Idea报错:Command line is too long. Shorten command line for className

问题描述

使用Idea运行项目在项目启动时报错:

Command line is too long. Shorten command line for XXXApplication or also for Spring Boot default configuration.

问题分析

这种异常的出现是因为运行项目的指令过长引起的，在IDEA进行代码运行时加载了很多指令，这些指令拼接后的长度超出了系统的最大长度，当你的命令行长度超过 32768 个字符时，idea就会提示你使用短一点的命令行。

大家可以在运行项目是看一下console输出的第一行日志，一般就是你的运行conmand

问题解决

方式一:

在idea的.idea/workspace.xml中开启动态路径。

在workspace.xml中的

<component name="PropertiesComponent">条目下添加属性

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

可以使idea在执行通过动态路径去寻找项目路径，具体的实现原理，但是可以查看idea社区版的源码。

方式二:

在项目配置的运行参数配置中可以选择短命令行运行即Shorten command line

依次执行run–>edit configurations–>你的项目–>configuration–>Environment

在此条目下选择Shorten command line默认选择的是user-local default:none

这里有三个选项:

none

classpath file

jar manifest

此处可以选classpath file或者jar manifest运行项目也可解决此问题

写在最后

当改了配置后我们可以看一下我们的conmand line情况

D:\work\jdk1.8.0_101\bin\java.exe -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:57607,suspend=y,server=n -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -javaagent:C:\Users\jonas\AppData\Local\JetBrains\IntelliJIdea2020.2\captureAgent\debugger-agent.jar -Dfile.encoding=UTF-8 -classpath C:\Users\jonas\AppData\Local\Temp\classpath1326103414.jar com.xxx.service.order.admin.ServiceOrderAdminApplication

1

可以看到应用启动的时候是有加载jmx的，我这里把jmx关一下，看一下是否能正常运行。

运气不错，关闭jmx后，项目运行起来了，但是运行的conmand line的长度真的是让人感动，之前那还怀疑真的会有那么长的命令行么，还真的有，以下为默认的启动命令行。

D:\work\jdk1.8.0_101\bin\java.exe -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:57826,suspend=y,server=n -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -javaagent:C:\Users\jonas\AppData\Local\JetBrains\IntelliJIdea2020.2\captureAgent\debugger-agent.jar -Dfile.encoding=UTF-8 -classpath 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