How can I disable Java garbage collector?

Question

We have a PHP webapp that calls a Java binary to produce a PDF report (with JasperReports). The Java binary outputs the PDF to standard output and exits; the PHP then sends

Answer 1

Java 11 comes with an no-op garbage collector.

It can be enabled by the -XX:+UseEpsilonGC option at JVM start.

According to the JEP decription one of its goals is to make certain short-lived jobs more efficient, what might be you use case:

Extremely short lived jobs. A short-lived job might rely on exiting quickly to free the resources (e.g. heap memory). In this case, accepting the GC cycle to futilely clean up the heap is a waste of time, because the heap would be freed on exit anyway. Note that the GC cycle might take a while, because it would depend on the amount of live data in the heap, which can be a lot.