Deploy the Java project on the server to install JDK or JRE

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The premise that only JRE is installed on the server:

1. When published to the server, all files are compiled files, including JSP files

2. Do not modify it directly on the server at a later stage (resulting in no recompilation after modification)

If the deployed projects are compiled and redeployed, you can only install JRE if you don't modify it directly on the server.

Note: if there is an uncompiled Java file that needs to be compiled or modified on the server, JDK should be installed on the server.

Benefits of installing JDK on a server:

1. Java files can be compiled to facilitate later maintenance.

2. Ensure the stable operation of JSP files after modification.

All in all, in order to avoid this and that kind of trouble in the future, JDK should be installed on the server. Because after all, post-project maintenance is the main thing.

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