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  • 【排错】springboot项目,启动报An attempt was made to call the method com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder; but it does not exist.

    pom文件新引入:

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


    但启动后报错:

    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)

    当前引入的gson版本是2.3的,在Maven dependience中查看有2.8.5的版本依赖,可是我全文搜索都不知道项目原来在哪里引入过gson的依赖。

    原来父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>

    点击上面的spring-boot-starter-parent,查看其源码,发现它又继承了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>


    点击上面的spring-boot-dependencies,查看其源码,搜索gson,发现这里确实已经引入了gson的依赖:2.8.5

    解决办法:pom.xml 里引入依赖时,删掉 <version>2.3</version>这一行,Spring Boot 会自动查找匹配最合适的版本。
     
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  • 原文地址:https://www.cnblogs.com/yingsong/p/11675880.html
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