【排錯】springboot項目，啟動報An attempt was made to call the method com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder; but it does not exist.

本文轉載自查看原文 2019-10-15 10:04 2865 SpringBoot/ Spring

pom文件新引入：

    <dependency>         <groupId>com.google.code.gson</groupId>         <artifactId>gson</artifactId>         <version>2.3</version>     </dependency>


但啟動后報錯：

An attempt was made to call the method com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder; but it does not exist. Its class, com.google.gson.GsonBuilder, is available from the following locations:

    jar:file:/home/haoyun/apache-tomcat-8.5.40/webapps/admin/WEB-INF/lib/gson-2.3.1.jar!/com/google/gson/GsonBuilder.class

It was loaded from the following location:

    file:/home/haoyun/apache-tomcat-8.5.40/webapps/admin/WEB-INF/lib/gson-2.3.1.jar

Action:

Correct the classpath of your application so that it contains a single, compatible version of com.google.gson.GsonBuilder

14-Oct-2019 17:27:33.004 SEVERE [localhost-startStop-1] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/admin]]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:754)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:730)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:980)
        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1851)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)

當前引入的gson版本是2.3的，在Maven dependience中查看有2.8.5的版本依賴，可是我全文搜索都不知道項目原來在哪里引入過gson的依賴。

原來父pom中有spring-boot-starter-parent

<parent>   <groupId>org.springframework.boot</groupId>   <artifactId>spring-boot-starter-parent</artifactId>   <version>2.0.1.RELEASE</version>  </parent>

點擊上面的spring-boot-starter-parent，查看其源碼，發現它又繼承了spring-boot-dependencies：

<parent>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-dependencies</artifactId>         <version>2.0.1.RELEASE</version>         <relativePath>../../spring-boot-dependencies</relativePath>     </parent>


點擊上面的spring-boot-dependencies，查看其源碼，搜索gson，發現這里確實已經引入了gson的依賴：2.8.5

解決辦法：pom.xml 里引入依賴時，刪掉 <version>2.3</version>這一行，Spring Boot 會自動查找匹配最合適的版本。

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