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https://issues.apache.org/jira/browse/BEAM-5061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16669552#comment-16669552
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Kenneth Knowles commented on BEAM-5061:
---------------------------------------
My (shallow) understanding is that a bytebuddy upgrade is needed, and it has
some new conventions to support new and tighter aspects of Java's access model.
> Invisible parameter type exception in JDK 10
> --------------------------------------------
>
> Key: BEAM-5061
> URL: https://issues.apache.org/jira/browse/BEAM-5061
> Project: Beam
> Issue Type: Sub-task
> Components: sdk-java-core
> Affects Versions: 2.5.0
> Reporter: Mike Pedersen
> Priority: Major
>
> When using JDK 10, using a ParDo after a CoGroupByKey seems to create the
> following exception when executed on local runner:
> {noformat}
> Exception in thread "main"
> org.apache.beam.repackaged.beam_runners_direct_java.com.google.common.util.concurrent.UncheckedExecutionException:
> java.lang.IllegalStateException: Invisible parameter type of Main$1 arg0 for
> public Main$1$DoFnInvoker(Main$1)
> at
> org.apache.beam.repackaged.beam_runners_direct_java.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2214)
> at
> org.apache.beam.repackaged.beam_runners_direct_java.com.google.common.cache.LocalCache.get(LocalCache.java:4053)
> at
> org.apache.beam.repackaged.beam_runners_direct_java.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:4057)
> ...
> Caused by: java.lang.IllegalStateException: Invisible parameter type of
> Main$1 arg0 for public Main$1$DoFnInvoker(Main$1)
> at
> org.apache.beam.repackaged.beam_sdks_java_core.net.bytebuddy.dynamic.scaffold.InstrumentedType$Default.validated(InstrumentedType.java:925)
> at
> org.apache.beam.repackaged.beam_sdks_java_core.net.bytebuddy.dynamic.scaffold.MethodRegistry$Default.prepare(MethodRegistry.java:465)
> at
> org.apache.beam.repackaged.beam_sdks_java_core.net.bytebuddy.dynamic.scaffold.subclass.SubclassDynamicTypeBuilder.make(SubclassDynamicTypeBuilder.java:170)
> ...
> {noformat}
> This error disappears completely when using JDK 8. Here is a minimal example
> to reproduce it:
> {code:java}
> import org.apache.beam.sdk.Pipeline;
> import org.apache.beam.sdk.options.PipelineOptions;
> import org.apache.beam.sdk.options.PipelineOptionsFactory;
> import org.apache.beam.sdk.transforms.Create;
> import org.apache.beam.sdk.transforms.DoFn;
> import org.apache.beam.sdk.transforms.ParDo;
> import org.apache.beam.sdk.transforms.join.CoGbkResult;
> import org.apache.beam.sdk.transforms.join.CoGroupByKey;
> import org.apache.beam.sdk.transforms.join.KeyedPCollectionTuple;
> import org.apache.beam.sdk.values.KV;
> import org.apache.beam.sdk.values.PCollection;
> import org.apache.beam.sdk.values.TupleTag;
> import java.util.Arrays;
> import java.util.List;
> public class Main {
> public static void main(String[] args) {
> PipelineOptions options = PipelineOptionsFactory.create();
> Pipeline p = Pipeline.create(options);
> final TupleTag<String> emailsTag = new TupleTag<>();
> final TupleTag<String> phonesTag = new TupleTag<>();
> final List<KV<String, String>> emailsList =
> Arrays.asList(
> KV.of("amy", "a...@example.com"),
> KV.of("carl", "c...@example.com"),
> KV.of("julia", "ju...@example.com"),
> KV.of("carl", "c...@email.com"));
> final List<KV<String, String>> phonesList =
> Arrays.asList(
> KV.of("amy", "111-222-3333"),
> KV.of("james", "222-333-4444"),
> KV.of("amy", "333-444-5555"),
> KV.of("carl", "444-555-6666"));
> PCollection<KV<String, String>> emails = p.apply("CreateEmails",
> Create.of(emailsList));
> PCollection<KV<String, String>> phones = p.apply("CreatePhones",
> Create.of(phonesList));
> PCollection<KV<String, CoGbkResult>> results =
> KeyedPCollectionTuple.of(emailsTag, emails)
> .and(phonesTag, phones)
> .apply(CoGroupByKey.<String>create());
> PCollection<String> contactLines =
> results.apply(
> ParDo.of(
> new DoFn<KV<String, CoGbkResult>, String>() {
> @ProcessElement
> public void processElement(ProcessContext
> c) {
> KV<String, CoGbkResult> e =
> c.element();
> String name = e.getKey();
> Iterable<String> emailsIter =
> e.getValue().getAll(emailsTag);
> Iterable<String> phonesIter =
> e.getValue().getAll(phonesTag);
> String formattedResult = "";
> c.output(formattedResult);
> }
> }));
> p.run().waitUntilFinish();
> }
> }{code}
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