Java 运行时环境版本 7u21 的发行说明中将 JRE 到期日期设置为 07/18/2013 是什么意思？
最佳答案
这是 Java 认为自己已过时的日期。一旦过期，它将开始提示用户升级 Java，而不管是否已发布新的 Java 版本。看来这个日期设置为下一个计划发布 + 1 个月。
注意:Java 还会调用 并下载一个文件，其中列出了最新的 Java 版本。如果 Oracle 提前发布带外补丁，他们可以立即在所有 Java 客户端上触发立即更新消息。
来自 release notes of Java 7 update 10
The JRE relies on periodic checks with an Oracle Server to determine if it (the JRE)is still considered up-to-date with all the available security fixes (above the security baseline). In the past, if the JRE was unable to contact the Oracle Server, it continued to behave as though it is still the most recent version with regard to security, for an indefinite period.
To avoid this problem, a secondary mechanism, that does not rely on external communication, has been added to the JDK 7u10. From this release onwards, all JREs will contain a hard-coded expiration date. The expiration date is calculated to end after the scheduled release of the next Critical Patch Update.
This means that JREs that are unable to contact Oracle Servers for an extended period of time, will now start offering additional protection after a reasonable period, and will not continue to behave as if they were still up-to-date with security fixes.
关于java - JRE 到期日，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16067829/