How to import external libraries in jshell java 9?

Question

I was trying to understand jshell and fumbled to import external library. As of date I couldn't see any suggestion/solution for this.

Can someone please let me know if already figured this out.

Answer 1

I tried with 9 Build 162 Linux 64-bit with preparation:

• Downloaded guava-19.0.jar and commons-lang3-3.4.jar to /opt/libs

The following options are available:

1. Specify CLASSPATH environment variable:

   $> CLASSPATH="/opt/libs/commons-lang3-3.4.jar:/opt/libs/guava-19.0.jar" bin/jshell

2. Specify classpath with jshell option:

   $> bin/jshell --class-path /opt/libs/guava-19.0.jar:/opt/libs/commons-lang3-3.4.jar

3. Configure evaluation context within jshell session with command /env, /reset or /reload(these commands are different, you can check out with its help info), take /env as example:

   jshell> /env -class-path /opt/libs/commons-lang3-3.4.jar:/opt/libs/guava-19.0.jar

And then you're able to either import org.apache.commons.lang3.StringUtils or import com.google.common.base.Optional;.

Answer 2

• You can load maven artifacts into JShell through this (modified) version of JShell.
• It also supports /cls command to clear JShell Console. See Maven Example below.

Give a try and share your feedback.

Answer 3

Easier way in maven, see In JShell, how to import classpath from a Maven project: In your project directory, run:

mvn com.github.johnpoth:jshell-maven-plugin:1.0:run

---

If you have a maven pom.xml, you can use https://github.com/bitterfox/jshell-maven-plugin. This uses all dependencies as the classpath. The plugin is not currently in maven, so you need to clone the repo: git clone https://github.com/bitterfox/jshell-maven-plugin.git. Then,

1. mvn clean install

2. add the following to your pom.xml:

   <build>
   <plugins>
       <plugin>
           <groupId>net.java.openjdk.shinyafox</groupId>
           <artifactId>jshell-maven-plugin</artifactId>
           <version>1.0-SNAPSHOT</version>
       </plugin>
   </plugins>
   </build>
   

3. start with mvn jshell:compile

Answer 4

Start Jshell importing all jars from a directory

Let directory is ~/app/java/jars/

jshell --class-path $(ls -d ~/app/java/jars/* | tr '\n' ':')

Answer 5

If you are using Fish shell, you can set the alias in your fish config file. Here's how you can do it. In your fish config ( ~/.config/fish/config.fish ), add

alias jshell "~/.jenv/versions/12.0.1/bin/jshell --class-path (find ~/.m2/repository/ -name \"*.jar\" | tr '\n' ':')"

This will load all the jars in your class path.

Note: Change the jshell path and jars repository path accordingly.