java

问题 this will be a very baic question since im new to Spring-Redis Im currently in the process of learning about Redis database and I'm working on a feature on priority, im compelled to Use Redis for this feature. Below in the challenge/Query im having. Right now we have a DataModel as below: @RedisHash("Org_Work") public class OrgWork { private @Id @Indexed UUID id; private @Indexed String CorpDetails; private @Indexed String ContractType; private @Indexed String ContractAssigned; private

问题 This question already has an answer here : Invalid state, the ResultSet object is closed (1 answer) Closed 5 years ago . Given the code below: //connection stuff ResultSet rs = statement.executeQuery(query1); statement.executeQuery(query2); while(rs.next){ //code } Is the result set rs still valid even though a second statement has been executed? I know that when you close a statement the result set isn't valid any longer, but here the code is simply executing another query and not storing it

问题 This is probably a simple question but I'm currently working with vlcj to make a video player for a project. I have a basic player working but only when I have the VM arguement -Djna.library.path="C:\Program Files\VideoLAN\VLC" defined in the debug configurations window. My question is if I need to create a version of this project to run outside of Eclipse do I need to define this argument in my code or will my program run in this way without problems indefinitely? Thanks to anyone who

问题 After spending the day of learning about the java Concurrency API, I still dont quite get how could I create the following functionality with the help of CompletableFuture and ExecutorService classes: When I get a request on my REST endpoint I need to: Start an asynchronous task (includes DB query, filtering, etc.), which will give me a list of String URLs at the end In the meanwhile, responde back to the REST caller with HTTP OK, that the request was received, I'm working on it When the

问题 I have searched a few solutions but cannot really find an answer. Within my app i save reports to pdf using IText, but now i would like to merge all the files within the folder as I complete the report. The issue is each folder contains different number of files so I cannot just hardcode them in. Any advice will be appreciated. 回答1: Here is a working example. I have used ITEXT Dependencies : <dependency> <groupId>com.itextpdf</groupId> <artifactId>itextpdf</artifactId> <version>5.5.10<

问题 I am creating this program in Java that import X number of Audio files and mix them in 1 audio file. Example: Import: "Audio1.wav", "Audio2.wav". Mix them. Export: "Result.wav" Until now i have the import and export methods, my problem is mixing the files into 1 file. Edit: Some pice of code. private static File openDialog(){ JFileChooser open = new JFileChooser(); int returnVal = open.showOpenDialog(open); if (returnVal == JFileChooser.APPROVE_OPTION){ return open.getSelectedFile(); } return

问题 I am creating this program in Java that import X number of Audio files and mix them in 1 audio file. Example: Import: "Audio1.wav", "Audio2.wav". Mix them. Export: "Result.wav" Until now i have the import and export methods, my problem is mixing the files into 1 file. Edit: Some pice of code. private static File openDialog(){ JFileChooser open = new JFileChooser(); int returnVal = open.showOpenDialog(open); if (returnVal == JFileChooser.APPROVE_OPTION){ return open.getSelectedFile(); } return

问题 I have a backup utility, workig on restore section. This is my table: CREATE TABLE "SBOOKS"."DEV_CORPUS" ( "CORPUSID" NUMBER(9,0) NOT NULL ENABLE, "CORPUS_NAME" VARCHAR2(768 BYTE) NOT NULL ENABLE, "CORPUSLASTSYNC" DATE, PRIMARY KEY ("CORPUSID") In restore class I would like to look for a primary key in table, if it exists then update the row, if not then insert a row. now the problem is I need to pass the parameters from the class (they do not exist in any table), how can I do this? what is

问题 I was under the impression that the algorithm should conserve energy if the system being modelled does. I'm modelling the solar system, which should conserve energy. The program conserves angular momentum and does produce stable orbits, but the total energy (kinetic + gravitational potential) oscillates around some baseline. The oscillations are significant. Are there common reasons why this might happen? Model assumes planets are point masses, circular orbits (I've also tried elliptical

问题 I set the test name in my test class using annotation: @Test(testName = "sth") and I need to get it from Listener class which implements ITestResult. Method getTestName() returns null but according to http://testng.org/javadocs/org/testng/ITestResult.html#getTestName-- should returns the string. Am I doing sth wrong? Is it possible to get the string set in @Test(testName = "") from Listener class? 回答1: getTestName() may return null in some case. Check no regression test from TestNG if you