Spring Boot module not found error

问题

I am creating a Spring Boot application on Java 9. If I keep parent as below in pom.xml:

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
</parent>

and module-info.java as:

module com.journaldev.spring.SpringWebflux {
    requires reactor.core;
    requires spring.web;
    requires spring.context;
    requires spring.webflux;
    requires spring.boot;
    requires spring.boot.autoconfigure;
}

Then I get errors as module not found.

module-info.java:[2,21] module not found: reactor.core
module-info.java:[3,20] module not found: spring.web
module-info.java:[4,20] module not found: spring.context
module-info.java:[5,20] module not found: spring.webflux
module-info.java:[6,20] module not found: spring.boot
module-info.java:[7,25] module not found: spring.boot.autoconfigure

If I lower the spring-boot-starter-parent version to 2.0.0.RELEASE then this error is gone. I am trying to understand why?

回答1:

As discussed in the comments, the jar was corrupted (which can happen when you upgrade to a newer version and something wrong happened at network level). Clearing that from the maven or gradle cache is usually enough to get rid of the problem.

来源：https://stackoverflow.com/questions/50196952/spring-boot-module-not-found-error

标签

java

spring-boot

java-9