1. 打开终端, cd到.project目录下

cd /workspace/.metadata/.plugins/org.eclipse.core.resources/.projects 

2. 该目录下有当前workspace中的所有工程, 进入每一个工程, 包括Servers, 删除 .snap结尾的所有文件

3. 重启eclipse

在使用此方法时想偷懒一下，因为进入到每一个文件夹去删除 .snap比较多，就写了一个Python的Script去批量做。代码如下：

wpath = '/workspace/.metadata/.plugins/org.eclipse.core.resources/.projects'

for root, dirs, files in os.walk(wpath):

    for f in files:

        if 'snap' in f:

            os.remove(os.path.join(root,f))

方法二: 转载自 http://blog.csdn.net/fireme5535/article/details/73547041

1. 删除workspace/.metadata目录下的.lock文件（此文件为隐藏文件）

   cd ${你的workspace目录}/.metadata

   rm .lock (我的可以直接删除，如果不行需要加上sudo 授权)

2. cd /Applications/Eclipse.app/Contents/MacOS/

3. ./eclipse -clean -refresh

4. 之后会出现如下

*********MacBook:MacOS ******$ ./eclipse -clean -refresh

org.eclipse.m2e.logback.configuration: The org.eclipse.m2e.logback.configuration bundle was activated before the state location was initialized.  Will retry after the state location is initialized.

org.eclipse.m2e.logback.configuration: Logback config file: /Users/liusongshu/Documents/workspace/.metadata/.plugins/org.eclipse.m2e.logback.configuration/logback.1.7.0.20160603-1933.xml

SLF4J: Class path contains multiple SLF4J bindings.

SLF4J: Found binding in [bundleresource://956.fwk832947102:1/org/slf4j/impl/StaticLoggerBinder.class]

SLF4J: Found binding in [bundleresource://956.fwk832947102:2/org/slf4j/impl/StaticLoggerBinder.class]

SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.

SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]

org.eclipse.m2e.logback.configuration: Initializing logback

然后按住ctrl+z

然后输入bg 1

^Z

[1]+  Stopped                 ./eclipse -clean -refresh

****MacBook:MacOS *****$ bg 1

[1]+ ./eclipse -clean -refresh &

ps. 如果你的Eclipse的配置文件eclipse.ini中没有配置-vm，需要在eclipse或者环境变量中指定JAVA_HOME，不然第三步会出现乱七八糟的问题

个人体会:

发现如果Eclipse是Neon的话路径可能不太一样，我的电脑是在:

/Users/edisonshi/eclipse/jee-neon/Eclipse.app/Contents/MacOS