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This allows the package author to enforce version consistency among packaged classes.
Sealing also provides a security measure to detect code tampering.
Extensions add functionality to the Java platform, and an extensions mechanism is built into the JAR file format.
The Extensions mechanism allows JAR files to specify other required JAR files via the for purposes of the classes in extension1
But by using executable JAR files, we can run an application without extracting it or needing to know the main entry point.
Since every class is signed the same, look at the last one in the list to find the expiration date. - For authorized use only", OU=Veri Sign Trust Network, O="Veri Sign, Inc.", C=US [certificate is valid from 11/7/06 PM to 11/7/21 PM] [Key Usage extension does not support code signing] X.509, OU=Class 3 Public Primary Certification Authority, O="Veri Sign, Inc.", C=US [certificate is valid from 1/28/96 PM to 8/2/28 PM] s = signature was verified m = entry is listed in manifest k = at least one certificate was found in keystore i = at least one certificate was found in identity scope jar verified.
Run the jarsigner utility on each of the identified signed Jar files in a given product.
However, the extension JAR path is interpreted as a relative path, so in general the extension JAR must be stored in the same directory as the JAR referencing it.
For example, assume the class header in this manifest is Extension with no path specified, indicating that Extension is located in the same directory as the Extension Client JAR file. A signed JAR file is exactly the same as the original JAR file, except that its manifest is updated, and two additional files are added to the META-INF directory, a signature file and a signature block file.
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The classes in extension1can invoke classes in extension2without extension2having to be part of the class path.