U get default architecture value from system

Author: fvarrui

src/main/java/io/github/fvarrui/javapackager/gradle/PackagePluginExtension.java

@@ -53,7 +53,7 @@ public PackagePluginExtension(Project project) {
 		this.outputDirectory = project.getBuildDir();
 		this.scripts = new Scripts();
 		this.forceInstaller = false;
-		this.arch = Arch.x64;
+		this.arch = Arch.getDefault();
 	}
 
     public LinuxConfig linuxConfig(Closure<LinuxConfig> closure) {

src/main/java/io/github/fvarrui/javapackager/maven/PackageMojo.java

@@ -1,6 +1,7 @@
 package io.github.fvarrui.javapackager.maven;
 
 import static org.apache.commons.lang3.StringUtils.defaultIfBlank;
+import static org.apache.commons.lang3.ObjectUtils.defaultIfNull;
 import static org.twdata.maven.mojoexecutor.MojoExecutor.executionEnvironment;
 
 import java.io.File;
@@ -312,7 +313,7 @@ public class PackageMojo extends AbstractMojo {
 	/**
 	 * Architecture
 	 */
-	@Parameter(property = "arch", required = false, defaultValue="x64")
+	@Parameter(property = "arch", required = false)
 	private Arch arch;
 
 	public void execute() throws MojoExecutionException {
@@ -333,7 +334,7 @@ public void execute() throws MojoExecutionException {
 						.additionalModulePaths(additionalModulePaths)
 						.additionalResources(additionalResources)
 						.administratorRequired(administratorRequired)
-						.arch(arch)
+						.arch(defaultIfNull(arch, Arch.getDefault()))
 						.assetsDir(assetsDir)
 						.bundleJre(bundleJre)
 						.classpath(classpath)

src/main/java/io/github/fvarrui/javapackager/model/Arch.java

@@ -1,5 +1,7 @@
 package io.github.fvarrui.javapackager.model;
 
+import org.apache.commons.lang3.SystemUtils;
+
 public enum Arch {
 	aarch64("arm64", "AARCH64"), 
 	x64("amd64", "X86_64"), 
@@ -21,4 +23,22 @@ public String getRpm() {
 		return rpm;
 	}
 
+	public static Arch getDefault() {
+		switch (SystemUtils.OS_ARCH) {
+		case "x86":
+		case "i386":
+		case "i486":
+		case "i586":
+		case "i686": 
+			return x86; 
+		case "x86_64":
+		case "amd64":
+			return x64;
+		case "aarch64":
+			return aarch64;
+		default:
+		    throw new IllegalArgumentException("Unknown architecture " + SystemUtils.OS_ARCH);
+		}
+	}
+	
 }

src/main/java/io/github/fvarrui/javapackager/packagers/PackagerSettings.java

@@ -852,8 +852,7 @@ public boolean isThereFileAssociations() {
 	 * @return Mime type list string
 	 */
 	public String getMimeTypesListAsString(String separator) {
-		return StringUtils.join(fileAssociations.stream().map(fa -> fa.getMimeType()).collect(Collectors.toList()),
-				separator);
+		return StringUtils.join(fileAssociations.stream().map(fa -> fa.getMimeType()).collect(Collectors.toList()), separator);
 	}
 
 	public Arch getArch() {
@@ -867,10 +866,10 @@ public PackagerSettings arch(Arch arch) {
 
 	@Override
 	public String toString() {
-		return "PackagerSettings [outputDirectory=" + outputDirectory + ", licenseFile=" + licenseFile + ", iconFile="
-				+ iconFile + ", generateInstaller=" + generateInstaller + ", forceInstaller=" + forceInstaller
-				+ ", mainClass=" + mainClass + ", name=" + name + ", displayName=" + displayName + ", version="
-				+ version + ", description=" + description + ", url=" + url + ", administratorRequired="
+		return "PackagerSettings [" + "outputDirectory=" + outputDirectory + ", " + "licenseFile=" + licenseFile + ", "
+				+ "iconFile=" + iconFile + ", " + "generateInstaller=" + generateInstaller + ", " + "forceInstaller="
+				+ forceInstaller + ", " + "mainClass=" + mainClass + ", name=" + name + ", displayName=" + displayName
+				+ ", version=" + version + ", description=" + description + ", url=" + url + ", administratorRequired="
 				+ administratorRequired + ", organizationName=" + organizationName + ", organizationUrl="
 				+ organizationUrl + ", organizationEmail=" + organizationEmail + ", bundleJre=" + bundleJre
 				+ ", customizedJre=" + customizedJre + ", jrePath=" + jrePath + ", jdkPath=" + jdkPath