org.springframework.util.Assert

import org.springframework.util.Assert;

public class Demo {
    public static void main(String[] args) {
        String location = null;
        Assert.notNull(location, "Location must not be null");
        System.out.println("location = [" + location + "]");
    }
}

Exception in thread "main" java.lang.IllegalArgumentException: Location must not be null
	at org.springframework.util.Assert.notNull(Assert.java:115)
	at Demo.main(Demo.java:9)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)