Since a few days, navigating the file system with Netbeans is VERY slow (more than two minutes to access a file, and if you have to navigate a file system, it is true every time. I have exactly the same problem after clearing the cache, and with Netbeans 8.2 and Netbeans 12 (Netbeans 8 with Java 8, and Netbea…
Tag: java
In Java 8 compiler, what is nameexpr field in JCVariableDecl for
In java compiler JCTree.java the JCVariableDecl is defined as the following: However, I am not sure how nameexpr can be useful here. In what situation nameexpr field is not null? I have read the BNF of Java 8 and JavacParser.java it seems that we need to construct a case to make pn.hasTag(Tag.IDENT) &&…
Java cannot find symbol for imported scala class
I received a Scala jar and need to write a java program to use a method. The imported Scala method definitely works because it has been in production for years. here is the program: Decompiled Scala code: Here are observations: Error message: cannot find symbol constructor VerifyApp() location: class com.comp…
Why do I have to set AuthenticationManager twice
In my application I’ve implemented X.509 authentication I created the following class named X509AuthenticationFilter that extends AbstractPreAuthenticatedProcessingFilter provided by spring security by default. I added my own AuthenticationManager to the class And also included the following setter The …
How to check in which line of text the word is
I’m doing an exercise where I need to count how many times a word appears on a text and I also need to print in which line the words are present. Text example: Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim ven…
Compare two dates in years with comma and leap year
There are many entries on the internet how the difference between two dates can be compared. However, I still haven’t found the right solution for me. In short: I’m looking for the equivalent of dayjs (javascript library – dayJs) function diff with the parameter “years” and a com…
How can I change di job CRON expression in order to run my Spring Batch job twice a week?
in a Spring Batch application on which I am working on I scheduled a job in this way: This works fine and my job is runned every Sunday (day 7) at 01:30 of the night. Ok it is fine but now my client ask me to run it twice in a week (same time but in two different days). Is
Storing a temporary value of a constantly changing variable
I would like to know, is it possible to store a temporary value of a variable before it switches to another one? Following is the code snippet: Answer You need to have a sum variable before the for cycles, and in the first for, after the second, have the sum add the counter.
Java filtering the object list to string array with stream
I have a class like this and static function like this The problem is inside of filterLength function I can’t return stream as a String array(I want to return content in the Host class) because List holds Host object how can I return as a string in 1 line code? Answer Transform each object in stream You…
Firebase data not displaying in Recycler view. How do I display user specific data from firebase in recyclerview?
I have attached the firebase data image at the bottom for reference. I have a list of users. In that few users have a node called Cart. I need to display the data in the cart for that specific user. Below is my Activity code Here is my adapter class Here is my Model class I have a list of