tomcat

Exception in thread "main" java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start0(Native Method)
        at java.lang.Thread.start(Thread.java:717)
        at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:957)
        at java.util.concurrent.ThreadPoolExecutor.prestartAllCoreThreads(ThreadPoolExecutor.java:1617)
        at org.apache.tomcat.util.threads.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:78)
        at org.apache.tomcat.util.net.AbstractEndpoint.createExecutor(AbstractEndpoint.java:535)
        at org.apache.tomcat.util.net.JIoEndpoint.startInternal(JIoEndpoint.java:430)
        at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:735)
        at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:467)
        at org.apache.catalina.connector.Connector.startInternal(Connector.java:1007)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
        at org.apache.catalina.core.StandardService.startInternal(StandardService.java:460)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
        at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:758)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:693)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:428)