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maven项目编译报错：

1.

[ERROR] Failed to execute goal on project ilcbs_server_dao: 
Could not resolve dependencies for project com.syy:ilcbs_server_dao:pom:1.0-SNAPSHOT: 
The following artifacts could not be resolved: 
com.syy:ilcbs_server_domain:jar:1.0-SNAPSHOT, com.syy:ilcbs_utils:jar:1.0-SNAPSHOT, 
com.syy:ilcbs_exception:jar:1.0-SNAPSHOT, com.syy:ilcbs_cache:jar:1.0-SNAPSHOT: 
Could not find artifact com.syy:ilcbs_server_domain:jar:1.0-SNAPSHOT -> [Help 1]

错误原因：

1. 运行父模块时，未将子模块的项目打包。

2. pom配置的打包方式错误：父模块的pom打包方式通常为pom，子模块的为jar或者war。

解决方法：父项目和所有的子项目都要打包

2.

Failed to execute goal org.apache.maven.plugins:
maven-war-plugin:2.2:war (default-war) on project *****: 
Error assembling WAR: webxml attribute is required 
(or pre-existing WEB-INF/web.xml if executing in update mode) -> [Help 1]

错误原因：war打包的项目缺少了web.xml文件。