ADDITIONAL SYSTEM INFORMATION :
Java 11.0.1, java 1.8. Windows 10 machine with latest updates.

A DESCRIPTION OF THE PROBLEM :
According to jls-5.1.7 "If the value p being boxed is an integer literal of type int between -128 and 127 inclusive (§3.10.1), or the boolean literal true or false (§3.10.3), or a character literal between '\u0000' and '\u007f' inclusive (§3.10.4), then let a and b be the results of any two boxing conversions of p. It is always the case that a == b."
However in case of method called via reflection boxed value is always created via `new PrimitiveWrapper()`.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a method returning primitive value (boolean will do).
Call the method via reflection (class.getMethod("methodName").invoke(null))
Compare resulting value with expected.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
true
true
true
true
true
ACTUAL -
false
true
true
false
true

---------- BEGIN SOURCE ----------
public class ReflectionTest {
    public static boolean testTrue() {
        return true;
    }

    public static int test42() {
        return 42;
    }

    public static void main(String[] args) throws Exception {
        final Object trueResult = ReflectionTest.class.getMethod("testTrue").invoke(null);
        final Object trueResult2 = testTrue();
        final Object test42Result = ReflectionTest.class.getMethod("test42").invoke(null);

        System.out.println(trueResult == Boolean.TRUE);
        System.out.println(trueResult2 == Boolean.TRUE);
        System.out.println(Boolean.TRUE.equals(trueResult));
        System.out.println(Integer.valueOf(42) == test42Result);
        System.out.println(Integer.valueOf(42).equals(test42Result));
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Use BoxedType.equals() instead for raw ==

FREQUENCY : always