Code signing of java applets – using Ant

To sign your java assets during the Ant build process, you can add the following to the build.xml to make use of the values we established in the keystore creation step.

Something as simple as the following could be used:

<signjar jar="example.jar" alias="selfsigned" keystore="" keypass="123456" storepass="123456"/>

I generally prefer to add the following:

In – I externalize the variables…


Then, in build.xml – a ‘task’ for signing…

<property file=""></property>
... snip ...
<target name="signwar" depends="war">
<echo message="--- signing ---" />
<signjar jar="${build.dir}/${}.war" alias="${signing.alias}" keystore="${signing.keystore}" keypass="${signing.keypass}" storepass="${signing.storepass}" />


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