Description Richard Xu 2005-11-09 17:55:14 EST

I use ant to sign a jar file (JarSigner). Classes in this jar need to be checked
with signers' info after loaded for security purpose. 

However, the Class.getSigners() always returns null in plugin runtime env where
the classLoader is EclipseClassLoader; while it works fine in a standalone java
application (test Application) with the same jar file--the ClassLoader is
Launcher$AppClassLoader in this case.


try
{
    ClassLoader classLoader = LicenseProviderFactory.class.getClassLoader();
    classLicenseProvider = classLoader.loadClass(
LicenseProviderFactory.licenseProviderClass );
}
catch ( Exception e )
{
    throw new LicenseException ( LicenseProviderFactory.licenseProviderClass + "
not found.", e );
}
// it is always null in plugin env. 
Object signers[] = classLicenseProvider.getSigners();

if ( signers == null )
{
    throw new LicenseException ( LicenseProviderFactory.licenseProviderClass + "
has not been signed properly." );
}
else
{
    //verify signature
}