Saber quantas sessões existem abertas?

Estou tentando usar esse:

http://hibernateprofiler.com/home

Mas, ao colocar o .jar na pasta lib, da esse erro ao iniciar Tomcat:

SEVERE: Error in dependencyCheck java.io.IOException: invalid header field at java.util.jar.Attributes.read(Unknown Source) at java.util.jar.Manifest.read(Unknown Source) at java.util.jar.JarInputStream.<init>(Unknown Source) at java.util.jar.JarInputStream.<init>(Unknown Source) at org.apache.catalina.util.ExtensionValidator.getManifest(ExtensionValidator.java:378) at org.apache.catalina.util.ExtensionValidator.validateApplication(ExtensionValidator.java:189) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4296) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardHost.start(StandardHost.java:722) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) at org.apache.catalina.core.StandardService.start(StandardService.java:516) at org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at org.apache.catalina.startup.Catalina.start(Catalina.java:593) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

:roll:

Alguém conhece outro profiler para usar com Hibernate??

Consegui obter isso através das estatísticas do Session Factory…