Could not find the main class: org.eclipse.ant.internal.launching.remote.InternalAntRunner. Program

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提示Could not find the main class: org.eclipse.ant.internal.launching.remote.InternalAntRunner. Program或提示JRE version less than 1.7 is not supported. 

解决方式：

Run As->External Tools Configurations...,

 

将jre设置成与workspace一样或设置Execution environment为1.7及以上，重新生成jar包即可。