Questions tagged [java-package]
Packages are used in Java in-order to prevent naming conflicts, to control access, to make searching/locating and usage of classes, interfaces, enumerations and annotations easier etc. A Package can be defined as a grouping of related types(classes, interfaces, enumerations and annotations ) providing access protection and name space management
java-package
100
questions
477
votes
8
answers
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javax vs java package
What's the rationale behind the javax package? What goes into java and what into javax?
I know a lot of enterprise-y packages are in javax, but so is Swing, the new date and time api (JSR-310) and ...
- 11.5k
14
votes
2
answers
41k
views
TypeError: 'JavaPackage' object is not callable (spark._jvm)
I'm setting up GeoSpark Python and after installing all the pre-requisites, I'm running the very basic code examples to test it.
from pyspark.sql import SparkSession
from geo_pyspark.register import ...
- 1,316
12
votes
1
answer
14k
views
Underscore in package name in Java - is it bad? [duplicate]
Sorry for my English
I think that sometimes it is necessary.
In my opinion search_result_list, location_provider are easier to read than searchresultlist, locationprovider.
What does the ...
- 493
9
votes
1
answer
8k
views
Exclude packages from TestNG
Consider the following TestNG configuration which runs all tests in the com.example.functional.* pacakge:
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
<suite name="Functional1"...
- 134k
7
votes
2
answers
3k
views
How to expand folder branch in Project Window Intellij IDEA?
Sometimes I close folder/package in Project Tool Window and then I should click every folder in it to open them . How to avoid this and open all folders/packages quickly?
- 745
5
votes
1
answer
6k
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Why can't I import sun packages?
I downloaded java 9 from https://jdk9.java.net and installed it on my Windows 10 machine.
Java 9 has jshell, which I can use to evaluate and learn java programming.
Some examples import sun packages, ...
- 473
4
votes
1
answer
165
views
Java - Use of nonpublic class from the current package makes compiling error
I've the following two source files
File World.java
package planets;
public class World {
public static void main(String[] args) {
Mars.land();
}
}
File Moon.java
package planets;
...
- 753
3
votes
2
answers
6k
views
JavaFX vs Java Swing usage in Industry [closed]
Why the developers refused to start new projects using super easy JavaFX package? Why they continue their projects with traditional Java Swing package? What will be the future of JavaFX? Will it be ...
- 330
3
votes
1
answer
5k
views
APT: error: attribute 'package' in tag is not a valid Java package name: 'com.mypackage.name_.app'
I have an app which I'm trying to compile with my original package name, very similar to this: com.mypackage.name_.app'
The app compiled successfully until now, which I migrated to the newest ...
- 36.9k
3
votes
2
answers
3k
views
module-info not compiled unless package classes are compiled with the same command
I've got a folder called myModule. Inside it, there's another folder called myPackage in which my Main.class exists.
Next to myPackage I have my module-info.java which I'd like to compile. First take ...
- 1,856
2
votes
1
answer
2k
views
Can one Java module export a package whose name is a subpackage of a package from another module? [duplicate]
So I know that, in Java 9 modules (Project Jigsaw), split packages are not allowed. That is, the following modules couldn't both export a package with the same name and also be used at the same time ...
- 3,072
2
votes
1
answer
674
views
SharedPreferences managing between different packages
I'm developing one app, with the package com.example1 and I'm doing another module to use as a library with the package com.example2.
On my module (com.example2) I'm using this static functions:
...
- 5,403
2
votes
1
answer
249
views
How to organize code logically into package while preserving encapsulation
This is a conceptual question.
I usually organize code in packages logically.
E.g.: math operation goes in my.package.math or business logic goes into my.package.business and so on.
In these days I ...
- 1,313
2
votes
1
answer
400
views
Pre-Configured Java Web Application Project
Everytime when I create a new java web project, I have to configure and add many folders and property files for primefaces, hibernate, jsf, ldap, tomcat etc.
It wastes all my time. I find a solution ...
- 1,798
2
votes
0
answers
858
views
What's the easiest way to implement the equivalent of Java's package access in Swift?
I have a set of classes in a subfolder (along with a corresponding group in Xcode) that implement the facade pattern: only one class should be used from outside this folder. How do I implement this ...
- 4,948
2
votes
0
answers
122
views
Using partial package path in Java [duplicate]
I have some classes like
a.b.c.v1.Something
a.b.c.v2.Something
a.b.c.v3.Something
There is a place where all of them are visible. Is it possible to arrange that I could refer to them like vX....
- 16.5k
1
vote
3
answers
1k
views
Getting java.lang.ClassNotFoundException when using package
I have a java file ComPac.java with the below code:
package com;
public class ComPac{
public static void main(String[] args) {
System.out.println("Hello World");
}
}
The ...
- 1,020
1
vote
2
answers
4k
views
How can I import class from the same package in Java?
How can I use one class from other class in the same package in the same directory? I have one class Utils:
package pl.jcubic;
public class Utils {
public static String foo() {
return "foo";...
- 65.3k
1
vote
2
answers
611
views
Whether we import source code or byte code of a class when importing that class in java?
I have started learning packages in java.I learned about the import keyword.Now my doubt is whether it is .class file or a .java file that is being imported while we import any class in java.
1
vote
2
answers
7k
views
Java Intellj: org.json.simple does not exist
I know that questions have been asked before, but it does not solve my problem in my school project.
I downloaded the JSON.simple jar file from https://mkyong.com/java/json-simple-example-read-and-...
- 353
1
vote
1
answer
94
views
How to write package-statements for nested packages?
If I have a class in a sub-package like sub-package-name, which is in a parent-package like higher-level-package-name, do I just write
package "sub-package-name";
Or also add the parent-...
- 33
1
vote
2
answers
1k
views
"Error: Package does not exist" ... Where does the JAR file belong? [duplicate]
I'm trying to import a self made package into a Java project. I got it to work once with some test class. So, when I tried to change it to an official, approved class name, the compiling stopped ...
- 973
1
vote
1
answer
487
views
"null" not allowed in package name
I want to create a java package name where one of the elements is the word "null".
Java tells me this is not a valid package:
package org.null.thing;
public class Foo {
public static int ...
- 7,233
1
vote
5
answers
9k
views
Run Java Code without a package in Eclipse IDE
I want to run my code without creating a package in java eclipse IDE.
But when I do so it is showing error :
Must declare a named package because this compilation unit is associated to the named ...
- 23
1
vote
2
answers
2k
views
same package under different projects
I have a silly question, I have two projects A and B. A is dependent on B. Both A and B have the same package named P. Why classes under project A and Project B in package P can use each other without ...
- 331
1
vote
3
answers
472
views
Import package and how to use all classes in a java file
I am creating a package com.XXXX
Inside that I am declaring many classes in a java file (default - not public)
let is be like:
class A{}
class B{}
class C{}
I am importing com.XXXX in another file
I ...
- 1,155
1
vote
2
answers
2k
views
Is it possible to import several packages at once in Java?
I would like for example to do the following:
import packageA.*, packageB.*;
but the above notation does not work. Is it possible to do this somehow in Java, or do I always have to type:
import ...
- 145
1
vote
3
answers
1k
views
It's possible to run multiple java packages each package has a main class
I have many packages that have classes in an eclipse project under src package each package has a main class each class like this
public class A extends TimerTask {
public A()
{
}
@Override
...
- 776
1
vote
2
answers
136
views
Java: packaging class files
I have learned Java package. Unfortunately I don't understand why compiling these .java files causes the compile error.
I have the following 3 java files: Node.java, InvertedFile.java, and Postings....
- 2,664
1
vote
1
answer
4k
views
Sudden "package doesn't exist" in IntelliJ IDEA
Recently I started to receive the following errors about random packages:
mvn build is working of course, the problem is only for building within Idea.
Sometimes I can fix it with reloading maven ...
- 49.9k
1
vote
0
answers
154
views
pyspark 'JavaPackage' object is not callable
I want to remove the first row of a dataset but this error keeps occuring: 'JavaPackage' object is not callable.
I've written another simple program for easier review. Here is my code:
# Create a ...
1
vote
1
answer
821
views
Java Error: Could not find or load main class, Caused by: java.lang.NoClassDefFoundError
Compiled
I've compiled the java code, but I'm not able to run it. I compiled the code with the following:
javac -cp "streamer-client-java.jar:kafka-clients-3.4.0.jar:snappy-java-1.1.10.0.jar:lz4-...
1
vote
0
answers
155
views
How to import a java standard class, from a particular java standard package, from a particular java standard jar?
Short Version
How do i do the equivalent of the hypothetical syntax:
import plugin.jar.netscape.javascript.JSObject; //import netscape.javascript.JSObject from plugin.jar
Long Version
I am trying to ...
- 253k
1
vote
1
answer
215
views
Is it possible to make scalatest to discover within package object?
I have several test facets sharing multiple test classes, so I aggregate them into a trait to be mixin into package objects, expecting that those test classes will be discovered under the package:
(...
- 4,028
1
vote
0
answers
102
views
Access restrictions (modularity) of artifacts in Maven
I know that starting with Java 9 (we're still on 8), it is possible to restrict access to packages for other modules, if you stick to the Java module system. We are doing Java EE and I don't know if ...
- 35k
1
vote
0
answers
140
views
Any way to organize classes within same package
I'm writing a Java library that has a simple interface, but a lot going on behind the scenes. In order to keep the API surface small, I've kept the library as one large package (so that I can make ...
- 409
1
vote
0
answers
485
views
IntelliJ not recognizing classes within the same package - however the program compiles and runs fine
Here's the scene:
For some reason, IntelliJ doesn't accept that Util.java or GraphEdge.java are in the MyHelper package. Therefore, method completion doesn't work. This also causes issues in the ...
- 607
1
vote
0
answers
17k
views
HTTP Status 500 - Unable to compile class for JSP
HTTP Status 500 - Unable to compile class for JSP
Ok, there are lots of articles about this error and i'm still a newbie.
I sow that this error might be caused by some different kind of reasons and ...
- 1,545
0
votes
1
answer
2k
views
What do Java subpackages do, given that they don't provide a special access relationship?
I have seen a number of posts on Stack Overflow and elsewhere assert that Java does not have the concept of subpackages. One thing often pointed out is the lack of any special access relationship ...
- 18.6k
0
votes
1
answer
769
views
How to use the package directive?
I am running the following Dog Java code. It can be compiled. However, in order to run it, I had to modify the code to comment out the line (package chap03). It was a code from a textbook. How do I ...
- 55
0
votes
1
answer
2k
views
Problems with java package names in Gradle build with IntelliJ IDEA
I have a Gradle project and in it I have groovy and java classes at the same package. The build works fine but when I import the project in InteliJ 13 the IDE tells me that only in the java files I ...
- 17k
0
votes
2
answers
241
views
Android Studio : Adding a new java file to an existing package - "Unresolved Reference"
I was looking the HTML to PDF Conversion in android app
I have a problem to do the "it must be in package ".../java/android/print/" from solution number 1.
How can I add the PdfConverter.java in ...
0
votes
1
answer
727
views
Run java from command line with non matching folder structure and package name
Java requires no correlation between package names and source code
file structure. But most IDE's require sub-folder for each part of the
package name.
Is the above statement true?
To try this ...
- 947
0
votes
1
answer
70
views
In Liferay what is the "kernel" package?
I am writing a Liferay hook.
When referencing a Java class in Liferay, the "Organize imports" dialog in Eclipse often offers me either com.liferay.portal.TheClass or com.liferay.portal.kernel....
- 59.7k
0
votes
2
answers
708
views
Listing abstract classes within a Java package [duplicate]
Is there any way to list all abstract classes within a java package? For example, in java.lang package.
- 1,214
0
votes
1
answer
87
views
Error `The declared package "part2.stage2" does not match the expected package ""` with correct package name
So I have a Competitor.java file on path: /home/john/javaStuff/CMTR/src/part2/stage2/Competitor.java. I have VSCode open in the CMTR. So CMTR is my current working directory if that info is necessary.
...
- 463
0
votes
1
answer
574
views
How to use javapackager to create executable file for my code? [closed]
I saw this stack overflow post to know how to create executable files from java source , where it says to use javapackager he also says that it is included with Java JDK but I dont have any clue of ...
- 458
0
votes
3
answers
1k
views
How to restrict a class visibility in another class only that are in different packages?
I have the following package and class structure in my project,
package de.mycompany.jakarta.order;
import de.mycompany.ordermanagement.order.OrderCancellationService;
public class DrugOrderManager {
...
- 501
0
votes
1
answer
73
views
When or which type of java packages are called native? [closed]
Recently I was improving my understanding on Regular Expressions by reading Mastering Regular Expressions Third Edition by Jeffrey E. F. Friedl, there is mentions Java has had a native regex package . ...
- 21
0
votes
1
answer
64
views
Access class from another package
I have two folders in a folder called asdsad
.
├── a
│ └── A.java
├── b
│ └── B.java
This is my A.java
package asdsad.a;
public class A {
public A() {
}
public int number;
}
...
- 1,821