启动webloigc报错，在目录/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.79.x86_64中找不到JRE。

错误重现:java The JRE was not found in directory /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.79.x86_64. (JAVA_HOME) Please edit your environment and set the JAVA_HOME variable to point to the root directory of

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