Executable jar file using Ant and Maven - Yash-777/LearnJava GitHub Wiki

Stack Overflow Yash - Runnable jar

Maven POM.xml 

<project
  xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>io.github.yash-777</groupId>
  <artifactId>ScreenRecorder</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>
  <name>ScreenRecorder</name>
  <url>http://maven.apache.org</url>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <slf4j-api.version>1.7.2</slf4j-api.version>
    <slf4j-simple.version>1.7.2</slf4j-simple.version>
    <maven-compiler-plugin.version>3.5.1</maven-compiler-plugin.version>
    <maven-source-plugin.version>3.0.1</maven-source-plugin.version>
    <maven-jar-plugin-version>3.1.0</maven-jar-plugin-version>
    <!--  Java 7  -->
    <java.version>1.7</java.version>
    <maven.compiler.target>${java.version}</maven.compiler.target>
    <maven.compiler.source>${java.version}</maven.compiler.source>
    <!-- Download the jar file classes and place into runnable jar. -->
    <maven-shade-plugin-version>3.1.1</maven-shade-plugin-version>
    <xuggle-groupId>xuggle</xuggle-groupId>
    <slf4j-groupId>org.slf4j</slf4j-groupId>
  </properties>
  <!-- https://maven.apache.org/pom.html -->
  <repositories>
    <repository>
      <id>xuggle repo</id>
      <url>https://files.liferay.com/mirrors/xuggle.googlecode.com/svn/trunk/repo/share/java/</url>
      <releases>
        <enabled>true</enabled>
        <updatePolicy>never</updatePolicy>
      </releases>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </repository>
  </repositories>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <!-- https://files.liferay.com/mirrors/xuggle.googlecode.com/ -->
    <dependency>
      <groupId>xuggle</groupId>
      <artifactId>xuggle-xuggler</artifactId>
      <version>5.4</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>${slf4j-api.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-simple</artifactId>
      <version>${slf4j-simple.version}</version>
    </dependency>
  </dependencies>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <resources>
      <resource>
        <targetPath>./libClasspath</targetPath>
        <filtering>false</filtering>
        <directory>${project.build.directory}/libs</directory>
        <includes>
          <include>**/*</include>
        </includes>
      </resource>
    </resources>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>${maven-compiler-plugin.version}</version>
        <configuration>
          <encoding>ISO-8859-1</encoding>
          <source>${maven.compiler.source}</source>
          <target>${maven.compiler.target}</target>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <executions>
          <execution>
            <id>copy-dependencies</id>
            <phase>prepare-package</phase>
            <goals>
              <goal>copy-dependencies</goal>
            </goals>
            <configuration>
              <outputDirectory>${project.build.directory}/libs</outputDirectory>
              <overWriteReleases>false</overWriteReleases>
              <overWriteSnapshots>false</overWriteSnapshots>
              <overWriteIfNewer>true</overWriteIfNewer>
            </configuration>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        <version>${maven-jar-plugin-version}</version>
        <!-- https://stackoverflow.com/a/12281971/5081877 -->
        <configuration>
          <archive>
            <manifest>
              <mainClass>io.github.yash777.xuggler.VideoFrame</mainClass>
              <!-- <arguments><argument>arg0</argument><argument>arg1</argument></arguments> -->
              <addClasspath>true</addClasspath>
              <classpathPrefix>libClasspath</classpathPrefix>
            </manifest>
            <manifestEntries>
              <Class-Path>.</Class-Path>
            </manifestEntries>
          </archive>
          <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
          </descriptorRefs>
          <!-- <finalName>webappJar</finalName> -->
          <charset>utf-8</charset>
        </configuration>
      </plugin>
      <!-- use maven-shade-plugin to pull in dependencies to make the standalone .jar. -->
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>${maven-shade-plugin-version}</version>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
            <configuration>
              <createSourcesJar>false</createSourcesJar>
              <shadedArtifactAttached>false</shadedArtifactAttached>
              <artifactSet>
                <includes>
                  <include>${xuggle-groupId}:*</include>
                  <include>${slf4j-groupId}:*</include>
                </includes>
                <excludes>
                  <exclude>junit:junit</exclude>
                </excludes>
              </artifactSet>
              <!-- <relocations><relocation><pattern>org.eclipse.jetty</pattern>
              <shadedPattern>org.seleniumhq.jetty7</shadedPattern></relocation></relocations> -->
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

Create a fat Jar file – Maven Shade Plugin mkyong.com

<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
  <plugin>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.5.1</version>
    <configuration>
      <source>1.8</source>
      <target>1.8</target>
      <encoding>UTF-8</encoding>
    </configuration>
  </plugin>
  <plugin>
    <artifactId>maven-shade-plugin</artifactId>
    <version>3.0.0</version>
    <executions>
      <execution>
        <phase>package</phase>
        <goals>
          <goal>shade</goal>
        </goals>
        <configuration>
          <transformers>
          <!-- <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer"> -->
            <transformer>
              <manifestEntries>
                <Main-Class>com.github.yash777.MyRunnableClass</Main-Class>
                <Build-Number>1.0</Build-Number>
                <Purpose>Add Main-Class to manifest file: mvn package</Purpose>
              </manifestEntries>
            </transformer>
          </transformers>
        </configuration>
      </execution>
    </executions>
  </plugin>
</plugins>
</build>

In a class-based object-oriented language, in general, state is carried by instances, methods are carried by classes, and inheritance is only of structure and behavior.

Method signature: It consists of method name and parameter list (number/type/order of the parameters). methodName(parametersList y). An instance method in a subclass with the same signature and return type as an instance method in the super-class overrides the super-class's method.

Java OOP concepts
Class  - Collection of a common features of a group of object [static/instance Fields, blocks and Methods]
Object - Instance of a class (instance fields)
Abstraction - Process of hiding complex info and providing required info like API, Marker Interfaces ...
Encapsulation(Security) - Class Binding up with data members(fields) and member functions.
Inheritance  (Reusability by placing common code in single class)
 1. Multilevel - {A -> B -> C} 2. Multiple - Diamond problem {A <- (B) -> C} [Java not supports] 3. Cyclic {A <-> B} [Java not supports]
 * Is-A   Relation - Class A extends B
 * Hash-A Relation - Class A { B obj = new B(); } - (Composition/Aggregation)
Polymorphism (Flexibility) 1. Compile-Time Overloading    2. Runtime Overriding  [Greek - "many forms"]


int[] arr = {1,2,3}; int arrLength = arr.length;   // Fixed length of sequential blocks to hold same data type
String str = "Yash"; int strLength = str.length(); // Immutable Object value can't be changed.

List<?> collections = new ArrayList<String>(); int collectionGroupSize = collections.size();
Map<?, ?> mapEntry = new HashMap<String, String>();
Set<?> keySet = mapEntry.keySet(); // Set of Key's
Set<?> entrySet = mapEntry.entrySet(); // Set of Entries [Key, Value]

// Immutable Objects once created they can't be modified. final class Integer/String/Employee
Integer val = Integer.valueOf("100"); String str2 = String.valueOf(100); // Immutable classes
final class Employee { // All Wrapper classes, java.util.UUID, java.io.File ...
    private final String empName; // Field as Final(values can be assigned only once) Only getter functions.
    public Employee(String name) { this.empName = name; }
}

Native Java Code for Hashtable.h, Hashtable.cpp SQL API.

You can check your current JDK and JRE versions on your command prompt respectively,

  • JDK javac -version [C:\Program Files\Java\jdk1.8.0_121\bin] o/p: javac 1.8.0_121
  • JRE java -version [C:\Program Files\Java\jdk1.8.0_121\bin] o/P: java version "1.8.0_102"

JAVA_HOME - Must be set to JDK otherwise maven projects leads to compilation error. [ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK? C:\Softwares\OpenJDK\, 7-zip

Fatal error compiling: invalid target release: JRE and JDK must be of same version 1.8.0.XXX

Disable TLS 1.0 and 1.1security-libs/javax.net.ssl: TLS 1.0 and 1.1 are versions of the TLS protocol that are no longer considered secure and have been superseded by more secure and modern versions (TLS 1.2 and 1.3).

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