Java
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Java – redirect timeout after httpsession
I've been reading many posts on this topic, but I can't get a solution for my example I am using Java EE 6 and JSF 2.0…… -
Java instanceof and class name
I just asked this curiously. Maybe it's meaningless When we use instanceof in Java, for example: if (a instanceof Pare…… -
Java – how do I access static members in a velocity template?
I don't know if there is a way to do this in velocity: I have a user POJO, an attribute called status. It looks like a…… -
What is the main difference between the optional Scala option of Java 8 and Haskell’s may?
I've read several articles about the upcoming optional types in Java 8, and I want to know why people keep suggesting …… -
Java – is entitymanager really thread safe?
I'm talking about the basic usage here: @Stateless public class BookServiceBean implements BookService { @Persistenc…… -
Java – under what conditions do we need to use composite keys in the database
I've seen that we can use compound keys, where the primary key consists of a combined primary key of two tables Like p…… -
Java – unable to resolve HttpServletRequest
I have imported the following I want to get the preferred language browser HttpServletRequest request = ServletActionC…… -
How do I convert year and week to Java date objects?
How do I convert year and week to Java date objects? I'm using jodatime, but it's also good to use the standard Java c…… -
Java – singleton using atomicreference
Is the deferred initialization singleton correctly implemented using atomicreference? If not – what are the possible p…… -
How to use Java stream to collect multiple lists into one list?
There is already an answer to this question: > java8 lambda: concat LIST1 List<MyListService> services; serv…… -
Java – what’s the big difference between using include or loop through lists?
Performance wise, there is really a big difference between use: > ArrayList. contains(o)vs foreach | iterator > …… -
Tuning GC for Java audio applications
I noticed that when playing audio in Java, the marksweepcompact phase in GC is too long and leads to short silence, wh…… -
Java – @ formdataparam not found in Jersey 2.17
I'm new to web services, so I've started the basic examples This one involves file upload I am using the latest (2.17)…… -
Java – passing methods as parameters – is this possible?
I tried to migrate to Java 8 and have some methods in my Dao class to do the following @Override @SuppressWarnings("un…… -
Java – mention and reorder the same thing?
Read from effective Java. Without synchronization, the following sequence a can be converted to sequence B by the virt…… -
java – android. permission. WRITE_ SECURE_ Settings error
Hello, my problem is that when I try to change the weather or no GPS settings are enabled, I get the following error 1…… -
Java – garbage collection and manual memory management
This is a very basic question I'll use C and Java to make it, but it's really language independent struct Obj { bo…… -
Java – spring asynchronous method called from another asynchronous method
I'm using spring 4 and I noticed a strange behavior... If I call asynchronous methods multiple times from a regular in…… -
Java – use BigInteger multiply operator
I wonder if there is a way to multiply BigInteger variables because the * operator cannot be applied to BigInteger So …… -
Java – is it a best practice to create an unused reference to the value returned by the called method?
I have a friend whose teacher thinks this is a good habit: public void enterAnythingToContinue(){ String junk = in…… -
Copy data files when building in Java / eclipse
With my java source code, I have some data files that I want to copy to the build directory when the source code is bu…… -
Java – environment variable classpath < > classpath of clojure Why?
Here, I check the environment variable classpath Here, I examine what Java thinks it is daniel @ daniel-laptop：〜/ ps…… -
Java – how to correctly escape triple nested quotation marks in JSP Tags
We have just upgraded Tomcat. The newer Tomcat does not like to nest quotation marks in tags, so we must alternate bet…… -
Grand central dispatch – use ‘sync’ to schedule queues and use with What is the difference between work items marked by wait?
I'm learning Apple's GCD and watching the video concurrent programming with GCD in swift 3 At 16:00 in this video, a f…… -
Java okhttp3 only uses http / 1.1 or http / 2
Try to execute some test cases for HTTP requests I want to distinguish between http / 1.1 and HTTP / 2.0 To do this, I…… -
Multithreading – is Delphi 2009 wait chain traversal provided in Windows 7 installation?
According to the "new features of Delphi 2009", there is a new debugger function called "waiting chain traversal" In p…… -
What happens if you use deprecated methods / functions in Java?
Any problems with using deprecated features in Java? If so, why keep this function? Is it a bad habit to use disapprov…… -
Java – numberofviewsinsession and multiple tags
I have a big problem with my application and memory The application (Java with JSF / RichFaces / facelet) is used by a…… -
Does Java – mockito have the same idiom as jmock’s country?
The book "object oriented software" provides several examples in jmock, in which the state is explicit and will not be…… -
Java – why do I need to provide closed class objects instead of closed class objects
class OuterA { class OuterA { class InnerA { } } class SubclassC extends OuterA.InnerA { SubclassC(OuterA…… -
How to use $. Of jQuery in async / await and typescript Post() method
My await statement in the asynchronous function is $. For jQuery Call of post() method, which returns a valid promise,…… -
“Java.net.socketexception: socket closed” when reading S3 file
I'm trying to read the CSV text file from S3 and send each line to the distributed queue for processing When trying to……