TaiJuWu opened a new pull request, #21162:
URL: https://github.com/apache/kafka/pull/21162
The original error show `java.util.Collections$3@af78c87`, after change it
show the `[config.key.3, config.key.1, config.key.2]`
Example:
```
@Test
def testPropertiesContent(): Unit = {
val props = new Properties()
props.put("config.key.1", "value1")
props.put("config.key.2", "value2")
props.put("config.key.3", "value3")
System.err.println("\nProperties content:")
System.err.println(s" props = $props")
// output: props = {config.key.3=value3, config.key.2=value2,
config.key.1=value1}
System.err.println(s"\n props.keySet() = ${props.keySet()}")
// output: props.keySet() = [config.key.3, config.key.2, config.key.1]
System.err.println(s"\n Set from keys = ${props.keys()}")
// output: Set from keySet = java.util.Collections$3@af78c87
}
```
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