maven install 出现编码 utf-8/gbk 的不可映射字符

<!--工程编码是gbk，编译时出现 编码 utf-8 的不可映射字符,还有警告：1.6解决com.sun.org.apache.xerces.internal.impl.Constants 是 Sun 的专用 API，可能会在未来版本中删除问题-->
<properties>
<project.build.sourceEncoding>GBK</project.build.sourceEncoding>
</properties>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<encoding>GBK</encoding>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>

工程编码是utf-8
则应该这样
<properties>
<project.build.sourceEncoding>utf-8</project.build.sourceEncoding>
</properties>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<encoding>utf-8</encoding>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>