Question

I don’t understand why the compiler does not warn me about not catching or throwing an SQLException. Here’s the situation:

I have defined this interface:

public interface GenericDatabaseManager {
    public void createTables(DataBase model) throws SQLException;
}

Then I created this class that implements the given interface:

public class SqliteHelper extends SQLiteOpenHelper implements
        GenericDatabaseManager {

    @Override
    public void createTables(DataBase model) throws SQLException {
        // Code that throws SQLException
    }

And finally I’m calling this SqliteHelper.createTables() from here:

public class DatabaseManager extends CoreModule {
    private boolean createUpdateDB(final String dbString, final String appId) {
        // Previous code...

        if (oldVer == -1) {
            dbCoreModel.addModel(dbModel);
            dbCoreModel.getManager().createTables(dbModel);
            return true;
        }

        // More code...
    }

}

dbCoreModel.getManager() returns a GenericDatabaseManager instance. But the compiler shows no error on dbCoreModel.getManager().createTables(dbModel); line, although this line throws an SQLException.

Does anyone have an idea about why is this happening? Thanks in advance.

EDIT: about SQLException does not need to be catched because it’s a RuntimeException. This is not true. Here’s an example:

import java.sql.SQLException;

interface Interface {
    public void throwsSQLException() throws SQLException;
}

class Test implements Interface {

    @Override
    public void throwsSQLException() throws SQLException {
        throw new SQLException();
    }
}

public class Main {

    public static void main(String[] args) {
        Interface i = new Test();
        i.throwsSQLException();
        System.out.println("Finished");
    }

}

The compiler DOES show an error in i.throwsSQLException(); in this case.

Answer 1

android.database.SQLException is a runtime exception.

In java it is not necessary to catch or declare throws for runtime exceptions. Read a detailed description about RuntimeExceptions in java here