1、使用命令：top 查看当前进程的状态

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2、从上图可以看到PID：916的java进程占用内存较大。定位线程问题（通过命令查看PID 为25894 进程的线程情况）,命令：# ps p 916 -L -o pcpu,pmem,pid,tid,time,tname,cmd

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由此可以看到这PID：916的进程产生了很多线程。接下来就可以通过jstack查看内存使用的堆栈。
3、查看内存使用的堆栈：在这里我们挑选了TID=934的线程进行分析，首先需要将934这个id转换为16进制。需输入如下命令，
printf "%x\n" 9731

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4、将PID为916的堆栈信息打印到jstack.log中，命令：jstack -l 916 > jstack.log

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5、
查看堆栈信息文件，命令：vim jstack.log
在进行搜索TID为2603的相关信息。如图：

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6、分析
可以看到这个线程状态为：RUNNABLE。是正在运行状态的
另外其它的大部分线程状态为：WAITING。通过查看文件分析 看到大量 Java Thread State。
说明它在等待另一个条件的发生，来把自己唤醒，或者干脆它是调用了 sleep(N)。
此时线程状态大致为以下几种：
java.lang.Thread.State: WAITING (parking)：一直等那个条件发生；
java.lang.Thread.State: TIMED_WAITING (parking或sleeping)：定时的，那个条件不到来，也将定时唤醒自己。

7.代码优化：将文件发送给开发。优化下线程
B:可能是其他原因导致的问题：
1、使用ps命令:ps -ef | grep java | grep -v grep
查看当前java进程列表

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root83410 May13 ?00:30:09 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start root129413 May13 ?14:41:25 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start root208510 Mar05 ?01:57:08 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start root1280810 Mar08 ?01:16:03 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start root1939210 May09 ?00:36:19 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start root1983811 May09 ?05:32:17 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start root2154310 May27 ?00:22:03 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start root2275015 May27 ?02:28:41 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start

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由上图所示，可以看到java进程是Tomcat的启动进程，开启多个Tomcat启动进程，并且是同一个端口。由此，可以判断，是因为关闭Tomcat服务时，java进程没有自动关闭，导致内存没有释放。
2、使用lsof命令:lsof | grep java |grep -v grep
查看当前进程的运行状态

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java834rootcwdDIR252,14096393217 /root java834rootrtdDIR252,140962 / java834roottxtREG252,15128917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java java834rootmemREG252,1262896269147 /usr/lib64/libjpeg.so.62.0.0 java834rootmemREG252,141400792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so java834rootmemREG252,1644072266782 /usr/lib64/libfreetype.so.6.3.22 java834rootmemREG252,1349032792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so java834rootmemREG252,129072792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so java834rootmemREG252,1715224792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so java834rootmemREG252,199174448269459 /usr/lib/locale/locale-archive java834rootmemREG252,1111440656920 /lib64/libresolv-2.12.so java834rootmemREG252,127896655389 /lib64/libnss_dns-2.12.so .................... java1294rootcwdDIR252,14096393217 /root java1294rootrtdDIR252,140962 / java1294roottxtREG252,15128917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java java1294rootmemREG252,199174448269459 /usr/lib/locale/locale-archive java1294rootmemREG252,1262896269147 /usr/lib64/libjpeg.so.62.0.0 java1294rootmemREG252,141400792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so java1294rootmemREG252,1644072266782 /usr/lib64/libfreetype.so.6.3.22 java1294rootmemREG252,1349032792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so java1294rootmemREG252,129072792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so java1294rootmemREG252,1715224792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so java1294rootmemREG252,1111440656920 /lib64/libresolv-2.12.so java1294rootmemREG252,127896655389 /lib64/libnss_dns-2.12.so java1294rootmemREG252,111920131997 /var/cache/fontconfig/beeeeb3dfe132a8a0633a017c99ce0c0-le64.cache-3 java1294rootmemREG252,13203275792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar java1294rootmemREG252,13509512792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar java1294rootmemREG252,1477712655369 /lib64/libfreeblpriv3.so java1294rootmemREG252,1248720655363 /lib64/libnspr4.so java1294rootmemREG252,118720655370 /lib64/libplc4.so java1294rootmemREG252,114528655377 /lib64/libplds4.so java1294rootmemREG252,1191928266783 /usr/lib64/libnssutil3.so java1294rootmemREG252,11337168268947 /usr/lib64/libnss3.so ............ java2085rootcwdDIR252,1740962621998 /data/apache-tomcat-9.0.13/bin java2085rootrtdDIR252,140962 / java2085roottxtREG252,15128917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java java2085rootmemREG252,199174448269459 /usr/lib/locale/locale-archive java2085rootmemREG252,1111440656920 /lib64/libresolv-2.12.so java2085rootmemREG252,127896655389 /lib64/libnss_dns-2.12.so java2085rootmemREG252,13203275792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar java2085rootmemREG252,13509512792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar java2085rootmemREG252,1477712655369 /lib64/libfreeblpriv3.so java2085rootmemREG252,1248720655363 /lib64/libnspr4.so java2085rootmemREG252,118720655370 /lib64/libplc4.so java2085rootmemREG252,114528655377 /lib64/libplds4.so java2085rootmemREG252,1191928266783 /usr/lib64/libnssutil3.so java2085rootmemREG252,11337168268947 /usr/lib64/libnss3.so java2085rootmemREG252,1185368266802 /usr/lib64/libsmime3.so java2085rootmemREG252,1336472269139 /usr/lib64/libssl3.so java2085rootmemREG252,145720792689 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libsunec.so java2085rootmemREG252,136088792682 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libmanagement.so java2085rootmemREG252,198280792684 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libnet.so java2085rootmemREG252,173416792685 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libnio.so java2085rootmemREG252,17349182622001 /data/apache-tomcat-9.0.13/bin/bootstrap.jar java2085rootmemREG252,173280094792748 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/rt.jar java2085rootmemREG252,1298029792717 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/ext/sunjce_provider.jar ............ java12808rootcwdDIR252,14096393217 /root java12808rootrtdDIR252,140962 / java12808roottxtREG252,15128917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java java12808rootmemREG252,199174448269459 /usr/lib/locale/locale-archive java12808rootmemREG252,1111440656920 /lib64/libresolv-2.12.so java12808rootmemREG252,127896655389 /lib64/libnss_dns-2.12.so java12808rootmemREG252,13509512792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar java12808rootmemREG252,1477712655369 /lib64/libfreeblpriv3.so java12808rootmemREG252,1248720655363 /lib64/libnspr4.so java12808rootmemREG252,118720655370 /lib64/libplc4.so java12808rootmemREG252,13203275792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar java12808rootmemREG252,114528655377 /lib64/libplds4.so java12808rootmemREG252,1191928266783 /usr/lib64/libnssutil3.so java12808rootmemREG252,11337168268947 /usr/lib64/libnss3.so java12808rootmemREG252,1185368266802 /usr/lib64/libsmime3.so java12808rootmemREG252,1336472269139 /usr/lib64/libssl3.so java12808rootmemREG252,145720792689 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libsunec.so java12808rootmemREG252,136088792682 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libmanagement.so java12808rootmemREG252,198280792684 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libnet.so java12808rootmemREG252,173416792685 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libnio.so .......... java19392rootcwdDIR252,14096393217 /root java19392rootrtdDIR252,140962 / java19392roottxtREG252,15128917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java java19392rootmemREG252,1262896269147 /usr/lib64/libjpeg.so.62.0.0 java19392rootmemREG252,141400792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so java19392rootmemREG252,1644072266782 /usr/lib64/libfreetype.so.6.3.22 java19392rootmemREG252,1349032792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so java19392rootmemREG252,129072792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so java19392rootmemREG252,1715224792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so java19392rootmemREG252,199174448269459 /usr/lib/locale/locale-archive java19392rootmemREG252,1111440656920 /lib64/libresolv-2.12.so java19392rootmemREG252,127896655389 /lib64/libnss_dns-2.12.so java19392rootmemREG252,111920131997 /var/cache/fontconfig/beeeeb3dfe132a8a0633a017c99ce0c0-le64.cache-3 java19392rootmemREG252,13203275792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar java19392rootmemREG252,13509512792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar java19392rootmemREG252,1477712655369 /lib64/libfreeblpriv3.so java19392rootmemREG252,1248720655363 /lib64/libnspr4.so java19392rootmemREG252,118720655370 /lib64/libplc4.so java19392rootmemREG252,114528655377 /lib64/libplds4.so java19392rootmemREG252,1191928266783 /usr/lib64/libnssutil3.so ........... java19838rootcwdDIR252,14096393217 /root java19838rootrtdDIR252,140962 / java19838roottxtREG252,15128917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java java19838rootmemREG252,199174448269459 /usr/lib/locale/locale-archive java19838rootmemREG252,1262896269147 /usr/lib64/libjpeg.so.62.0.0 java19838rootmemREG252,141400792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so java19838rootmemREG252,1644072266782 /usr/lib64/libfreetype.so.6.3.22 java19838rootmemREG252,1349032792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so java19838rootmemREG252,129072792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so java19838rootmemREG252,1715224792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so java19838rootmemREG252,111920131997 /var/cache/fontconfig/beeeeb3dfe132a8a0633a017c99ce0c0-le64.cache-3 java19838rootmemREG252,1111440656920 /lib64/libresolv-2.12.so java19838rootmemREG252,127896655389 /lib64/libnss_dns-2.12.so java19838rootmemREG252,13203275792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar java19838rootmemREG252,13509512792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar java19838rootmemREG252,1477712655369 /lib64/libfreeblpriv3.so java19838rootmemREG252,1248720655363 /lib64/libnspr4.so java19838rootmemREG252,118720655370 /lib64/libplc4.so java19838rootmemREG252,114528655377 /lib64/libplds4.so ......... java21543rootcwdDIR252,14096393217 /root java21543rootrtdDIR252,140962 / java21543roottxtREG252,15128917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java java21543rootmemREG252,1262896269147 /usr/lib64/libjpeg.so.62.0.0 java21543rootmemREG252,141400792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so java21543rootmemREG252,1644072266782 /usr/lib64/libfreetype.so.6.3.22 java21543rootmemREG252,1349032792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so java21543rootmemREG252,129072792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so java21543rootmemREG252,1715224792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so java21543rootmemREG252,1111440656920 /lib64/libresolv-2.12.so java21543rootmemREG252,127896655389 /lib64/libnss_dns-2.12.so java21543rootmemREG252,13509512792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar java21543rootmemREG252,13203275792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar java21543rootmemREG252,111920131997 /var/cache/fontconfig/beeeeb3dfe132a8a0633a017c99ce0c0-le64.cache-3 java21543rootmemREG252,1477712655369 /lib64/libfreeblpriv3.so java21543rootmemREG252,1248720655363 /lib64/libnspr4.so java21543rootmemREG252,118720655370 /lib64/libplc4.so java21543rootmemREG252,114528655377 /lib64/libplds4.so java21543rootmemREG252,1191928266783 /usr/lib64/libnssutil3.so ........ java22750rootcwdDIR252,14096393217 /root java22750rootrtdDIR252,140962 / java22750roottxtREG252,15128917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java java22750rootmemREG252,1262896269147 /usr/lib64/libjpeg.so.62.0.0 java22750rootmemREG252,141400792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so java22750rootmemREG252,1644072266782 /usr/lib64/libfreetype.so.6.3.22 java22750rootmemREG252,1349032792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so java22750rootmemREG252,129072792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so java22750rootmemREG252,1715224792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so java22750rootmemREG252,1111440656920 /lib64/libresolv-2.12.so java22750rootmemREG252,127896655389 /lib64/libnss_dns-2.12.so java22750rootmemREG252,111920131997 /var/cache/fontconfig/beeeeb3dfe132a8a0633a017c99ce0c0-le64.cache-3 java22750rootmemREG252,13203275792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar java22750rootmemREG252,13509512792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar java22750rootmemREG252,1477712655369 /lib64/libfreeblpriv3.so java22750rootmemREG252,1248720655363 /lib64/libnspr4.so ........ java29458rootcwdDIR252,14096393217 /root java29458rootrtdDIR252,140962 / java29458roottxtREG252,15128917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java java29458rootmemREG252,199174448269459 /usr/lib/locale/locale-archive java29458rootmemREG252,1262896269147 /usr/lib64/libjpeg.so.62.0.0 java29458rootmemREG252,141400792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so java29458rootmemREG252,1644072266782 /usr/lib64/libfreetype.so.6.3.22 java29458rootmemREG252,1349032792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so java29458rootmemREG252,129072792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so java29458rootmemREG252,1715224792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so java29458rootmemREG252,111920131997 /var/cache/fontconfig/beeeeb3dfe132a8a0633a017c99ce0c0-le64.cache-3 ............ java29458root235uIPv4344899690t0TCP localhost:57037->localhost:mysql (ESTABLISHED) java29458root236uIPv4344899710t0TCP localhost:57036->localhost:mysql (ESTABLISHED) java29458root237uIPv4344899700t0TCP localhost:57040->localhost:mysql (ESTABLISHED) java29458root238uIPv4344899820t0TCP localhost:57042->localhost:mysql (ESTABLISHED) java29458root239uIPv4344899830t0TCP localhost:57043->localhost:mysql (ESTABLISHED) java29458root240uIPv4344899840t0TCP localhost:57046->localhost:mysql (ESTABLISHED)

通过上图所示：正常运行的Tomcat状态应为PID:29458的java进程
3、杀掉其他的java的进程
【java|Java内存过高问题排查】kill -9 PID

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