一起使用 Spring Boot、QueryDSL 和 Springfox Swagger - Guava 版本不匹配

Question

I'm trying to use QueryDSL for Spring Data predicate resolution as well as Swagger API documentation for my Spring Boot service. However I've run into a problem. When my application starts, I get this error message:

java.lang.NoSuchMethodError: 'com.google.common.collect.FluentIterable com.google.common.collect.FluentIterable.concat(java.lang.Iterable, java.lang.Iterable)

An attempt was made to call a method that does not exist. The attempt was made from the following location:
 springfox.documentation.schema.DefaultModelDependencyProvider.dependentModels(DefaultModelDependencyProvider.java:79)

The following method did not exist:

    'com.google.common.collect.FluentIterable com.google.common.collect.FluentIterable.concat(java.lang.Iterable, java.lang.Iterable)'

The method's class, com.google.common.collect.FluentIterable, is available from the following locations:

    jar:file:/my_m2/com/google/guava/guava/18.0/guava-18.0.jar!/com/google/common/collect/FluentIterable.class

Action:

Correct the classpath of your application so that it contains a single, compatible version of com.google.common.collect.FluentIterable

I've discovered that this is happening because QueryDSL is dependent on Guava 18.0 library, but Springfox / Swagger is dependent on Guava 20.0 library, so I end up with both versions of the library on my classpath and maven seems to prioritize the 18.0 one. How can I fix this dependency mismatch? Is there any way to force QueryDSL to try to use Guava 20.0 (in the hopes that it will still function)? Or could there possibly be any other way around this?

Versions: Spring Boot version: 2.1.9.RELEASE This version of Spring Boot uses QueryDSL version: 4.2.1 Springfox Swagger version: 2.9.2

Answer 1

If using Gradle, you can force the use of a specific library version. In this case, you may use the following syntax -

configurations.all {
    resolutionStrategy.force "com.google.guava:guava:$guavaVersion"
}

I'm sure there's a similar solution if you use a different build tool.