1. 初始设置

2. 启动报错

Caused by: java.lang.IllegalArgumentException: Circular placeholder reference 'canal.host' in property definitions

              atorg.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:139)

              at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:160)

              atorg.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124)

              atorg.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:237)

              atorg.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:211)

              atorg.springframework.core.env.AbstractPropertyResolver.resolveNestedPlaceholders(AbstractPropertyResolver.java:228)

              atorg.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:88)

              atorg.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:62)

3. 原因

properties文件中左右两边的变量名相同

4. 措施

修改properties文件，使左右两边的变量名不相同。

原文链接：https://blog.csdn.net/J_bean/article/details/80026674