java.lang.UnsupportedOperationException at java.util.AbstractList.remove

Question

I am trying to remove an item of a List.

list.remove(key);

However, it throws an exception:

Caused by: java.lang.UnsupportedOperationException
    at java.util.AbstractList.remove(AbstractList.java:161)
    at java.util.AbstractList$Itr.remove(AbstractList.java:374)
    at java.util.AbstractCollection.remove(AbstractCollection.java:293)
    at bean.Bean.deleteRow(Bean.java:46)

How is this caused and how can I solve it?

Yes, "serverError: class javax.faces.el.EvaluationException" sounds like you're just looking at the client-side error message, but javax.faces.el.EvaluationException is a Java exception, so you should read the server logs. — user201891
– user201891, Commented Nov 2, 2016 at 16:58
I tried to change the bean and its scope from cdi Named to ManagedBean but I still have the error — user6008337
– user6008337, Commented Nov 2, 2016 at 17:25
This has nothing to do with JSF. You'd have had exactly the same problem when running the very same Java code using a plain Java application class with a main() method. Including the entire Java EE web interface in a question about an exception of java.lang.* package originating from your own code is unnecessary. I have trimmed down the irrelevant noise from the question to make it better focused. — BalusC
– BalusC, Commented Nov 2, 2016 at 17:47
How is the list created? You're probably running into an issue like the one described in this question. — user201891
– user201891, Commented Nov 2, 2016 at 18:07

user6008337 · Accepted Answer · 2016-11-03 10:07:04Z

5

The issue was during Arrays.asList() used to initialize the list, by using list.add(String) i fixed the problem

answered Nov 3, 2016 at 10:07

user6008337

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