As Jetty 6 failed to use the port inherited from xinetd, I have to use Jetty 7. Unfortunately Jetty is missing the JSP support by default. Here is how to enable it:
There are several differences between Jetty 6 and Jetty 7:
More information is at the Porting to Jetty 7 page.
Jetty includes a gzip-filter for dynamic compression of contents, thus saving bandwidth and enabling your site to load faster (especially important if you have a lot of javascript).
To configure it, add the follwing filter definition to your web.xml:
<filter>
<filter-name>GzipFilter</filter-name>
<filter-class>org.eclipse.jetty.servlets.GzipFilter</filter-class>
<init-param>
<param-name>mimeTypes</param-name>
<param-value>text/html,text/plain,text/xml,application/xhtml+xml,text/css,application/javascript,image/svg+xml</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>GzipFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
Please note: This configuration is for Jetty 7. For Jetty 6 change the filter to org.mortbay.servlet.GzipFilter.
Jetty comes with a very nice Password encrypting command. Unfortunately, there is no passwd.sh to call it, and you have to manually find out where it is defined. Also, the documentation is for Jetty 6 only, and the names of the classes and libraries have changed in Jetty 7.
Here is the missing passwd.sh for Jetty 7:
#!/bin/bash
# look for JETTY_HOME
if [ -z "$JETTY_HOME" ]
then
cd $(dirname "$0")
JETTY_HOME_1=$(pwd)
cd - > /dev/null
JETTY_HOME_1=$(dirname "$JETTY_HOME_1")
JETTY_HOME=${JETTY_HOME_1}
fi
java -cp $JETTY_HOME/lib/jetty-http-7.0.1.v20091125.jar:\
$JETTY_HOME/lib/jetty-util-7.0.1.v20091125.jar \
org.eclipse.jetty.http.security.Password $*
Please note that the JETTY_HOME detection is also changed from the original jetty shell scripts to be more sane.
Useful command for handling PNG files.
Prerequisites: ImageMagick, Pngcrush
Resize to a given maximum size
for i in *png ; do convert $i -geometry 16x16 x/$i; done
Resize exactly to given size, adding transparent borders
for f in $(for i in x/* ; do file $i | grep -v '16 x 16' | cut -d: -f1; done) ; do convert $f -type TrueColorMatte -compose Src -gravity center -extent 16x16 y/$f ; done
Trying different PNG compression settings, removing extra PNG contents (such as comments)
for i in y/*png ; do pngcrush -rem alla -reduce -brute "$i" z/"$i"; done
Most chosen actual reason:
Technical Reasons
Please note: Most of this is also true for 64 bit Linux.
X-GNOME-Autostart-enabled=true
I commonly need to convert between PEM and p12
You need both the key and the certificate:
openssl pkcs12 -export -in usercert.pem -inkey userkey.pem -out bundle.p12
openssl pkcs12 -in bundle.p12 -out userkey.pem -nodes -clcerts
The resulting file contains both the key and certificate. Use a text editor to split into two files again.
The singleton pattern ensures that there is exactly one instance of a class.
There are multiple ways to implement the Singleton Pattern in Java, here is my personal favorite:
public final class SomeClass {
private static final class SingletonHolder {
private static final SomeClass INSTANCE = new SomeClass();
private SingletonHolder() {}
}
private SomeClass() {
// Add code if needed
}
/**
* @return the Singleton Instance.
*/
public static SomeClass getInstance() {
return SomeClass.SingletonHolder.INSTANCE;
}
// add other methods
}Notes:
Here is how to determine the mime-type for a given file on the command line.
file --mime '''filename''
xdg-mime query filetype '''filename''' gvfs-info -a standard::content-type '''filename''' | grep content | cut -d: -f4 | cut -d\ -f2- gnomevfs-info '''filename''' | grep MIME | cut -d\: -f2- | cut -d\ -f2- file --mime '''filename''' | cut -d\: -f2- | cut -d\ -f2
Update: We can modify the conditional alias to support mime types as well:
conditional_alias2 () {
UNSET=false
alias $1 > /dev/null 2>&1 || UNSET=true
[ $UNSET = true ] && which $2 > /dev/null 2>&1 && alias $1=$3
}
mime_gvfs() {
gvfs-info -a standard::content-type $1 | grep content | cut -d: -f4 | cut -d\ -f2-
}
mime_xdg() {
xdg-mime query filetype $1
}
mime_gnomevfs() {
gnomevfs-info file://$PWD/$1 | grep MIME | cut -d\: -f2- | cut -d\ -f2-
}
conditional_alias2 mime gvfs-info mime_gvfs
conditional_alias2 mime xdg-mime mime_xdg
conditional_alias2 mime gnomevfs-info mime_gnomevfs
Finally found out how to connect to an SSL server over the command line:
openssl s_client -connect www.example.com:443
What a great netcat replacement!
On OS X I can just "open" any file. On Windows, I can use "start". And on Linux? On modern installations, the "xdg-open" command works just fine. Unfortunately - this is not always the case. And I don't want to remember different commands for different machines. So here is the ultimate open alias setting for bash, for all systems that I use (it can be easily extended for other environments).
conditional_alias() {
UNSET=false
alias $1 > /dev/null 2>&1 || UNSET=true
[ x$UNSET = xtrue ] && which $2 > /dev/null 2>&1 && alias $1=$2
}
conditional_alias open gvfs-open
conditional_alias open xdg-open
conditional_alias open gnome-open
conditional_alias open exo-open
uname | grep MINGW > /dev/null 2>&1 && alias open=start