Gracefully avoiding NullPointerException in Java

Question

Consider this line:

if (object.getAttribute(\"someAttr\").equals(\"true\")) { // ....

Obviously this line is a potential bug, the attribute

Answer 1

I have another answer;

List> group = jjDatabase.separateRow(db.Select("SELECT * FROM access_user_group  WHERE user_id=1 ;"));

there is not "group_c80" as column in 'access_user_group' in my database, so in get(0).get("group_c80") null pointer exception accords. But i handled it through below code :

for (int j = 1; j < 100; j++) {
                    String rulId="0";//defult value,to privent null pointer exeption in group_c
                    try {
                        rulId = group.get(0).get("group_c" + j)).toString();
                    } catch (Exception ex) {
                        ServerLog.Print( "Handeled error in database for " + "group_c" + (j < 10 ? "0" + j : j) +"This error handeled and mot efect in program");
                        rulId = "0";
                    }}