Java
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jsf – java. lang.ClassNotFoundException：javax. faces. webapp. FacesServlet
I received this error when executing JSF and primefaces I've included these cans, > jsf-api-2.0. 3.jar, > jsf-im…… -
Using null objects to access static fields in Java
The following simple code snippet works properly and is using an empty object to access static fields final class Test…… -
Java – how to keep empty XML tags after XSLT – prevent them from collapsing into
Say I have a very simple XML, an empty tag 'B': <Root> <A>foo</A> <B></B> <C>…… -
Java – how to use flush() in printwriter
I have some code like this: PrintWriter pw = new PrintWriter(new BufferedReader(....)); for(int i=0; i<10; i++) { …… -
Why is java enumeration constant initialization incomplete?
I stumbled upon a very strange mistake. I can't explain why Imagine the following enumeration: import java.awt.Color; …… -
Java – how to generate selection tags using JSTL or standard actions in JSP
I want to create a selection tag in the JSP, where the option is enumeration (for example, all U.S. countries) Are the…… -
Java – use the pop-up startup and security of the custom angularjs login page
I'm implementing a custom angularjs login page for spring security, and I have a problem verifying it I'm following th…… -
Java – JAXB generated XML – root element prefix problem
I'm trying to generate XML using JAXB I created XSD and generated Java classes For example: I want a root tag <repo…… -
Java – how to run a single JUnit test method in eclipse?
There is already an answer to this question: > running a single JUnit test in eclipse 12 For example, how to run a …… -
Calculate Sha 3 hash in Java
I have been using the Sha-3 hash from the cryptojs (i.e. cryptojs. Algo. Sha3. Create()) library to the front end (see…… -
Java – recursively find the nth element in the linked list
I'm practicing basic data structures. I have some difficulties in recursion I understand how to do this iteratively, b…… -
Java – reverse color
I have a user setting where they can choose the color of the alarm The alarm is the background color on the text or bu…… -
Java – spring auto assembly of parameterized collections
Hello everyone, thank you for your help I have a problem that spring cannot automatically assemble parameterized membe…… -
In Java util. Date or Java sql. Select between date
I should use Java util. Date or Java sql. Date？ I have a visual fox database, and I have retrieved entities using the…… -
Java – how do I prevent the spring boot daemon / server application from shutting down immediately?
My spring boot application is not a web server, but it is a server using a custom protocol (using camel in this case) …… -
Java – working sun misc. Base64encoder / decoder get bytes []
I tried to use sun misc. Base64encoder / decoder, but this Code: (new sun.misc BASE64Encoder()).encode(new sun…… -
Clojure – why do I hang when a block is inserted into a channel? (core.async)
Consider the following code snippet: (let [chs (repeatedly 10 chan)] (doseq [c chs] (>!! c "hello")) (doseq…… -
Java – pdfbox: the problem of converting PDF pages into images
My mission is simple: convert every page of PDF file into an image I try to use the open source version of icepdf to g…… -
Java – spring MVC @ requestmapping does not work
I have a strange situation where my controller is not invoked unless I map the scheduler servlet to the web / *. In XM…… -
Java – change the state of the toggle button from another button
I am using swing with eclipse and window builder pro to create a Java GUI I'm using jbuttons and jtogglebuttons I want…… -
Java – error deploying to Tomcat
I use apache-tomcat-7.0 thirty-seven Git： https://github.com/IRus/jMusic When deploying an application: [2013-03-15 1…… -
Java – how does actionlistener work?
I have an idea of how to use action listeners and implement them, but I wonder if anyone can tell me how they listen t…… -
Java – changing bit values with byte
I have some data in the field type byte (I save eight inputs in the byte, and each bit is an input) Solution Set the s…… -
Java – general purpose card lists API calls in the file system of Hadoop
tl; Dr: in order to be able to use wildcards (globs) in the listed paths, just use globstatus (...) Instead of liststa…… -
Macros in Java?
I know there are no macros in Java, but there is a solution to do this: #ifdef _FOO_FLAG_ import com.x.y.z.Foo; #else …… -
Java – used in Apache POI instead of the deprecated cellrangeaddress valueOf
I wanted to add conditional formatting in this region, but one of the methods I saw in the tutorial has been deprecate…… -
Java – code color styles in eclipse
A good simple question: is there anything similar to http://studiostyl.es/ Eclipse? Update: since I use this link to l…… -
Java – GWT: gotcha’s
My team is starting its first GWT project We are quite powerful for swing applications, and almost all our work involv…… -
Using Java Exe executes silent mode
I wonder if there is a way to execute "Java. Exe" as a background process (in silent mode) For example: Java - CP. MyC…… -
Java – is it a bad style to use NullPointerException to test null?
I have some code along the following pattern: return a().b().c().d().e(); Now, since each of these methods can return …… -
Java – “return” stop executing the method?
I have written a method as follows: if (something) { return 1; } the rest of the code In my opinion, the method ret…… -
Rotate the image 90 degrees in Java
There is already an answer to this question: > java: rotating Images2 private void rotateClockwise() { ……