序

在mybatis的interceptor获取MapperMethod.ParamMap这种参数类型时，经常会多出param1，param2，collection，list，array这些参数，这些不是接口自己定义的，而是ParamNameResolver自动添加的

提示的错误信息如下：

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.9.1:jar (attach-javadocs) on project codebank: MavenReportException: Error while creating archive: Unable to find javadoc command: The environment variable JAVA_HOME is not correctly set. -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

maven_springboot打jar包

一、选择package后执行

Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.22.2:test

开发记录

有一个maven项目，我clone一下最新的代码。准备打包（maven package），没想到在执行到TEST阶段报错。百思不得其解，决定跳过测试去打包，然后部署。

如果你去网上搜怎么解决,好吧,大部分是说,你要找到这个文件,然后删除掉:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-install-plugin:2.5.2:install (default-install) on project appscomm-account: Failed to install metadata com.appscomm:appscomm-account/maven-metadata.xml: Could not parse metadata /test/maven-metadata-local.xml: in epilog non whitespace content is not allowed but got n (position: END_TAG seen ...</metadata>\nn... @13:2) -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:

学习笔记：

1.setting.xml主要用于配置maven的运行环境等一系列通用的属性，是全局级别的配置文件；而pom.xml主要描述了项目的maven坐标，依赖关系，开发者需要遵循的规则，缺陷管理系统，组织和licenses，以及其他所有的项目相关因素，是项目级别的配置文件。

将文件间的编译依存关系降至最低

新手写C++的时候，可能会喜欢把所有函数放在一个文件下，显得功能又大又全，又或者是在写类的时候弄很多成员函数，其实这样对于经常修改的代码来说不好。现在给出单文件编译和多文件编译的例子，分别进行对比。