NullPointerException在java中解析字符串时出错

Question

这是我解析字符串的代码，该字符串的格式为#some headers＃val1，val2，val3，val4，val5＃。所以，我试图解析格式之外的val。我在提交的代码的最后一行收到NullPointerException。任何人都可以帮助解决这个问题

String stringVal = "formatted text as mentioned above";

System.out.println("In string parser");
String delimit = "#";
int limit = 4;
output = stringVal.split(delimit, limit);
System.out.println("after split : "+ output[2]);

DataVals = output[2].split(",", 6);
System.out.println("DataVals :"+Arrays.toString(DataVals));
nCtrlNo[j] = DataVals[0];   //-----> error occurs on this line

班级成员DataVals＆amp; nCtrlNo定义为

static String[] DataVals;
static String[]  nCtrlNo;