Build Failed In Sample SimpleMaths.java extension

Open Source Development Extension Development
1

CODE
package com.nisarga;

// Only these imports are required to interact with Kodular
import com.google.appinventor.components.annotations.*;
import com.google.appinventor.components.runtime.*;
import com.google.appinventor.components.common.*;

@DesignerComponent(version = 1, // Update version here, You must do for each new release to upgrade your extension
               description = "Simple Maths extension created by you",
               category = ComponentCategory.EXTENSION,
               nonVisible = true,
               iconName = "images/extension.png") // Change your extension's icon from here; can be a direct url
@SimpleObject(external = true)
public class SimpleMaths extends AndroidNonvisibleComponent {

public SimpleMaths(ComponentContainer container) {
    super(container.$form());
}

@SimpleFunction(description = "Simple addition of two numbers")
public int Add(int a, int b) {
    return a + b;
}

@SimpleFunction(description = "Simple subtraction of two numbers")
public int Subtract(int a, int b) {
    return a - b;
}
}

After giving ant command

$ ant
Buildfile: C:\Users\rubyd\Desktop\Code\extension-template-master\build.xml

javac:
[javac] Compiling 1 source file to C:\Users\rubyd\Desktop\Code\extension-template-master\build\classes
[javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
[javac] C:\Users\rubyd\Desktop\Code\extension-template-master\src\com\nisarga\SimpleMaths\SimpleMaths.java:4: error: package com.google.appinventor.components.annotations does not exist
[javac] import com.google.appinventor.components.annotations.;
[javac] ^
[javac] C:\Users\rubyd\Desktop\Code\extension-template-master\src\com\nisarga\SimpleMaths\SimpleMaths.java:5: error: package com.google.appinventor.components.runtime does not exist
[javac] import com.google.appinventor.components.runtime.;
[javac] ^
[javac] C:\Users\rubyd\Desktop\Code\extension-template-master\src\com\nisarga\SimpleMaths\SimpleMaths.java:6: error: package com.google.appinventor.components.common does not exist
[javac] import com.google.appinventor.components.common.*;
[javac] ^
[javac] C:\Users\rubyd\Desktop\Code\extension-template-master\src\com\nisarga\SimpleMaths\SimpleMaths.java:14: error: cannot find symbol
[javac] public class SimpleMaths extends AndroidNonvisibleComponent {
[javac] ^
[javac] symbol: class AndroidNonvisibleComponent
[javac] C:\Users\rubyd\Desktop\Code\extension-template-master\src\com\nisarga\SimpleMaths\SimpleMaths.java:8: error: cannot find symbol
[javac] @DesignerComponent(version = 1, // Update version here, You must do for each new release to upgrade your extension
[javac] ^
[javac] symbol: class DesignerComponent
[javac] C:\Users\rubyd\Desktop\Code\extension-template-master\src\com\nisarga\SimpleMaths\SimpleMaths.java:13: error: cannot find symbol
[javac] @SimpleObject(external = true)
[javac] ^
[javac] symbol: class SimpleObject
[javac] C:\Users\rubyd\Desktop\Code\extension-template-master\src\com\nisarga\SimpleMaths\SimpleMaths.java:16: error: cannot find symbol
[javac] public SimpleMaths(ComponentContainer container) {
[javac] ^
[javac] symbol: class ComponentContainer
[javac] location: class SimpleMaths
[javac] C:\Users\rubyd\Desktop\Code\extension-template-master\src\com\nisarga\SimpleMaths\SimpleMaths.java:20: error: cannot find symbol
[javac] @SimpleFunction(description = "Simple addition of two numbers")
[javac] ^
[javac] symbol: class SimpleFunction
[javac] location: class SimpleMaths
[javac] C:\Users\rubyd\Desktop\Code\extension-template-master\src\com\nisarga\SimpleMaths\SimpleMaths.java:25: error: cannot find symbol
[javac] @SimpleFunction(description = "Simple subtraction of two numbers")
[javac] ^
[javac] symbol: class SimpleFunction
[javac] location: class SimpleMaths
[javac] 9 errors
[javac] 1 warning

BUILD FAILED
C:\Users\rubyd\Desktop\Code\extension-template-master\build.xml:29: Compile failed; see the compiler error output for details.

Total time: 0 seconds

How to fix?

1 Like
2

It looks like copy pasted code

1 Like
3

Yes it is!

4

I ran the same build with online cloud compiler it worked but it is not working in PC.

5

You are adding extension maybe you should change Category of your extension ,Package and some other small change then you might try it should work.

2 Likes
6

I think there is problem with my JAVA version.
I am currently using JAVA 8

7

No there is no problem

8

Your extension templete does not have libs

9

what? how to add?

10

According to the readme:

Since you've already cloned it, you should instead run

git submodule update --init

to download the libraries.

4 Likes