java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to java.util.List - classcastexception

Question

I have a List<List<String>> dataTableList and I would like to get a specific list from there and put it on my List<String> dataList so that I could loop through that specific lists' value and alter it.
However, whenever I try to do that,I always get an error of:
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to java.util.List.
Here's a sample of how I am trying to assign a specific list from dataTableList to dataList:
//First I looped through the List of Lists and called each list fetched as dataList
for(List<String> dataList : getTryLang().getDataTableList()){
//then, I created an iterator to be used later when I return the List I fetched with altered value
int iter = 0;
//next, I created a for-loop to iterate through the values of the List the I feched
for(int x; x < dataList.size(); x++){
//here, I formatted each value to amount or currency format.
dataList.set(x, getDataConvert().convertAmount(dataList.get(x)));
//finally, after I formatted everything, I returned it or set it to the specific index it's been located before
getTryLang().getDataTableList().set(iter, dataList);
}
iter++;
}
EDIT:
Here's my code and I modified some of it and didn't include some so that I could focus on expressing where the problem occurs.
Here's my TryLang.java:
#ManagedBean
#SessionScoped
public class TryLang implements Serializable {
public TryLang() {}
//declare
private List<List<String>> dataTableList;
//getter setter
public List<List<String>> getDataTableList() {
return dataTableList == null ? dataTableList = new ArrayList<>() : dataTableList;
}
public void setDataTableList(List<List<String>> dataTableList) {
this.dataTableList = dataTableList;
}
}
Then here's my BookOfAccountsController.java:
#ManagedBean
#RequestScoped
public class BooksOfAccountsController implements Serializable {
public BooksOfAccountsController() {}
//declare
#ManagedProperty(value = "#{dataConvert}")
private DataConvert dataConvert;
#ManagedProperty(value = "#{tryLang}")
private TryLang tryLang;
//getter setter NOTE: I wouldn't include other getter setters to shorten the code here :)
public TryLang getTryLang() {
return tryLang == null ? tryLang = new TryLang() : tryLang;
}
public void setTryLang(TryLang tryLang) {
this.tryLang = tryLang;
}
//I would just go straight to the method instead
public void runBooksOfAccounts() throws SystemException, SQLException {
//So there are dbCons here to connect on my DB and all. And I'll just go straight on where the List<List<String>> is being set
//Here's where the List<List<String>> is being set
getTryLang().setDataTableList(getCemf().getFdemf().createEntityManager().createNativeQuery("SELECT crj.* FROM crj_rep crj").getResultList());
getTryLang().setDataTableColumns(getCemf().getFdemf().createEntityManager().createNativeQuery("SELECT col.column_name FROM information_schema.columns col WHERE table_schema = 'public' AND table_name = 'crj_rep'").getResultList());
for (int x = 0; x < getTryLang().getDataTableColumns().size(); x++) {
try {
Integer.parseInt(getTryLang().getDataTableColumns().get(x));
getTryLang().getDataTableColumns().set(x, getDataConvert().accountCodeConvert(getTryLang().getDataTableColumns().get(x)));
//then here is where the error points at
for (List<String> dataList : getTryLang().getDataTableList()) {
try{
int iter = 0;
dataList.set(x, getDataConvert().convertAmount(new BigDecimal(dataList.get(x))));
getTryLang().getDataTableList().set(iter, dataList);
iter++;
}catch(ClassCastException ne){
System.out.println("cannot convert " + ne);
}
}
} catch (NumberFormatException ne) {
//print the error
}
}
}
}