Continue reading The name ‘Resource’ does not exist in the current context Well, playing with mono for Android is quite fun, until you run into very silly errors which kind of keep you stuck for hours before you come to know about the solution for them (Particularly, for people like me who seldom use .NET for programming).

The error: The name ‘Resource’ does not exist in the current context

The name 'Resource' does not exist in the current context

The Xamarin Developer Center suggests that the error is due to the namespace difference. But, for my case it was that I had changed the Build Action property in the Resource.Designer.cs and Activity1.cs files to “Compile”. This property needs be set to “None”!

The name 'Resource' does not exist in the current context FIXED

Continue reading Could not start a simulator – CPN Tools I was facing this wierd problem for the past couple of hours. The problem is that CPN Tools gives you very little debug information or something which I have not been able to figure out.

The specific problem that I was facing was, whenever I tried to load a net to the CPN Tools, it always gave the error:

Could not start a simulator

and the simulation process would not start. A snapshot of the error looks something like this:

CPN Tools UI - Could not start a simulator

1. Supported OS’es: XP/Vista/7 32-bit versions, Windows 7 (64-bit). Also supported Windows 8 (both 32-bit and 64-bit version)




2. CPN Tools 3.0 uses a new simulator that is not too happy about being installed in a location other than the default one, and especially not one with non-ASCII characters. I’m looking into the problem, but has no solution yet, so the suggested work-around is to install in c:/Program Files/CPN Tools.




3. The new simulator may also have problems with incompatible running installations of Cygwin. If you don’t have Cygwin installed, it should not be an issue. (Though you may have programs using Cygwin like CPN Tools without you knowing it; one of the nx distributions do that).




4. The problem may also be “old” simulator settings; check if CPN Tools is set to run with a remote simulator (in Options in the index; http://cpntools.org/documentation/gui/index/options though the page is not 100% up-to-date). The name of the simulator image has changed, so even if it says localhost, it may not work correctly if Remote is switched on. You can also try deleting the global settings file, preferences.xml from C:\Documents and Settings\USER\Application Data\CPN Tools or c:\Users\USER\AppData\Roaming\CPN Tools (the location changes a bit with Windows versions and the local setup). This was, in fact my problem. I guess I had stopped the CPNTools application abruptly in my prior run.




5. You can also try starting the simulator manually; go to the cpnsim sub-directory of the CPN Tools installation directory and run (from a console)
   .\cpnmld.x86-cygwin.exe -d 2098 .\run.x86-cygwin.exe
   then load your net and see if that helps; otherwise the console or the produce log file should give you hints as to what is wrong. You may also want to try absolute paths for both cpnmld.x86-cygwin.exe and run.x86-cygwin.exe.




6. Finally, one must ensure that cpntools runs under the administrative privileges. (i.e. Run CPNTools as adminitrator)

Continue reading JENAROOT not set When you are trying to run SPARQL query examples from the command-line, JENA complains you of JENAROOT not set. You can easily set the path either on the local command prompt window or on the system variables.

1. Set the path

C:\>set JENAROOT=C:\Users\PATH_TO_WHERE_YOU_HAVE_INSTALLED_OR_UNZIPPED_JENA


2. Verify if the path is set correctly

C:\>echo %JENAROOT%


3. You have solved your problem!

The snapshot of my command terminal is below:

JENAROOT not set

ERROR [main] (RDFDefaultErrorHandler.java:40) - file:///C:/Users/Ravi/Desktop/Jena-examples/(line 4 column 60): {E201} rdf:about

Continue reading org.xml.sax.SAXParseException: The prefix “vcard” for element “vcard:fn” is not bound. When you run the Tutorial05.java and onwards in the Jena examples, you get the following error:


ERROR [main] (RDFDefaultErrorHandler.java:40) - file:///C:/Users/Ravi/Desktop/Jena-examples/(line 4 column 60): {E201} rdf:about not allowed as attribute here.
ERROR [main] (RDFDefaultErrorHandler.java:44) - file:///C:/Users/Ravi/Desktop/Jena-examples/(line 5 column 15): The prefix "vcard" for element "vcard:fn" is not bound.
Exception in thread "main" com.hp.hpl.jena.shared.JenaException: org.xml.sax.SAXParseException: The prefix "vcard" for element "vcard:fn" is not bound.
at com.hp.hpl.jena.rdf.model.impl.RDFDefaultErrorHandler.fatalError(RDFDefaultErrorHandler.java:45)
at com.hp.hpl.jena.rdf.arp.impl.ARPSaxErrorHandler.fatalError(ARPSaxErrorHandler.java:35)
at com.hp.hpl.jena.rdf.arp.impl.XMLHandler.warning(XMLHandler.java:225)
at com.hp.hpl.jena.rdf.arp.impl.XMLHandler.fatalError(XMLHandler.java:255)
at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLNamespaceBinder.handleStartElement(Unknown Source)
at org.apache.xerces.impl.XMLNamespaceBinder.startElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at com.hp.hpl.jena.rdf.arp.impl.RDFXMLParser.parse(RDFXMLParser.java:142)

SOLUTION
This is very wierd, but the rdf (vc-db-1.rdf), which I obtained from the internet, seems to contain two different instances for vcard: viz, “vcard” and “vCard”. The namespace for “vCard” seems to be defined but “vcard” not defined. So, the solution might be just name all vcards consistently to a single name such as “vcard”.

And later I found that vc-db-1.rdf obtained from vc-db-1.rdf was not correct, and that file that the example needs is located in directory doc/tutorial/RDQL folder. Thanks to we8ver

Continue reading Parse error. There is a problem parsing the package. Recently, when I developed an simple android application for version 3.0 (API 11) and tried to run this on version 2.3, I got this wierd problem. The error looks something like:


Parse error.

There is a problem parsing the package.


The solution to this problem was to specify the minSdkVersion to a version on which you are trying to run the application. In my case version 2.3.

Solution:
Edit your manifest file which contains the line


uses-sdk android:minSdkVersion="11"


to


uses-sdk android:minSdkVersion="7"


or whatever is preferrable for you.

The most distinctly visible coding

Continue reading Java 7, What’s new? So, finally the much awaited Java 7 has finally been released. The official version of the software can be downloaded here.

The most distinctly visible coding enhancements that differentiate Java 7 are:

Automatic Resource Management

Some resources in Java need to be closed manually like InputStream, Writers, Sockets, Sql classes. This language feature allows the try statement itself to declare one of more resources. These resources are scoped to the try block and are closed automatically.
This:

BufferedReader br = new BufferedReader(new FileReader(path));
try {
   return br.readLine();
} finally {
   br.close();
}

becomes:

try (BufferedReader br = new BufferedReader(new FileReader(path)) {
   return br.readLine();
}

You can declare more than one resource to close:

try (
   InputStream in = new FileInputStream(src);
   OutputStream out = new FileOutputStream(dest))
{
 // code
}

To support this behaviour all closable classes will be retro-fitted to implement a Closable interface.
Improved Type Inference for Generic Instance Creation (diamond)

This is a particular annoyance which is best served with an example:

Map> anagrams = new HashMap>();

becomes:

Map> anagrams = new HashMap<>();

This is called the diamond operator: <> which infers the type from the reference declaration.

Underscores in numeric literals

Long numbers are hard to read. You can now split them up using an underscore in ints and longs:

int one_million = 1_000_000;

Strings in switch

Currently you can only use numbers or enums in switch statements. String has been added as a candidate:

String s = ...
switch(s) {
 case "quux":
    processQuux(s);
    // fall-through

  case "foo":
  case "bar":
    processFooOrBar(s);
    break;

  case "baz":
     processBaz(s);
    // fall-through

  default:
    processDefault(s);
    break;
}

Binary literals

Java code, due to its C heritage, has traditionally forced programmers to represent numbers in only decimal, octal, or hexadecimal.
As quite a few domains are bit orientated, this restriction can introduce errors. You can now create binary numbers using an 0b prefix.

int binary = 0b1001_1001;

Simplified Varargs Method Invocation

When a programmer tries to invoke a *varargs* (variable arity) method with a non-reifiable varargs type, the compiler currently generates an “unsafe operation” warning. JDK 7 moves the warning from the call site to the method declaration. This will enable API designers to use varargs due to the reduction of warnings reported.
This one is slightly more involved so you are better off looking at the proposal.

References:
http://en.wikipedia.org/wiki/Java_version_history
http://code.joejag.com/2009/new-language-features-in-java-7/
http://openjdk.java.net/projects/jdk7/features/

Continue reading India versus Pakistan at Mohali The semi-final match between india and pakistan would be very interesting and the tickets are being sold like hot cakes.The traditional rivals will play against each otther on 30th march,2011 wednesday.The excitement between cricket fans is sky high.The match is scheduled to begin at 14:30 local time.

The green shirts won Group A with 10 points beating kenya,sri lanka,canada,zimbabwe,australia losing only to new zealand by 110 runs.In their first quarter final against west indies they won easily by 10 wickets.

Men in blue were second in their pool.Their world cup campaign started in glistering style making 370 in their first match.Only the weak link in indain line up is their bowling.Only zaheer and yuvraj is in peak of the form in balling department.Terminator have lost the habit of taking crucial wickets.they lost thir only pool game against south africa.Team india ended the campaign of defending campion by 5 wickets in the other quarter final of the mega event.

So far, 119 matches have been played between Pakistan and India, and green shirts are leading the victories with 69-46 while four matches ended without any result. Blue shirts have a 4-0 head-to-head record against Pakistan in World Cup matches.

Continue reading Happy Pi Day We all know what significance PI has in mathematics. Commemorating this, PI day is celebrated on 3/14 every year, as the date signifies the first 3 digits of the special number. As can be guessed, there is a PI Approximation Day as well, 22/7 celebrated on July 22nd each year. Apart from this, PI also has a wonderful musical interpretation to it. This video depicts this, Hats off to the creator.