This week's giveaway is in the Android forum.
We're giving away four copies of Android Security Essentials Live Lessons and have Godfrey Nolan on-line!
See this thread for details.
The moose likes Other JSE/JEE APIs and the fly likes Reading NFC Tag using JAVA Smart Card API not working on MAC OS Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of Android Security Essentials Live Lessons this week in the Android forum!
JavaRanch » Java Forums » Java » Other JSE/JEE APIs
Bookmark "Reading NFC Tag using JAVA Smart Card API not working on MAC OS" Watch "Reading NFC Tag using JAVA Smart Card API not working on MAC OS" New topic
Author

Reading NFC Tag using JAVA Smart Card API not working on MAC OS

Stral Test
Greenhorn

Joined: Nov 19, 2013
Posts: 1
Hello,

I am developing an application to read a NFC Tag UID from NFC Reader (ACR122U-A9) device.
I used JAVA and javax.smartcardio API to detect the NFC Reader and Reading NFC Tag.

The functionality of the application is to display notification when the NFC Reader device is connect or disconnect from PC. Then if the device is connected and NFC Tag is presented then display the notification that NFC Tag is presented.
I tried to find the Event based api to implement above functionality but I cannot found so I used Java Timer and Polling for the NFC Reader Device and NFC Tag.

Following is my sample JAVA code that used for Polling for NFC device and Tag.






Above code is working fine in Windows OS but when I run it on MAC OS then application runs for 5-10 seconds perfectly but then it suddenly crash with the following memory error.

java(921,0x10b0c3000) malloc: *** mmap(size=140350941302784) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
Java Result: 139


I searched on internet and cannot find anything regarding above memory error. When I contact ACS for same then they told me that the error message is not related to reader or card connection. It has something to do with memory management.

I already wrote the code for memory management to release the object when it is used in timer by assigning NULL value to it.

I used http://ludovicrousseau.blogspot.com/2010/06/pcsc-sample-in-java.html for reference
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Reading NFC Tag using JAVA Smart Card API not working on MAC OS
 
Similar Threads
iText: Digital signature
exception
how to remove exception
set the position of digital signature
returned null;