ERROR - Undefined placeholders found in template:

今天发现了一个BUG，在引用其他的包的的时候报错：

ERROR - Undefined placeholders found in template:
- Template:   META-INF/autoconf/xxx.xml
- Descriptor: META-INF/autoconf/xxx.xml
- Base URL:   jar:jar:file:/Users/liqiu/git/fmp/service/target/xxx.war!/WEB-INF/lib/123456.jar!/
---------------------------------------------------------------
-> undifined_version
---------------------------------------------------------------
<jar:file:/Users/liqiu/git/fmp/service/target/xxx.war!/>
    Generating log file: META-INF/autoconf/auto-config.xml.log

ERROR: undefined placeholders
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Autoconfig failed

1、这个时候，发现123456.jar是外部载入的包，需要解压这个包

jar -xvf 123456.jar

2、然后查看文件：autoconf/xxx.xml，会发现确实存在这些变量没有被定义：${undifined_version}

3、在如下文件内添加这个变量

antx.properties、auto-config.xml