The APR based Apache Tomcat Native library was not found on the java library path

Question

I m newly at server development and have been started from easy tutorial by  Lars Vogel  Servlet and JSP development with Eclipse WTP    Step by step accord this tutorial      installed Eclipse Java EE Kepler  installed tomcat 7 on Ubuntu 12 04 - http   localhost 8080  shows correct tomcat page  Setting up tomcat runtime environments into eclipse  added tomcat server to eclipse  create DAO  created the Servlet  run      And here I caught next prompt   Sep 15  2013 3 40 39 PM org apache catalina core AprLifecycleListener init INFO  The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java library path   usr java packages lib amd64  usr lib64  lib64  lib  usr lib Sep 15  2013 3 40 42 PM org apache tomcat util digester SetPropertiesRule begin WARNING   SetPropertiesRule  Server Service Engine Host Context  Setting property  source  to  org eclipse jst jee server com filecounter  did not find a matching property  Sep 15  2013 3 40 43 PM org apache coyote AbstractProtocol init INFO  Initializing ProtocolHandler   http-bio-8080   Sep 15  2013 3 40 43 PM org apache coyote AbstractProtocol init INFO  Initializing ProtocolHandler   ajp-bio-8009   Sep 15  2013 3 40 43 PM org apache catalina startup Catalina load INFO  Initialization processed in 5203 ms Sep 15  2013 3 40 43 PM org apache catalina core StandardService startInternal INFO  Starting service Catalina Sep 15  2013 3 40 43 PM org apache catalina core StandardEngine startInternal INFO  Starting Servlet Engine  Apache Tomcat 7 0 42 Sep 15  2013 3 40 45 PM org apache catalina util SessionIdGenerator createSecureRandom INFO  Creation of SecureRandom instance for session ID generation using  SHA1PRNG  took  171  milliseconds  Sep 15  2013 3 40 46 PM org apache coyote AbstractProtocol start INFO  Starting ProtocolHandler   http-bio-8080   Sep 15  2013 3 40 46 PM org apache coyote AbstractProtocol start INFO  Starting ProtocolHandler   ajp-bio-8009   Sep 15  2013 3 40 46 PM org apache catalina startup Catalina start INFO  Server startup in 2882 ms   Here is content of tomcat lib folder   nazar art nazar-desctop  usr local tomcat apache-tomcat-7 0 42 lib  ls -lg total 6132 -rwxrwxrwx 1 nazar art   15264 Jul  2 10 59 annotations-api jar -rwxrwxrwx 1 nazar art   54142 Jul  2 10 59 catalina-ant jar -rwxrwxrwx 1 nazar art  134215 Jul  2 10 59 catalina-ha jar -rwxrwxrwx 1 nazar art 1581311 Jul  2 10 59 catalina jar -rwxrwxrwx 1 nazar art  257520 Jul  2 10 59 catalina-tribes jar -rwxrwxrwx 1 nazar art 1801636 Jul  2 10 59 ecj-4 2 2 jar -rwxrwxrwx 1 nazar art   46085 Jul  2 10 59 el-api jar -rwxrwxrwx 1 nazar art  123241 Jul  2 10 59 jasper-el jar -rwxrwxrwx 1 nazar art  599428 Jul  2 10 59 jasper jar -rwxrwxrwx 1 nazar art   88690 Jul  2 10 59 jsp-api jar -rwxrwxrwx 1 nazar art  177598 Jul  2 10 59 servlet-api jar -rwxrwxrwx 1 nazar art    6873 Jul  2 10 59 tomcat-api jar -rwxrwxrwx 1 nazar art  796527 Jul  2 10 59 tomcat-coyote jar -rwxrwxrwx 1 nazar art  235411 Jul  2 10 59 tomcat-dbcp jar -rwxrwxrwx 1 nazar art   77364 Jul  2 10 59 tomcat-i18n-es jar -rwxrwxrwx 1 nazar art   48693 Jul  2 10 59 tomcat-i18n-fr jar -rwxrwxrwx 1 nazar art   51678 Jul  2 10 59 tomcat-i18n-ja jar -rwxrwxrwx 1 nazar art  124006 Jul  2 10 59 tomcat-jdbc jar -rwxrwxrwx 1 nazar art   23201 Jul  2 10 59 tomcat-util jar   Here is content of catalina 2013-09-15 log     Update   Here is tutorial  Installing Apache Tomcat Native on Linux Ubuntu 12 04  Update2   Here is content of Data Access Object   public class FileDao      public int getCount         int count   0         Load the file with the counter     FileReader fileReader   null      BufferedReader bufferedReader   null      PrintWriter writer   null        try         File f   new File  FileCounter initial          if   f exists              f createNewFile            writer   new PrintWriter new FileWriter f            writer println 0                 if  writer   null           writer close                   fileReader   new FileReader f         bufferedReader   new BufferedReader fileReader         String initial   bufferedReader readLine          count   Integer parseInt initial         catch  Exception ex          if  writer   null           writer close                      if  bufferedReader    null          try           bufferedReader close            catch  IOException e            e printStackTrace                      return count         public void save int count  throws Exception       FileWriter fileWriter   null      PrintWriter printWriter   null      fileWriter   new FileWriter  FileCounter initial        printWriter   new PrintWriter fileWriter       printWriter println count           Make sure to close the file     if  printWriter    null          printWriter close                    And here Servlet code   public class FileCounter extends HttpServlet     private static final long serialVersionUID   1L     int count    private FileDao dao     public void init   throws ServletException       dao   new FileDao        try         count   dao getCount          catch  Exception e          getServletContext   log  An exception occurred in FileCounter   e         throw new ServletException  An exception occurred in FileCounter              e getMessage                  protected void doGet HttpServletRequest request        HttpServletResponse response  throws ServletException  IOException          Set a cookie for the user  so that the counter does not increate        every time the user press refresh     HttpSession session   request getSession true          Set the session valid for 5 secs     session setMaxInactiveInterval 5       response setContentType  text plain        PrintWriter out   response getWriter        if  session isNew            count              out println  This site has been accessed     count     times            public void destroy         super destroy        try         dao save count         catch  Exception e          e printStackTrace                    I haven t had web xml yet   How to solve this trouble

User · Answer

Regarding the original question asked in the title ...

sudo apt-get install libtcnative-1
or if you are on RHEL Linux yum install tomcat-native

The documentation states you need http://tomcat.apache.org/native-doc/

sudo apt-get install libapr1.0-dev libssl-dev
or RHEL yum install apr-devel openssl-devel

User · Answer

not found on the java library path   usr java packages lib amd64  usr lib64  lib64  lib  usr lib    The native lib is expected in one of the following locations   usr java packages lib amd64  usr lib64  lib64  lib  usr lib   and not in   tomcat lib   The files in tomcat lib are all jar file and are added by tomcat to the classpath so that they are available to your application    The native lib is needed by tomcat to perform better on the platform it is installed on and thus cannot be a jar  for linux it could be a  so file  for windows it could be a  dll file   Just download the native library for your platform and place it in the one of the locations tomcat is expecting it to be   Note that you are not required to have this lib for development test purposes  Tomcat runs just fine without it      org apache catalina startup Catalina start INFO  Server startup in 2882 ms   EDIT  The output you are getting is very normal  it s just some logging outputs from tomcat  the line right above indicates that the server correctly started and is ready for operating   If you are troubling with running your servlet then after the run on sever command eclipse opens a browser window  embeded  default  or external  depends on your config   If nothing shows on the browser  then check the url bar of the browser to see whether your servlet was requested or not   It should be something like that  http   localhost 8080  lt your-context-name gt   lt your-servlet-name gt    EDIT 2  Try to call your servlet using the following url   http   localhost 8080 com filecounter FileCounter   Also each web project has a web xml  you can find it in your project under WebContent WEB-INF   It is better to configure your servlets there using servlet-name servlet-class and url-mapping  It could look like that      lt servlet gt       lt description gt  lt  description gt       lt display-name gt File counter - My first servlet lt  display-name gt       lt servlet-name gt file counter lt  servlet-name gt       lt servlet-class gt com filecounter FileCounter lt  servlet-class gt     lt  servlet gt      lt servlet-mapping gt       lt servlet-name gt file counter lt  servlet-name gt       lt url-pattern gt  FileFounter lt  url-pattern gt     lt  servlet-mapping gt    In eclipse dynamic web project the default context name is the same as your project name   http   localhost 8080  lt your-context-name gt  FileCounter   will work too

[java] The APR based Apache Tomcat Native library was not found on the java.library.path

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