Bo Wang created HADOOP-8750:
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Summary: Configuration.getClasses never returns default value
Key: HADOOP-8750
URL: https://issues.apache.org/jira/browse/HADOOP-8750
Project: Hadoop Common
Issue Type: Bug
Reporter: Bo Wang
Assignee: Bo Wang
getClasses method in Configuration never returns defaultValue even if the
classnames is not set in Configuration.
public Class<?>[] getClasses(String name, Class<?> ... defaultValue) {
String[] classnames = getTrimmedStrings(name);
if (classnames == null)
return defaultValue;
// Load and return classes using classnames... (omitted)
}
This is because the condition "if (classnames == null)" is always True. If name
is not set in Configuration, classnames will be an empty array (but not null).
To fix it, just change the condition to "if (classnames == null ||
classnames.length == 0)"
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