html), I discovered that it only applies to JDK 1.4. Things are different in 1.5.
Here it is:

 	<system-property javax.xml.parsers.DocumentBuilderFactory= 				 "com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl"/> 	<system-property javax.xml.parsers.SAXParserFactory= 				 "com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl"/> 

Solitaire is Deadlock-Prone

Solitaire is one of my favorite games. Recently, I discovered that it is
deadlock-prone. Why? I think you who have ever played it have noticed
it. Sometimes I cannot make any progress and is forced to give up the
game session because one or more important cards are buried.

I think this is interesting because people tend to use Philosopher to
explain deadlock.

PS: I use PySol in Linux for playing. PySol contains several games. The
game I play is Klondike.

Samsung CD Writer and K3B

I experienced weird things when writing CD using K3B. The verification
always fails when I use cdrecord in DAO mode. I tried RAW mode and
suprprisingly it succeeded.

Found Resin Xml Bug

I've finally fixed bug which plagued my project for some time. The bug causes FileSystemPreferences to throw warning messages like this:
Couldn't flush user prefs: java.util.prefs.BackingStoreException: java.lang.NullPointerException
every 30 seconds.
This is happened on Resin 3.0.13. I fixed this by adding the following lines into my resin-web.xml.

<system-property
    javax.xml.parsers.DocumentBuilderFactory=
        "org.apache.crimson.jaxp.DocumentBuilderFactoryImpl"/>
<system-property
    javax.xml.parsers.SAXParserFactory=
        "org.apache.crimson.jaxp.SAXParserFactoryImpl"/>

The NPE is thrown on the line 321 of java.util.prefs.XmlSupport

319 | Element xmlMap = (Element) doc.getChildNodes().item(1);
                                       returns null  ^^^
320 | // check version
321 | String mapVersion = xmlMap.getAttribute("MAP_XML_VERSION");

Resin xml implementation would behave correctly if item(1) was modified to item(0). After several considerations I decide to stop using resin xml implementation in favor of default JDK 1.4 xml instead of creating my own implementation of Preferences.

Hard Time Working with Webwork's altSyntax

Actually I have hard time working with Webwork's altSyntax. It is %{} that caused me headache. I have to check whether the getValueClassType() return String or not. To me it's inconsistent. I'm more willing to put %{} every where when I need OGNL than checking individual tag;s value class type.

Migration to WebWork altSyntax

Today I've just migrated my WebWork application to altSyntax. My IDEA made this job painless. I just replaced with regular expression "'|'" to  ". Then I enclosed some parameter values with %{...}. I just realized that hidden, textfield, label, and textarea tags need their value parameter enclosed with %{...} opposed to those of checkbox, checkbox list, radio, and select tags which do not so.
Also, param tags still need the "''" if you want to pass String values.

Indonesian IzPack

Today I created an Indonesian translation of IzPack. IzPack is a free installer. I am now submitting this translation to the IzPack team.