How can I create an executable JAR with dependencies using Maven?

How can I create an executable JAR with dependencies using Maven?

I want to package my project in a single executable JAR for distribution.

How can I make Maven package all dependency JARs into my JAR?

Answer:

<build>
  <plugins>
    <plugin>
      <artifactId>maven-assembly-plugin</artifactId>
      <configuration>
        <archive>
          <manifest>
            <mainClass>fully.qualified.MainClass</mainClass>
          </manifest>
        </archive>
        <descriptorRefs>
          <descriptorRef>jar-with-dependencies</descriptorRef>
        </descriptorRefs>
      </configuration>
    </plugin>
  </plugins>
</build>

and you run it with

mvn clean compile assembly:single

Compile goal should be added before assembly:single or otherwise the code on your own project is not included.

See more details in comments.

Commonly this goal is tied to a build phase to execute automatically. This ensures the JAR is built when executing mvn install or performing a deployment/release.

<plugin>
  <artifactId>maven-assembly-plugin</artifactId>
  <configuration>
    <archive>
      <manifest>
        <mainClass>fully.qualified.MainClass</mainClass>
      </manifest>
    </archive>
    <descriptorRefs>
      <descriptorRef>jar-with-dependencies</descriptorRef>
    </descriptorRefs>
  </configuration>
  <executions>
    <execution>
      <id>make-assembly</id> <!-- this is used for inheritance merges -->
      <phase>package</phase> <!-- bind to the packaging phase -->
      <goals>
        <goal>single</goal>
      </goals>
    </execution>
  </executions>
</plugin>

http://stackoverflow.com/questions/574594/how-can-i-create-an-executable-jar-with-dependencies-using-maven

Initialization of an ArrayList in one line

by Blogger 4:43:00 AM arraylist collections initialization java

Initialization of an ArrayList in one line

I want to create a list of options for testing purposes. At first, I did this:

ArrayList<String> places = new ArrayList<String>();
places.add("Buenos Aires");
places.add("Córdoba");
places.add("La Plata");

Then I refactored the code as follows:

ArrayList<String> places = new ArrayList<String>(
    Arrays.asList("Buenos Aires", "Córdoba", "La Plata"));

Is there a better way to do this?

Answer:

Actually, probably the "best" way to initialize the ArrayList is the method you wrote, as it does not need to create a new List in any way:

ArrayList<String> list = new ArrayList<String>();
list.add("A");
list.add("B");
list.add("C");

The catch is that there is quite a bit of typing required to refer to that list instance.

There are alternatives, such as making an anonymous inner class with an instance initializer (also known as an "double brace initialization"):

ArrayList<String> list = new ArrayList<String>() {{
    add("A");
    add("B");
    add("C");
}};

However, I'm not too fond of that method because what you end up with is a subclass of ArrayListwhich has an instance initializer, and that class is created just to create one object -- that just seems like a little bit overkill to me.

What would have been nice was if the Collection Literals proposal for Project Coin was accepted (it was slated to be introduced in Java 7, but it's not likely to be part of Java 8 either.):

List<String> list = ["A", "B", "C"];

Unfortunately it won't help you here, as it will initialize an immutable List rather than an ArrayList, and furthermore, it's not available yet, if it ever will be.

http://stackoverflow.com/questions/1005073/initialization-of-an-arraylist-in-one-line

How do I test a class that has private methods, fields or inner classes?

by Blogger 4:41:00 AM java junit tdd Unit-Testing

How do I test a class that has private methods, fields or inner classes?

How do I use JUnit to test a class that has internal private methods, fields or nested classes?

It seems bad to change the access modifier for a method just to be able to run a test.

Solution:

If you have somewhat of a legacy application, and you're not allowed to change the visibility of your methods, the best way to test private methods is to use reflection.

Internally we're using helpers to get/set private and private static variables as well as invoke private and private static methods. The following patterns will let you do pretty much anything related to the private methods and fields. Of course you can't change private static finalvariables through reflection.

Method method = targetClass.getDeclaredMethod(methodName, argClasses);
method.setAccessible(true);
return method.invoke(targetObject, argObjects);

And for fields:

Field field = targetClass.getDeclaredField(fieldName);
field.setAccessible(true);
field.set(object, value);

Notes:
1. targetClass.getDeclaredMethod(methodName, argClasses) lets you look into privatemethods. The same thing applies for getDeclaredField.
2. The setAccessible(true) is required to play around with privates.

http://stackoverflow.com/questions/34571/how-do-i-test-a-class-that-has-private-methods-fields-or-inner-classes

In Java, difference between default, public, protected, and private

by Blogger 4:40:00 AM access-modifiers java private protected public

In Java, difference between default, public, protected, and private

In Java, are there clear rules on when to use each of access modifiers, namely the default (package private), public, protected and private, while making class and interface and dealing with inheritance?

Answer:

The official tutorial may be of some use to you.

            | Class | Package | Subclass | Subclass | World
            |       |         |(same pkg)|(diff pkg)| 
————————————+———————+—————————+——————————+——————————+————————
public      |   +   |    +    |    +     |     +    |   +     
————————————+———————+—————————+——————————+——————————+————————
protected   |   +   |    +    |    +     |     +    |   o     
————————————+———————+—————————+——————————+——————————+————————
no modifier |   +   |    +    |    +     |     o    |   o
————————————+———————+—————————+——————————+——————————+————————
private     |   +   |    o    |    o     |     o    |   o

+ : accessible
o : not accessible

source : http://stackoverflow.com/questions/215497/in-java-difference-between-default-public-protected-and-private

How to efficiently iterate over each Entry in a Map?

by Blogger 4:38:00 AM collections dictionary iteration java

How to efficiently iterate over each Entry in a Map?

If I have an object implementing the Map interface in Java and I wish to iterate over every pair contained within it, what is the most efficient way of going through the map?

Will the ordering of elements depend on the specific map implementation that I have for the interface?

Solution:

Map<String, String> map = ...
for (Map.Entry<String, String> entry : map.entrySet())
{
    System.out.println(entry.getKey() + "/" + entry.getValue());
}

http://stackoverflow.com/questions/46898/how-to-efficiently-iterate-over-each-entry-in-a-map

Is there a unique Android device ID?

by Blogger 4:37:00 AM android java uniqueidentifier

Is there a unique Android device ID?

Do Android devices have a unique ID, and if so, what is a simple way to access it using Java?

Solution :

Settings.Secure#ANDROID_ID returns the Android ID as an unique for each user 64-bit hex string.

import android.provider.Settings.Secure;

private String android_id = Secure.getString(getContext().getContentResolver(),
                                                        Secure.ANDROID_ID);

Update: 06/05/2015

~~When reviewing this as a possible solution, please consider Joe's answer below instead as an alternative.~~

http://stackoverflow.com/questions/2785485/is-there-a-unique-android-device-id

How to convert a String to an int in Java?

by Blogger 4:35:00 AM data-type-conversion int java string type-conversion

How to convert a String to an int in Java?

How can I convert a String to an int in Java?

My String contains only numbers and I want to return the number it represents.

For example, given the string "1234" the result should be the number 1234.

Solution:

int foo = Integer.parseInt("1234");

See the Java Documentation for more information.

(If you have it in a StringBuilder (or the ancient StringBuffer), you'll need to do Integer.parseInt(myBuilderOrBuffer.toString()); instead).

http://stackoverflow.com/questions/5585779/how-to-convert-a-string-to-an-int-in-java

All In One Script

How can I create an executable JAR with dependencies using Maven?

How can I create an executable JAR with dependencies using Maven?

Answer:

Initialization of an ArrayList in one line

Initialization of an ArrayList in one line

Answer:

How do I test a class that has private methods, fields or inner classes?

How do I test a class that has private methods, fields or inner classes?

Solution:

In Java, difference between default, public, protected, and private

In Java, difference between default, public, protected, and private

Answer:

How to efficiently iterate over each Entry in a Map?

How to efficiently iterate over each Entry in a Map?

Solution:

Is there a unique Android device ID?

Is there a unique Android device ID?

Solution :

Update: 06/05/2015

How to convert a String to an int in Java?

How to convert a String to an int in Java?

Solution:

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