Java assertions in IntelliJ IDEA Community?

Question

How do I enable assertions in IntelliJ? My code compiles but the assertions do not show up anywhere on the output.

For example:

public static void main(String[] args) { 
    int someInt = 5;
    assert someInt > 5; 
    assert someInt <= 5; 
}

Can you please post an example of how you are using `assert` and where it is failing? https://stackoverflow.com/help/minimal-reproducible-example — Freiheit, Aug 19 '21 at 12:51
one example: ` public static void main(String[] args) { int someInt = 5; assert someInt > 5; assert someInt <= 5; }` this results in an empty console, no exceptions thrown — anon, Aug 22 '21 at 08:48
I ran your code in IntelliJ version 2020.3 and JDK 8. I do not see the assertions in the IntelliJ console either. — Freiheit, Aug 23 '21 at 13:14

score 6 · Accepted Answer · answered Aug 23 '21 at 13:21

Based on this answer for Eclipse you need to pass a JVM option -ea to enable assertions in any JVM. It's not unique to any specific IDE.

For IntelliJ it looks like this in the run config:

Note that you may have to select "Modify Options" to make the JVM options input box visible to enter the -ea flag.

1 Answers1