What do these VM options do?

Question

For an assignment I had to edit the VM options of a Java project in Intellij. The following line had to be added to the options:

-Djava.compiler=NONE -DXint

However, I have no clue what these options do, so I'm asking it here. I was not able to find anything online about this.

Do note that flags only have meaning in the right Java version e.g. a flag introduced in Java 9 won't have any effect in Java 8. — Karol Dowbecki, Jan 03 '20 at 13:26

score 3 · Accepted Answer · answered Jan 03 '20 at 13:26

3

The flag -Djava.compiler=NONE disables Just-In-Time (JIT)-compilation, as explained here.

The flag -DXint runs the JVM in interpreted mode, i.e. bytecode is interpreted, never compiled to machine code, as explained here.

answered Jan 03 '20 at 13:26

Turing85

1 Answers1