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.

See https://stackoverflow.com/a/51572213/3728901 – Vy Do Jul 28 '18 at 15:09 — Vy Do, Jul 28 '18 at 15:09

score 79 · Accepted Answer · edited Feb 26 '18 at 16:56

79

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:

Specify CLASSPATH environment variable:

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

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

edited Feb 26 '18 at 16:56

Prags

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answered Mar 30 '17 at 08:50

shizhz

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Under Windows 7 it works in the same way - set the CLASSPATH environmental variable, which points to the jar file, then use 'import' to import the class/package. – y434y Apr 06 '17 at 17:15
@Prags I am trying to use option2 and 3 in windows 10 environment with Jshell it is not working do we need to do something else to make it work in Windows10. – Beast Mar 22 '19 at 09:16
@Beast can you check this, might it help you http://www.java67.com/2012/08/what-is-path-and-classpath-in-java-difference.html – Prags Mar 25 '19 at 09:36
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@Beast JShell on Windows requires either double-backslash paths `\\ ` or forward slash paths `/` separated by semicolon `;` - e.g., `/env --class-path c:/path/to/jars/file.jar;c:\\another\\path\\to\\jars\\file.jar` – Thomas Taylor Jun 30 '20 at 14:12
For me, on windows, I have to omit `/env`, just `--class-path c:/path...` – dudeNumber4 Jul 13 '22 at 19:31

score 14 · Answer 2 · edited Apr 05 '18 at 10:00

14

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.

edited Apr 05 '18 at 10:00

serv-inc

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answered Apr 28 '17 at 15:32

B. S. Rawat

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"/resolve" is not available in the Java 9 release version of JShell – Jason Dec 08 '17 at 12:28
1

yes /resolve and /cls are not there in Java 9. We have added them in our JShell version. – B. S. Rawat Aug 07 '18 at 22:52

serv-inc · Answer 3 · 2018-04-26T08:36:45.220

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,

mvn clean install

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>

start with mvn jshell:compile

score 8 · Answer 4 · answered Nov 05 '18 at 06:47

8

Start Jshell importing all jars from a directory

Let directory is ~/app/java/jars/

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

answered Nov 05 '18 at 06:47

smamran

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score 1 · Answer 5 · answered Sep 01 '19 at 07:31

1

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.

answered Sep 01 '19 at 07:31

Dinesh Chander

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it has some scripting error but this will work - `jshell --class-path $(find ~/.m2/repository/ -name "*.jar" | tr '\n' ':')` make sure you don't have too many jars otherwise you will get `bash: /usr/bin/jshell: Argument list too long` – prayagupa Feb 08 '20 at 05:59

score 1 · Answer 6 · answered Feb 03 '23 at 14:03

1

You can load external library with the command:

/env --class-path /path/to/jar/file

answered Feb 03 '23 at 14:03

xyz

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score 0 · Answer 7 · edited Mar 10 '21 at 13:35

If you use script like (find -name "*.jar" | tr '\n' ':') to concat, then you alias will be huge string which I don't like.

If you want to include a directory with all jars, the trick is to use colon (:) first and then the directory name as below -

alias java-shell="~/jdk-10.0.2.jdk/Contents/Home/bin/jshell --class-path :<dir-name>/jars/* "

Otherwise it won't work properly. I wish they should have make it cleaner.

How to import external libraries in jshell java 9?

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