Compiling and Installing Spring Boot

Obtain the Spring-Boot source code.

Go to the home directory on the server.
1

cd /home

Download the Spring-Boot source package.

Spring Boot 2.2.2: https://github.com/spring-projects/spring-boot/archive/v2.2.2.RELEASE.tar.gz
Spring Boot 2.2.6: https://github.com/spring-projects/spring-boot/archive/v2.2.6.RELEASE.tar.gz

Run the following command to download the package. In the command, x.x.x indicates the version number.

          
               wget https://github.com/spring-projects/spring-boot/archive/vx.x.x.RELEASE.tar.gz --no-check-certificate

You can also download the source code using a local browser and upload the source code to the home directory on the server.

Decompress the source package.
1

tar -zxvf vx.x.x.RELEASE.tar.gz

Change the name of the decompressed source package to spring-boot and go to the source code directory.

       
            mv spring-boot-x.x.x.RELEASE spring-boot && cd spring-boot

Switch to the spring-project/spring-boot directory.
1

cd spring-boot-project/spring-boot

Remove the dependency of netty-transport-native-epoll on the x86-64 version, and add the dependency of netty-transport-native-epoll on the AArch64 version.

Open the pom.xml file.
1

vim pom.xml

Press i to enter the insert mode and modify the following content.

Add the following content below line 83:

                  <dependency>
                          <groupId>io.netty</groupId>
                          <artifactId>netty-transport-native-epoll</artifactId>
                          <version>4.1.43.Final</version>
                          <classifier>linux-aarch_64</classifier>
                          <scope>compile</scope>
                          <exclusions>
                                  <exclusion>
                                          <artifactId>commons-logging</artifactId>
                                          <groupId>commons-logging</groupId>
                                  </exclusion>
                          </exclusions>
                  </dependency>

Add the following content below line 100:

                         <exclusions>
                                 <exclusion>
                                         <groupId>io.netty</groupId>
                                         <artifactId>netty-transport-native-epoll</artifactId>
                                 </exclusion>
                         </exclusions>

Add the following content below line 121:

                         <exclusions>
                             <exclusion>
                                 <groupId>io.projectreactor.netty</groupId>
                                     <artifactId>reactor-netty</artifactId>
                             </exclusion>
                         </exclusions>

Press Esc, type :wq!, and press Enter to save the file and exit.

Go to the spring-boot-project/spring-boot-starters/spring-boot-starter-webflux directory.
1

cd ../spring-boot-starters/spring-boot-starter-webflux/

Remove the dependency of netty-transport-native-epoll on the x86-64 version.

Open the pom.xml file.
1

vim pom.xml

Press i to enter the insert mode and modify the following content.

Add the following content below line 33:

                          <exclusions>
                                <exclusion>
                                          <groupId>io.netty</groupId>
                                          <artifactId>netty-transport-native-epoll</artifactId>
                                </exclusion>
                          </exclusions>

Press Esc, type :wq!, and press Enter to save the file and exit.

Switch to the spring-boot-starter-artemis directory.
1

cd ../spring-boot-starter-artemis

Remove the dependency of netty-transport-native-epoll on the x86-64 version.

Open the pom.xml file.
1

vim pom.xml

Press i to enter the insert mode and modify the following content.

Add the following content below line 37:

                                <exclusion>
                                        <groupId>io.netty</groupId>
                                        <artifactId>netty-transport-native-epoll</artifactId>
                                </exclusion>

Press Esc, type :wq!, and press Enter to save the file and exit.

Switch to the spring-boot-starter-rsocket directory.
1

cd ../spring-boot-starter-rsocket

Remove the dependency of netty-transport-native-epoll on the x86-64 version.

Open the pom.xml file.
1

vim pom.xml

Press i to enter the insert mode and modify the file. Then save the file and exit.

Add the following content below line 31:

                        <exclusions>
                              <exclusion>
                                        <groupId>io.netty</groupId>
                                        <artifactId>netty-transport-native-epoll</artifactId>
                              </exclusion>
                        </exclusions>

Press Esc, type :wq!, and press Enter to save the file and exit.

Configure Cntlm.
If a proxy is required for the server to access the Internet, configure Cntlm. For details, see Configuring Cntlm.

Save the netty-transport-native-epoll-4.1.43.Final-linux-aarch_64.jar and netty-transport-native-epoll-4.1.48.Final.jar packages of the ARM64 architecture to the local Maven repository.

For CentOS 7.6/openEuler 20.03, see Failed to Obtain netty-transport-native-epoll.

For CentOS 8.1, perform the following operations:

Create the library directory if it does not exist.

mkdir -p /root/.m2/repository/io/netty/netty-transport-native-epoll/4.1.43.Final
mkdir -p /root/.m2/repository/io/netty/netty-transport-native-epoll/4.1.48.Final

Obtain the netty-transport-native-epoll-4.1.43.Final-linux-aarch_64.jar and netty-transport-native-epoll-4.1.48.Final.jar packages.

You can also obtain the JAR package for CentOS 8.1 by following instructions in netty-transport-native-epoll-4.1.43.Final-linux-aarch_64.jar Porting Guide.

wget https://mirrors.huaweicloud.com/kunpeng/maven/io/netty/netty-transport-native-epoll/4.1.43.Final/netty-transport-native-epoll-4.1.43.Final-linux-aarch_64.jar --no-check-certificate
wget https://mirrors.huaweicloud.com/kunpeng/maven/io/netty/netty-transport-native-epoll/4.1.48.Final/netty-transport-native-epoll-4.1.48.Final.jar --no-check-certificate

Save the JAR package to the local Maven repository.

mv netty-transport-native-epoll-4.1.43.Final-linux-aarch_64.jar /root/.m2/repository/io/netty/netty-transport-native-epoll/4.1.43.Final
mv netty-transport-native-epoll-4.1.48.Final.jar /root/.m2/repository/io/netty/netty-transport-native-epoll/4.1.48.Final

Perform the compilation and installation.
```
cd /home/spring-boot
mvn clean install
```
If an error is reported during the compilation, rectify the fault based on the error information. For details, see Troubleshooting. After the fault is rectified, run the compilation and installation commands again.
```
mvn spring-javaformat:apply clean install
```
If the Java file (*.java) has been modified, add the compilation parameter spring-javaformat:apply to the compilation and installation command.

Parent topic: Spring Boot Porting Guide