java - 使用多模块 Maven 项目时 Eclipse 的类路径问题

Question

我有一个 spring-boot 2 项目，其中有很多子模块。

某些模块使用的库包括 jackson-databind 。我为他们添加了排除项。当做mvn dependency:tree | grep jackson-databind时，我没有2.2.2依赖关系。使用mvn spring-boot:run工作完美。但是，在 eclipse 中启动应用程序会导致以下错误。

我应该在哪里寻找错误根源？

***************************
APPLICATION FAILED TO START
***************************

Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:

    org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.registerWellKnownModulesIfAvailable(Jackson2ObjectMapperBuilder.java:777)

The following method did not exist:

    com.fasterxml.jackson.databind.Module.getTypeId()Ljava/lang/Object;

The method's class, com.fasterxml.jackson.databind.Module, is available from the following locations:

    jar:file:/C:/Users/somebody/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.2.2/jackson-databind-2.2.2.jar!/com/fasterxml/jackson/databind/Module.class
    jar:file:/C:/Users/somebody/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.6.6/jackson-databind-2.6.6.jar!/com/fasterxml/jackson/databind/Module.class
    jar:file:/C:/Users/somebody/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.9.8/jackson-databind-2.9.8.jar!/com/fasterxml/jackson/databind/Module.class
    jar:file:/C:/Users/somebody/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.8.8/jackson-databind-2.8.8.jar!/com/fasterxml/jackson/databind/Module.class

It was loaded from the following location:

    file:/C:/Users/somebody/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.2.2/jackson-databind-2.2.2.jar


Action:

Correct the classpath of your application so that it contains a single, compatible version of com.fasterxml.jackson.databind.Module

Answer 1

嗯。似乎该项目被错误地导入到 eclipse 中。也许 mvn eclipse:eclipse 是罪魁祸首。

• 从工作区中删除项目
• 删除所有 Eclipse 项目文件(.project、.classpath 等)
• 将它们放入.gitignore
• 通过导入maven项目导入项目

现在可以了。