How to solve: "error: cannot find symbol class ..." after converting Java class to Kotlin?

I'm trying to start with Kotlin by converting some Java classes of my project to Kotlin and create a mixed Java/Kotlin project. In order to configure the environment I did the following:

Downloaded the latest version of Kotlin plugin (1.0.2);
On the top level gradle.plugin I've added: classpath "org.jetbrains.kotlin:kotlin-android-extensions:1.0.2" in the dependencies section;
In my module's gradle plugin I've added: compile "org.jetbrains.kotlin:kotlin-stdlib:1.0.2" in the dependencies section;
I've picked the POJO class I wanted to convert to kotlin, selected from menu Code -> Convert Java File to Kotlin File;
After that, all Java classes that were importing the converted class started to display: error: cannot find symbol class Chat. Below are the original class, the converted class and the log:

Original Java class:

package br.com.gogame.model;

import com.google.gson.Gson;
import com.orm.SugarRecord;
import com.orm.dsl.Ignore;

import java.io.Serializable;
import java.util.List;

import br.com.gogame.model.enums.ChatType;

/**
 * Created by edgar on 11-Apr-16.
 */
public class Chat extends SugarRecord implements Serializable {

    private String title;
    private String thumbnail;
    private ChatType chat_type;
    private long chat_id;
    private int num_of_members;
    private long user_id;
    @Ignore
    private List<Long> users;

    public Chat() {
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getThumbnail() {
        return thumbnail;
    }

    public void setThumbnail(String thumbnail) {
        this.thumbnail = thumbnail;
    }

    public ChatType getChat_type() {
        return chat_type;
    }

    public void setChat_type(ChatType chat_type) {
        this.chat_type = chat_type;
    }

    public long getChat_id() {
        return chat_id;
    }

    public void setChat_id(long chat_id) {
        this.chat_id = chat_id;
    }

    public int getNum_of_members() {
        return num_of_members;
    }

    public void setNum_of_members(int num_of_members) {
        this.num_of_members = num_of_members;
    }

    public long getUser_id() {
        return user_id;
    }

    public void setUser_id(long user_id) {
        this.user_id = user_id;
    }

    public List<Long> getUsers() {
        return users;
    }

    public void setUsers(List<Long> users) {
        this.users = users;
    }

    @Override
    public String toString() {
        Gson gson = new Gson();
        return gson.toJson(this, Chat.class);
    }
}

Converted Kotlin class

package br.com.gogame.model

import com.orm.SugarRecord
import com.orm.dsl.Ignore

import java.io.Serializable

import br.com.gogame.model.enums.ChatType

/**
 * Created by edgar on 11-Apr-16.
 */
class Chat : SugarRecord(), Serializable {
    var title: String? = null
    var thumbnail: String? = null
    var chat_type: ChatType? = null
    var chat_id: Long = 0
    var num_of_members: Int = 0
    var user_id: Long = 0
    @Ignore
    var users: List<Long>? = null
}

Error Log:

C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\commons\infra\App.java
    Error:(8, 42) error: cannot find symbol class DaggerMainComponent
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\view\fragments\FragmentChats.java
    Error:(23, 27) error: cannot find symbol class Chat
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\communication\post_office\GCMOffice.java
    Error:(25, 27) error: cannot find symbol class Chat
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\controller\util\JSONParser.java
    Error:(22, 27) error: cannot find symbol class Chat
    Error:(98, 17) error: cannot find symbol class Chat
    Error:(111, 60) error: cannot find symbol class Chat
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\controller\ChatController.java
    Error:(23, 27) error: cannot find symbol class Chat
    Error:(41, 12) error: cannot find symbol class Chat
    Error:(46, 12) error: cannot find symbol class Chat
    Error:(62, 32) error: cannot find symbol class Chat
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\commons\util\FakeDataProvider.java
    Error:(7, 27) error: cannot find symbol class Badge
    Error:(8, 27) error: cannot find symbol class Chat
    Error:(21, 24) error: cannot find symbol class Badge
    Error:(94, 24) error: cannot find symbol class Chat
    Error:(106, 20) error: cannot find symbol class Chat
    Error:(118, 20) error: cannot find symbol class Chat
    Error:(130, 20) error: cannot find symbol class Chat
    Error:(142, 20) error: cannot find symbol class Chat
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\controller\util\NotificationFactory.java
    Error:(19, 27) error: cannot find symbol class Chat
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\model\dao\ChatDAO.java
    Error:(13, 27) error: cannot find symbol class Chat
    Error:(24, 29) error: cannot find symbol class Chat
    Error:(46, 19) error: cannot find symbol class Chat
    Error:(60, 19) error: cannot find symbol class Chat
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\model\dao\ChatUserDAO.java
    Error:(7, 27) error: cannot find symbol class Chat
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\model\dao\Datamanager.java
    Error:(9, 27) error: cannot find symbol class Chat
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\model\dao\LocalUserDAO.java
    Error:(8, 27) error: cannot find symbol class Chat
    Error:(145, 24) error: cannot find symbol class Chat
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\view\adapters\BadgesAdapter.java
    Error:(15, 27) error: cannot find symbol class Badge
    Error:(21, 52) error: cannot find symbol class Badge
    Error:(25, 60) error: cannot find symbol class Badge
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\controller\FriendshipController.java
    Error:(21, 27) error: cannot find symbol class Chat
    Error:(195, 79) error: cannot find symbol class Chat
    Error:(33, 8) error: dagger.internal.codegen.ComponentProcessor was unable to process this class because not all of its dependencies could be resolved. Check for compilation errors or a circular dependency with generated code.
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\controller\MessageController.java
    Error:(23, 27) error: cannot find symbol class Chat
    Error:(91, 50) error: cannot find symbol class Chat
    Error:(117, 61) error: cannot find symbol class Chat
    Error:(128, 65) error: cannot find symbol class Chat
    Error:(216, 46) error: cannot find symbol class Chat
    Error:(34, 8) error: dagger.internal.codegen.ComponentProcessor was unable to process this class because not all of its dependencies could be resolved. Check for compilation errors or a circular dependency with generated code.
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\view\activities\ActivityCanvas.java
    Error:(38, 27) error: cannot find symbol class Chat
    Error:(64, 13) error: cannot find symbol class Chat
    Error:(53, 8) error: dagger.internal.codegen.ComponentProcessor was unable to process this class because not all of its dependencies could be resolved. Check for compilation errors or a circular dependency with generated code.
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\view\activities\ActivityFriends.java
    Error:(22, 27) error: cannot find symbol class Chat
    Error:(196, 13) error: cannot find symbol class Chat
    Error:(39, 8) error: dagger.internal.codegen.ComponentProcessor was unable to process this class because not all of its dependencies could be resolved. Check for compilation errors or a circular dependency with generated code.
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\view\adapters\ChatAdapter.java
    Error:(26, 27) error: cannot find symbol class Chat
    Error:(35, 50) error: cannot find symbol class Chat
    Error:(43, 58) error: cannot find symbol class Chat
    Error:(35, 8) error: dagger.internal.codegen.ComponentProcessor was unable to process this class because not all of its dependencies could be resolved. Check for compilation errors or a circular dependency with generated code.
    C:\SIBEN\Edgar\workspace\GoGame\current\app\src\main\java\br\com\gogame\commons\infra\dagger\MainComponent.java
    Error:(42, 8) error: dagger.internal.codegen.ComponentProcessor was unable to process this interface because not all of its dependencies could be resolved. Check for compilation errors or a circular dependency with generated code.
    Error:Execution failed for task ':app:compileDebugJavaWithJavac'.
    > Compilation failed; see the compiler error output for details.
    Information:BUILD FAILED
    Information:Total time: 7.406 secs
    Information:51 errors
    Information:4 warnings
    Information:See complete output in console

How do I convert Java code to Kotlin?

To convert Java code to Kotlin, open the Java file in Android Studio, and select Code > Convert Java File to Kotlin File. Alternatively, create a new Kotlin file (File > New > Kotlin File/Class), and then paste your Java code into that file.

What does :: class Java do in Kotlin?

java . For each primitive type, there are two different Java classes, and Kotlin provides ways to get both. For example, Int::class. java will return the class instance representing the primitive type itself, corresponding to Integer.

What is the error Cannot find symbol in Java?

The cannot find symbol error, also found under the names of symbol not found and cannot resolve symbol , is a Java compile-time error which emerges whenever there is an identifier in the source code which the compiler is unable to work out what it refers to.

What does :: Class mean in Kotlin?

:: is just a way to write a lambda expression basically we can use this to refer to a method i.e a member function or property for example class Person (val name: String, val age: Int) Now we can write this to access the person which has the maximium age.

As pointed out by user @Ilya, the problem was that the .kt files weren't being compiled and, therefore, couldn't be recognized when I tried to deploy the app in the device. To solve this problem, all I had to do was add apply plugin: 'kotlin-android' in my module's gradle.build as indicated in the links he has pointed in his comment, and that's all! It works now!

How to solve: "error: cannot find symbol class ..." after converting Java class to Kotlin?

Tags:

android

kotlin

Original Java class:

Converted Kotlin class

Error Log:

E. Fernandes

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How to solve: "error: cannot find symbol class ..." after converting Java class to Kotlin?

Tags:

android

kotlin

Original Java class:

Converted Kotlin class

Error Log:

E. Fernandes

People also ask

1 Answers

E. Fernandes

Related questions

Recent Activity

Donate For Us