Bug in valueOf

[yuemingl]

I tried this simple test case:

package symjava.test;
public class TestValueOf {
    public static class Car {
        public int id;
        public Car(int id) {
            this.id = id;
        }
        public Car add(Car c) {
            return new Car(this.id+c.id);
        }
    }
    public static class Jeep extends Car {
        public Jeep(int id) {
            super(id);
        }
        public static Jeep valueOf(Car c) {
            return new Jeep(c.id);
        }
    }
    public static void main(String[] args) {
        Car c1 = new Car(1);
        Car c2 = new Car(10);
        Car c12 = c1 + c2;
        //Jeep j = c12; //works
        //Jeep j = Jeep.valueOf(c1 + c2); //works
        Jeep j = c1 + c2; //NOT work!!!
        System.out.println(j.id);
    }
}

An exception is thrown out:

Exception in thread "main" java.lang.VerifyError: Operand stack underflow Exception Details: Location: symjava/test/TestValueOf.main([Ljava/lang/String;)V @25: invokestatic Reason: Attempt to pop empty stack. Current Frame: bci: @25 flags: { } locals: { '[Ljava/lang/String;', 'symjava/test/TestValueOf$Car', 'symjava/test/TestValueOf$Car', 'symjava/test/TestValueOf$Car' } stack: { } Bytecode: 0000000: bb00 1059 04b7 0012 4cbb 0010 5910 0ab7 0000010: 0012 4d2b 2cb6 0015 4eb8 0019 3a04 b200 0000020: 1f19 04b4 0025 b600 29b1

at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2615)
at java.lang.Class.getMethod0(Class.java:2856)
at java.lang.Class.getMethod(Class.java:1668)
at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:494)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:486)

[msteinbeck]

I can compile and run your example with both, IntelliJ and javac. Are you using Eclipse? Is this bug already fixed?

[masl123]

Another Workaround for this problem is, to simply add a cast. (Jeep j = (Car)(c1 + c2)). This works for some reason.