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);
    }
}

Solution 1

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.

Solution 2

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:

1. Window (menu bar)
2. Preferences
3. Java
4. Installed JREs
5. Select your JRE/JDK
6. Press Edit...
7. Default VM arguments
8. Add -ea

Solution 3

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

Solution 4

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.

Solution 5

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.

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Comments

[Siva Kumar Reddy G]

Thank You ... @thinksteep your answer is very helpful to me .. .

[Siva Kumar Reddy G]

Thank u for detail explaination with picture

[Haravikk]

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.

[Tahlor]

This had no effect for me.

[Ohad Kravchick]

-enableassertions

[kosa]

@OhadKravchick you caught it after almost 5 years, ha ha. Updated answer. Thanks for the comment!