Rancho-7 commented on code in PR #19039:
URL: https://github.com/apache/kafka/pull/19039#discussion_r1971676812


##########
clients/src/test/java/org/apache/kafka/common/config/AbstractConfigTest.java:
##########
@@ -450,6 +450,33 @@ public void testConfigProvidersPropsAsParam() {
         MockFileConfigProvider.assertClosed(id);
     }
 
+    @Test
+    public void testAutomaticConfigProvidersWithFullClassName() {
+        Properties props = new Properties();
+        props.put("config.providers", "file");
+        props.put("config.providers.file.class", 
MockFileConfigProvider.class.getName());
+        String id = UUID.randomUUID().toString();
+        props.put("config.providers.file.param.testId", id);
+        props.put("test.key", "${file:/path:key}");
+
+        System.setProperty(AbstractConfig.AUTOMATIC_CONFIG_PROVIDERS_PROPERTY, 
"file");
+        assertThrows(ConfigException.class, () -> new 
TestIndirectConfigResolution(props, Collections.emptyMap()));
+
+        System.setProperty(AbstractConfig.AUTOMATIC_CONFIG_PROVIDERS_PROPERTY, 
MockFileConfigProvider.class.getName());
+        TestIndirectConfigResolution config = new 
TestIndirectConfigResolution(props, Collections.emptyMap());
+        assertEquals("testKey", config.originals().get("test.key"));
+        MockFileConfigProvider.assertClosed(id);
+
+        System.setProperty(AbstractConfig.AUTOMATIC_CONFIG_PROVIDERS_PROPERTY,
+                MockFileConfigProvider.class.getName() + "," +
+                        
"org.apache.kafka.common.config.provider.EnvVarConfigProvider");

Review Comment:
   Thanks for pointing that out! Fixed it.



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