Recent questions tagged JAVA

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java - spring boot rabbitmq MappingJackson2MessageConverter custom object conversion

I'm trying to create a simple spring boot app with spring boot that "produce" messages to a ... com/gustavoorsi/rabbitmq-consumer-receiver 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 - Android: Convert Stream to String without running out of memory

I have an android client that communicates with the server via REST-ful endpoints and JSON. Because of this, I ... data from the server? 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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java - Hibernate pagination mechanism

I am trying to use Hibernate pagination for my query (PostgreSQL ) I set setFirstResult(0), setMaxResults(20) ... paging in Resultset, right? 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 - Httpsession management in springMVC

I am new to spring MVC and started to make a sample application by doing what I learned. I am planning to ... the object if needed and go on 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 - Is it good practice to often use instanceof?

The scenario. I'm writting game-related code. In that game a Player(its also a class) has a list of Item. ... I rethink all of my structure? 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 - Android NDK, keeping live C++ objects

I've got a following problem. I want to write an Android application, which uses my legacy C++ classes. ... Does Java support storing pointers? 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 - Removing Dollar and comma from string

How can we remove dollar sign ($) and all comma(,) from same string? Would it be better to avoid regex? String liveprice = "$123,456.78"; 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 - Create string with emoji unicode flag countries

i need to create a String with a country flag unicode emoji..I did this: StringBuffer sb = new ... String with the unicodes characters? 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 does one configure rJava on OSX to select the right JVM -- .jinit() failing

I installed rJava by calling install.packages("rJava") -- no problems seen However when I call: library(rJava) . ... .7.0_79.jdk/Contents/Home/ 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 - Runtime dependency injection with Spring

My current project is leveraging Spring, and our architect has decided to let Spring manage Services, Repositories ... spring's infrastructure. 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 - Client side caching in GWT

We have a gwt-client, which recieves quite a lot of data from our servers. Logically, i want to cache ... approach that can be implemented? 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 correct way of overriding hashCode () and equals () methods of persistent entity?

I have a simple class Role: @Entity @Table (name = "ROLE") public class Role implements Serializable { @Id ... of solving this problem. 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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java - How can I build WAR with Maven in Eclipse?

I have project that I'm now starting as Maven project, but for some reason it is not working. Here is my pom. ... </plugins> </build> </project> 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 - Unable to resolve reverse routing methods in IntelliJ

I'm following one of the play framework tutorials, but I'm getting compile errors whenever I try to use ... has got the defined methods. 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 - When should I use primitives instead of wrapping objects?

Actually here is a similar topic with little practical value. As far as I understand, primitives perform better and ... ) are needed. Right? 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 does bytecode get verified in the JVM?

How does bytecode get verified in the JVM? 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 - Spring's Stored Procedure - results coming back from procedure always empty

I am using Spring's JdbcTemplate and StoredProcedure classes. I am having trouble getting the stored procedure class to ... didn't work either. 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 - Best enterprise repository tool for Maven 2?

Some of the other questions and answers here on SO extol the virtues of using an enterprise repository tool like ... this one or this 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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java - javax.persistence.NoResultException: getSingleResult() did not retrieve any entities

i have created a namedquery with ejb to check if the username is used. When the singleResult is null, then i ... Exception. Thank you very 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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java - Difference between JDBC Driver type numbers

I noticed that JDBC has different Drivers like: Type 1 Driver Type 2 Driver etc.. to Type 4 Why did they get the ... 2 etc.? Is there any logic? 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 - Reverse opposing colors

I have a user setup where they can choose the colors of the alerts. the Alert is the background color on a ... far. Is there such a function? 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 - Out of heap space during serialization

The following code is causing a OutOfMemmoryError: heap space for some 3 million rows. Memory allocated to JVM ... is the exception occurring? 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 - Can an outer class access the members of inner class?

The inner class is the class defined inside a class, and the inner class can be declared as public, private, ... access members of outer class? 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 - ResultSet: Exception: set type is TYPE_FORWARD_ONLY -- why?

I have very simple code: pstat=con.prepareStatement("select typeid from users where username=? and password=?"); pstat. ... how can I 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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java - spring: return JSON from controller as ModelAndVIew

How can I return JSON from spring controller as a view or ModelAndView? I am not interested in using @ResponseBody ... other way of doing 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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java - Spring managed transactions without @Transactional annotation

I'm using Spring annotations to manage my transactions like so: @Transactional(readOnly = true) public class ... scenarios that could happen? 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 make A future of future into one future object?

Env: Akka 2.1, scala version 2.10.M6, JDK 1.7,u5 Now is my problem: I have: future1 = Futures.future(new ... for bad format and organize... :~P 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 - Scale a BufferedImage the fastest and easiest way

The task: I have some images, I scale them down, and join them to one image. But I have a little problem ... returns null. Do you know why? See Question&Answers more detail:os...

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

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