有时我的服务器（Ununtu服务器上的Tomcat 8.5.15）处于死锁状态。我们得到了一个线程转储，结果是
阻止线程的堆栈跟踪：
org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.getArchiveEntries(AbstractSingleArchiveResourceSet.java:63)
org.apache.catalina.webresources.AbstractArchiveResourceSet.getResource(AbstractArchiveResourceSet.java:256)
org.apache.catalina.webresources.StandardRoot.getResourceInternal(StandardRoot.java:281)
org.apache.catalina.webresources.CachedResource.validateResource(CachedResource.java:95)
org.apache.catalina.webresources.Cache.getResource(Cache.java:69)
org.apache.catalina.webresources.StandardRoot.getResource(StandardRoot.java:216)
org.apache.catalina.webresources.StandardRoot.getClassLoaderResource(StandardRoot.java:225)
org.apache.catalina.loader.WebappClassLoaderBase.getResourceAsStream(WebappClassLoaderBase.java:1067)
org.apache.xerces.parsers.SecuritySupport$6.run(Unknown Source)
java.security.AccessController.doPrivileged(Native Method)
org.apache.xerces.parsers.SecuritySupport.getResourceAsStream(Unknown Source)
org.apache.xerces.parsers.ObjectFactory.findJarServiceProvider(Unknown Source)
org.apache.xerces.parsers.ObjectFactory.createObject(Unknown Source)
org.apache.xerces.parsers.ObjectFactory.createObject(Unknown Source)
org.apache.xerces.parsers.DOMParser.(Unknown Source)
org.apache.xerces.parsers.DOMParser.(Unknown Source)
org.apache.xerces.jaxp.DocumentBuilderImpl.(Unknown Source)
org.apache.xerces.jaxp.DocumentBuilderFactoryImpl.newDocumentBuilder(Unknown Source)
问题线程的堆栈跟踪：
java.util.zip.ZipFile.open(Native Method)
java.util.zip.ZipFile.(ZipFile.java:219)
java.util.zip.ZipFile.(ZipFile.java:149)
java.util.jar.JarFile.(JarFile.java:166)
java.util.jar.JarFile.(JarFile.java:103)
org.apache.catalina.webresources.AbstractArchiveResourceSet.openJarFile(AbstractArchiveResourceSet.java:308)
org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.getArchiveEntry(AbstractSingleArchiveResourceSet.java:93)
org.apache.catalina.webresources.AbstractArchiveResourceSet.getResource(AbstractArchiveResourceSet.java:260)
org.apache.catalina.webresources.StandardRoot.getResourceInternal(StandardRoot.java:281)
org.apache.catalina.webresources.CachedResource.validateResource(CachedResource.java:95)
org.apache.catalina.webresources.Cache.getResource(Cache.java:69)
org.apache.catalina.webresources.StandardRoot.getResource(StandardRoot.java:216)
org.apache.catalina.webresources.StandardRoot.getClassLoaderResource(StandardRoot.java:225)
org.apache.catalina.loader.WebappClassLoaderBase.getResourceAsStream(WebappClassLoaderBase.java:1067)
org.apache.xerces.parsers.SecuritySupport$6.run(Unknown Source)
java.security.AccessController.doPrivileged(Native Method)
org.apache.xerces.parsers.SecuritySupport.getResourceAsStream(Unknown Source)
org.apache.xerces.parsers.ObjectFactory.findJarServiceProvider(Unknown Source)
org.apache.xerces.parsers.ObjectFactory.createObject(Unknown Source)
org.apache.xerces.parsers.ObjectFactory.createObject(Unknown Source)
org.apache.xerces.parsers.DOMParser.(Unknown Source)
org.apache.xerces.parsers.DOMParser.(Unknown Source)
org.apache.xerces.jaxp.DocumentBuilderImpl.(Unknown Source)
org.apache.xerces.jaxp.DocumentBuilderFactoryImpl.newDocumentBuilder(Unknown Source)
同时，OS中打开文件的数量甚至不接近最大值。 任何想法如何解决它？