Setup framework and environment.

.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="target/generated-sources/annotations">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="ignore_optional_problems" value="true"/>
+			<attribute name="m2e-apt" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="target/generated-test-sources/test-annotations">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="ignore_optional_problems" value="true"/>
+			<attribute name="m2e-apt" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>

.gitignore

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+/bin/
+/target/

.gitpod.yml

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+---
+# List the start up tasks. Learn more https://www.gitpod.io/docs/config-start-tasks/
+tasks:
+  - init: sh coauthors.sh
+vscode:
+  extensions:
+    - redhat.java
+    - mhutchie.git-graph
+    - vscjava.vscode-maven

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>SigKeeper</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+	<filteredResources>
+		<filter>
+			<id>1637296237910</id>
+			<name></name>
+			<type>30</type>
+			<matcher>
+				<id>org.eclipse.core.resources.regexFilterMatcher</id>
+				<arguments>node_modules|.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
+			</matcher>
+		</filter>
+	</filteredResources>
+</projectDescription>

.settings/org.eclipse.core.resources.prefs

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+eclipse.preferences.version=1
+encoding/<project>=UTF-8
+encoding/src=UTF-8

.settings/org.eclipse.jdt.apt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.apt.aptEnabled=false

.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=ignore
+org.eclipse.jdt.core.compiler.processAnnotations=disabled
+org.eclipse.jdt.core.compiler.release=disabled
+org.eclipse.jdt.core.compiler.source=1.8

.settings/org.eclipse.m2e.core.prefs

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+activeProfiles=
+eclipse.preferences.version=1
+resolveWorkspaceProjects=true
+version=1

coauthors.sh

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+npm i -g git-mob
+cat <<-EOF > ~/.git-coauthors
+{
+  "coauthors": {
+    "sig": {
+      "name": "sigonasr2",
+      "email": "sigonasr2@gmail.com"
+    }
+  }
+}
+EOF
+git mob sig 
+cat <<-EOF > .git/hooks/prepare-commit-msg
+#!/usr/bin/env node
+let exec = require('child_process').exec,
+    fs = require('fs');
+const commitMessage = process.argv[2];
+// expect .git/COMMIT_EDITMSG
+if(/COMMIT_EDITMSG/g.test(commitMessage)){
+    let contents = "";
+    exec("git mob-print",
+      function (err, stdout) {
+        if(err) {
+            process.exit(0);
+        }
+        // opens .git/COMMIT_EDITMSG
+        contents = fs.readFileSync(commitMessage);
+        if(contents.indexOf(stdout.trim()) !== -1) {
+            process.exit(0);
+        }
+        const commentPos = contents.indexOf('# ');
+        const gitMessage = contents.slice(0, commentPos);
+        const gitComments = contents.slice(commentPos)
+        fs.writeFileSync(commitMessage, gitMessage + stdout + gitComments);
+        process.exit(0);
+    });
+}
+EOF
+chmod +x .git/hooks/prepare-commit-msg
+cd /workspace/SigKeeper
+echo "Environment is setup!"

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<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>SigKeeper</groupId>
+  <artifactId>SigKeeper</artifactId>
+  <version>0</version>
+
+  <name>SigKeeper</name>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+  </properties>
+
+  <dependencies>
+  </dependencies>
+
+  <build>
+    <sourceDirectory>src</sourceDirectory>
+    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
+      <plugins>
+        <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
+        <plugin>
+          <artifactId>maven-clean-plugin</artifactId>
+          <version>3.1.0</version>
+        </plugin>
+        <!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
+        <plugin>
+          <artifactId>maven-resources-plugin</artifactId>
+          <version>3.0.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.8.0</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <version>2.22.1</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-jar-plugin</artifactId>
+          <version>3.0.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-install-plugin</artifactId>
+          <version>2.5.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-deploy-plugin</artifactId>
+          <version>2.8.2</version>
+        </plugin>
+        <!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
+        <plugin>
+          <artifactId>maven-site-plugin</artifactId>
+          <version>3.7.1</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-project-info-reports-plugin</artifactId>
+          <version>3.0.0</version>
+        </plugin>
+         <plugin>
+        <artifactId>maven-assembly-plugin</artifactId>
+        <configuration>
+          <archive>
+            <manifest>
+              <mainClass>sig.SigKeeper</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>
+      </plugins>
+    </pluginManagement>
+  </build>
+</project>

run

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+mvn compile assembly:single
+java -jar target/SigKeeper-0-jar-with-dependencies.jar

src/sig/SigKeeper.java

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+package sig;
+
+class SigKeeper{
+    public static void main(String[] args) {
+        System.out.println("Hello World!");
+    }
+}