class file for org.ros.internal.message.Message not found

[SyuanLiao]

Hi all,

I tried to do this:

@Override
public void onStart(final ConnectedNode connectedNode){
    final Publisher<std_msgs.String> pubString =
            connectedNode.newPublisher("table_talk", std_msgs.String._TYPE);

    connectedNode.executeCancellableLoop(new CancellableLoop() {
        @Override
        protected void loop() throws InterruptedException {
            std_msgs.String msg = pubString.newMessage();
            msg.setData("hello");
            pubString.publish(msg);
            Thread.sleep(1000);
        }
    });
}

then I got the error message:

error: cannot access Message
 msg.setData("Hello");
                   ^
  class file for org.ros.internal.message.Message not found

And this is my build.gradle:

buildscript {
    repositories {
        google()
        jcenter()
        maven { url 'https://github.com/rosjava/rosjava_mvn_repo/raw/master' }
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.3'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()

        maven { url 'https://github.com/rosjava/rosjava_mvn_repo/raw/master' }
        mavenCentral()

    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

another one:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "test.android"
        minSdkVersion 15
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

    implementation 'org.ros.rosjava_core:rosjava:[0.1,0.2)'
    implementation 'org.ros.android_core:android_10:[0.3,0.4)'
    implementation 'org.ros.android_core:android_15:[0.3,0.4)'
    implementation 'org.ros.rosjava_messages:std_msgs:[0.5, 0.6)'
}

May somebody help me? Thank you!!

[colin-broderick]

Same problem. I'm working from what looks like the same example as SyuanLiao: https://github.com/ollide/rosjava_android_template/tree/master/rosandroid-example-app/src/main/java/org/ollide/rosandroid

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.example.rosdroid"
        minSdkVersion 15
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.google.android.material:material:1.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

    implementation 'org.ros.android_core:android_honeycomb_mr2:0.1.2'
    implementation 'org.ros.android_core:android_gingerbread_mr1:0.1.2'
    implementation 'org.ros.rosjava_core:rosjava:0.3.6'
    implementation 'org.ros.rosjava_messages:std_msgs:0.5.11'
}

[Goochaozheng]

Solved the same problem according to this.
Adding message related dependencies manually to your build.gradle file:

implementation 'org.ros.rosjava_bootstrap:message_generation:[0.3, 0.4)'

It looks like newer version of gradle fails to resolve these second-level dependencies properly.