And not, in a more fundamental way. Sharing a JVM just isn't the same thing as a sandboxed process. OSGI was probably the closest thing that tried to embrace t

And not, in a more fundamental way. Sharing a JVM just isn't the same thing as a sandboxed process. OSGI was probably the closest thing that tried to embrace that model, and it didn't turn out very well (putting it mildly). If the JVM actually did provide the same guarantees and restrictions as a real container, that would have been very useful.