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Manual Setup of Java Web

Last updated: 2022-03-21 15:19:40

    Introduction

    This article describes how to set up a Java Web environment on a Linux CVM.

    This requires you to be familiar with common Linux commands, such as Installing Software via YUM in a CentOS Environment, and understand the versions of the installed software.

    Software

    These are the software involved:

    • CentOS is a distribution of the Linux operating system. We use CentOS 7.6 in this article.
    • Apache Tomcat provides a "pure Java" HTTP web server environment in which Java code can run. We use Apache Tomcat 8.5.47.
    • JDK, or Java Development Kit, is an implementation of the Java Platform. We use JDK 1.8.0_221 in this article.

    Prerequisites

    Setting up a Java Web environment requires a Linux CVM. If you have not purchased one yet, see Getting Started with Linux CVMs.

    Directions

    Step 1: Logging in to a Linux instance

    Step 2: Installing JDK

    1. Download the JDK installation file. Go to the Java SE download page to select a version and download it.

      Download the JDK file, save it locally, and upload it to your CVM. Otherwise, decompressing the file will result in errors.

      • If you are using Windows, use WinSCP to upload the file.
      • If you are using MacOS or Linux, use SCP to upload the file.
    2. Run the following command to create a directory for JDK installation.

      mkdir /usr/java
      
    3. Run the following command to decompress JDK to the directory.

      tar xzf jdk-8u221-linux-x64.tar.gz -C /usr/java
      
    4. Run the following command to open profile.

      vim /etc/profile
      
    5. Press i to enter edit mode. Start a new line after export PATH USER ... and add the following:

      export JAVA_HOME=/usr/java/jdk1.8.0_221 (replace 1.8.0_221 with your JDK version number)
      export CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib
      export PATH=$JAVA_HOME/bin:$PATH
      

    The result should be as follows:

    6. Press Esc and input :wq to save the file and go back.
    7. Run the following command to read system environment variables.

    source /etc/profile
    
    1. Run the following command to check if JDK is installed properly.
      java -version
      

    If the following appears, the installation was successful.

    Step 3: Installing Tomcat

    1. Run the following command to download Tomcat source codes. Select a version that suits you.

      Refer to the Apache Tomcat official website for more information.

      wget http://mirrors.tuna.tsinghua.edu.cn/apache/tomcat/tomcat-8/v8.5.47/bin/apache-tomcat-8.5.47.tar.gz
      
    2. Run the following command to decompress the file.

      tar xzf apache-tomcat-8.5.47.tar.gz
      
    3. Run the following command to move the directory that contains Tomcat to /usr/local/tomcat/.

      mv apache-tomcat-8.5.47 /usr/local/tomcat/
      
    4. Run the following command to open server.xml.

      vim /usr/local/tomcat/conf/server.xml
      
    5. Find <host …="" appbase="webapps”> and press i to enter edit mode. Replace appBase=" webapps"="" with="" the="" following:="" <dx-code-holder="" data-codeindex="10">

    6. Press Esc and input :wq to save the file and go back.

    7. Run the following command to create a file named setenv.sh.

      appBase="/usr/local/tomcat/webapps"
      
    8. Press Enter to enter edit mode and input the following to set JVM memory variables.

      vi /usr/local/tomcat/bin/setenv.sh
      
    9. Press Esc and input :wq to save the file and go back.

    10. Run the following command to start Tomcat.

      JAVA_OPTS='-Djava.security.egd=file:/dev/./urandom -server -Xms256m -Xmx496m -Dfile.encoding=UTF-8' 
      

    If the following appears, Tomcat has been successfully started.

    Verifying the Environment Configuration

    1. Run the following command to create a test file.

      /usr/local/tomcat/bin/startup.sh
      
    2. Open a browser window on your local machine and visit the following URL to check whether the environment configuration was successful.

      echo Hello World! > /usr/local/tomcat/webapps/ROOT/index.jsp
      

    If the following results appear, the environment configuration was successful.

    FAQ

    If you encounter a problem when using CVM, refer to the following documents for troubleshooting based on your actual situation.

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