Log Filter not working !

I wanted to make a plugin that deletes things like "Player issued server command: /kill Player" so I used java. util. logging.Filter like such :

Code:

package me.kavin.betterchat;
import java.util.logging.Filter;
import java.util.logging.LogRecord;

public class FilterX implements Filter
{
@Override
public boolean isLoggable(LogRecord record)
{
if(record.getMessage().contains("Catz7"))
{
return false;
}
else
{
return true;
}
}
}

And also in my OnEnable() added :

Code:

FilterX filter = new FilterX();
Betterchat.getInstance().getServer().getLogger().setFilter(filter);

Am I doing smth wrong because the Filter is not working and console still displays :

 

@Override
public void onEnable()
{
getServer().getPluginManager().registerEvents(new EntityListener(), this);
FilterX filter = new FilterX();
Betterchat.getInstance().getServer().getLogger().setFilter(filter);
}

Here