jsa

I'm trying to know whether creating a Class Data Sharing archive (by running java -Xshare:dump ) compiles byte code into native code. There is not a lot of documentation about the internals of Class Data Sharing. The page I linked says that java -Xshare:dump loads a set of classes from the system jar file into a private internal representation, and dumps that representation to a file. But says nothing about whether this code is compiled or not. (Possibly related: Speed up application start by adding own application classes to classes.jsa ) In both cases it's native code in the cache (see the

To speed up the startup time of the JVM, the Sun developers decided it is a good idea to precompile the standard runtime classes for a platform during installation of the JVM. These precompiled classes can be found e.g. at: $JAVA_HOME\jre\bin\client\classes.jsa My company currently develops a Java standalone application which brings its own JRE, so it would be a fantastic option to speed up our application start time by adding our own application classes to this jsa file, too. I don't believe the JSA file was created by magic, so: How is it created? And how can I trick the JVM into