When adding constructor to the class plugin disappears from the server

[Liyakat Ali]

package com.atlassian.qantas.stash.hook;

import com.atlassian.bitbucket.hook.*;
import com.atlassian.bitbucket.hook.repository.*;
import com.atlassian.bitbucket.repository.*;
import com.atlassian.bitbucket.server.ApplicationPropertiesService;
import com.atlassian.bitbucket.setting.*;


import java.util.Collection;
import java.util.stream.Stream;

public class StashScanner implements PreRepositoryHook<RepositoryHookRequest>
{


    private ApplicationPropertiesService properties;

//    public StashScanner(ApplicationPropertiesService properties)
//    {
//        this.properties = properties;
//    }


    @Override
    public RepositoryHookResult preUpdate(PreRepositoryHookContext context, RepositoryHookRequest request) {
        Repository repo = request.getRepository();
        Settings settings = context.getSettings();

        return RepositoryHookResult.rejected("test","test") ;
    }

}

When I'm enabling the constructor I'm not able to see the hook on the local server. 

Any help will be appreciated.