Never been to CodeSnippets before?

Snippets is a public source code repository. Easily build up your personal collection of code snippets, categorize them with tags / keywords, and share them with the world (or not, you can keep them private!)

20 total

On This Page:

  1. 1 java :: create unique ID
  2. 2 Ubuntu and writing Java servlets
  3. 3 Change package names of java files
  4. 4 Export french characters
  5. 5 Java Program + DWM/WMII/Awesome/... = Grey Rectangle
  1. 6 Tomcat connector for lighttpd:
  2. 7 Make your JSP an XHTML
  3. 8 How to use JSTL fmt:message and resource bundle
  4. 9 Ver los componentes de una clase
  5. 10 Find Out what columns are in your result set

java :: create unique ID

to java id unique by vindigo on Sep 19, 2008
// create unique ID

import java.util.UUID;

public class createID
{

   /**
    * create unique ID
    */
   public static void main(String[] args)
   {
    //generate random UUIDs
      UUID idOne = UUID.randomUUID();
      log("UUID One: " + idOne);
   }
   
   public static void log(Object aObject)
   {
      System.out.println( String.valueOf(aObject) );
   }
}

Ubuntu and writing Java servlets

to server java web jsp jre jdk class sun j2 j2ee jar war system 6 5 classpath path servlet by chrelad on Aug 22, 2008
Kind of a strange, and I'm sure this wouldn't have happened on any other distribution of Linux, but I spent forever looking through blogs, message boards, and all manner of other places looking for an answer to this question.

The problem was with this little itty bitty smidge of code:
/**
 * hello.java
 */
import javax.servlet.*;

class HelloWorld
{
        public static void main(String[] args)
        {
                System.out.println("Hello World!");
        }
}


Everytime I wanted to compile this, I got something like "Could not find javax.servlet. blah blah" So, eventually, I just pulled an apt-cache search j2 (for j2ee) and saw an entry for libservlet2.4-java. Hmmmmm, what the heck is that I wondered. I installed it and went to the Ubuntu site to look at what files were installed and sure enough:

/usr/share/java/jsp-api-2.0.jar
/usr/share/java/jsp-api.jar
/usr/share/java/servlet-api-2.4.jar
/usr/share/java/servlet-api.jar


Perfect! I added these paths to my CLASSPATH variable in my .bashrc and whamo, I'm in business and flaunting my little HelloWorld.class file all around town.

I hope this helps someone else!

Change package names of java files

to shell java by ducleotide on Aug 15, 2008
changes the package names of java classes.

For example, if you have a bunch of java files in a package and you need to move them to a new package.

#!/bin/sh
                          
for file in `ls *.java` 
do
  sed -e "s/old.package.name/new.package.name/" $file > /tmp/tempfile.tmp
  mv /tmp/tempfile.tmp $file
done

Export french characters

to export java jvm options ASCII UTF-8 french characters accents by interpretes on Jun 21, 2008
// description of your code here

java -Dfile.encoding=CP850 YourClassName
export JAVA_OPTS=-Dfile.encoding=UTF-8

Java Program + DWM/WMII/Awesome/... = Grey Rectangle

to java window bug grey gray square rectangle blank empty jre jdk dwm wmii awesome wm manager by chrelad on May 29, 2008
To get past the problem of java programs showing up as grey squares on your screen when you are using a non-standard window manager, simply prefix the program name or "java -jar ..." with "AWT_TOOLKIT=MToolkit"

AWT_TOOLKIT=MToolkit webscarab

Tomcat connector for lighttpd:

to lighttpd java tomcat by mork554 on Feb 25, 2008
To connect Tomcat to lighttpd use the following code:



server.modules  += ( "mod_proxy_backend_ajp13" )
$HTTP["url"] =~ "^/tomcat/" {
  proxy-core.balancer = "round-robin"
  proxy-core.protocol = "ajp13"
  proxy-core.backends = ( "localhost:8009" )
  proxy-core.max-pool-size = 16
}

Make your JSP an XHTML

to xhtml java jsp xforms by kemo on Aug 02, 2007
By default, a JSP file won't be considered as an XHTML stream by the web browser. This will make things such as XForms not being rendered since the browser XForms plugins/addons render Xforms only for XHTML pages. To make a JSP file as XHTML, put this at the beginning of the JSP file

<?xml version="1.0" encoding="utf-8"?>
<% response.setContentType("application/xhtml+xml"); %>


Note that the XML declaration has to be in the first line for a valid XHTML. Of course, after doing this, you need to make all your tags valid XML in your JSP as well.

How to use JSTL fmt:message and resource bundle

to java tomcat jstl jsp by kemo on Aug 02, 2007 2 Comments
To use JSTL fmt:message tags with a message bundle, there are two ways.

First, if there is only one properties file, use, the following code in web.xml file. 

  <context-param>
    <param-name>javax.servlet.jsp.jstl.fmt.localizationContext</param-name>
    <param-value>class.path.to.your.resources.bundle</param-value>
  </context-param>


Use <fmt:message key="your.message.key"/> in the JSP.

Second, if there are multiple properties files, and there are different locales, use
<fmt:setBundle basename="class.path.to.your.resources.bundle"/>

before <fmt:message key="your.message.key"/>

Or you can write

<fmt:bundle basename="class.path.to.your.resource.bundle">
  <fmt:message key="your.message.key"/>
</fmt:bundle>

Ver los componentes de una clase

to java jython by KingSizePrawn on Jul 27, 2007
Para ver los componentes de una clase

Class.getDeclaredFields(class)
Class.getDeclaredConstructors(class)
Class.getDeclaredMethods(class)

Find Out what columns are in your result set

to java jdbc by dcdan on Jun 21, 2007
// assumes your RecordSet is named rs

		ResultSetMetaData md = rs.getMetaData();
		Logger.debug("Col count is " + md.getColumnCount());
		for(int i=1; i < (md.getColumnCount() +1) ; i++) {
			Logger.debug("Column name is " + i +" "+ md.getColumnName(i));
		}
20 total

On This Page:

  1. 1 java :: create unique ID
  2. 2 Ubuntu and writing Java servlets
  3. 3 Change package names of java files
  4. 4 Export french characters
  5. 5 Java Program + DWM/WMII/Awesome/... = Grey Rectangle
  1. 6 Tomcat connector for lighttpd:
  2. 7 Make your JSP an XHTML
  3. 8 How to use JSTL fmt:message and resource bundle
  4. 9 Ver los componentes de una clase
  5. 10 Find Out what columns are in your result set