Recently, the project has been completed, and I have some free time to review my previous knowledge in order to apply it more effectively in the future. I decided to start with Maven, then build an SSH + MyBatis framework, and finally finish the Hadoop distribution-related tasks.
Before installing any tools, I first configured the relevant environment variables on my computer. This is a crucial step to ensure that everything runs smoothly later.
First, I set up the Maven environment. The download link for Maven is available here (for Windows, choose the Binary zip version). After downloading, I extracted the Maven archive and configured the environment variables. To do this, I went to "Computer" > "System Properties" > "Advanced System Settings" > "Environment Variables." Then, I created a new system variable called M2_HOME and set its value to the path where I extracted Maven, such as E:\apache-maven-3.2.5. Next, I added %M2_HOME%\bin to the PATH variable so that the system can recognize the mvn command. Finally, I opened the command prompt and typed 'mvn -v' to check if the installation was successful.
Next, I changed the local repository location for Maven. By default, it's stored in the user directory under .m2/repository, but I prefer to store it on another drive to manage space better. I configured it to be located at E:/m2/repository. Then I opened the command prompt and ran 'mvn help:system' to download some basic information and verify that the configuration was working correctly.
Then, I configured the Maven plugin in Eclipse. I started by opening Eclipse and going to Help > Install New Software > Add. I entered the name 'm2e' and the location URL. However, since the original site might be down, I downloaded the plugin from my Baidu Netdisk. After extracting the ZIP file, I copied the contents of the features and plugins folders into the corresponding directories of my Eclipse installation. Once done, I restarted Eclipse.
Next, I configured the user-level settings.xml file. The global settings.xml file is located at %M2_HOME%/conf/setting.xml, which affects all users on the machine. To avoid affecting others, I copied this file to my own repository, such as F:/m2/setting.xml.
I also set the MAVEN_OPTS environment variable to prevent OutOfMemoryError when working with large projects. There are two ways to do this: either edit the mvn.bat file in the Maven bin directory and add 'set MAVEN_OPTS= -Xms125m -Xmx512m', or set the variable directly in the system environment variables with the same values.
Finally, I configured Eclipse to use the correct Maven installation. I went to Window > Preferences > Maven and selected the installed Maven directory. I made sure to uncheck the default Maven and add my custom one. This ensures that Eclipse uses the correct version of Maven for my projects.
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