现象：
nexus Windows系统服务安装成功，但启动失败
D:\nexus-2.10.0-02-bundle\nexus-2.10.0-02\bin>nexus.bat
Usage: nexus.bat { console : start : stop : restart : install : uninstall }
请按任意键继续. . .
D:\nexus-2.10.0-02-bundle\nexus-2.10.0-02\bin>nexus.bat install
wrapper | nexus installed.
D:\nexus-2.10.0-02-bundle\nexus-2.10.0-02\bin>nexus.bat start
wrapper | Starting the nexus service...
wrapper | The nexus service was launched, but failed to start.
请按任意键继续. . .
日志（wrapper.log）
wrapper | Unable to execute Java command. 系统找不到指定的文件。 (0x2)
wrapper | "java" -Djava.io.tmpdir=./tmp -Djava.net.preferIPv4Stack=true
wrapper | Critical error: wait for JVM process failed
wrapper | The nexus service was launched, but failed to start.
解决：
nexus-2.10.0-02/bin/jsw/conf/wrapper.conf
# Set the JVM executable
# (modify this to absolute path if you need a Java that is not on the OS path)
wrapper.java.command=C:\Program Files\Java\jdk1.7.0_67\jre\bin\java.exe