jruby 异常处理

1.运行命令：>rake db:migrate

报错：

ERROR: 'rake/rdoctask' is obsolete and no longer supported. Use 'rdoc/task'

 

解决方法：rake版本太高，降低版本

gem uninstall rake --version 10.0.4
gem install rake --version 0.8.7

 

2.The driver encountered an error: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

解决方法：启动mysql

3.rake aborted!
The driver encountered an error: org.jruby.runtime.builtin.IRubyObject.setInstanceVariable(Ljava/lang/String;Lorg/jruby/runtime/builtin/IRubyObject;)Lorg/jruby/runtime/builtin/IRubyObject;

 

4.Gem 'ruby-debug-ide' isn't installed or its executable script 'rdebug-ide' doesn't exist

 

解决方法：

gem install ruby-debug-ide --pre

gem install linecache