Apr 22 2010

Shared/Global JNDI Environment Variables

I encountered a situation where I needed some simple Strings accessible to all my applications in glassfish. If you need environment variables in a single web app, it’s as easy as editing web.xml. However I’ve separated my application into several web and ejb modules for manageability concerns, thus I needed to set variables in the application server. I decided to create a Factory that returns a Hashtable of properties one can set in the application server. For this I run on Glassfish 2.1.1; I have not tested it with any other container though I do not see why it wouldn’t work.

Required Files

First the files. You’ll need the following jar. Save it in your application server’s lib directory. On my machine that is C:\sun\appserver\lib.

JNDIObjectFactory.jar

There are two classes in this jar:

com.ebleenterprises.naming.HashtableFactory
com.ebleenterprises.naming.StringFactory

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2 comments   |  tags: , , | posted in Software

Feb 11 2010

Simple JQuery Table Row Filter

Here is a quick piece of JQuery JavaScript code I had to write today to filter the rows shown in a table. Search terms are seperated by a space. The code should be self explanatory. Comments welcome.

Click here to see the code below in action.

<html>
<head>
<script src="jquery-1.4.1.min.js"></script>
<script>
 $(document).ready(function() {
      $("#searchInput").keyup(function(){
 //hide all the rows
          $("#fbody").find("tr").hide();
 //split the current value of searchInput
          var data = this.value.split(" ");
 //create a jquery object of the rows
          var jo = $("#fbody").find("tr");
 //Recursively filter the jquery object to get results. 
          $.each(data, function(i, v){
              jo = jo.filter("*:contains('"+v+"')");
          });
 //show the rows that match.
          jo.show();
 //Removes the placeholder text 
      }).focus(function(){
          this.value="";
          $(this).css({"color":"black"});
          $(this).unbind('focus');
      }).css({"color":"#C0C0C0"});
  });
</script>
</head>
<body>
 <input id="searchInput" value="Type To Filter"><br/>
 <table>
  <thead>
    <tr><th>Column1</th><th>Column2</th></tr>
  </thead>
  <tbody id="fbody">
    <tr><td>cat</td><td>one</td></tr>
    <tr><td>dog</td><td>two</td></tr>
    <tr><td>cat</td><td>three</td></tr>
    <tr><td>moose</td><td>four</td></tr>
    <tr><td>mouse</td><td>five</td></tr>
    <tr><td>dog</td><td>six</td></tr>
  </tbody>
 </table>
</body>
</html>

UPDATE:

To make this be insensitive to case, you need to modify it slightly.
The following code creates a custom jquery selector for case-insensitive matching:

$.expr[':'].containsIgnoreCase = function(e,i,m){
    return jQuery(e).text().toUpperCase().indexOf(m[3].toUpperCase())>=0;
};

The complete code would then be:

<html>
<head>
<script src="jquery-1.4.1.min.js"></script>
<script>
 $(document).ready(function() {
 //Declare the custom selector 'containsIgnoreCase'.
      $.expr[':'].containsIgnoreCase = function(n,i,m){
          return jQuery(n).text().toUpperCase().indexOf(m[3].toUpperCase())>=0;
      };
  
      $("#searchInput").keyup(function(){

          $("#fbody").find("tr").hide();
          var data = this.value.split(" ");
          var jo = $("#fbody").find("tr");
          $.each(data, function(i, v){

               //Use the new containsIgnoreCase function instead
               jo = jo.filter("*:containsIgnoreCase('"+v+"')");
          });

          jo.show();

      }).focus(function(){
          this.value="";
          $(this).css({"color":"black"});
          $(this).unbind('focus');
      }).css({"color":"#C0C0C0"});
  });
</script>
</head>
<body>
<input value="Type To Filter"><br/>
<table>
  <thead>
    <tr><th>Column1</th><th>Column2</th></tr>
  </thead>
  <tbody>
    <tr><td>cat</td><td>one</td></tr>
    <tr><td>dog</td><td>two</td></tr>
    <tr><td>cat</td><td>three</td></tr>
    <tr><td>moose</td><td>four</td></tr>
    <tr><td>mouse</td><td>five</td></tr>
    <tr><td>dog</td><td>six</td></tr>
  </tbody>
</table>
</body>
</html>

7 comments   |  tags: , | posted in Software

Nov 10 2009

Uploading Files Using Flash and Java

The sample code attached below is a complete example for uploading multiple files using flash cs3 and java. After much searching I could not find a complete Flash File uploading tutorial that utilized java; most if not all are for php. This flash interface provides progress for each file independently, and upon completion can notify a javascript function. The files are sent to a simple JAVA servlet where they are saved to the local file system.

For the java servlet there are two library requirements:
commons-fileupload-1.2.1.jar
commons-io-1.3.2.jar

They are included in the web/WEB-INF/lib folder. The source files are saved as a Netbeans 6.7 project with Glassfish set as the target server. It is simple to open the project and change the target server. Both the compiled flash and source file are in the web folder.

I extracted two settings to variables listed in the index.html file so that this could be used without recompiling/editing the flash file. The first variable url is the address of the java servlet to send the files to. The second variable is f  and is the name of the javascript function to call when each file is uploaded. f is optional. These variables need to be set 3 times in the index.html file. See the file for further documentation.

I expect to update the source code slightly over the next couple weeks. I will replace the zip file with the latest as updates are completed.

source files

1 comment   |  tags: , , , , | posted in Software

Aug 26 2009

Glassfish Enterprise v2.1 with HADB Setup on Windows 2003 Cluster

 I am going to go over setting up Glassfish Enterprise v2.1 in a windows clustered high availability environment. For this we will be using two Windows 2003 servers with two network interface cards (NIC) in each server that are network loadbalanced, 2 instances of IIS as the web container and 4 instances of glassfish with HADB behind IIS. You may ask why, and the reason is simply those were the technologies I had to work with; my task was to move from JBOSS to Glassfish. I will attempt to go over this setup in great detail, so as anyone with a basic understanding of these technologies should be able to get this running. For all of the images in the post, click on them for a full size version.

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3 comments   |  tags: , , , , , , , | posted in Software

Aug 13 2009

JAVA Security Provider Error

Just a quick note about a simple but annoying error I encountered when porting an app to glassfish; The code in question was as follows:

 
     ... 
    Charset charset = Charset.forName("UTF-8");
    CharsetEncoder encoder = charset.newEncoder();
    ByteBuffer bbuf = encoder.encode(CharBuffer.wrap(str));
    SecretKeySpec key = new SecretKeySpec( KEY_BASE, "DES" );

    private static Cipher ecipher = Cipher.getInstance( "DES");
    ecipher.init( Cipher.ENCRYPT_MODE, key ); 
    byte[] enc = ecipher.doFinal( bbuf.array() );
     ...
The code above just converts a string (stored as str here) to UTF-8 then encrypts it using DES. Equivalently you could use str.getBytes() for the UTF conversion. The code above worked fine on JBOSS, and worked fine stand alone. It even worked on my glassfish test server, however when deployed on glassfish enterprise I started getting the following stacktrace: Continue reading

7 comments   |  tags: , , , | posted in Software