Recent Posts
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Java – can I ask the JDBC template to extend a list parameter for use in an in () clause?
Can I do this select * from mytable m where m.group_id in (?) ... and pass in a list or array parameter to extend to m…… -
Exception in thread “main” Java lang.NoClassDefFoundError：org / apache / commons / codec / DecoderException
I try to query Solr through solrj This is my code public class ReadFromSolr { public static void main(String[] args) …… -
Java – how do i disable pop-up form based login for restful endpoints?
I use spring security configuration based on forms and authentication, according to auto config = 'true' I hope that t…… -
Why do integers not represent Nan in Java?
When I write something like double a = 0.0; double b = 0.0; double c = a/b; The result is double Nan, but when I try t…… -
Java – spring crudrepository exception
I have this spring data crudrepository to handle CRUD operations on DB @Repository public interface IUserRepository ex…… -
Java – JPA best practice: statically finding entities
Imagine that an event entity references a state entity: @Entity @Table(name = "event") public class Event() { @Id …… -
Object variables and class variables in Java
I'm learning Java. I don't understand the difference between object variables and class variables All I know is that i…… -
Java – use ejbcontext getcontextdata – is this safe?
I plan to use ejbcontext to pass some persistent lifecycle callbacks that cannot directly inject or pass parameters (s…… -
Java 8 parallel streams use the same threads for sequences
Say we have such things: LongStream.range(0,10).parallel() .filter(l -> { System.out.format("filter: %s [%s]\n",l…… -
Java RMI – client timeout
I am using Java RMI to build a distributed system, which must support server loss If my client uses RMI to connect to …… -
Java – spring MVC test result 415 error
I'm trying to write integration tests for rest APIs implemented using spring MVC This is my rest implementation: impor…… -
Java – the difference between JSF beans and EJB beans
I need some clarification I know how to use JSF and its corresponding session beans, but I'm confused about EJB What i…… -
Java – override interface variables?
When I read from various java books and tutorials, the variables declared in the interface are constants and cannot be…… -
Java – maven-tomcat7-plugin generates a corrupted executable jar
I encountered a problem when using the maven tomcat7 plug-in to generate a jar archive with an embedded tomcat7 instan…… -
”””Is it a good way to convert an integer to a string in Java?
See the English answer > How do I convert from int to string? nineteen int i = 0; String i0 = i + ""; So, is this a…… -
Java – iteratively find a map entry at the index?
I have a LinkedHashMap I want to get foo in index n Is there a better way to do this than iteration? int target = N; i…… -
Java – how to build an executable jar from a multi module Maven project?
I'm a beginner and don't know much I can build simple executable jars, but how to build a multi module Maven project i…… -
How to load Java property files and use them in spark?
I want to store spark parameters (such as input file and output file) in the Java properties file and pass the file to…… -
Java – IntelliJ switch statement uses string error: use – source 7
I tried to use IntelliJ (on Mac OS X) to compile some code I wrote using eclipse I tried to run the following code: sw…… -
Can an object be stored on the stack instead of the heap in Java?
Can an object be stored on the stack instead of on the heap? I recently experienced this blog http://www.programmerint…… -
Do java blocked threads consume more CPU resources?
I want to ask if Java will use more CPU resources when a thread is blocked, that is, waiting to lock the monitor curre…… -
Java – variable or immutable classes?
I have read some design books. Immutable classes improve scalability and write immutable classes as much as possible B…… -
Java – the strict order in which messages are processed concurrently
In my Java EE web application, I need to strictly process incoming mail in the order of arrival I assume that my webap…… -
Java – the difference between head and tail recursion
See English answers > what is tail recurrence? 20 The definitions I was told are as follows: Tail recursion: if the…… -
Clojure macro for calling Java setter based on map?
I wrote a clojure wrapper for the Braintree Java library to provide a more concise and idiomatic interface I want to p…… -
Java – fatal error: content not allowed in 1:1: Prolog
I'm using Java and I'm trying to get XML documents from some HTTP links The code I use is: URL url = new URL(link); H…… -
Java – need space between currency symbol and amount
I am printing currency in INR format as follows: NumberFormat fmt = NumberFormat.getCurrencyInstance(); fmt.setCurrenc…… -
Java – RGB to CMYK and return algorithm
I try to implement a solution to calculate the conversion between RGB and CMYK, and vice versa This is me so far publi…… -
Java – how to sort Horizontally Partitioned Data
I have a telco billing software system There are daily user telephone records Logs are divided by date (month) level E…… -
Java – can I schedule messages using a custom algorithm instead of using rabbit MQ for looping?
I am using the looping function of rabbitmq to send messages among multiple consumers, but I can only receive one mess…… -
How to create a simple but well structured score table (score) in Java?
I'm using very basic sound synthesis to create audio and effects in my game Basically, I have some ways to make a freq……