我们idea第一次运行spring boot项目的时候可能会出现这种提示：

运行 FpyServerApplication 时出错。命令行过长。

通过 JAR 清单或通过类路径文件缩短命令行，然后重新运行

这个时候需要修改一下 项目根目录 .idea 文件夹下的 workspace.xml 文件

（1）如果是这种样式的话

 <component name="PropertiesComponent"><![CDATA[{
  "keyToString": {
    "RunOnceActivity.OpenProjectViewOnStart": "true",
    "RunOnceActivity.ShowReadmeOnStart": "true",
    "WebServerToolWindowFactoryState": "false",
    "node.js.detected.package.eslint": "true",
    "settings.editor.selected.configurable": "MavenSettings",
    "spring.configuration.checksum": "b68eddc20618f0021d9e6631a68262d2"
  }
}]]></component>

添加以下内容：

"dynamic.classpath": "true"

添加完成以后的样式：

 <component name="PropertiesComponent"><![CDATA[{
  "keyToString": {
    "RunOnceActivity.OpenProjectViewOnStart": "true",
    "RunOnceActivity.ShowReadmeOnStart": "true",
    "WebServerToolWindowFactoryState": "false",
    "node.js.detected.package.eslint": "true",
    "settings.editor.selected.configurable": "MavenSettings",
    "spring.configuration.checksum": "b68eddc20618f0021d9e6631a68262d2",
    "dynamic.classpath": "true"
  }
}]]></component>

（2）如果是这种样式的话

 <component name="PropertiesComponent">
    <property name="RunOnceActivity.OpenProjectViewOnStart" value="true" />
    <property name="RunOnceActivity.ShowReadmeOnStart" value="true" />
    <property name="settings.editor.selected.configurable" value="project.propCompiler" />
  </component>

添加一行代码：

<property name="dynamic.classpath" value="true" />

添加完以后的展示效果：

  <component name="PropertiesComponent">
    <property name="RunOnceActivity.OpenProjectViewOnStart" value="true" />
    <property name="RunOnceActivity.ShowReadmeOnStart" value="true" />
    <property name="settings.editor.selected.configurable" value="project.propCompiler" />
    <property name="dynamic.classpath" value="true" />
  </component>