1. Debian



Check java version if exist

java -version


apt-get update
apt-get install default-jdk

Check if Java has been properly installed

java -version

Java Webstart

javaws application.jnlp

JAR Signing

Generating keys

keytool -genkey -alias alias-name -keystore keystore-name

The JKS keystore uses a proprietary format. It is recommended to migrate to PKCS12 which is an industry standard format using

keytool -importkeystore -srckeystore retailpos -destkeystore retailpos -deststoretype pkcs12

Using Jarsigner

jarsigner -keystore keystore-name -storepass keystore-password -keypass key-password jar-file alias-name

Verifying Signed Jar

jarsigner -verify retailpos-1.0-SNAPSHOT.jar

How to create a .JAR file?

Java Archive (JAR) files allow developers to package many classes into a single file. JAR files also use compression, so this can make applets and applications smaller.

Creating a .JAR file is easy. Simple go to the directory your classes are stored in and type :-

jar -cf myfile.jar *.class

If your application or applet uses packages, then you’ll need to do things a little differently. Suppose your classes were in the package - you’d change to the directory above mycode and type the following :- (Remember to use / on UNIX systems)

jar -cf myfile.jar .\mycode\games\CoolGame\*.class

Now, if you have an existing JAR file, and want to extract it, you’d type the following

jar -xf myfile.jar

Working with JAR files isn’t that difficult, especially if you’ve used the unix ‘tar’ command before. If you’re planning on packaging an applet for Internet Explorer, or an application for Microsoft’s jview, you might also want to consider .CAB files.

native2ascii - Native-to-ASCII Converter

Converts a file with native-encoded characters (characters which are non-Latin 1 and non-Unicode) to one with Unicode-encoded characters.