Wei-Chiu Chuang created HADOOP-14385:
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Summary: HttpExceptionUtils#validateResponse hides exceptions
Key: HADOOP-14385
URL: https://issues.apache.org/jira/browse/HADOOP-14385
Project: Hadoop Common
Issue Type: Improvement
Reporter: Wei-Chiu Chuang
Assignee: Wei-Chiu Chuang
In the following code
{code:title=HttpExceptionUtils#validateResponse}
try {
es = conn.getErrorStream();
ObjectMapper mapper = new ObjectMapper();
Map json = mapper.readValue(es, Map.class);
json = (Map) json.get(ERROR_JSON);
String exClass = (String) json.get(ERROR_CLASSNAME_JSON);
String exMsg = (String) json.get(ERROR_MESSAGE_JSON);
if (exClass != null) {
try {
ClassLoader cl = HttpExceptionUtils.class.getClassLoader();
Class klass = cl.loadClass(exClass);
Constructor constr = klass.getConstructor(String.class);
toThrow = (Exception) constr.newInstance(exMsg);
} catch (Exception ex) {
toThrow = new IOException(String.format(
"HTTP status [%d], exception [%s], message [%s] ",
conn.getResponseCode(), exClass, exMsg));
}
} else {
String msg = (exMsg != null) ? exMsg : conn.getResponseMessage();
toThrow = new IOException(String.format(
"HTTP status [%d], message [%s]", conn.getResponseCode(), msg));
}
} catch (Exception ex) {
toThrow = new IOException(String.format( <-- here
"HTTP status [%d], message [%s]", conn.getResponseCode(),
conn.getResponseMessage()));
}
{code}
If the an exception is thrown within the try block, the initial exception is
swallowed, and it doesn't help debugging.
We had to cross reference this exception with the KMS server side to guess what
happened.
IMHO the IOException thrown should also carry the initial exception. It should
also print exClass and exMsg. It probably failed to instantiate an exception
class.
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