Java 21 breaks access to netty-buffer class

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#1,106 2026年4月6日に作成コメント 1 件リアクション 0 件担当者 0 名 GitHub で見る

まだ誰も着手していません。

評価

難易度: 4/5
見積もり時間: 3〜5日
初心者へのやさしさ: 42/100

issue の種類: バグ
明瞭さ: おおむね明確
活発さ: 静か
技術スタック: java
領域: backend, data-engineering

調査の方向性

まず、Java 21 で Arrow Flight サーバーを起動する際の失敗を再現し、次にスタックトレースで特定されている PooledByteBufAllocatorL と NettyAllocationManager を調査します。関連するアクセス動作を Java 17 と比較します。IllegalAccessError が発生しなくなり、サーバーが正常に起動すれば完了です。

索引モデルが issue の本文から書いたものです。

説明

Type: bug

Describe the bug, including details regarding any error messages, version, and platform.

When trying to start an Arrow Flight server use is made of class io.netty.buffer.PoolArena in netty-buffer that is no longer accessible in java 21 from class io.netty.buffer.PooledByteBufAllocatorL in arrow-memory-netty-buffer-patch-19.0.0.jar.
I think this might be caused by Java 21 being more restrictive than 17.

Stack trace

```java Exception in thread "main" java.lang.IllegalAccessError: failed to access class io.netty.buffer.PoolArena from class io.netty.buffer.PooledByteBufAllocatorL$InnerAllocator (io.netty.buffer.PoolArena is in unnamed module of loader 'app'; io.netty.buffer.PooledByteBufAllocatorL$InnerAllocator is in unnamed module of loader org.apache.hop.core.plugins.HopURLClassLoader @26612078) at io.netty.buffer.PooledByteBufAllocatorL$InnerAllocator.(PooledByteBufAllocatorL.java:141) at io.netty.buffer.PooledByteBufAllocatorL.(PooledByteBufAllocatorL.java:46) at org.apache.arrow.memory.netty.NettyAllocationManager.(NettyAllocationManager.java:54) at org.apache.arrow.memory.netty.DefaultAllocationManagerFactory.(DefaultAllocationManagerFactory.java:26) at java.base/java.lang.Class.forName0(Native Method) at java.base/java.lang.Class.forName(Class.java:423) at java.base/java.lang.Class.forName(Class.java:414) at org.apache.arrow.memory.DefaultAllocationManagerOption.getFactory(DefaultAllocationManagerOption.java:105) at org.apache.arrow.memory.DefaultAllocationManagerOption.getDefaultAllocationManagerFactory(DefaultAllocationManagerOption.java:92) at org.apache.arrow.memory.BaseAllocator$Config.getAllocationManagerFactory(BaseAllocator.java:826) at org.apache.arrow.memory.ImmutableConfig.access$001(ImmutableConfig.java:20) at org.apache.arrow.memory.ImmutableConfig$InitShim.getAllocationManagerFactory(ImmutableConfig.java:80) at org.apache.arrow.memory.ImmutableConfig.(ImmutableConfig.java:43) at org.apache.arrow.memory.ImmutableConfig$Builder.build(ImmutableConfig.java:492) at org.apache.arrow.memory.BaseAllocator.(BaseAllocator.java:72) at org.apache.hop.arrow.flight.ArrowFlightServer.(ArrowFlightServer.java:59) at org.apache.hop.arrow.command.ArrowCommand.run(ArrowCommand.java:108) at picocli.CommandLine.executeUserObject(CommandLine.java:2045) at picocli.CommandLine.access$1500(CommandLine.java:148) at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2469) at picocli.CommandLine$RunLast.handle(CommandLine.java:2461) at picocli.CommandLine$RunLast.handle(CommandLine.java:2423) at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2277) at picocli.CommandLine$RunLast.execute(CommandLine.java:2425) at picocli.CommandLine.execute(CommandLine.java:2174) at org.apache.hop.hop.Hop.main(Hop.java:131)