2 ms·

My impression from reading this was it was about knowing which classes reference which other classes when and which jars everything is in. So I think you’re ri

• brabel 2y ago
  The JEP explains what this does: "The AOT cache builds upon CDS by not only reading and parsing class files ahead-of-time but also loading and linking them." While CDS (which has been available for years now) only caches a parsed form of the class files that got loaded by the application, the AOT cache will also "load and link" the classes. The ClassLoader.load method docs explain what loading means: https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/ClassLoader.html#loadClass(java.lang.String,boolean) https://docs.oracle.com/en/java/javase/21/docs/api/java.base... 1. find the class (usually by looking at the file-index of the jar, which is just a zip archive, but ClassLoaders can implement this in many ways). 2. link the class, which is done by the resolveClass method: https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/ClassLoader.html#resolveClass(java.lang.Class) https://docs.oracle.com/en/java/javase/21/docs/api/java.base... and explained in the Java Language Specification: https://docs.oracle.com/javase/specs/jls/se21/html/jls-12.html#jls-12.3 https://docs.oracle.com/javase/specs/jls/se21/html/jls-12.ht... "Three different activities are involved in linking: verification, preparation, and resolution of symbolic references." Hence, I assume the AOT cache will somehow keep even symbolic references between classes, which is quite interesting.