added null checks to AppUploader constructor

.settings/org.eclipse.buildship.core.prefs

@@ -0,0 +1,13 @@
+arguments=--init-script /home/taz/.cache/jdtls/config/org.eclipse.osgi/148/0/.cp/gradle/init/init.gradle
+auto.sync=false
+build.scans.enabled=false
+connection.gradle.distribution=GRADLE_DISTRIBUTION(WRAPPER)
+connection.project.dir=
+eclipse.preferences.version=1
+gradle.user.home=
+java.home=/usr/lib/jvm/java-17-openjdk
+jvm.arguments=
+offline.mode=false
+override.workspace.settings=true
+show.console.view=true
+show.executions.view=true

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

@@ -0,0 +1,4 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=17
+org.eclipse.jdt.core.compiler.compliance=17
+org.eclipse.jdt.core.compiler.source=17

src/main/java/io/github/lambdatest/gradle/AppUploader.java

@@ -13,6 +13,9 @@ public class AppUploader {
     private String appFilePath;
 
     public AppUploader(String username, String accessKey, String appFilePath) {
+        if (username == null || accessKey == null || appFilePath == null)
+            throw new IllegalArgumentException("Arguments cannot be null");
+
         this.username = username;
         this.accessKey = accessKey;
         this.appFilePath = appFilePath;