tomcat 7 ubuntu

root@ubuntu:/etc/init.d# apt-get install tomcat7*
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
 libservlet3.0-java libtomcat7-java tomcat7-common
Suggested packages:
 tomcat7-user libtcnative-1
The following packages will be upgraded:
 libservlet3.0-java libtomcat7-java tomcat7 tomcat7-common
4 upgraded, 0 newly installed, 0 to remove and 132 not upgraded.
Need to get 3,998 kB of archives.
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Do you want to continue? [Y/n] y
Get:1 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main libservlet3.0-java all 7.0
.56-2ubuntu0.1 [303 kB]
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Get:4 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main tomcat7 all 7.0.56-2ubuntu
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Preconfiguring packages ...
(Reading database ... 145576 files and directories currently installed.)
Preparing to unpack .../libservlet3.0-java_7.0.56-2ubuntu0.1_all.deb ...
Unpacking libservlet3.0-java (7.0.56-2ubuntu0.1) over (7.0.56-2) ...
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Processing triggers for ureadahead (0.100.0-19) ...
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Setting up libservlet3.0-java (7.0.56-2ubuntu0.1) ...
Setting up libtomcat7-java (7.0.56-2ubuntu0.1) ...
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Setting up tomcat7 (7.0.56-2ubuntu0.1) ...
root@ubuntu:/etc/init.d#

root@ubuntu:/etc/init.d# apt-get install tomcat7-docs tomcat7-examples            
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be upgraded:
 tomcat7-docs tomcat7-examples
2 upgraded, 0 newly installed, 0 to remove and 129 not upgraded.
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buntu0.1 [556 kB]
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dpkg -l | grep tomcat

ii  libtomcat7-java                               7.0.56-2ubuntu0.1                          all          Servlet and JSP engine -- core libraries

ii  tomcat7                                       7.0.56-2ubuntu0.1                          all          Servlet and JSP engine

ii  tomcat7-admin                                 7.0.56-2ubuntu0.1                          all          Servlet and JSP engine -- admin web applications

ii  tomcat7-common                                7.0.56-2ubuntu0.1                          all          Servlet and JSP engine -- common files

ii  tomcat7-docs                                  7.0.56-2ubuntu0.1                          all          Servlet and JSP engine -- documentation

ii  tomcat7-examples                              7.0.56-2ubuntu0.1                          all          Servlet and JSP engi

root@ubuntu:/etc/init.d#  apt-get install libapache2-mod-jk  

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Suggested packages:
 libapache-mod-jk-doc tomcat8
The following NEW packages will be installed:
 libapache2-mod-jk
0 upgraded, 1 newly installed, 0 to remove and 129 not upgraded.
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Selecting previously unselected package libapache2-mod-jk.
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Preparing to unpack .../libapache2-mod-jk_1%3a1.2.37-4+deb8u1build0.15.04.1_amd64.deb ..
.
Unpacking libapache2-mod-jk (1:1.2.37-4+deb8u1build0.15.04.1) ...
Setting up libapache2-mod-jk (1:1.2.37-4+deb8u1build0.15.04.1) ...
apache2_invoke: Enable module jk

create a webapp

root@ubuntu:/etc/init.d# cd /var/lib/tomcat7/webapps

root@ubuntu:/var/lib/tomcat7/webapps# mkdir tomcat-demo

root@ubuntu:/var/lib/tomcat7/webapps# mkdir tomcat-demo/helloworld

root@ubuntu:/var/lib/tomcat7/webapps# vim tomcat-demo/helloworld/index.jsp  

<HTML>

 <HEAD>

  <TITLE>Hello World</TITLE>

 </HEAD>

 <BODY>

  <H1>Hello World</H1>

  Today is: <%= new java.util.Date().toString() %>

 </BODY>

</HTML>

root@ubuntu:/etc/init.d# vim /etc/tomcat7/server.xml  

<Connector port="8009"protocol="AJP/1.3"redirectPort="8443"/>

root@ubuntu:/etc/init.d# vim /etc/apache2/workers.properties

# Define 1 real worker using ajp13

worker.list=worker1

# Set properties for worker (ajp13)

worker.worker1.type=ajp13

worker.worker1.host=localhost

worker.worker1.port=8009

 root@ubuntu:/usr/share/tomcat7/bin# vi /etc/apache2/mods-enabled/jk.conf

root@ubuntu:/etc/init.d# vim /etc/apache2/mods-available/jk.conf

  JkWorkersFile /etc/apache2/workers.properties

root@ubuntu:/usr/share/tomcat7/bin# vi /etc/apache2/mods-enabled/jk.load

root@ubuntu:/etc/init.d# vim /etc/apache2/mods-available/jk.load

LoadModule jk_module /usr/lib/apache2/modules/mod_jk.so

root@ubuntu:/etc/init.d# vi /etc/apache2/sites-enabled/000-default.conf

JkMount /tomcat-demo* worker1

root@ubuntu:/var/lib/tomcat7/webapps# service apache2 restart
root@ubuntu:/var/lib/tomcat7/webapps# service tomcat7 restart

vi /etc/tomcat7/tomcat-users.xml  

<role rolename="admin"/>
 <role rolename="admin-gui"/>
 <role rolename="admin-script"/>
 <role rolename="manager"/>
 <role rolename="manager-gui"/>
 <role rolename="manager-script"/>
 <role rolename="manager-jmx"/>
 <role rolename="manager-status"/>
 <user name="admin" password="admin" roles="admin,manager,admin-

gui,admin-script,manager-gui,manager-script,manager-jmx,manager-status”/>

root@ubuntu:/etc/init.d# ./tomcat7 restart  

                            
[ ok ] Restarting tomcat7 (via systemctl): tomcat7.service.

JAVA parameters

root@ubuntu:/usr/share/tomcat7/bin# vi /usr/share/tomcat7/bin/catalina.sh

root@ubuntu:/usr/share/tomcat7/bin# vi catalina.sh

export JAVA_OPTS="-Xms512m -Xmx1024m"

 export CATALINA_OPTS="-Xms512m -Xmx1024m"

root@ubuntu:/usr/share/tomcat7/bin# chmod a+x setenv.sh

setenv.sh

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export CATALINA_OPTS="$CATALINA_OPTS -Xms512m"

export CATALINA_OPTS="$CATALINA_OPTS -Xmx8192m"

export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxPermSize=256m"

root@ubuntu:/usr/share/tomcat7/bin# ./catalina.sh run

Using CATALINA_BASE:   /usr/share/tomcat7

Using CATALINA_HOME:   /usr/share/tomcat7

Using CATALINA_TMPDIR: /usr/share/tomcat7/temp

Using JRE_HOME:        /usr

Using CLASSPATH:       /usr/share/tomcat7/bin/bootstrap.jar:/usr/share/tomcat7/bin/tomcat-juli.jar

Nov 08, 2015 5:01:34 PM org.apache.catalina.startup.ClassLoaderFactory validateFile

WARNING: Problem with directory [/usr/share/tomcat7/common/classes], exists: [false], isDirectory: [false], canRead: [false]

Nov 08, 2015 5:01:34 PM org.apache.catalina.startup.ClassLoaderFactory validateFile

WARNING: Problem with directory [/usr/share/tomcat7/common], exists: [false], isDirectory: [false], canRead: [false]

Nov 08, 2015 5:01:34 PM org.apache.catalina.startup.ClassLoaderFactory validateFile

WARNING: Problem with directory [/usr/share/tomcat7/server/classes], exists: [false], isDirectory: [false], canRead: [false]

Nov 08, 2015 5:01:34 PM org.apache.catalina.startup.ClassLoaderFactory validateFile

WARNING: Problem with directory [/usr/share/tomcat7/server], exists: [false], isDirectory: [false], canRead: [false]

Nov 08, 2015 5:01:34 PM org.apache.catalina.startup.ClassLoaderFactory validateFile

WARNING: Problem with directory [/usr/share/tomcat7/shared/classes], exists: [false], isDirectory: [false], canRead: [false]

Nov 08, 2015 5:01:34 PM org.apache.catalina.startup.ClassLoaderFactory validateFile

WARNING: Problem with directory [/usr/share/tomcat7/shared], exists: [false], isDirectory: [false], canRead: [false]

Nov 08, 2015 5:01:34 PM org.apache.catalina.startup.Catalina initDirs

SEVERE: Cannot find specified temporary folder at /usr/share/tomcat7/temp

Nov 08, 2015 5:01:34 PM org.apache.catalina.startup.Catalina load

WARNING: Unable to load server configuration from [/usr/share/tomcat7/conf/server.xml]

Nov 08, 2015 5:01:34 PM org.apache.catalina.startup.Catalina initDirs

SEVERE: Cannot find specified temporary folder at /usr/share/tomcat7/temp

Nov 08, 2015 5:01:34 PM org.apache.catalina.startup.Catalina load

WARNING: Unable to load server configuration from [/usr/share/tomcat7/conf/server.xml]

Nov 08, 2015 5:01:34 PM org.apache.catalina.startup.Catalina start

SEVERE: Cannot start server. Server instance is not configured.

root@ubuntu:/usr/share/tomcat7/bin# /etc/init.d/tomcat7 restart

[ ok ] Restarting tomcat7 (via systemctl): tomcat7.service.

root@ubuntu:/usr/share/tomcat7/bin# tail /var/log/tomcat7/localhost_access_log.2015-11-08.txt

0:0:0:0:0:0:0:1 - - [08/Nov/2015:13:39:00 +0530] "GET / HTTP/1.1" 304 -

0:0:0:0:0:0:0:1 - - [08/Nov/2015:13:39:00 +0530] "GET /favicon.ico HTTP/1.1" 404 991

0:0:0:0:0:0:0:1 - - [08/Nov/2015:13:46:51 +0530] "GET /manager/html?org.apache.catalina.filters.CSRF_NONCE=5B6F7EF172D4AA721C510241F2B89ECD HTTP/1.1" 401 2474

0:0:0:0:0:0:0:1 - admin [08/Nov/2015:13:46:53 +0530] "GET /manager/html?org.apache.catalina.filters.CSRF_NONCE=5B6F7EF172D4AA721C510241F2B89ECD HTTP/1.1" 200 17581

root@ubuntu:/usr/share/tomcat7/bin# ps aux | grep java

tomcat7    4107  1.7  5.4 9378560 219708 ?      Sl   17:01   0:05 /usr/lib/jvm/default-java/bin/java -Djava.util.logging.config.file=/var/lib/tomcat7/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Xms512m -Xmx1024m -Xms512m -Xmx1024m -Xms512m -Xmx8192m -XX:MaxPermSize=256m -Djava.endorsed.dirs=/usr/share/tomcat7/endorsed -classpath /usr/share/tomcat7/bin/bootstrap.jar:/usr/share/tomcat7/bin/tomcat-juli.jar -Dcatalina.base=/var/lib/tomcat7 -Dcatalina.home=/usr/share/tomcat7 -Djava.io.tmpdir=/tmp/tomcat7-tomcat7-tmp org.apache.catalina.startup.Bootstrap start

root       4196  0.0  0.0   9492  2276 pts/2    S+   17:06   0:00 grep --color=auto java

root@ubuntu:/usr/share/tomcat7/bin# vi /usr/share/tomcat7/bin/setenv.sh

root@ubuntu:/usr/share/tomcat7/bin#

If you may get an error java.lang.OutOfMemoryError: PermGen space in both windows or linux system,

Configure the MaxPermSize value in  setenv.sh or catalina.sh like,

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export JAVA_OPTS="-Xms256m -Xmx512m -XX:MaxPermSize=128m"

set CATALINA_OPTS=%CATALINA_OPTS% -Djava.library.path=”C:\Program Files\Documentum\shared” -Xms256m -Xmx256m -XX:NewSize=64m -XX:MaxNewSize=64m -XX:SurvivorRatio=14 -verbose:gc

 -Xms Starting heap size (default is 256m)

-Xmx Maximum Heap size (default is 256m)

YoungGen

-XX:NewSize Starting NewSize memory allocation (default is 64)

-XX:MaxNewSize Maximum NewSize allocation (default is 64)

-XX:SurvivorRatio Fraction of NewSize reserved for survivor (not GC) space (default is 14)

ou just need to...

  - add -XX:PermSize and -XX:MaxPermSize to CATALINA_OPTS to configure PermGen to be 512M.

  - add -XX:NewSize and -XX:MaxNewSize to CATALINA_OPTS to configure YoungGen to be 200M.

  - restart your Tomcat instance

 java -Xms128m -Xmx2g MyApp

It is useful to know that both -Xms and -Xmx are only shortcuts which are internally mapped to -XX:InitialHeapSize and -XX:MaxHeapSize. These two XX flags may also be used directly, to the same effect:

java -XX:InitialHeapSize=128m -XX:MaxHeapSize=2g MyApp

 java -XX:PermSize=128m -XX:MaxPermSize=256m MyApp

XX:+UseCodeCacheFlushing

-XX:InitialCodeCacheSize=n Defines the initial size of the Code Cache.

-XX:ReservedCodeCacheSize=n Defines the maximum size of the Code Cache.

-XX:ReservedCodeCacheSize=32m Reserved code cache size (in bytes) - maximum code cache size. [Solaris 64-bit, amd64, and -server x86: 2048m; in 1.5.0_06 and earlier, Solaris 64-bit and and64: 1024m.]

https://developer.opentext.com/webaccess/#url=%2Fawd%2Fresources%2Farticles%2F6123%2Ftomcat%2Bconfiguration%2Bmemory%2B%2Bheap%2Band%2Bpermgen

Java Garbage Collection

In java, garbage means unreferenced objects.

Garbage Collection is process of reclaiming the runtime unused memory automatically. In other words, it is a way to destroy the unused objects.

To do so, we were using free() function in C language and delete() in C++. But, in java it is performed automatically. So, java provides better memory management.

Advantage of Garbage Collection

• It makes java memory efficient because garbage collector removes the unreferenced objects from heap memory.
• It is automatically done by the garbage collector(a part of JVM) so we don't need to make extra efforts.

http://jpbempel.blogspot.in/2012/11/the-usefull-jvm-options.html

GC Settings/Tuning

 For configuring GC, there is tons of options, specially for the CMS ! But at the end few are really usefull. I will not enter into fine tuning of CMS.

-XX:+UseSerialGC Activates classic monothreaded young GC

-XX:+UseParallelGC Activates multi-threaded young GC

-XX:+UseParNewGC Activates another multi-threaded young GC but required for CMS.

-XX:+UseParalelOldGCActivates multi-threaded Old GC.

-XX:+UseConcMarkSweepGCActivates Concurrent GC

-XX:+UseG1GC Activates Garbage First GC

-XX:ParallelGCThreads=n Fixes number of threads for Parallel*GC Usefull for multiple JVM on same machine to avoid GC threads disturb other JVM threads

-XX:CMSInitiatingOccupancyFraction=n Fixes fraction in percentage of the old when CMS start. Usefull when allocation rate is not very predictable.

-XX:+UseCMSInitiatingOccupancyOnly CMS only start based on the previous parameter and not on the internal heuristic.

-XX:+CMSClassUnloadingEnabled Enables to unload classes from PermGen during CMS GC. Otherwise you need to wait the FullGC.