java.lang.ClassNotFoundException sun.misc.GC

java eclipse tomcat8 java-10 ubuntu-18.04
user9373603 picture user9373603 · Jun 28, 2018 · Viewed 9.4k times · Source

Version Java: 10.0.1 Tomcat: 8.0.36 Ubuntu: 18.04 (64 bit) Eclipse: Photon (64 bit)

Error: When I run the Tomcat server, I found below error. Please don't tell me to decrease the version if possible, because I love to use latest technology.

    SEVERE: Failed to trigger creation of the GC Daemon thread during Tomcat start to prevent possible memory leaks. This is expected on non-Sun JVMs.
java.lang.ClassNotFoundException: sun.misc.GC
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:466)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:566)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:291)
at org.apache.catalina.core.JreMemoryLeakPreventionListener.lifecycleEvent(JreMemoryLeakPreventionListener.java:286)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:95)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:394)
at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:99)
at org.apache.catalina.startup.Catalina.load(Catalina.java:580)
at org.apache.catalina.startup.Catalina.load(Catalina.java:603)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:310)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:484)

Answer

Michael Berry picture Michael Berry · Jun 28, 2018

Tomcat 8 references sun.misc.GC, which was removed in Java 9 - hence you get the error.

Please don't tell me to decrease the version if possible, because I love to use latest technology.

I'll tell you to do the opposite then! You should be using Tomcat 9, not Tomcat 8. The error should then disappear.

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