pskevin opened a new issue, #21935:
URL: https://github.com/apache/beam/issues/21935
### What happened?
```
p.apply(
Create.of(KV.of("X", "Y"))
.withCoder(KvCoder.of(StringUtf8Coder.of(),
StringUtf8Coder.of())))
.apply(GroupByKey.create())
.setCoder(
SerializableCoder.of(
TypeDescriptors.kvs(
TypeDescriptors.strings(),
TypeDescriptors.iterables(TypeDescriptors.strings()))));
```
The pipeline above exemplifies how it is, at the moment, acceptable to
author pipelines with opaque input/output GBK coders whose semantics clearly
violate that of Beam's programming model.
Pipelines of this kind should be rejected by SDKs during pipeline creation
time itself.
### Issue Priority
Priority: 1
### Issue Component
Component: sdk-java-core
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