Java
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java – MessageConsumer / MessageProducer vs QueueSender / QueueReceiver
Is messageconsumer / messageproducer equivalent to queuesender / queuereceiver? As far as I know, messageconsumer / me…… -
Java – polymorphism using Jackson to add subtype information at run time
I'm using Jackson to ungroup polymorphic types from JSON I use @ jsontypeinfo, @ jsonsubtypes and @ jsontypename annot…… -
Java – why can’t Tomcat find smtptransport (session, urlname)?
We have a web application that sends mail For some reason, its installation has decided that it cannot find the constr…… -
Java – multiple enumerations and one enum
When I stumbled upon something I didn't understand why, I was looking at the example implementation of publisher (asyn…… -
java – arrayListName. What does sort (null) do?
I have a project. The professor gave us some code There is a line in the code that puzzles me: arrayListName.sort(null…… -
Java – call thread What is the performance cost of isinterrupted()?
From the Java source code, it looks like native code Is the cost roughly equivalent to volatile reads or does it need …… -
Generic Dao in Java
I'm trying to develop a general Dao in Java I tried the following This is public abstract class AbstractDAO<T> …… -
Java – how to configure multipartresolver with different maxuploadsize for ordinary users and administrators?
I can use a 10k (10000 byte) maxuploadsize to define such a multipartresolver: <bean id="multipartResolver" cla…… -
Java scripting language (JSR 223)
I'm designing a framework. I want to attach it to the scripting language API to make it more general and easier to use…… -
Java – is it necessary to close the I / O stream created from the socket IO stream when the socket is closed?
private val in = new BufferedReader(new InputStreamReader(con.getInputStream())) private val in = new BufferedReader(n…… -
Java – abstract classes used in static blocks
I can add the abstract keyword in the static initialization block, but I cannot add abstract methods abstract void dra…… -
A Java man asked: why should I learn Python?
This may be a language troll or failure to perform basic Google search; Please rest assured that this is not the forme…… -
JUnit – integration testing of spring boot based microservices
I have read a lot of guides about using spring boot and restful services, many of which contain information about runn…… -
Navigablemap. Java Equivalent in C sharp of floorentry, ceilingentry
I use the navigablemap interface many times in Java, which is very convenient Specifically, I like to use its floorent…… -
Java – chart above grid line in achartengine bar chart
In achartengine bar chart, can I draw a bar chart through grid lines? How do you do it? At present, grid lines are dra…… -
What are the default modifiers for fields and methods in Java annotations?
Which is the default modifier for X and M public @interface Anno { int m() default x; int x = 10; } ？ I think…… -
Java – Apache HTTP client prints “[read] I / O error: read timeout”“
I am using Apache HTTP client v4 5 and use it as a rest client In some cases, I recognize an error "[read] I / O error…… -
Java – when the first parameter is a class with a method, you cannot replace the SAM constructor with lambda
I'm confused about the SAM constructor. I have this Java class: public class TestSam<T> { public void obser…… -
Java – distinguish between connection rejected and connection timeout
Using Java net. socket. When connect(), both connection rejection and timeout will result in connectexception java.net…… -
Java – handling illegalthreadstateexception
import java.io.*; import java.io.*; class Sysexecute { public static void main(String args[]) throws IOException,I…… -
Simulation – 6502 and Commodore pet interrupt behavior in independent test
I am building Commodore pet on FPGA I have implemented my own 6502 core in Kansas lava (the code can be found in https…… -
Java – binding generic parameters to class Uncheck when
I have some code. It uses the class name provided externally. It needs to construct an instance that implements an int…… -
Write temporary files in Java
I want to write temporary files in append mode I see that the file has been created, but the data in the StringBuffer …… -
Java – copy of Lombok @ getter and collections
Using @ getter on the list field works normally, but concurrent modificationexceptions are encountered when trying to …… -
java – org. apache. commons. net. ftp. Problem with ftpclient listfiles()
org. apache. commons. net. ftp. The listfiles() method of ftpclient is applicable to 127.0 0.1, but returns null under…… -
Java – convert the list to a list of 10 items
I have a list of POJOs Convert this POJOs list to a list, where each sublist is 10 or smaller in size So, for example,…… -
Java – convert c-shared library callbacks to other languages
I am developing a library that will be written in go and compiled into a C shared library, so it can be written in Pyt…… -
Java – RPM files generated using the Maven RPM plug-in
I tried to create my Maven project on my windows machine RPM file I follow the steps given in the link below to implem…… -
Java – when AspectJ is loaded, weaving cannot work on spring beans
I'm developing a project that uses the Java (not XML) style of spring configuration to connect dependencies It also ha…… -
How to use swingx 1.6 to highlight every other line in JTable
I need to highlight each line in JTable Using an older version of swingx, you can do this: table.setHighlighters(new H…… -
What does Java mean in memory
I'm a novice in Java and I'm still learning I caught the heart and anonymous lessons Now I have a technical problem ab…… -
Java – what is the best way to navigate complex trees of different objects?
For example: class Vehicle { Collection<Axle> axles; } class Axle { Collection<Wheel> wheels; } ……