Execution failed for task ':app:packageDebug'. > A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade > java.io.IOException: Failed to generate v1 signature
Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.6.1:compile (default-compile) on project a2: Compilation failure [ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?