Pariksit-Dogra opened a new issue, #4026:
URL: https://github.com/apache/logging-log4j2/issues/4026
## Description
Essentially, I am trying to test the sending of log messages using Syslog
over TLS protocol. My tests work completely fine with TCP but break for a
number of reasons (since we've upgraded from JDK17 -> 21). The trust store is
being set programmatically along with the 'SSL' protocol. However, I encounter
issues whereby you get NPE's for it being unable to initialise the SSL
Configuration required.
With an SSL block it 'seems' to work, but that hasn't been required before
and as per the log4j docs should still not be required as long as the system
variables for the trustStore etc are being set before any appenders are
created. Would greatly appreciate any assistance on this 🙇 .
## Configuration
**Version:** 2.25.3
**Operating system:** Windows 11
**JDK:** JDK21
## Logs
```
2026-01-20T12:20:03.986235Z pool-2-thread-1 @coroutine#3 ERROR Could not
create plugin of type class
org.apache.logging.log4j.core.appender.SyslogAppender for element Syslog:
java.lang.NullPointerException: Cannot invoke
"org.apache.logging.log4j.core.net.ssl.SslConfiguration.getKeyStoreConfig()"
because "sslConfig" is null
java.lang.NullPointerException: Cannot invoke
"org.apache.logging.log4j.core.net.ssl.SslConfiguration.getKeyStoreConfig()"
because "sslConfig" is null
at
org.apache.logging.log4j.core.net.SslSocketManager.createSslConfigurationId(SslSocketManager.java:252)
at
org.apache.logging.log4j.core.net.SslSocketManager.getSocketManager(SslSocketManager.java:227)
at
org.apache.logging.log4j.core.appender.SocketAppender.createSocketManager(SocketAppender.java:579)
at
org.apache.logging.log4j.core.appender.SyslogAppender$Builder.build(SyslogAppender.java:151)
at
org.apache.logging.log4j.core.appender.SyslogAppender$Builder.build(SyslogAppender.java:49)
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:1206)
at
org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1125)
at
org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1117)
at
org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:715)
at
org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:271)
at
org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:324)
at
org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:697)
at
org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:786)
at
org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:808)
at
org.apache.logging.log4j.core.config.Configurator.reconfigure(Configurator.java:281)
at
io.kotest.core.spec.ListenersKt$functionOverrideCallbacks$1.beforeEach(listeners.kt:41)
at
io.kotest.engine.test.TestExtensions.beforeTestBeforeAnyBeforeContainer-gIAlu-s(TestExtensions.kt:80)
at
io.kotest.engine.test.interceptors.LifecycleInterceptor.intercept(LifecycleInterceptor.kt:47)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.interceptors.TestCaseExtensionInterceptor$intercept$2.invokeSuspend(TestCaseExtensionInterceptor.kt:24)
at
io.kotest.engine.test.interceptors.TestCaseExtensionInterceptor$intercept$2.invoke(TestCaseExtensionInterceptor.kt)
at
io.kotest.engine.test.interceptors.TestCaseExtensionInterceptor$intercept$2.invoke(TestCaseExtensionInterceptor.kt)
at
io.kotest.engine.test.TestExtensions$intercept$execute$1$1$1.invokeSuspend(TestExtensions.kt:143)
at
io.kotest.engine.test.TestExtensions$intercept$execute$1$1$1.invoke(TestExtensions.kt)
at
io.kotest.engine.test.TestExtensions$intercept$execute$1$1$1.invoke(TestExtensions.kt)
at
io.micronaut.test.extensions.kotest5.MicronautKotest5Extension.intercept(MicronautKotest5Extension.kt:42)
at
io.kotest.engine.test.TestExtensions$intercept$execute$1$1.invokeSuspend(TestExtensions.kt:140)
at
io.kotest.engine.test.TestExtensions$intercept$execute$1$1.invoke(TestExtensions.kt)
at
io.kotest.engine.test.TestExtensions$intercept$execute$1$1.invoke(TestExtensions.kt)
at io.kotest.engine.test.TestExtensions.intercept(TestExtensions.kt:148)
at
io.kotest.engine.test.interceptors.TestCaseExtensionInterceptor.intercept(TestCaseExtensionInterceptor.kt:24)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.interceptors.BeforeSpecListenerInterceptor$intercept$runTest$1$4$1.invokeSuspend(BeforeSpecListenerInterceptor.kt:50)
at
io.kotest.engine.test.interceptors.BeforeSpecListenerInterceptor$intercept$runTest$1$4$1.invoke(BeforeSpecListenerInterceptor.kt)
at
io.kotest.engine.test.interceptors.BeforeSpecListenerInterceptor$intercept$runTest$1$4$1.invoke(BeforeSpecListenerInterceptor.kt)
at
io.kotest.engine.test.interceptors.BeforeSpecListenerInterceptor.intercept(BeforeSpecListenerInterceptor.kt:60)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.interceptors.TestEnabledCheckInterceptor.intercept(TestEnabledCheckInterceptor.kt:31)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.interceptors.CoroutineErrorCollectorInterceptor$intercept$3.invokeSuspend(CoroutineErrorCollectorInterceptor.kt:34)
at
io.kotest.engine.test.interceptors.CoroutineErrorCollectorInterceptor$intercept$3.invoke(CoroutineErrorCollectorInterceptor.kt)
at
io.kotest.engine.test.interceptors.CoroutineErrorCollectorInterceptor$intercept$3.invoke(CoroutineErrorCollectorInterceptor.kt)
at
kotlinx.coroutines.intrinsics.UndispatchedKt.startUndspatched(Undispatched.kt:66)
at
kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:43)
at
kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:165)
at kotlinx.coroutines.BuildersKt.withContext(Unknown Source)
at
io.kotest.engine.test.interceptors.CoroutineErrorCollectorInterceptor.intercept(CoroutineErrorCollectorInterceptor.kt:33)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.interceptors.CoroutineDispatcherFactoryInterceptor$intercept$4.invokeSuspend(coroutineDispatcherFactoryInterceptor.kt:57)
at
io.kotest.engine.test.interceptors.CoroutineDispatcherFactoryInterceptor$intercept$4.invoke(coroutineDispatcherFactoryInterceptor.kt)
at
io.kotest.engine.test.interceptors.CoroutineDispatcherFactoryInterceptor$intercept$4.invoke(coroutineDispatcherFactoryInterceptor.kt)
at
io.kotest.engine.concurrency.FixedThreadCoroutineDispatcherFactory$withDispatcher$4.invokeSuspend(FixedThreadCoroutineDispatcherFactory.kt:59)
at
kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
at java.base/java.lang.Thread.run(Unknown Source)
2026-01-20T12:20:03.995535800Z pool-2-thread-1 @coroutine#3 ERROR Unable to
invoke factory method in class
org.apache.logging.log4j.core.appender.SyslogAppender for element Syslog:
java.lang.IllegalStateException: No factory method found for class
org.apache.logging.log4j.core.appender.SyslogAppender
java.lang.IllegalStateException: No factory method found for class
org.apache.logging.log4j.core.appender.SyslogAppender
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:1206)
at
org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1125)
at
org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1117)
at
org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:715)
at
org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:271)
at
org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:324)
at
org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:697)
at
org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:786)
at
org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:808)
at
org.apache.logging.log4j.core.config.Configurator.reconfigure(Configurator.java:281)
at
io.kotest.core.spec.ListenersKt$functionOverrideCallbacks$1.beforeEach(listeners.kt:41)
at
io.kotest.engine.test.TestExtensions.beforeTestBeforeAnyBeforeContainer-gIAlu-s(TestExtensions.kt:80)
at
io.kotest.engine.test.interceptors.LifecycleInterceptor.intercept(LifecycleInterceptor.kt:47)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.interceptors.TestCaseExtensionInterceptor$intercept$2.invokeSuspend(TestCaseExtensionInterceptor.kt:24)
at
io.kotest.engine.test.interceptors.TestCaseExtensionInterceptor$intercept$2.invoke(TestCaseExtensionInterceptor.kt)
at
io.kotest.engine.test.interceptors.TestCaseExtensionInterceptor$intercept$2.invoke(TestCaseExtensionInterceptor.kt)
at
io.kotest.engine.test.TestExtensions$intercept$execute$1$1$1.invokeSuspend(TestExtensions.kt:143)
at
io.kotest.engine.test.TestExtensions$intercept$execute$1$1$1.invoke(TestExtensions.kt)
at
io.kotest.engine.test.TestExtensions$intercept$execute$1$1$1.invoke(TestExtensions.kt)
at
io.micronaut.test.extensions.kotest5.MicronautKotest5Extension.intercept(MicronautKotest5Extension.kt:42)
at
io.kotest.engine.test.TestExtensions$intercept$execute$1$1.invokeSuspend(TestExtensions.kt:140)
at
io.kotest.engine.test.TestExtensions$intercept$execute$1$1.invoke(TestExtensions.kt)
at
io.kotest.engine.test.TestExtensions$intercept$execute$1$1.invoke(TestExtensions.kt)
at io.kotest.engine.test.TestExtensions.intercept(TestExtensions.kt:148)
at
io.kotest.engine.test.interceptors.TestCaseExtensionInterceptor.intercept(TestCaseExtensionInterceptor.kt:24)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.interceptors.BeforeSpecListenerInterceptor$intercept$runTest$1$4$1.invokeSuspend(BeforeSpecListenerInterceptor.kt:50)
at
io.kotest.engine.test.interceptors.BeforeSpecListenerInterceptor$intercept$runTest$1$4$1.invoke(BeforeSpecListenerInterceptor.kt)
at
io.kotest.engine.test.interceptors.BeforeSpecListenerInterceptor$intercept$runTest$1$4$1.invoke(BeforeSpecListenerInterceptor.kt)
at
io.kotest.engine.test.interceptors.BeforeSpecListenerInterceptor.intercept(BeforeSpecListenerInterceptor.kt:60)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.interceptors.TestEnabledCheckInterceptor.intercept(TestEnabledCheckInterceptor.kt:31)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.interceptors.CoroutineErrorCollectorInterceptor$intercept$3.invokeSuspend(CoroutineErrorCollectorInterceptor.kt:34)
at
io.kotest.engine.test.interceptors.CoroutineErrorCollectorInterceptor$intercept$3.invoke(CoroutineErrorCollectorInterceptor.kt)
at
io.kotest.engine.test.interceptors.CoroutineErrorCollectorInterceptor$intercept$3.invoke(CoroutineErrorCollectorInterceptor.kt)
at
kotlinx.coroutines.intrinsics.UndispatchedKt.startUndspatched(Undispatched.kt:66)
at
kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:43)
at
kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:165)
at kotlinx.coroutines.BuildersKt.withContext(Unknown Source)
at
io.kotest.engine.test.interceptors.CoroutineErrorCollectorInterceptor.intercept(CoroutineErrorCollectorInterceptor.kt:33)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
at
io.kotest.engine.test.interceptors.CoroutineDispatcherFactoryInterceptor$intercept$4.invokeSuspend(coroutineDispatcherFactoryInterceptor.kt:57)
at
io.kotest.engine.test.interceptors.CoroutineDispatcherFactoryInterceptor$intercept$4.invoke(coroutineDispatcherFactoryInterceptor.kt)
at
io.kotest.engine.test.interceptors.CoroutineDispatcherFactoryInterceptor$intercept$4.invoke(coroutineDispatcherFactoryInterceptor.kt)
at
io.kotest.engine.concurrency.FixedThreadCoroutineDispatcherFactory$withDispatcher$4.invokeSuspend(FixedThreadCoroutineDispatcherFactory.kt:59)
at
kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
at java.base/java.lang.Thread.run(Unknown Source)
2026-01-20T12:20:04.004096Z pool-2-thread-1 @coroutine#3 ERROR Null object
returned for Syslog in Appenders.
2026-01-20T12:20:04.020423300Z pool-2-thread-1 @coroutine#3 ERROR Unable to
locate appender "LogToSyslog" for logger config "root"
```
## Reproduction
I've converted my kotlin code into a basic JUnit test that aims to send a
log message via TLS through Syslog. Apologies for not providing a comprehensive
test in this case but the kotlin file should have enough to be able to run. You
might just need to setup a basic GenericContainer companion class that uses the
image 'balabit/syslog-ng:4.4.0'.
[minimal
config.xml](https://github.com/user-attachments/files/24737294/minimal.config.xml)
[basic TLS
test.txt](https://github.com/user-attachments/files/24737302/basic.TLS.test.txt)
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