How to enable the Java keyword assert in Eclipse program-wise?

Question

How can I enable the assert keyword in Eclipse?

public class A
{
    public static void main(String ... args)
    {
        System.out.println(1);
        assert false;
        System.out.println(2);
    }
}

The JVM takes argument `-enableassertions`, or `-ea`. Not sure where that is specified in Eclipse though. — hmjd, Jul 10 '12 at 14:11

score 106 · Accepted Answer · answered Jul 10 '12 at 14:30

106

To be specific:

Go to Run->run configuration
select java application in left nav pan.
right click and select New.
select Arguments tab
Add -ea in VM arguments.

enter image description here

answered Jul 10 '12 at 14:30

Priyank Doshi

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Thank u for detail explaination with picture – Siva Kumar Reddy G Jul 10 '12 at 16:32
1

This had no effect for me. – Tahlor Sep 13 '17 at 00:24

noone · Answer 2 · 2014-03-12T13:56:58.637

49

If anyone wants to enable assertions by default (in contrast to enabling them for just a single run configuration), it is possible with the following steps:

Window (menu bar)
Preferences
Java
Installed JREs
Select your JRE/JDK
Press Edit...
Default VM arguments
Add -ea

edited Mar 12 '14 at 13:56

answered Feb 14 '14 at 18:34

noone

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This is a very useful supplement; I can't believe I've been adding `-ea` to every run configuration (specifically while debugging) as assertions are such a handy, yet underused, feature during development. – Haravikk Jun 15 '14 at 16:39

score 9 · Answer 3 · answered Jul 10 '12 at 14:17

9

Form the menu bar, select Run -> Run Configurations....
Select Arguments tab.
Add -ea to VM arguments.
Click Apply.
Click Run.

answered Jul 10 '12 at 14:17

Eng.Fouad

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kosa · Answer 4 · 2017-12-17T23:55:29.863

2

You need to go to run configurations and add vm arguments as "-enableassertions" (or) "-ea"

After that when you run code with assert statement, you will see assert in action.

edited Dec 17 '17 at 23:55

answered Jul 10 '12 at 14:12

kosa

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-enableassertions – Ohad Kravchick Dec 15 '17 at 23:00
@OhadKravchick you caught it after almost 5 years, ha ha. Updated answer. Thanks for the comment! – kosa Dec 17 '17 at 23:55

Stephen C · Answer 5 · 2012-07-10T14:58:36.930

2

Java introduced the assert keyword, so the way to enable source-level support is to make sure that Eclipse's Java compliance level is 1.4 or higher. (The chances are that the compliance level is already higher than that ...)

To cause a Java application launched from Eclipsed to run with assertion checking enabled, add the "-ea" argument to the VM arguments in the launcher configuration's "Arguments" tab.

edited Jul 10 '12 at 14:58

answered Jul 10 '12 at 14:17

Stephen C

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score 0 · Answer 6 · answered Mar 17 '18 at 04:14

0

In case someone uses IDEA, -ea is enabled by default in some IDEA versions, but disabled in others. To manually configure it, it is under run -> edit configuration -> vm option

answered Mar 17 '18 at 04:14

Tiina

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How to enable the Java keyword assert in Eclipse program-wise?

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