Re: Map<String, ?>

[jyeary]

The implication is that you want to use generics. If you use Map() it is expecting Map(Object x, Object y) by default. In your case you are using Map<String ,y>(), you need to tell the compiler what y is. If you use one generic (String), you must tell the compiler what the second element is going to be, even if it is an Object. Try Map<String, Object>().


On Tue, Jun 8, 2010 at 6:29 AM, Jose Alvarez de Lara <address-removed ([email]address-removed[/email])> wrote:

[pepelara]

Thanks for your help John.

You say I try Map<String, Object>, but I can't. In this case Map<String, ?> is a parameter of the initialize() method of the JASS LoginModule.

I am trying to assign a value to this Map for a String key but I do not find the solution. The only explanation I guess is that this parameter is an input parameter and
it is not possible to change it. The reference of LoginModule says this argument is used to pass another LoginModule.

This is taking me a week to do login but I do not find the solution. I am trying a jdbcRealm against GF v3 and MySQL

Any suggestion?

Thanks again,
Jose


From: John Yeary ([email]address-removed[/email])
Sent: Tuesday, June 08, 2010 4:03 PM
To: nbj2ee ([email]address-removed[/email])
Subject: [nbj2ee] Re: Map<String, ?>




The implication is that you want to use generics. If you use Map() it is expecting Map(Object x, Object y) by default. In your case you are using Map<String ,y>(), you need to tell the compiler what y is. If you use one generic (String), you must tell the compiler what the second element is going to be, even if it is an Object. Try Map<String, Object>().


On Tue, Jun 8, 2010 at 6:29 AM, Jose Alvarez de Lara <address-removed ([email]address-removed[/email])> wrote:

[jyeary]

Take a look at this

http://java.sun.com/j2se/1.5/pdf/generics-tutorial.pdf

You may be encountering something like Map<String, ?> map = new HashMap<String, String>(); This creates a map which does not allow you to add elements.

map.add("Hello", "World"); // Compile time error.


On Tue, Jun 8, 2010 at 12:51 PM, Jose Alvarez de Lara <address-removed ([email]address-removed[/email])> wrote:

[pepelara]

Thanks John for your kind help.
You are right.

This map is an input parameter of a method. You can set your private field to this parameter to read it later.
I think that is the reason it is defined this way.

Best Regards,
Jose


From: John Yeary ([email]address-removed[/email])
Sent: Tuesday, June 08, 2010 9:47 PM
To: nbj2ee ([email]address-removed[/email])
Subject: [nbj2ee] Re: Map<String, ?>




Take a look at this

http://java.sun.com/j2se/1.5/pdf/generics-tutorial.pdf

You may be encountering something like Map<String, ?> map = new HashMap<String, String>(); This creates a map which does not allow you to add elements.

map.add("Hello", "World"); // Compile time error.


On Tue, Jun 8, 2010 at 12:51 PM, Jose Alvarez de Lara <address-removed ([email]address-removed[/email])> wrote: