belugabehr commented on a change in pull request #836: HBASE-23308: Review of
NullPointerExceptions
URL: https://github.com/apache/hbase/pull/836#discussion_r347148986
##########
File path:
hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/BackupDriver.java
##########
@@ -187,10 +188,7 @@ public static void main(String[] args) throws Exception {
@Override
public int run(String[] args) throws IOException {
- if (conf == null) {
- LOG.error("Tool configuration is not initialized");
- throw new NullPointerException("conf");
- }
+ Objects.requireNonNull(conf, "Tool configuration is not initialized");
Review comment:
@saintstack Less code. I also like the JavaDoc for the method. I copy &
paste its message to use the same helpful formatting.
Trying to introduce it so that others may stumble upon and learn. Best used
in this way:
```
public MyClass(String val) {
this.val = Objects.requireNonNull(val);
}
```
More concise than the alternative:
```
public MyClass(String val) {
if (val == null) {
throw new NullPointerException();
}
this.val = val;
}
```
But if it's going to be used one way, might as well be used everywhere.
Pretty versatile that way.
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