原因：更改了jdk安装版本

方法：修改netbeans安装目录下ect下netbeans文件，

详细代码位置：

# Default location of JDK:

# (set by installer or commented out if launcher should decide)

#

# It can be overridden on command line by using --jdkhome <dir>

# Be careful when changing jdkhome.

# There are two NetBeans launchers for Windows (32-bit and 64-bit) and

# installer points to one of those in the NetBeans application shortcut

# based on the Java version selected at installation time.

#

netbeans_jdkhome="C:\Program Files\Java\jdk1.7.0_67"//在此处修改，把你jdk安装目录复制到此处

# Additional module clusters:

# using ${path.separator} (';' on Windows or ':' on Unix):

#

#netbeans_extraclusters="/absolute/path/to/cluster1:/absolute/path/to/cluster2"