Error rebuilding in Android Studio

[EAG-es]

Hi.
I had to comment the lines:

       /*
              beforeDeployment { 

              MavenDeployment deployment -> signing.signPom(deployment) }

              repository(url: "https://oss.sonatype.org/service/local/staging/deploy/maven2/") {
                  authentication(userName: sonatypeUsername, password: sonatypePassword)
              }

              snapshotRepository(url: "https://oss.sonatype.org/content/repositories/snapshots/") {
                  authentication(userName: sonatypeUsername, password: sonatypePassword)
              }
      */

in build.graddle (miniweb-android and miniweb-core)

And update in miniweb-android:

      android {
          **compileSdkVersion 30**
          buildToolsVersion "21.1.2"
      
          defaultConfig {
              minSdkVersion 14
             **targetSdkVersion 30**
              versionCode 1
              versionName "1.0"
          }

Perhaps commenting Android Studio building process could help to new students.
¿Does Restful API work like Java-RS? (I did not find which implementation uses)
For Java non Android platform, do you have a maven project? (it would be great developing both platforms in copycat).

Thanks