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up vote 2 down vote favorite

I'm currently retrieving data using XML-RPC, this is what I have:

Object[] params = new Object[]{param1, param2};
Object[] obj = new Object[]{};

try {
    obj = (Object[]) client.execute("method.name", params);
} catch (XmlRpcException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} 

return obj;

The problem is that sometimes it will return -1 and I'll get this error: java.lang.Integer cannot be cast to [Ljava.lang.Object; - I was wondering if there was a way around this problem?

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3  
It looks like the return value of client.execute isn't actually an Object[], but rather an Integer. – Louis Wasserman Apr 19 '12 at 23:42
1  
Or maybe an Object – Jordão Apr 19 '12 at 23:48

1 Answer

up vote 3 down vote accepted

You have to check the type of the return value before casting.

Object result = client.execute(...);
if (result instanceof Integer) {
  Integer intResult = (Integer) result;
  ... handle int result
}    
else if (result instanceof Object[]) {
  obj = (Object[]) result;
}
else {
  ... something else
}

I'd be tempted to create a strongly-typed API around these RPC calls. But then again, maybe that's what you're already doing...

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