eshizhan commented on a change in pull request #10938:
URL: https://github.com/apache/kafka/pull/10938#discussion_r662351754
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File path: clients/src/main/java/org/apache/kafka/common/config/ConfigDef.java
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@@ -725,14 +725,21 @@ else if (value instanceof String)
if (value instanceof Class)
return value;
else if (value instanceof String) {
- ClassLoader contextOrKafkaClassLoader =
Utils.getContextOrKafkaClassLoader();
- // Use loadClass here instead of Class.forName because
the name we use here may be an alias
- // and not match the name of the class that gets
loaded. If that happens, Class.forName can
- // throw an exception.
- Class<?> klass =
contextOrKafkaClassLoader.loadClass(trimmed);
- // Invoke forName here with the true name of the
requested class to cause class
- // initialization to take place.
- return Class.forName(klass.getName(), true,
contextOrKafkaClassLoader);
+ try {
+ ClassLoader contextOrKafkaClassLoader =
Utils.getContextOrKafkaClassLoader();
+ // Use loadClass here instead of Class.forName
because the name we use here may be an alias
+ // and not match the name of the class that gets
loaded. If that happens, Class.forName can
+ // throw an exception.
+ Class<?> klass =
contextOrKafkaClassLoader.loadClass(trimmed);
+ // Invoke forName here with the true name of the
requested class to cause class
+ // initialization to take place.
+ return Class.forName(klass.getName(), true,
contextOrKafkaClassLoader);
+ } catch (ClassNotFoundException e) {
+ // load class from kafkaClassLoader when it not in
ContextClassLoader
+ ClassLoader kafkaClassLoader =
Utils.getKafkaClassLoader();
Review comment:
It's use `ContextClassLoader` first in
`Utils.getContextOrKafkaClassLoader`. And if `contextOrKafkaClassLoader` is
`KafkaClassLoader`, it will be load class twice with failed. Whatever happens,
an exception will thrown.
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