NullPointerException from FStringEqual.hashCode #6039
Description
Environment
Java web application using jruby-complete as jar file in war's WEB-INF/lib and using embedded jruby mode
- Windows 10
- Apache Tomcat/8.5.35
- Java version:
openjdk 13.0.1 2019-10-15
OpenJDK Runtime Environment AdoptOpenJDK (build 13.0.1+9)
Eclipse OpenJ9 VM AdoptOpenJDK (build openj9-0.17.0, JRE 13 Windows 10 amd64-64-Bit Compressed References 20191031_97 (JIT enabled, AOT enabled)
OpenJ9 - 77c1cf708
OMR - 20db4fbc
JCL - c973c65658 based on jdk-13.0.1+9)
Provide at least:
- JRuby version : 9.2.9.0 as obtained from here https://mvnrepository.com/artifact/org.jruby/jruby-complete/9.2.9.0 ( JRUBY_OPTS = -J-XX:+CMSClassUnloadingEnabled -J-XX:+UseConcMarkSweepGC -J-XX:PermSize=500m -J-XX:MaxPermSize=1024m -J-Xmx1g -J-Djruby.objectspace.enabled=false)
- Operating system and platform : Windows 10
Other relevant info you may wish to add:
- During Tomcat server stop using Ctrl+C to stop it Tomcat dump exception from thread leaks detector
Expected Behavior
- No NullPointerException to occur
Actual Behavior
- NullPointerException occur during Tomcat stop using Ctrl+C:
Stacktrace:
2020-01-15 11:15:05.598 WARNING [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks Unable to determine string representation of value of type [org.jruby.Ruby.FStringEqual]
java.lang.NullPointerException
at org.jruby.Ruby$FStringEqual.hashCode(Ruby.java:4860)
at java.base/java.lang.Object.toString(Object.java:164)
at org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks(WebappClassLoaderBase.java:1981)
at org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalsForLeaks(WebappClassLoaderBase.java:1907)
at org.apache.catalina.loader.WebappClassLoaderBase.clearReferences(WebappClassLoaderBase.java:1577)
at org.apache.catalina.loader.WebappClassLoaderBase.stop(WebappClassLoaderBase.java:1518)
at org.apache.catalina.loader.WebappLoader.stopInternal(WebappLoader.java:446)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:226)
at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5514)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:226)
at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1439)
at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1428)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:831)