I refactor it as
```java
try {
byte[] b = InstantiationUtil.serializeObject(parameter);
final ParameterTool copy =
InstantiationUtil.deserializeObject(b, getClass().getClassLoader());
internalValidate(copy);
} catch (Exception e) {
e.printStackTrace();
Assert.fail(e.getMessage());
}
```
this keeps the root cause and save us from modify signature of methods calling
`AbstractParameterToolTest#validate`. If you prefer to propagate it, I am not
opposite to it.
[ Full content available at: https://github.com/apache/flink/pull/6737 ]
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