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?
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
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).
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.
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
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
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:
<Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />
(Alternatively, it may be commented out). This <Listener>, like other listeners is a child of the top-level <Server>.
Without the <Listener> line, there's no attempt to load the APR library, so LD_LIBRARY_PATH and -Djava.library.path= settings are ignored.
on debian 8 I fix it with installing libapr1-dev:
apt-get install libtcnative-1 libapr1-dev
I had the same problem when tomсat 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
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
I had this issue upgrading from Java 8 to 11. After adding this dependency, my app launched without issue:
<dependency>
<groupId>org.javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.25.0-GA</version>
</dependency>
来源：https://stackoverflow.com/questions/8716259/what-does-the-apr-based-apache-tomcat-native-library-was-not-found-mean