Exception: AtomicBuffer is not correctly aligned

[appreciated]

We are hitting this issue on every startup.

I think this might be related with us using a x86 JVM with Java 17.

Stacktrace

ERROR StatusConsoleListener Could not create plugin of type class pl.tkowalcz.tjahzi.log4j2.LokiAppender for element Loki: java.lang.IllegalStateException: AtomicBuffer is not correctly aligned: addressOffset=12 is not divisible by 8
 java.lang.IllegalStateException: AtomicBuffer is not correctly aligned: addressOffset=12 is not divisible by 8
	at org.agrona.concurrent.UnsafeBuffer.verifyAlignment(UnsafeBuffer.java:388)
	at org.agrona.concurrent.errors.DistinctErrorLog.<init>(DistinctErrorLog.java:124)
	at org.agrona.concurrent.errors.DistinctErrorLog.<init>(DistinctErrorLog.java:112)
	at pl.tkowalcz.tjahzi.stats.StandardMonitoringModule.<init>(StandardMonitoringModule.java:33)
	at pl.tkowalcz.tjahzi.log4j2.LokiAppenderBuilder.build(LokiAppenderBuilder.java:125)
	at pl.tkowalcz.tjahzi.log4j2.LokiAppenderBuilder.build(LokiAppenderBuilder.java:30)
	at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:124)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:1162)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1083)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1075)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:679)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:264)
	at org.apache.logging.log4j.core.config.builder.impl.DefaultConfigurationBuilder.build(DefaultConfigurationBuilder.java:227)
	at org.apache.logging.log4j.core.config.builder.impl.DefaultConfigurationBuilder.build(DefaultConfigurationBuilder.java:183)
	at org.apache.logging.log4j.core.config.builder.impl.DefaultConfigurationBuilder.build(DefaultConfigurationBuilder.java:69)
	at d.p.o.core.utils.LokiAppenderUtils.initLokiAppender(LokiAppenderUtils.java:72)
	at d.p.o.core.utils.LoggingUtils.configureLogger(LoggingUtils.java:68)
	at d.p.o.localRunner.Start.configureLogger(Start.java:113)
	at d.p.o.localRunner.Start.main(Start.java:35)
ERROR StatusConsoleListener Unable to invoke factory method in class pl.tkowalcz.tjahzi.log4j2.LokiAppender for element Loki: java.lang.IllegalStateException: No factory method found for class pl.tkowalcz.tjahzi.log4j2.LokiAppender
 java.lang.IllegalStateException: No factory method found for class pl.tkowalcz.tjahzi.log4j2.LokiAppender
	at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.findFactoryMethod(PluginBuilder.java:268)
	at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:140)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:1162)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1083)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1075)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:679)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:264)
	at org.apache.logging.log4j.core.config.builder.impl.DefaultConfigurationBuilder.build(DefaultConfigurationBuilder.java:227)
	at org.apache.logging.log4j.core.config.builder.impl.DefaultConfigurationBuilder.build(DefaultConfigurationBuilder.java:183)
	at org.apache.logging.log4j.core.config.builder.impl.DefaultConfigurationBuilder.build(DefaultConfigurationBuilder.java:69)
	at d.p.o.core.utils.LokiAppenderUtils.initLokiAppender(LokiAppenderUtils.java:72)
	at d.p.o.core.utils.LoggingUtils.configureLogger(LoggingUtils.java:68)
	at d.p.o.localRunner.Start.configureLogger(Start.java:113)
	at d.p.o.localRunner.Start.main(Start.java:35)

Debugger Screenshots

StandardMonitoringModule

UnsafeBuffer

[tkowalcz]

Can you tell me which exactly java version are you using? I'll try to reproduce it on some VM in the evening (after work).

[appreciated]

@tkowalcz Thank you so much! This is the one:
https://adoptium.net/de/temurin/releases/?version=17&package=jdk&arch=x86

[appreciated]

Here the same Debugger values with a x64 JVM:

Debugger Screenshot

UnsafeBuffer

[appreciated]

You should be able to fix this issue by replacing the attribute StandardMonitoringModule.ERROR_LOG_CAPACITY with the following code:

int ERROR_LOG_CAPACITY = UNSAFE.arrayBaseOffset(byte[].class) * 64;

This would result on:

• 64-Bit Systems in the current value of 1024
• 32-Bit systems in 768
  These sizes values should work both the UnsafeBuffer.

But I'm not sure if the lower value contradicts with other actual requirements you have with the UnsafeBuffer.
Another, more regression safe solution may be to use a size that that is divisible by 12 and 16 f.e. 1152

[appreciated]

Fixed by upgrading to new Version:

<dependency>
    <groupId>pl.tkowalcz.tjahzi</groupId>
    <artifactId>log4j2-appender</artifactId>
    <version>0.9.32</version>
</dependency>

[tkowalcz]

Ha! Didn't think of that :) I know I fixed similar error but thought this is yet another x86 issue. Glad you worked it out.