tomcat7报错疑问

诸位看看这个是啥个意思？
`he APR based Apache Tomcat Native library which allows optimal performance in
production environments was not found on the java.library.path: /usr/java/jdk1.6.0_32/jre/
lib/amd64/server:/usr/java/jdk1.6.0_32/jre/lib/amd64:/usr/java/jdk1.6.0_32/jre/../lib/amd64:
/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib`
严重:
The web application [] appears to have started a thread named [Thread-4] but has failed to stop it. This is very likely to create a memory leak.
这个是不是很严重?