What does The APR based Apache Tomcat Native library was not found mean

Question

I am using Tomcat 7 in Eclipse on Windows  When starting Tomcat  I am getting the following info message      The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java library path   What does this mean and how can I provide the APR library

User · Answer

My problem was in add some library from tomcat to eclipse class path i just going to eclipse click right to project and going to debug configuration -> classpath -> Add External JARs add all jars files from apache-tomcat-7.0.35\bin this was my problem and it's worked for me .

User · Answer

On RHEL Linux just issue   yum install tomcat-native x86 64    Note depending on Your architecture 64bit or 32bit package may have different extension   That is all  After that You will find in the log file next informational message   INFO  APR capabilities  IPv6  true   sendfile  true   accept filters  false   random  true     All operations will be noticeably faster than before

User · Answer

On Mac OS X     brew install tomcat-native    gt  tomcat-native In order for tomcat s APR lifecycle listener to find this library  you ll need to add it to java library path  This can be done by adding this line to  CATALINA HOME bin setenv sh    CATALINA OPTS   CATALINA OPTS -Djava library path  usr local opt tomcat-native lib   If  CATALINA HOME bin setenv sh doesn t exist  create it and make it executable    Then add it to the eclipse s tomcat arguments  double-click Server   Open Launch Configuration   Arguments tab   VM arguments   -Djava library path  usr local opt tomcat-native lib

User · Answer

I just went through this and configured it with the following   Ubuntu 16 04  Tomcat 8 5 9  Apache2 4 25  APR 1 5 2  Tomcat-native 1 2 10  Java 8   These are the steps i used based on the older posts here   Install package  sudo apt-get update sudo apt-get install libtcnative-1   Verify these packages are installed  sudo apt-get install make  sudo apt-get install gcc sudo apt-get install openssl   Install package  sudo apt-get install libssl-dev  Install and compile Apache APR  cd  opt tomcat bin sudo wget http   apache mirror anlx net  apr apr-1 5 2 tar gz sudo tar -xzvf apr-1 5 2 tar gz cd apr-1 5 2 sudo   configure sudo make sudo make install   verify installation  cd  usr local apr lib  ls    you should see the compiled file as  libapr-1 la  Download and install Tomcat Native source package  cd  opt tomcat bin sudo wget https   archive apache org dist tomcat tomcat-connectors native 1 2 10 source tomcat-native-1 2 10-src tar gz sudo tar -xzvf tomcat-native-1 2 10-src tar gz cd tomcat-native-1 2 10-src native   verify JAVA HOME  sudo pico    bashrc export JAVA HOME  usr lib jvm java-8-openjdk-amd64 source    bashrc sudo   configure --with-apr  usr local apr --with-java-home  JAVA HOME sudo make sudo make install   Edit the  opt tomcat bin setenv sh file with following line   sudo pico  opt tomcat bin setenv sh export LD LIBRARY PATH   LD LIBRARY PATH  usr local apr lib    restart tomcat  sudo service tomcat restart

User · Answer

I had the same problem when tom at could not find the class  Try to view other log files  Sometimes No class def found error appears in different log files    tomcat8-stdout tomcat8-stderr localhost

User · Answer

Had this problem as well  If you do have the libraries  but still have this error  it may be a configuration error  Your server xml may be missing the following line     lt Listener className  org apache catalina core AprLifecycleListener  SSLEngine  on    gt     Alternatively  it may be commented out   This  lt Listener gt   like other listeners is a child of the top-level  lt Server gt    Without the  lt Listener gt  line  there s no attempt to load the APR library  so LD LIBRARY PATH and -Djava library path  settings are ignored

User · Answer

Unless you re running a production server  don t worry about this message  This is a library which is used to improve performance  on production systems   From Apache Portable Runtime  APR  based Native library for Tomcat      Tomcat can use the Apache Portable Runtime to provide superior   scalability  performance  and better integration with native server   technologies  The Apache Portable Runtime is a highly portable library   that is at the heart of Apache HTTP Server 2 x  APR has many uses    including access to advanced IO functionality  such as sendfile  epoll   and OpenSSL   OS level functionality  random number generation  system   status  etc   and native process handling  shared memory  NT pipes and   Unix sockets

User · Answer

If you don t have Tomcat Native library install it with      sudo apt-get install libtcnative-1   and if it s still there an old version upgrade it with      sudo apt-get upgrade libtcnative-1

User · Answer

on debian 8 I fix it with installing libapr1-dev   apt-get install libtcnative-1 libapr1-dev

User · Answer

I had this issue upgrading from Java 8 to 11  After adding this dependency  my app launched without issue    lt dependency gt       lt groupId gt org javassist lt  groupId gt       lt artifactId gt javassist lt  artifactId gt       lt version gt 3 25 0-GA lt  version gt   lt  dependency gt

User · Answer

Installation the native library on Ubuntu server with   sudo apt-get install libtcnative-1   If that does not work tomcat-native needs to be installed   Install Oracle java7    sudo add-apt-repository ppa webupd8team java sudo apt-get update sudo apt-get install oracle-java7-installer sudo apt-get install oracle-java7-set-default  Install tomcat apr    wget http   apache mirror anlx net  apr apr-1 5 0 tar gz tar zxvf apr-1 5 0 tar gz rm apr-1 5 0 tar gz cd apr-1 5 0  sudo   configure sudo make sudo make install export LD LIBRARY PATH   LD LIBRARY PATH  usr local apr lib   Install tomcat tomcat-native    wget http   mirrors ukfast co uk sites ftp apache org  tomcat tomcat-connectors native 1 1 29 source tomcat-native-1 1 29-src tar gz tar zxvf tomcat-native-1 1 29-src tar gz rm tomcat-native-1 1 29-src tar gz cd tomcat-native-1 1 29-src jni native JAVA HOME  usr lib jvm java-7-oracle sudo   configure --with-apr  usr local apr --with-java-home  JAVA HOME sudo make sudo make install

User · Answer

It means exactly what it says   The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java library path   The library referred to is bundled into an OS specific dll  tcnative-1 dll  loaded via JNI  It allows tomcat to use OS functionalities not provided in the Java Runtime  such as sendfile  epoll  OpenSSL  system status  etc    Tomcat will run just fine without it  but for some use cases  it will be faster with the native libraries   If you really want it  download the tcnative-1 dll  or libtcnative so for Linux  and put it in the bin folder  and add a system property to the launch configuration of the tomcat server in eclipse    -Djava library path c  dev tomcat bin

[eclipse] What does "The APR based Apache Tomcat Native library was not found" mean?

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