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https://issues.apache.org/jira/browse/BEAM-6096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pablo Estrada resolved BEAM-6096.
---------------------------------
Resolution: Fixed
Fix Version/s: 2.10.0
> illegal signature attribute when compiling with JDK 11
> ------------------------------------------------------
>
> Key: BEAM-6096
> URL: https://issues.apache.org/jira/browse/BEAM-6096
> Project: Beam
> Issue Type: Sub-task
> Components: sdk-java-core
> Reporter: Liam Miller-Cushon
> Assignee: Liam Miller-Cushon
> Priority: Major
> Fix For: 2.10.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> The following code is invalid, and fails to compile with the JDK 11 javac:
> https://github.com/apache/beam/blob/1cbbc4d8755130f137e7d9ef4813e8d3b917cb70/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/WindowMergingFnRunner.java#L132-L144
> The error is:
> ```
> error: error while generating class <anonymous
> org.apache.beam.fn.harness.WindowMergingFnRunner$MergingViaWindowFnRunner$1>
> (illegal signature attribute for type CAP#1)
> where CAP#1 is a fresh type-variable:
> CAP#1 extends Object from capture of ?
> ```
> The code was previously accepted by javac due to a bug, which has been fixed
> in JDK 11: https://bugs.openjdk.java.net/browse/JDK-8203436
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