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Posted to issues@arrow.apache.org by "mattcasters (via GitHub)" <gi...@apache.org> on 2026/04/06 14:27:23 UTC
[I] Java 21 breaks access to netty-buffer class [arrow-java]
mattcasters opened a new issue, #1106:
URL: https://github.com/apache/arrow-java/issues/1106
### 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.
<details>
<summary>Stack trace</summary>
```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$InnerAllocator.<init>(PooledByteBufAllocatorL.java:141)
at io.netty.buffer.PooledByteBufAllocatorL.<init>(PooledByteBufAllocatorL.java:46)
at org.apache.arrow.memory.netty.NettyAllocationManager.<clinit>(NettyAllocationManager.java:54)
at org.apache.arrow.memory.netty.DefaultAllocationManagerFactory.<clinit>(DefaultAllocationManagerFactory.java:26)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:423)
at java.base/java.lang.Class.forName(Class.java:414)
at org.apache.arrow.memory.DefaultAllocationManagerOption.getFactory(DefaultAllocationManagerOption.java:105)
at org.apache.arrow.memory.DefaultAllocationManagerOption.getDefaultAllocationManagerFactory(DefaultAllocationManagerOption.java:92)
at org.apache.arrow.memory.BaseAllocator$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.<init>(ImmutableConfig.java:43)
at org.apache.arrow.memory.ImmutableConfig$Builder.build(ImmutableConfig.java:492)
at org.apache.arrow.memory.BaseAllocator.<clinit>(BaseAllocator.java:72)
at org.apache.hop.arrow.flight.ArrowFlightServer.<init>(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)
```
</details>
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Re: [I] Java 21 breaks access to netty-buffer class [arrow-java]
Posted by "mattcasters (via GitHub)" <gi...@apache.org>.
mattcasters commented on issue #1106:
URL: https://github.com/apache/arrow-java/issues/1106#issuecomment-4196862286
For now I solved the problem by duplicating the JAR files into the plugin classpath so that the separation isn't showing up.
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