PAX523 opened a new issue, #3214:
URL: https://github.com/apache/logging-log4j2/issues/3214
## Description
It occurs depending on the Java version and the used JVM implementation.
We're migrating from Java 8 to Java 17. I cannot reproduce it with Oracle JDK
8, but with OpenJ9 JDK 8. The problem is that there are threads with an empty
stacktrace which is not expected by `ExtendedThreadInformation`.
## Configuration
**Version:** 2.17.2
**Operating system:** N/A
**JDK:** 17.0.3_7_openj9
## Logs
```
java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 0
at
org.apache.logging.log4j.core.message.ExtendedThreadInformation.formatState(ExtendedThreadInformation.java:141)
at
org.apache.logging.log4j.core.message.ExtendedThreadInformation.printThreadInfo(ExtendedThreadInformation.java:44)
at
org.apache.logging.log4j.message.ThreadDumpMessage.formatTo(ThreadDumpMessage.java:98)
at
org.apache.logging.log4j.message.ThreadDumpMessage.getFormattedMessage(ThreadDumpMessage.java:86)
at
de.icongmbh.dopix.logging.log4j.TestLog4jLogManager.dumpAllThreads_loggerIsEnabled_generateLogEvent(TestLog4jLogManager.java:293)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
```
## Reproduction
```
ExtendedLogger loggerLogger = mock(ExtendedLogger.class, "loggerLogger");
when(this.contextResolver.get()).thenReturn(this.context);
when(this.context.getLogger(Log4jLogManager.class.getName())).thenReturn(this.loggerLogger);
when(this.configFactory.create(any(LoggerContext.class))).thenReturn(this.config);
this.subjectUnderTest = new Log4jLogManager(this.contextResolver,
this.configFactory);
verify(this.configFactory, atLeastOnce()).create(this.context);
when(this.context.getLogger(LOGGER_NAME)).thenReturn(this.logger);
when(this.loggerLogger.isEnabled(isA(Level.class),
isA(Marker.class))).thenReturn(true);
assertThat(this.subjectUnderTest.dumpAllThreads(CATEGORIES_MASK)).isTrue();
final ArgumentCaptor<Message> message =
ArgumentCaptor.forClass(Message.class);
verify(this.loggerLogger).logMessage(eq(RESULTING_LEVEL),
eq(RESULTING_MARKER),
eq(Log4jLogManager.FQCN),
any(StackTraceElement.class),
message.capture(),
ArgumentMatchers.<Throwable>
isNull());
assertThat(message.getValue().getFormattedMessage()).contains(Thread.currentThread().getName());
```
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