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https://issues.apache.org/jira/browse/BEAM-6096?focusedWorklogId=167618&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-167618
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ASF GitHub Bot logged work on BEAM-6096:
----------------------------------------
Author: ASF GitHub Bot
Created on: 20/Nov/18 04:52
Start Date: 20/Nov/18 04:52
Worklog Time Spent: 10m
Work Description: cushon commented on a change in pull request #7085:
[BEAM-6096] illegal signature attribute when compiling with JDK 11
URL: https://github.com/apache/beam/pull/7085#discussion_r234868645
##########
File path:
sdks/java/harness/src/main/java/org/apache/beam/fn/harness/WindowMergingFnRunner.java
##########
@@ -130,16 +130,16 @@ private MergingViaWindowFnRunner(WindowFn<?, W>
windowFn) {
this.mergedWindows = new ArrayList<>();
this.currentWindows = new ArrayList<>();
this.mergeContext =
- windowFn.new MergeContext() {
+ ((WindowFn) windowFn).new MergeContext() {
Review comment:
It's a `WindowFn<?, W>`, and anonymous classes whose enclosing instance
types contain captured wildcards are illegal:
https://bugs.openjdk.java.net/browse/JDK-8203436.
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Issue Time Tracking
-------------------
Worklog Id: (was: 167618)
Time Spent: 0.5h (was: 20m)
> 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
> Time Spent: 0.5h
> 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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