一、报错
![Unbound classpath container: ‘JRE System Library [jdk1.8.0_131]‘ in project XXX](https://img-blog.csdnimg.cn/2021022209211263.png)
二、解决
项目没有配置jre，配置好即可。
1、选中项目右击 -> Build Path -> Configure Build Path
![Unbound classpath container: ‘JRE System Library [jdk1.8.0_131]‘ in project XXX](https://img-blog.csdnimg.cn/20210222092814500.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTc2NDc2NQ==,size_16,color_FFFFFF,t_70)
2、选中JRE… -> Edit…
![Unbound classpath container: ‘JRE System Library [jdk1.8.0_131]‘ in project XXX](https://img-blog.csdnimg.cn/20210222092746659.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTc2NDc2NQ==,size_16,color_FFFFFF,t_70)
3、安装JRE -> Finsh
![Unbound classpath container: ‘JRE System Library [jdk1.8.0_131]‘ in project XXX](https://img-blog.csdnimg.cn/20210222092853317.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTc2NDc2NQ==,size_16,color_FFFFFF,t_70)
4、安装JRE成功 -> Apply
![Unbound classpath container: ‘JRE System Library [jdk1.8.0_131]‘ in project XXX](https://img-blog.csdnimg.cn/20210222092933682.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTc2NDc2NQ==,size_16,color_FFFFFF,t_70)
OK…
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