Recent questions tagged Java

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java - How to configure Eclipse to compile using Oracle javac 1.7.0_09?

I am trying to compile following piece of code: public class DuplicateMainExample { public static void main(String[ ... in Eclipse using javac? 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 - Getting "Query does not returns results" SQL exception

I was trying to make a register program in Java in Eclipse. But i got an error : java.sql.SQLException: Query does ... me please ? 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 to start FireFoxDriver using Selenium 3.4.0 using Maven?

I am trying to use Selenium's latest version 3.4.0 in a maven project. I imported all Selenium's jars ... to any dependencies. Please help. 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 - Wildcards with diamond operator

If I am trying to do something like this : List<?> unknownList = new ArrayList<>(); then the code compiles ... wildcards? If YES then WHERE??? 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 - javac classpath option with multiple jar files in current directory causing error

Environment: Windows 7, Java 6. Trying to compile a .java file with -cp option. The file uses a single jar ... anywhere in my full file paths. 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 - Getting URL after a redirect using HttpClient.Execute(HttpGet)

I have searched for a while and I am not finding a clear answer. I am trying to log into a webstie. ... help is greatly appreciated thank you. 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 - SessionFactory.openSession(Connection) in Hibernate 4

I am pumping existing JDBC connection using SessionFactory.openSession(Connection). Now in 4.0 this method is not available ... I use for 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 - Why LocalDate, LocalTime and Stream objects use a factory method of() instead of a constructor?

Why LocalDate, LocalTime, Stream, etc. objects use a factory method of() instead of a constructor? I found an ... is used to create a Stream? 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 - Change the alpha value of a BufferedImage?

How do I change the global alpha value of a BufferedImage in Java? (I.E. make every pixel in the image that ... 100 have a alpha value of 80) 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 - AuthenticationSuccessHandler example for Spring Security 3

I am a newbie to Spring Security 3 . I am using roles for users to login. I want to redirect a user to ... would help. Thanks in advance, Vivek 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 fix ClassNotFoundException: org.apache.commons.logging.LogFactory?

When i run the app it getting exception Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/ ... where is my mistake. 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 Sun JDK generate core/heap dump files when JVM crashes?

Is there anyway to generate core/heap dump file when JVM crashes? Since these files are usually very helpful to find out bugs in code. 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 JMS(ActiveMQ) delayed delivery of messages

We're trying to set a delay on some JMS messages, so that a message will only be added to the queue/ ... to achieve delayed messaging? 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 - Example WorldWind application encounters AbstractMethodError when started

I've been tasked with creating an application using the WorldWind API, and to familiarize myself with the API, I ... jogl, or something else? 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 - Log4j2 custom layout

I am using Log4j2 with a PatternLayout. Is it possible to write my own Layout that extends AbstractStringLayout, so ... /2.x/manual/layouts.html 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 - Local Type Inference vs Instance

I've tried to scan JEP-286 about local type inference. I see that this works only for local variables - ... , a very confused cast probably. 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 - Why is custom system classloader not working?

I'm trying to override the system's class loader using the flag -Djava.system.class.loader=MyLoader. However, ... being loaded from jce.jar? 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 to Garbage Collect

I have a piece of code that load a very big image in memory. So it seemed like a reasonable thing to call ... memory as posible prior to 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 - Opensaml error receiving correct unmarshaller

I am running this code at opensaml2.6 Element metadataRoot = document.getDocumentElement(); // Unmarshall ... works at opensaml? 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 - Adding arrays with same values to HashSet results in duplicate items

I'm trying to create a set of arrays of ints, the thing is that if I try to do: HashSet<int[]> s ... just make the array final. Thanks everyone! 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 - Optionally getting field

I have a class structure like this: public class Foo { private FooB foob; public Optional<FooB> getFoob() { return ... in Java 8 with 1 line? 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 locate and print the index of a max value in an array?

For my project, I need to make a program that takes 10 numbers as input and displays the mode of these numbers. ... .out.println(+index); } } 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 - "Sessions" with Google Cloud Endpoints

This question is only to confirm that I'm clear about this concept. As far as I understand, Google Cloud ... good in terms of performance? 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 determine the length of a graphic string?

I'm creating a graphical timeline out of an excel document and I need to have small tags of the name of the ... help me get the exact offset? 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 - iText version 4.2.1 redirected in maven central repository

We're using iText in one of our projects to generate PDF reports, precisely the version 4.2.1 because it is the ... in version 4.2.1 via maven? 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 - MainActivity.this is not an enclosing class AsyncTask

I'm trying to create an AsyncTask for the 1st time, but I don't have much luck. My AsyncTask needs to ... .LayoutParams.WRAP_CONTENT)); } } } 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 - Locking on a mutable object - Why is it considered a bad practice?

See this answer. It says: Six really bad examples; ... locking on a mutable field. e.g. synchronized(object) ... but was not an immutable 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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265 views

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java - Programmatically list open projects in an eclipse workspace from outside of eclipse

I want to write a Gradle plugin which can inspect an eclipse workspace directory and iterate over the open ... within an eclipse plugin. See Question&Answers more detail:os...

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

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