I want to learn JSON data storage in Java using Eclipse, so I googled a lot. I found JSON.simple and GSON. Are those a good choice? I went to Properties >> Java Build Path >> Add External JARs. I added json-simple-1.1.1.jar and google-gson-2.2.4-release.zip. Is it right? Where is the JavaDoc locat…
Tag: java
For PBKDF2, using HMAC-SHA256 is more secure than using HMAC-SHA-1?
I’m looking for the proper Java algorithm for password encryption, and I found that Java SDK provides PBKDF2WithHmacSHA1, but not PBKDF2WithHmacSHA256. I heard that HMAC-SHA256 will take more time than HMAC-SHA-1 does. Since system resources are limited, I’m going to apply different iteration valu…
Tomcat vs Vert.x
For the past few days I have been reading Vert.x documents. I know that Vert.x is polyglot, single threaded, non-blocking IO, modular architecture, high scalability. Is there any other major differences between tomcat and Vert.x? Also when we should use tomcat and when to use Vert.x? Answer Tomcat is a servle…
Android Archive Library (aar) vs standard jar
I’ve been reading some articles about the new adoption of Gradle as the standard build system for Android apps. Well, coming from standard Java development I usually depend on jar files in order to build my project. However it seems that Android has also aar packages, which are the equivalent to the dll…
Unable to import certificate to cacerts
My requirement is to import a certificate for maven repositories into the global keystore. The certificate file is named maven-cacert.cer . I am using following command from C:Program FilesJavajdk1.6.0_20bin from cmd as maven-cacert.cer file is in C directory after pressing enter it asked to put password and …
Is there any way to create a Pivot Table in Excel using Apache POI?
I am currently working on the automation of Excel, and add such I have made a good use of the Apache POI library. As I have so much data stored in my excel workbook in various columns, that I’m trying to create a pivot table. Is there any way to create Pivot tables using POI ? My requirement is that
_XReply() terminates app with _XIOError()
We’re developing some complexed application which consists of linux binary integrated with java jni calls (from JVM created in linux binary) from our custom made .jar file. All gui work is implemented and done by java part. Each time some gui property has to be changed or gui has to be repainted, it is …
How do I configure log4j to send log events to java.util.logging using JULAppender?
I am familiar with the java.util.logging (JUL) framework, I use it extensively. Recently, I started using a library that does its logging through log4j. When I start my application I now get the following printed on the console: It appears that log4j has a solution for this: JULAppender which will send everyt…
Uniform random distribution in java
i’m generating Random values with range of 5.0 – 9.0, are the numbers generated still uniformly distributed theoretically ?? and how to implement the histogram, i mean what values we need to implement the histogram ?? i’m zero on math .., pls help me Answer You are on the righ path- scaling …
Error parsing data org.json.JSONException: End of input at character 0 of – Android
I’m developing a test Android application that must display some data from a mysql db. Here my logs: Here the class JSONParser.java Here the class I use to display the selected data: Here the php file: In addition, here the main Activity: I read various thread around the internet about this error, but i…