Sun 發布了 Java 5 Update 7 Java 5 Update 7 修復了Update 6 的一些bugs，與解決了一些安全問題。其中一個比較主要的bug是：之前驗證簽名過的jar非常的慢，并帶來性能降低。關于安全問題，官方提到：Prior to this update, an applet or application could specify the version of the JRE on which it would run. This has changed. All applets are executed with the latest JRE version. Unsigned Java Web Start applications that specify a version other than the latest trigger a warning, requiring explicit user permission before the application will run. Signed Java Web start applications are not affected