I would like to achieve the same what this openssl command performs, but programmatically in Java: openssl pkcs7 -in toBeExported.p7c -inform DER -out certificate.pem -print_certs which means that …
cannot access files in appbase’s subfolder in tomcat
I have a very simple Tomcat web app. This app is deployed to ${catalina.home}/webapps/myapp. Under myapp there are two folders: 1. WEB-INF – contains a single web.xml file with bare minimal content. 2. document – contains a folder called data. My goal is to access any files under document folder. …
How to install the JDK on Ubuntu Linux
Note: This is an old question and the answers reflect the world as it was then. Modern Ubuntu distributions have OpenJDK available which can be installed with I am trying to install the Java Development Kit (JDK) on Ubuntu Linux distribution, but I am unable to install it. What are the steps to install it on …
How static nested class has this pointer
Today I was reading about static nested class and I am little confused because of below code. What I understood about static nested class is, it behaves like a static member of outer class. It can refer only static variables and can call static methods. From the above code, the error at x=0 is fine. But what …
Converting Decimal to Binary Java
I am trying to convert decimal to binary numbers from the user’s input using Java. I’m getting errors. How do I convert Decimal to Binary in Java? Answer Your binaryForm method is getting caught in an infinite recursion, you need to return if number <= 1:
Java: Using Semaphore with timer
Hello im trying to synchronize classes using semaphore.acquire() and semaphore.release(). I’m calling semaphore.release() from a class named ReadSerialPort and semaphore.acquire() from WriteSerialPort to connect a phone-center to PC. My problem is that phone-center is not always responding. I would like…
Does HashMap.clear() resize inner hash table to the original size?
What happens to the HashMap after this code execution? HashMap m = new HashMap(); for (int i = 0; i < 1024 * 1024; i++) m.put(i, i); m.clear(); After 1M puts the inner hash table will grow …
How do I give Jenkins more heap space when it’s running as a daemon on Ubuntu?
My Jenkins jobs are running out of memory, giving java.lang.OutOfMemoryError messages in the build log. But I used the Ubuntu Package Manager, aptitude, or apt-get to install Jenkins, and I don’t know where to look to change the amount of heap space allocated to Jenkins. Answer There are two types of Ou…
AnchorPane shows a white border when setResizable is false (JavaFX)
My problem is that when I use setResizable(false) one white border is shown on my scene. When I don’t set it false works fine, but I need to set it false. Code: My ImageView is inside of my AnchorPane Answer I had the same issue, I resolved in this way: You have to set the scene before setting the resiz…
FileNotFoundException when loading freemarker template in java
I get a file not found exception while loading a freemarker template even though the template is actually present in the path. Update: This is running as a webservice. It will return an xml to the client based on a search query. The template loads successfully when i call it from another java program(from sta…