Can you share the repository please?

I use Maven. My POM file build section:

<build>

<plugins>

<plugin>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-jar-plugin</artifactId>

<configuration>

<archive>

<manifest>

<addClasspath>true</addClasspath>

<mainClass>com.equiz.project.EquizApplication</mainClass>

</manifest>

</archive>

</configuration>

</plugin>

</plugins>

</build>

Package path:

com.equiz.project

Main application class name:

EquizApplication

Below is the build error:

Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication

at com.equiz.project.EquizApplication.main(EquizApplication.java:11)

Caused by: java.lang.ClassNotFoundException: org.springframework.boot.SpringApplication

at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)

at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)

at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)

I hate Java.

I hate Maven even more. Using Maven over Gradle in 2025 is literally insanity.

You should ask your question in a SpringBoot targeted server. People here are not fluent in SpringBoot, and your issue has nothing to do with Railway.

It works now. Below is the build section I used.

This is a Java project using SpringBoot framework with Maven for dependency management.

<build>

<plugins>

<plugin>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-maven-plugin</artifactId>

</plugin>

</plugins>

</build>