Background: Last week, I maintained an old project that has been online for two or three years, and developed and run it using an older version of JDK7. At first, I didn't ask the customer which version it was, and downloaded a JDK7 version locally. After spending a day fixing the bug, I replaced the Class file incrementally, and found that the production environment tomcat failed to start successfully. I tried the package on the local tomcat8 and found that there was no problem, so I asked the customer for the specific JDK version. The embarrassing thing is that I didn't find out how to download the historical version of the JDK for the first time, and record it here. . . .
1. Visit Oracle official website http://www.oracle.com
2. Click on the Menu menu to access the following screenshot path
3. Scroll to the bottom of the page in step 2, you can see the "Java Archive", that is, the Java archive file column, where the information of the historical JDK version is recorded for the development of old projects.
4. Click "Download" on the right side of "Java Archive" to see the following screenshot, select the JDK version you need to download
