How to configure additional classpath in SpringBoot?

Question

I want to make standalone web application. I have some problem with SpringBoot.

My application is one jar file from SpringBoot.

But my application was usually needed jdbc driver jar. I want to exclude jdbc driver jar for my application. I want to read library jar from lib folder.

But SpringBoot lib folder is BOOT-INF/lib is final static.

So, I want to add external classpath (lib) for jdbc driver jar.

How to configure additional classpath in SpringBoot. Is it available?

Answer 1

You may refer this below link from spring boot:

https://docs.spring.io/spring-boot/docs/current/reference/html/executable-jar.html#executable-jar-property-launcher-features

You can use the loader.path property to define a lib folder location

Answer 2

You can use the loader.path parameter to define a location for an external lib folder. All jars under this folder will be added to the classpath. For example, if you'd like to define C:\extLib as your external lib folder, you can do the following:

java -Dloader.path=/C:/extLib/ -jar aapName.jar

For this to work, you need to use the PropertiesLauncher. There are two ways to do that:

Option 1

Update the project pom.xml and add the following tag:

<configuration>  <!-- added -->
  <layout>ZIP</layout> <!-- to use PropertiesLauncher -->
</configuration

Effective build tag, post update looks like below:

<build> 
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>  <!-- added -->
                <layout>ZIP</layout> <!-- to use PropertiesLauncher -->
            </configuration>
        </plugin>
    </plugins>
</build>

Option 2

Use the PropertiesLauncher when launching the application from the commandline:

java -cp aapName.jar -Dloader.path=/C:/extLib/ org.springframework.boot.loader.PropertiesLauncher

References: https://mash213.wordpress.com/2017/01/05/hack-how-2-add-jars-2-springboot-classpath-with-jarlauncher/