Question

I use red5 and setting/getting attributes using the IConnection class, but that’s really not relevant.

‘L’ means long in java. so 0L is 0 type Long instead of just ‘0’ which is 0 type Integer.

What is the difference between [Ljava.lang.Long and java.lang.Long in the following error message:

stack trace: java.lang.ClassCastException: [Ljava.lang.Long; cannot be cast to java.lang.Long

---

update

code sample:

 static Long getLongAttribute(IConnection conn, String attribute) {
    Long result=null;
    try {
        if (!conn.hasAttribute(attribute))
            throw new Exception(attribute +  " - Long attribute not found!");
      result = conn.getLongAttribute(attribute); // <--- ERRROR ON THIS LINE
    } catch (Exception e) {
        _handleException(e);
    }
    return result;
}

Answer 1

The first object is array of Long, the second is just Long. Try this

    Long l = 1l;
    Long[] l2 = {};
    System.out.println(l.getClass());
    System.out.println(l2.getClass());

Output

class java.lang.Long
class [Ljava.lang.Long;

But I do agree that [L_class_; presentation for array types is highly confusing. I wonder how it came to be that way.