Java Development

[redmapleleaf]

Hi all,

I need your help to get started. I have downloaded Eclipse with Blackberry plugins. So far I am able to compile and run all the sample examples for the Blackberry. However when I started doing my own application using java.util.Map package, I got the unresolved message 'the import java.util.Map cannot be resolved'.

Do you know what have I done wrong?

Thank you for your help.

[RexDoug]

java.util.Map does not exist on the MicroEdition platform.

See the Maps sample that comes with the JDE for an example of using maps on the RIM platform.

[redmapleleaf]

Hi RexDoug,

I wonder if we are we talking about the same thing? I was not refering to Maps and Location service. 

I have a number of unresolved imports in my code like

import java.util.Map;

import java.util.regex.*;

import java.io.File;

import java.io.FileInputStream;
import java.io.FileOutputStream;

import java.io.BufferedReader;

import java.util.zip.GZIPInputStream;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.InetAddress;

All of them have unresolved import problem so I thought I must be missing some library configuration. If these package are not available on the blackberry then would you be able to point me to some similar packages that I could use?

Thanks!

[RexDoug]

You are importing from Java SE, not Java ME. None of these exist on the Micro Edition platform.

Are you trying to write for the BlackBerry, or for a desktop?

Again, see the samples that come with the various BlackBerry JDE distributions.

My guess is that you have configured your project as a "standalone desktop" rather than as a "BlackBerry" project.

[dognose]

Simple Take a look at the Blackberry Api Reference, and you see, that java.net.* is not an included api

http://www.blackberry.com/developers/docs/4.7.0api/

example:

instead of using "import java.util.Map;"

try "import net.rim.blackberry.api.maps" (dont know if this is the same...)

and so on.

you should always have a look at the Blackberry Api Refrence, not only on the Sun's one (cause not all apis

are included)

dognose

Message Edited by dognose on 11-30-2008 12:56 PM

[redmapleleaf]

OK, I am trying to port an application from a PC and I guess that is the beginning of my problem. Isn't there a way to get around this problem? I am hoping not to have rewriting a lot of code, please tell me if I am wrong.

I am using the Blackberry project, not standalone desktop.

[dognose]

i dont know, if theres a automatic solution,

but i think you have to do the following:

replace the importet apis with the one you should refer in the Blackberry Enviroment.

find errors, where the Api didn't serve the requestet method / Object

then import the right one, or - if theres no one - take other code ^^

f.e. you use the java.io.file api. The object file in BB is reserved for signed aps,

so you have to úse the Fileconnector class, which will result in a bunch of new code... (or sign your

application)

regards,

dognose

[RexDoug]

OK, that explains the problem.

There is no magic when porting from SE to ME. The API support is similar but there are many things that are missing and/or different, especially with regards to networking and the UI library.

I would pull the existing classes over one at a time, researching the API support for each class and changing as needed.

[damien-jkr]

---

redmapleleaf wrote:

Hi RexDoug,

I wonder if we are we talking about the same thing? I was not refering to Maps and Location service. 

I have a number of unresolved imports in my code like

import java.util.Map;

import java.util.regex.*;

import java.io.File;

import java.io.FileInputStream;
import java.io.FileOutputStream;

import java.io.BufferedReader;

import java.util.zip.GZIPInputStream;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.InetAddress;

All of them have unresolved import problem so I thought I must be missing some library configuration. If these package are not available on the blackberry then would you be able to point me to some similar packages that I could use?

Thanks!

---

I've a problem with default library BlackBerry JRE, java.net not exist, java.io.BufferedReader to.

??

[rcmaniac25]

---

damien-jkr wrote:

I've a problem with default library BlackBerry JRE, java.net not exist, java.io.BufferedReader to.

??

---

As RexDoug has stated, this is Java ME not Java SE.

There are many resources for learning how to make a network connection (one of the best is the post at the top of the Java Development forum). There may be a lot but go through it slowly and you will find everything you need to know about network connections.