Strange... Why is the system attempting to run a JNLP file if you have the program on disk? What is this JNLP file? Where is it located, what does it has inside?

Really don't know... Cause I even don't know what's a JNLP file !

Processing is still in the same folder (Documents) and I tried to start it in the same way. For now Processing is the only soft with problems after my upgrade.

I suspected java but uninstall/reinstall didn't resolve my problem.

I tried different ways to reinstall java, just like a Linux newbie (copy/paste terminal instructions found in some forums).

Error's window is different (3 tabs) but the problem is still present. Here are details...

1st left tab (Launched file) :

#!/bin/sh

# This script runs Processing, using the JDK in the Processing
# installation directory if possible.

# If no JDK was installed with Processing then the script tries to use
# the preferred Java version of the machine, i.e. what is executed
# by the "java" console command. This must be a Sun JDK (for details, see
# http://processing.org/reference/environment/platforms.html#java).

# In order to run Processing with an already installed JDK that is *not*
# the preferred Java version of the machine, create a symlink named "java"
# in the Processing installation directory that points to the JDK home
# directory.

# Thanks to Ferdinand Kasper for this build script. [fry]


# JARs required from JDK (anywhere in/below the JDK home directory)
JDKLIBS="rt.jar"

# Set this to non-zero for logging
LOGGING=0

# Logs name and value of a variable to stdout if LOGGING is non-zero.
# Expects the variable name as parameter $1.
log() {
  if [ $LOGGING -ne 0 ]; then
    eval echo $1=\$$1
  fi
}


# Locates JDKLIBS in a directory and its subdirectories and saves their
# absolute paths as list to JDKCP. Expects the directory as parameter $1.
# Sets SUCCESS to 1 if all libraries were found, to 0 otherwise.
make_jdkcp() {
  # Back out of JRE directory if apparently located inside a JDK
  if [ -f "$1/../bin/java" ]; then
    DIR="$1/.."
  else
    DIR="$1"
  fi
  log DIR

  JDKCP=
  SUCCESS=1

  # Locate JDKLIBS
  for L in $JDKLIBS; do
    # Locate only the first library with a matching name
    LIB=`find "$DIR" -name $L 2>/dev/null | head -n 1`
    log L
    log LIB

    # Library found?
    if [ -n "$LIB" ]; then
      JDKCP="$JDKCP"${JDKCP:+:}"$LIB"
    else
      SUCCESS=0
    fi
  done

  log JDKCP
}


# Get absolute path of directory where this script is located
APPDIR=`readlink -f "$0"`
APPDIR=`dirname "$APPDIR"`
log APPDIR

# Try using a local JDK from the same directory as this script
JDKDIR=`readlink -f "$APPDIR/java"`
make_jdkcp "$JDKDIR"
log SUCCESS

# Local JDK found?
if [ $SUCCESS -ne 1 ]; then
  # No, try using the preferred system JRE/JDK (if any)
  JDKDIR=`which java` && JDKDIR=`readlink -e "$JDKDIR"` && JDKDIR=`dirname "$JDKDIR"`/..
  make_jdkcp "$JDKDIR"
  log SUCCESS
fi

# Add all required JARs to CLASSPATH
CLASSPATH="$CLASSPATH"${CLASSPATH:+:}"$JDKCP"
for LIB in "$APPDIR"/lib/*.jar; do
  CLASSPATH="$CLASSPATH"${CLASSPATH:+:}"$LIB"
done
for LIB in "$APPDIR"/core/library/*.jar; do
  CLASSPATH="$CLASSPATH"${CLASSPATH:+:}"$LIB"
done
export CLASSPATH
log CLASSPATH

# Make all JDK binaries available in PATH
export PATH="$JDKDIR/bin":"$PATH"
log PATH

current_name=`basename $0`
cmd_name='processing-java'

if [ $current_name = $cmd_name ]
then
    java processing.mode.java.Commander "$@"
    exit $?
else
  # Start Processing in the same directory as this script
  if [ "$1" ]; then
    SKETCH=`readlink -f $1`
  else
    SKETCH=
  fi
  cd "$APPDIR"

  java processing.app.Base "$SKETCH" &
fi


2nd tab (Exception) :

JNLParseException[ Impossible d'analyser le fichier de lancement. Erreur à la ligne 0.]
    at com.sun.javaws.jnl.XMLFormat.parse(Unknown Source)
    at com.sun.javaws.jnl.XMLFormat.parse(Unknown Source)
    at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
    at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
    at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
    at com.sun.javaws.Main.launchApp(Unknown Source)
    at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
    at com.sun.javaws.Main.access$000(Unknown Source)
    at com.sun.javaws.Main$1.run(Unknown Source)
    at java.lang.Thread.run(Thread.java:724)


3rd tab (Capsuled exception):

Failed to find the '<' charater that marks the end of a CDATA element. Exception parsing xml at line 0
    at com.sun.deploy.xml.XMLParser.skipPCData(Unknown Source)
    at com.sun.deploy.xml.XMLParser.nextToken(Unknown Source)
    at com.sun.deploy.xml.XMLParser.parse(Unknown Source)
    at com.sun.javaws.jnl.XMLFormat.parse(Unknown Source)
    at com.sun.javaws.jnl.XMLFormat.parse(Unknown Source)
    at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
    at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
    at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
    at com.sun.javaws.Main.launchApp(Unknown Source)
    at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
    at com.sun.javaws.Main.access$000(Unknown Source)
    at com.sun.javaws.Main$1.run(Unknown Source)
    at java.lang.Thread.run(Thread.java:724)


Does it mean something for someone ?

Thanks for your help.

Take a look @ this very recent post:
http://forum.processing.org/topic/java-issues-seem-insurmountable

Myself, I prefer to use already installed OpenJDK rather than go in the trouble to install Oracle's one. 

Thank you for your help.

I saw this post today and hoped a moment this will save me.

Then, I tried to completly remove java like that :
http://askubuntu.com/questions/84483/how-to-completely-uninstall-java

Then reinstall with :
http://www.webupd8.org/2012/01/install-oracle-java-jdk-7-in-ubuntu-via.html

Unfortunately, Processing still doesn't work.
But this web page is well displayed : http://www.java.com/fr/download/testjava.jsp

So... java works in firefox... but doesn't works for Processing.

Some idea ?

My idea is following the rest of my advise there:
Let Processing use the system's Java in place of its bundled 1.
Rename the subfolder /java inside processing folder to something else.
That's what I do in my Lubuntu. Although it's a 64-bit OpenJDK; not Oracle's.

None java at start up.
Just reinstalled openjdk-7-jre and icedtea-7-plugin. The only one on my 32bits OS now.
Tested (OK) on http://www.java.com/fr/download/testjava.jsp
Renamed java subfolder in Processing folder.

But...
Back to the first error ! (Fatal: Read Error: Could not read or parse the JNLP file.)

3 days I'm working on my old W7 laptop.

The only thing I can think of is that maybe the CLASSPATH is wrong.
Apparently in my system, CLASSPATH is empty.
I dunno much about it. If you wish, take a look at this old article:
http://www.linuxquestions.org/questions/showthread.php?postid=898715#post898715

Sorry, I'm not sure to understand. In fact, I'm pretty sure that technical content of this article is too tough for me.

How can I check my CLASSPATH ? (I tried to find un .bashrc file without succes)

And how do you propose me to modify it ?

I precise that java is well launched when I try to start Processing (Open with... Icetea java web start). Error happens few seconds after (before Processing's window appears).

Thanks again for your help.