Java
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Java – how to write InputStream to a file using NiO?
I write InputStream to a file in the following ways: private void writeToFile(InputStream stream) throws IOException {…… -
Java – implementing thread pools in services
I'm trying to implement a service that will perform some work on several parallel threads when requested My implementa…… -
Java – two different preparation statements in a single batch
I want to send two different prepared statements in a batch I'm currently doing two things. You can see its role in th…… -
Java – sends a post request using a user name and password and saves a session cookie
After sending a post request with a user name and password, how do I save cookies using jsup? Or do I have to provide …… -
Jpa-2.0 – the @ manytoone relationship cannot be empty
I have a one-on-one relationship and I want to be free: @ManyToOne(optional = true) @JoinColumn(name = "customer_id",n…… -
Java – ant waiting for file creation
Can ant be configured to pause the build process until the file is created (with a relative timeout)? Solution <wai…… -
Java – how to create a hazelcast instance embedded in process memory without networking?
In my unit test, I want to create an embedded (in-process / in memory) hazelcast instance that does not attempt to sta…… -
Integer in Java ParseInt, when ” is the first exception
Integer parseInt( “ – 1000”); Returns - 1000 as output Integer. parseInt(“500”); Throw exception How can we recognize …… -
Multithreading – runspace problem with PowerShell: downloadfileasync
I need to download files using webclient in power shell 2.0. I want to display the download progress, so I do this: $a…… -
Java – what is a hibernate dirty session?
I wonder if anyone can tell me what a hibernate dirty session is? I seem to have a problem with standard queries when …… -
Using Java objects as clojure mappings
I have a Java class that I want to use in clojure But I want to use it as a clojure map What steps are required to do …… -
Java – how to print exceptions using logger?
I have a situation where I want to use the logger to print all exceptions caught in the catch block try { File…… -
How does the Java – immutable object help reduce the overhead caused by garbage collection?
I'm a novice. I've seen garbage collection in the previous two answers here Now, even if programmers have to create ne…… -
Java – spring data JPA If no result returns the default value, find max
I implemented in my spring repository interface: @Query("SELECT max(ch.id) FROM MyEntity ch") Long getMaxId(); If DB i…… -
Java – convert a C long type to JNI jlong
I use JNI to transfer data between C and Java I need to pass a "long" type and use something like this: long myLongVal…… -
Java – SSL connection reset
I tried to connect to an HTTPS endpoint via Java Each method I tried (more details below) eventually generates this st…… -
Java – Jackson and jettison’s use in Jersey
The Jersey framework uses Jackson and jettison libraries for JSON unmarshalling / marshalling For the same JSON genera…… -
Java – how to set JSON instead of XML in Jersey?
Use Jersey java. Net if no title or is accepted in the URI How to set JSON to default serialization instead of XML whe…… -
Java – how to use mockito to display all simulated calls
One of my units failed the test. I'm not sure why I want to be able to see all simulated calls that occur in the syste…… -
How to read files from a remote system using Java?
I have a file copied on one computer and I need to access the file from another computer to update: I'm using Ubuntu L…… -
Java – how to run formbackingobject and referencedata objects in spring web MVC cycle?
I am new to the spring framework and try to understand the functions of formbackingobjects and compare them with the r…… -
Syntax – clojure: [] What do you do in the function parameter list?
I'm trying to solve clojure's joy and want to know_ The function of syntax in function parameter vector Example: (def …… -
Java – Hibernate: how to use concat and group_ CONCAT
How to use concat() and group in HQL queries_ CONCAT()？ Solution About concat: its working principle is the same as t…… -
Java – why is anyvalue% 1 “stupid math” double anyvalue in sonar?
Sony math should not be performed Explanation In my case, anyvalue is a double This is as intended for me The followin…… -
Java – what is the best way to find all addresses at a specific distance from the selected point?
I'm developing an application that should display addresses in specific locations I know how to find the distance betw…… -
Removes a specific character from a string in Java
For example, when we specify the character to be deleted as aeiou, we give a string of "vowel war": Hawaii vs. groney,…… -
Java – application engine data storage: how to implement posts and tags without connection?
I am building an application in Google App Engine (Java) where users can post. I am considering adding tags to these p…… -
Java – the job gives an unexpected answer
Today, I encountered the following problems, and I can't seem to find a solution: int i,j,k; i = j = k = 3; i = k++;…… -
Java – how to learn jsp / MVC, previously in ASP Net MVC?
I'm just beginning to enter the Java world In the past three years, I have been in c# programming and have been doing …… -
Java – slf4j log level as a parameter
There is already an answer to this question: > setting log level of message at runtime in slf4j11 Logger.log(Level.…… -
Java – how do I know the number of worksheets in a workbook?
I use the HSSF API to read data from XLS files But there is no way to get the exact uncertainty Worksheet in workbook …… -
Java – the strange “reduce” method group is in the jdk8 batch collection operation library
Why does the new jdk8 stream class only contain the following reduce methods: T reduce(BinaryOperator<T> reducer……