Recent questions tagged java

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java - Failed to build app with Maven, I can run code locally, but fail to deploy on heroku

This is my code in github: https://github.com/q463746583/CS4500-Assignment2 I can run it successfully in the local, ... Java app. ! Push failed 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 copy table from one database to another?

I need to take a table from one database and upload it to a different database. So, I create two separate ... csv etc.) and the insert 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 do I add execution environment 1.8 to Eclipse Luna?

I have jre8 installed and set as the default for the jre but under compiler compliance I can't find 1.8 ... or JDK1.8 installation directories. 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 -Djava.endorsed.dirs not supported, that emerged after installing WTP in Eclipse?

I used tomcat for projects before, but this problem came after installing the WTP, and occurs when I try ... the concept of upgradeable modules. 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 - Saving to properties file escapes :

Does anyone know why the colons are getting escaped when I store the properties file? I'm doing this: Properties ... /home Anyone know a fix? 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 JavaConfig and CustomScopeConfigurer issue

I'm seeing some odd behavior, I was hoping someone here can shine some light on the issue. Let ... CustomScopeConfigurer object in particular? 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 auto-register entities with JPA/Hibernate: Unknown entity

I'm stumped with a Hibernate/JPA configuration issue that's preventing my JPA-annotated entities from being ... ).createEntityManager(); } 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 stop the block method DatagramSocket.receive() in a thread

i create a DatagramSocket in the main thread,and then create a inner class thread to listen the port. when i close ... . how can i do 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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java - 'cmd' is not recognized as an internal or external command, operable program or batch file

When I build my project in netbeans me it shows: 'cmd' is not recognized as an internal or external command, ... 3-binapache-maven-3.3.3in; 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 - Authenticating By IP Address In Spring 3.1: Smartest Way To Do That?

I've implemented LDAP authentication using Spring Security 3.1. My security.xml file for that is posted ... authentication-manager> </beans> 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 object serialization readObject/defaultReadObject

What's the difference between readObject and defaultReadObject in the ObjectInputStream class? I can't seem to ... on the difference. 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 use Hamcrest to check if each element in an array of doubles is "close" to each element in another array?

I would like to compare two arrays of doubles. Using vanilla JUnit, I can do: double[] a = new double[]{ ... for each element in an array. 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 - Overloading with Short and int

Why this code will print int? public static void main(String[] args) { short s = 5; A(s); } public static ... ){ System.out.println("short"); } 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 find HTTP Media Type (MIME type) from response?

While issuing a GET request using Apache HTTP Client v4, how do I obtain the response media type (formally MIME ... using Apache HTTP Client v4? See Question&Answers more detail:os...

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

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356 views

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java - How to find out which line separator BufferedReader#readLine() used to split the line?

I am reading a file via the BufferedReader String filename = ... br = new BufferedReader( new FileInputStream( ... on another operating system. See Question&Answers more detail:os...

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

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282 views

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java - Netty 4 multiple client

I need to make the client is able to make many connections. I use Netty 4.0. Unfortunately all existing examples do ... ? or could it be better? 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 softKeys() deprecated in Guava 10?

As of Guava 10, MapMaker.softKeys is deprecated, and the corresponding method doesn't exist in CacheBuilder. Why ... existing code that use 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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122 views

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java - Binding parameter as PostgreSQL array

I'm trying to bind a prepared statement parameter which is a "multidimensional" PostgreSQL array. Here's an ... type Types.ARRAY Any ideas? 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 - Do not share same socket between two threads at the same time

I have around 60 sockets and 20 threads and I want to make sure each thread works on different socket ... on a particular socket. 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's Scala's idiomatic way to split a List by separator?

If I have a List of type String, scala> val items = List("Apple","Banana","Orange","Tomato","Grapes","BREAK" ... list (thus 2 "BREAK" markers). 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 - Get rid of the "UNKNOWN" publisher from applet security warning

I'm trying to sign an applet so that the publisher does not appear as "UNKNOWN" : I work for an ... the certificates please share. 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 - ClassCastException: org.slf4j.impl.Log4jLoggerAdapter cannot be cast to ch.qos.logback.classic.Logger

I was following this answer in order to add a appender on runtime. Even though that works for the original poster, I ... and not for me? :-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 - Objects as Map keys without Hashcode and equals

public class Contact { int i; String name; public Contact(int iVal, String nameVal) { i = iVal; name = ... without m2 replacing m1's value. 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 - Regex to test if a string ends with a number

I'd like to test if a string ends with a a digit. I expect the following Java line to print true. Why does it ... a number 4".matches("\d$")); 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 - JAX-WS and Joda-Time?

How do I write a JAX-WS service so the @WebParam of my @WebMethod is a Joda-Time class like DateTime? Will ... "end") DateTime end ); } See Question&Answers more detail:os...

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

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538 views

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java - iText - Rotate page content while creating PDF

I would like to produce a PDF that has pages in landscape. While it is possible to set the size of the ... iText after adding content 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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402 views

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java - Use switch statement to compare a string against an enum

I'm making (my own version of)roulette with Java, and one of the types of bets a player can make is to ... enum 'colors' in a switch statement. 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 create Jpa repository dynamically inside a class?

How do I create and instantiate a jpa repository inside a class? I'm in a situation where I have to create ... , by specifying the domain 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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