Fail to start Mongock CLI with Spring Boot, NullPointerException: Cannot invoke buildRunner

Question

I've tried using Mongock for DB migrations and it's a really good tool. It activates when main application is launched. Recently I found out that there is Mongock CLI, and it suits better for my aims. Unfortunately, I fail to make it work. I took my previous project as template, mvn clean package it, jar file is successfully created in target folder. I follow instructions in documentation, but get an error.

Maybe I launch it incorrectly or I'm missing some code. That's what I do in console: cd D:\Programs\mongock-cli-5.0.26 (path to mongock cli) and ./mongock migrate all -aj D:\Java Projects\mongock\target\cinema.jar (path to intellij idea project, which contains the jar)

It generates this file:

#!/bin/sh
#Generated cli script
 java -jar mongock-cli-5.0.26.jar \
 --cli-spring-jar lib/mongock-cli-springboot-5.0.26.jar \
 --cli-core-jar lib/mongock-cli-core-5.0.26.jar \
 --mongock-core-jar lib/mongock-runner-core-5.1.0.jar \
 "$@"  \
  \

As I understand, I should copy it to console. I removed backslashes (it doesn't work if they stay), and that's the string I've got: java -jar mongock-cli-5.0.26.jar --cli-spring-jar lib/mongock-cli-springboot-5.0.26.jar --cli-core-jar lib/mongock-cli-core-5.0.26.jar --mongock-core-jar lib/mongock-runner-core-5.1.0.jar and I added migrate all to the end of this string. I run it in console and get an error:

i.m.cli.wrapper.launcher.LauncherDefault : launching Mongock CLI runner with default launcher java.lang.NullPointerException: Cannot invoke "io.mongock.runner.core.builder.RunnerBuilder.buildRunner(io.mongock.runner.core.executor.operation.Operation)" because "this.builder" is null at io.mongock.cli.core.commands.migrate.MigrateCommand.all(MigrateCommand.java:38)

Do you have any ideas how to solve it? Should I include @Bean RunnerBuilder? It was't specified in docs, so I guess my mistake is in something else.

I also tried to run a bash file with that generated code (I'm using Windows): bash script.sh, but nothing happened. Cursor just moves to the next line and no changes applied in DB.

Answer 1

That seems to happen because you are not passing the parameter -aj to provide your uber jar.

The command should be something like this:

java -jar mongock-cli-5.0.26.jar --cli-spring-jar lib/mongock-cli-springboot-5.0.26.jar --cli-core-jar lib/mongock-cli-core-5.0.26.jar --mongock-core-jar lib/mongock-runner-core-5.1.0.jar migrate all -aj D:\YOUR_JAR_PATH.jar

That should work.

Anyway, the Mongock team is providing a bat script that will do the same as the current .sh script for Linux. It's expected to be released at the end of the day. If not, in the next few days :)