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Java WebStart
is a process of deploying Java applications over the Internet. WebStart
applications are acompanied by some specific files including a JNLP
file. A core part of the JNLP file is the codebase tag. This tag
must point to the server on which your application resides (such
as: codebase="http://www.webrenderer.com/webstart/").
Core
Requirements
When deploying WebRenderer through WebStart
we have had success by doing the following:
1 - All JARs
must be signed with the same key file.
Key file generation:
keytool
-genkey -keystore WRKeystore -alias wrstore
File wrstore generated, then
Jars signing:
jarsigner
-keystore WRKeystore <jarname> wrstore
e.g
to sign webrenderer.jar
jarsigner
-keystore WRKeystore webrenderer.jar wrstore
3.
Write the JNLP file
Heres an example of codebase in
a JNLP file (please note the Security section):
<jnlp
spec="1.0+"
codebase="{set here base URL where all jars stored for
example http://www.webrenderer.com/webstart/}"
href="{Your
application name}.jnlp">
<security>
<all-permissions/>
</security>
<resources>
<j2se
version="1.4"/>
<jar
href="{Your application jar}"/>
<jar
href="webrendererse.jar"/>
</resources>
Picking
the platform in JNLP
<resources
os="Windows">
<jar href="webrendererse-win.jar"/>
<jar
href="corecomponentsse-win.jar"/>
</resources>
<resources
os="Linux">
<jar href="webrendererse-linux.jar"/>
<jar
href="corecomponentsse-linux.jar"/>
</resources>
<resources
os="Mac OS X">
<jar href="webrendererse-osx.jar"/>
<jar
href="corecomponentsse-osx.jar"/>
</resources>
<resources
os="Sun">
<jar href="webrendererse-solaris.jar"/>
<jar
href="corecomponentsse-solaris.jar"/>
</resources>
Using
this method to deploy will ensure the correct files are downloaded
to the client WebStart based on the platform you are running, amounting
to an efficient cross-platform distribution.
Closing WebRenderer
when your application terminates
You must call System.exit(0);
when you close your Java WebStart application, to destroy the WebRenderer
instance. If you do not call System.exit(0) your application will
still be running without a Window and if you try to run your application
again, you will receive a java.io.FileNotFoundException, which will
point to WebRenderer.
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