suztomo edited a comment on pull request #15835:
URL: https://github.com/apache/beam/pull/15835#issuecomment-954348212
` ./gradlew -p sdks/java/io/google-cloud-platform test
--tests=GcpApiSurfaceTest` fails:
```
java.lang.AssertionError:
Expected: API surface to include only:
Classes in package "com.google.api.core"
Classes in package "com.google.api.client.googleapis"
Classes in package "com.google.api.client.http"
...
but: The following disallowed classes appeared on the API surface:
interface com.google.common.base.ParametricNullness exposed via:
interface com.google.common.base.ParametricNullness
interface com.google.common.base.Function
class com.google.common.base.Optional
class com.google.cloud.bigtable.config.CallOptionsConfig
class com.google.cloud.bigtable.config.BigtableOptions
class org.apache.beam.sdk.io.gcp.bigtable.BigtableIO$Write
class org.apache.beam.sdk.io.gcp.bigtable.BigtableIO
at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)
at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:6)
at
org.apache.beam.sdk.io.gcp.GcpApiSurfaceTest.testGcpApiSurface(GcpApiSurfaceTest.java:128)
```
https://ci-beam.apache.org/job/beam_PreCommit_Java_Commit/19434/testReport/
The ParametricNullness is a new annotation in Guava
https://github.com/google/guava/commit/40faa2cb6a7e4aa9535b1a2a21265d533aca3eae.
This annotation tells language tools (Kotlin platform, especially) about the
nullable attribute of the parameter. Example usage of the annotation:
```
@ParametricNullness
T get();
```
This means that the method `get()` is nullable if type parameter `T` is
nullable. It's non-null if `T` is non-null.
This ParametricNullness annotation is not intend to be used other than Guava
because it's not public. It's only visible to com.google.common.base package.
ApiSurfaceTest should not detect this as exposed APIs.
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