问题描述：
使用jetty:run启动项目时，build failure，程序包不存在

[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.678 s
[INFO] Finished at: 2017-09-14T23:34:18+08:00
[INFO] Final Memory: 17M/142M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project crm: Compilation failure: Compilation failure: 
[ERROR]/E:/EclipseWorkspace/.../src/main/java/com/...utils/UserIDBase64.java:[5,54] 程序包com.sun.org.apache.xml.internal.security.utils不存在
[ERROR] /E:/EclipseWorkspace/...理/src/main/java/com/.../utils/UserIDBase64.java:[23,59] 找不到符号
[ERROR]   符号:   变量 Base64
[ERROR]   位置: 类 com....utils.UserIDBase64
[ERROR] /E:/...理/src/main/java/com/.../utils/UserIDBase64.java:[36,46] 找不到符号
[ERROR]   符号:   变量 Base64
[ERROR]   位置: 类 com.....utils.UserIDBase64
[ERROR] /E:/EclipseWorkspace/...理/src/main/java/com/.../utils/UserIDBase64.java:[37,53] 找不到符号
[ERROR]   符号:   变量 Base64
[ERROR]   位置: 类 com.....utils.UserIDBase64
[ERROR] -> [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/MojoFailureException

解决方式:添加下面一段内容，指明rt.jar的路径

<plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <compilerArguments>
                        <bootclasspath>${JAVA_HOME}/jre/lib/rt.jar</bootclasspath>
                    </compilerArguments>
                </configuration>
            </plugin>