Recent questions tagged JAVA

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java - How to programmatically kill a storm topology?

I am using a java class to submit a topology to the storm cluster and I also plan to use java class ... of running topologies in storm cluster? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Custom Spring AOP Around + @Transactional

I have a custom Around implemented to match on a custom Annotation. I want the custom around to execute WITHIN the ... . What am I doing wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - ClassCastException: DispatcherServlet cannot be cast to Servlet

I have created a new Spring MVC project using maven-eclipse and the following error is thrown: (I tried some ... </listener> </web-app> See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Tess4j doesn't use it's tessdata folder

I am using tess4j, the java wrapper of Tesseract. I also have the normal Tesseract installed. I am not exactly ... I have set a classpath). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - onSave() (for any Entity saved with Hibernate/Spring Data Repositories)

If my Entity has calculated fields should be updated before saving to database (db insert or update), How can ... Spring Data Repository save()? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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537 views

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java - Efficient System.arraycopy on multidimensional arrays

I'm aware that a common performance refactoring is to replace simple for's by System.arraycopy. I want to ask about: When ... ][i] = vr[j]; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Meaning of "this" in this code?

public boolean contains(Object o) { for (E x : this) if (x.equals(o)) return true; return false; } Can ... I write it without this and how? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Implement (/inherit/~extend) annotation in Kotlin

In Java I have the possibility to "implement" annotations. Sample Java annotation: @Target(ElementType.TYPE) @Retention( ... .com/issue/KT-25947 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - referencing ant script location from within ant file

I have a utility build script that gets called from a variety of project-specific build scripts on a build ... this from the importing script? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - org.apache.jasper.el.ELContextImpl cannot be cast to org.apache.jasper.runtime.ELContextImpl

I have a web service project implemented in java and it also contains jsp pages. I deploy it on jetty 8.1.5 ... exception and how to fix it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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540 views

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java - Cannot run program "..../abc.exe": error=13, Permission denied

I am trying to execute the following code: try { Runtime rt = Runtime.getRuntime() ; Process p = rt.exec("/ ... on how to get this working? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What is the use/purpose of primitive type classes?

I recently learned that there are Class representations for the primitive types in the JVM. For example, int.class, ... their use, in the JLS. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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319 views

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java - What is the best practice when implementing equals() for entities with generated ids

If I have a table with columns A, B, C, D A: auto-generated id (PK) B & C: combination must be ... really matter which of the two I choose. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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583 views

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java - How to define dynamic setter and getter using reflection?

I've a list of strings, field names, of a class in a loop from resource bundle. I create an object and then ... to do it. Please help. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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316 views

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java - JGit: How to get all commits of a branch? (Without changes to the working directory ...)

how do I get all commits of a branch with JGit, without changing the working directory? Unfortunately ... end Bye, hurik See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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207 views

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java - Using a larger prime as a multiplier when overriding hashCode()

I have been reading about hashcode functions for the past couple of hours and have accumulated a couple of questions ... to do it like that. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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299 views

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java - android searchview setOnActionExpandListener on Honeycomb 3.2

I'm developing an app for Android 3.2 and greater with android-support-v4. I need to implement OnActionExpandListener ... ? Thank you so much. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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277 views

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java - Running JUnit Test in parallel on Suite Level?

I have a bunch of tests that are organized in JUnit test suites. These tests are greatly utilizing selenium to ... not the suites. br Frank See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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380 views

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java - Create war file from Spring:boot project in Eclipse

I am pretty new to Spring Boot and I have completed a application that works well on my localhost. As I have ... to deploy to a external server? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Generate N random numbers in given ranges that sum up to a given sum

first time here at Stackoverflow. I hope someone can help me with my search of an algorithm. I need to generate ... or and idea of an algorithm. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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235 views

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java - Hungarian Algorithm: How to cover 0 elements with minimum lines?

I am trying to implement the Hungarian algorithm in Java. I have an NxN cost matrix. I am following ... help/suggestion would be appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How can I get the autoincremented id when I insert a record in a table via jdbctemplate

private void insertIntoMyTable (Myclass m) { String query = "INSERT INTO MYTABLE (NAME) VALUES (?)"; jdbcTemplate. ... of my method would be int See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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295 views

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java - Log4j Properties in a Custom Place

I'm using Apache Commons Logging and SLF4J with log4j, but I also want to use the log4j.properties in a ... what the logging implementation is? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to select from multiple databases in Android Room(How to attach databases)

As you know we can select from multiple databases using attach command like this: String path = DBHelper. ... command to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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301 views

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java - Find directory for "application data" on linux and macintosh

I have a game engine based on LWJGL, and to run it I need to place the required native libraries onto the ... user.home" finds the correct one. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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692 views

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java - Using lomboks @Data and @Builder on entity

I am using the following: @Entity @Data @Builder @NoArgsConstructor(force = true) public class User { private String id ... at the same time? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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328 views

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java - Spring Restfull Jax-RS annotation support

I have following class and web.xml files. Does spring framework supports jax-rs annotation such as @PATH, and @PUT ... -on-startup> </servlet> See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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249 views

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java - Custom Error Page in Tomcat 7 for Error Code 500

Guys I am struggling with the problem of opening my custom error page in Tomcat in Windows Environment. Some of ... know. I need it ASAP. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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