Getting java.lang.UnsupportedOperationException in List

Question

I am getting

java.lang.UnsupportedOperationException

exception in List.

Why does this exception occur?

Code

List<String> smsUserList = new ArrayList<String>();
    if (event.getEventTemplate().equalsIgnoreCase(CommunicationConstants.MEMBER)) {
        String testNumbers = env.getRequiredProperty(CommunicationConstants.TEST_SMS_NUMBRES);
        String[] testSmsNumber = testNumbers.split(",");
        if (null != testSmsNumber && testSmsNumber.length > 1) {
            smsUserList = Arrays.asList(testSmsNumber);

        }

    }
    if (event.getEventTemplate().equalsIgnoreCase(CommunicationConstants.AGENT)) {
        String testNumbers = env.getRequiredProperty(CommunicationConstants.TEST_SMS_NUMBRES);
        String[] testSmsNumber = testNumbers.split(",");
        if (null != testSmsNumber && testSmsNumber.length > 1) {
            smsUserList = Arrays.asList(testSmsNumber);
        }
    }

    Set<SMSCommunicationRecipient> smsRecipientAll = event.getSmsCommunicationRecipient();
    for (SMSCommunicationRecipient smsRecipient : smsRecipientAll) {
        String smsRecipientValue = smsRecipient.getRecipientGroupId().getReferenceTypeValue();
        if (smsRecipientValue.equalsIgnoreCase(CommunicationConstants.MEMBER)) {
            List<String> memberContact = (List<String>) communicationInput
                    .get(CommunicationConstants.MEMBER_CONTACT_NUMBER_LIST);
            if (CollectionUtils.isNotEmpty(memberContact)) {
                for (String smsNumber : memberContact) {
                    smsUserList.add(smsNumber);
                }
            }
        }
        if (smsRecipientValue.equalsIgnoreCase(CommunicationConstants.AGENT)) {
            List<String> agentContact = (List<String>) communicationInput
                    .get(CommunicationConstants.AGENT_CONTACT_NUMBER_LIST);
            if (CollectionUtils.isNotEmpty(agentContact)) {
                for (String smsNumber : agentContact) {
                    smsUserList.add(smsNumber);
                }
            }
        }
    }

May I know, from which line you are getting this .? – ideano1 Jul 25 '18 at 11:10 — ideano1, Jul 25 '18 at 11:10

score 3 · Answer 1 · answered Jul 25 '18 at 11:11

Arrays.asList(testSmsNumber) returns a fixed sized list, so you cannot add elements to it.

Change

smsUserList = Arrays.asList(testSmsNumber);

to

smsUserList = new ArrayList<>(Arrays.asList(testSmsNumber));

Or, since you are already creating an ArrayList with:

List<String> smsUserList = new ArrayList<String>();

change

smsUserList = Arrays.asList(testSmsNumber);

to

smsUserList.addAll(Arrays.asList(testSmsNumber));

Though if you take this second approach, depending on your logic, you might want to call smsUserList.clear() before smsUserList.addAll() (since there are multiple places in your code that assign to the smsUserList variable, so perhaps you want the List to be cleared each time you make that assignment).

Getting java.lang.UnsupportedOperationException in List

Code

1 Answers1