logstash6 如何设置JAVA路径

启动抛如下异常
 NameError: cannot link Java class org.logstash.RubyUtil org/logstash/RubyUtil : Unsupported major.minor version 52.0
  method_missing at org/jruby/javasupport/JavaPackage.java:259
          <main> at /usr/local/elk/logstash-6.1.1/logstash-core/lib/logstash-core/logstash-core.rb:37
         require at org/jruby/RubyKernel.java:955
          <main> at /usr/local/elk/logstash-6.1.1/logstash-core/lib/logstash/runner.rb:1
         require at org/jruby/RubyKernel.java:955
          <main> at /usr/local/elk/logstash-6.1.1/lib/bootstrap/environment.rb:66

linux可以新建用户，修改个人用户主目录下的 .bashrc文件
windows上在logstash的bin下setup.bat中添加

linux中，可以直接在启动文件logstash中开头加上 
JAVA_HOME="/you_java8_path"