The catch?
XML does not support named entities by default, you have to declare it before hand. Only < > & " and ' are predefined.

Something like:

1
2
3

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE xsl:stylesheet [ <!ENTITY nbsp "&#160;"> ]>
<xsl:stylesheet xmlns="http://www.w3.org/1999/XSL/Transform" version="1.0">

Got this from here…

The fix…
Instead of using named entities in the XML (I think this also affects JSON, I could be wrong since I didn’t test this is JSON) like ñ, use character references to support special character encoding.

Example:
white space =   =  
ñ = ñ = ñ

they are all the same… #160 is referenced/mapped to ” ” and #241 is referenced/mapped to ñ

So when forming your XML before returning it through an AJAX call, form the special characters via character reference.

Hope this helps you out there having this problem.

So anyone having this problem, check the following…

• What OS are you running? Vista/Win7?
• What IDE are you using?
• Was your IDE elevated to admin status?

So, check your OS, I’m using Win7. I was developing this under WinXP a few months back, and now under Win7, the folder is protected since it was under the “Program Files (x86)” folder group. (Argh!)
I closed my IDE, using IDEA IntelliJ 9.0, ran the IDE under “Administrator Level” and the problem disappeared!

So check those out first.

I was following the tutorial from Sun in creating my first JNI and calling my compiled C++ library, I was stuck in the last part where this error popped out whenever I tried to invoke

java HelloWorld

the error was…

java.lang.UnsatisfiedLinkError: no HelloWorld in java.library.path
          at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1709)
          at java.lang.Runtime.loadLibrary0(Runtime.java:823)
          at java.lang.System.loadLibrary(System.java:1030)
          at HelloWorld.<clinit>(HelloWorld.java:<line number>)
Could not find the main class: HelloWorld. Program will exit.

one way of fixing this is to include the current location of your newly compiled shared library (ex. HelloWorld.so). I’m using Ubuntu linux,so to include the current folder where your “.so” file is located, invoke…

LD_LIBRARY_PATH=`pwd`
export LD_LIBRARY_PATH

or you can also do …

LD_LIBRARY_PATH=.
export LD_LIBRARY_PATH

another way is to define the location when running the program…

java -Djava.library.path=. HelloWorld

this will instruct java to locate the native library in the current location. Now call your program again and this time it work execute your native program.

It’s possible that when you execute your program after doing the above steps, another error will come out. This happened to me and the culprit was when I compiled the cpp file. The error would look something like…

java.lang.UnsatisfiedLinkError: <library location>: <library location>: only ET_DYN and ET_EXEC can be loaded
        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
        at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1778)
        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1674)
        at java.lang.Runtime.load0(Runtime.java:770)
        at java.lang.System.load(System.java:1005)
        at HelloWorld.<clinit>(HelloWorld.java:16)

to fix this, include the “-shared” option when compiling the cpp file.

g++ -shared HelloWorld.cpp -o HelloWorld.so -I /path/to/your/java/include/folder/where/jni.h/is/located -I /path/to/your/java/include/linux/folder/

Do not include the “-c” option, this will skip the linking stage.

1. Login as root, you can also use “su” though I prefer to login as root.
2. apt-get install sun-java5-jdk
• This will install Java 2 SDK (1.5), ubuntu will start downloading packages that are not found in your system.
3. apt-get install tomcat5.5 tomcat5.5-admin tomcat5.5-webapps
• Of course jakarta-tomcat 5.5, I’m using 5.5 since this supports java 1.5
4. Now here’s the tricky part, location for Java and jakarta-tomcat
• Java’s location is in /usr/lib/jvm/java-1.5.0-sun
• Jakarta-Tomcat’s location is in /usr/share/tomcat5.5
• We will need these location for the export configurations to be written in the .bashrc
5. Now, open .bashrc in your favorite text editor, I used vim
6. At the end of the file add these:
   
export JAVA_HOME=/usr/lib/jvm/java-1.5.0-sun
export CLASSPATH="/usr/share/tomcat5.5/common/lib/jsp-api.jar;/usr/share/tomcat5.5/common/lib/servlet-api.jar"
export CATALINA_HOME=/usr/share/tomcat5.5

7. Now save the file and exit, then log back in. This is required for the export script to be set.
8. Before starting the server, the default port the installer set is 8180 instead of the 8080 port that Tomcat uses. To change this, go to /usr/share/tomcat5.5/conf/ and open the file server.xml. Locate the line:
   
...Connector port="8180" maxHttpHeaderSize="8192"...

   and change 8180 to 8080. Save and exit. Now your ready to test the server.
9. Now try the server if it starts, /usr/share/tomcat5.5/bin/startup.sh You should see something like this:
   
Using CATALINA_BASE: /usr/share/tomcat5.5
Using CATALINA_HOME: /usr/share/tomcat5.5
Using CATALINA_TMPDIR: /usr/share/tomcat5.5/temp
Using JRE_HOME: /usr/lib/jvm/java-1.5.0-sun

10. Shutting down the server is just /usr/share/tomcat5.5/bin/shutdown.sh
11. Now, during installation of tomcat, Ubuntu automatically adds a startup and shutdown script for ubuntu to use as it starts up or shutsdown in /etc/init.d/ folder. Filename is tomcat5.5. As the server finishes starting up, you will notice tomcat isn’t running at all. One possible problem is that the script didn’t use the correct path for the java 2 sdk. You can check the boot log in /var/log/. Check if during boot up, tomcat5.5 encountered problems. For the problem stated above, you can fix this by going to /etc/default/ and edit the tomcat5.5 file. Locate the line:
    
    #JAVA_HOME=/usr/lib/j2sdk1.4-sun

    remove the ‘#’ and change it to…
    
    JAVA_HOME=/usr/lib/jvm/java-1.5.0-sun

    or wherever your java directory is.After that, restart the server and see if tomcat was successfully started.
    
    /etc/init.d/tomcat5.5 status

Edit: Problem encountered:

• Tomcat does not load in Ubuntu 8.04

Found a little problem loading Tomcat 5.5 under Ubuntu 8.04, it either fails or white screen just appears. I don’t know what happened from 6.04 to 8.04 but once I compared the init.d/tomcat5.5 startup script from 6.04 and 8.04, there WERE changes to the scripts. I replaced the new tomcat5.5 script in 8.04 with the old one from 6.04 and the server started properly after a server restart. I don’t know why but this may have something to do with permissions and I have yet to trace the script.

• java.lang.ClassNotFoundException: org.apache.jasper.tagplugins.jstl.If

• The problem here is that the above name is incomplete… what it should have been is org.apache.jasper.tagplugins.jstl.core.*
• Now, to fix the problem, locate /var/lib/tomcat5.5/webapps/jsp-examples/WEB-INF/tagPlugins.xml and open it with your text editor… I used vim. Now edit each line of code that has org.apache.jasper.tagplugins.jstl in it and add “.core” after jstl. What you will see after editing the code will be…

org.apache.taglibs.standard.tag.rt.core.IfTag

org.apache.jasper.tagplugins.jstl.core.If

org.apache.taglibs.standard.tag.common.core.ChooseTag

org.apache.jasper.tagplugins.jstl.core.Choose

org.apache.taglibs.standard.tag.rt.core.WhenTag

org.apache.jasper.tagplugins.jstl.core.When

org.apache.taglibs.standard.tag.common.core.OtherwiseTag

org.apache.jasper.tagplugins.jstl.core.Otherwise

org.apache.taglibs.standard.tag.rt.core.ForEachTag

org.apache.jasper.tagplugins.jstl.core.ForEach

• SEVERE: The scratchDir you specified: [folder_path] is unusable.

• Sidenote: took me 2 days to figure out why this was happening (X_x)
• Based from the Catalina logs, the folders under webapps was not accessible by tomcat5.
• Now looking under all processes running ( ps command ), most bootup services were running under root (mysql, apache, etc ) but tomcat5 was not.
• If I start tomcat5 when I logged into the console as root, the problem disappears. This lead me to believe this might have been the Tomcat5 user was not given the correct privileges.
• Work-around 1: Elevate Tomcat5 user to root access level.
• Work-around 2: Go to /etc/init.d/ and open Tomcat5.5 under any text editor ( I used vim ). Locate the line TOMCAT5_USER=tomcat55 and change it to TOMCAT5_USER=root . Restart your server or you can also execute the restart command for Tomcat5.5 in init.d folder

sources:

• Ubuntu/Drapper Remaster
• linux journal
• Ubuntu Install Tomcat
• Net Admin Tools