Whats the difference between the “java” file found in “jdk1.8.0_121/bin” and the one that's in “jdk1.8.0_121/jre/bin”?

问题

I need to set the JAVA_HOME variable and I don't know which route I have to choose or if it's the same one or another.

I have two files named "java" one is into the "jdk/bin" folder and the another one is into "jdk/jre/bin" folder. What's the difference between them? Because searching over internet I see that there are people using one and another people using the other.

回答1:

Whats the difference between the java file found in jdk1.8.0_121/bin and the one that's in jdk1.8.0_121/jre/bin?

There is no difference in recent versions of Java; e.g. Java 8 or later. I have heard that there were small differences in older versions.

So the route for JAVA_HOME in the /etc/environment where should be pointing at?

The JAVA_HOME variable should point to the Java installation directory; i.e. jdk1.8.0_121 in your case.

If you are configuring the PATH variable to explicitly contain a Java bin directory¹, you would normally use jdk1.8.0_121/bin so that the development tools are on the command search path.

Note that JAVA_HOME and PATH serve different purposes.

• JAVA_HOME is used to tell 3rd-party tools where the Java installation is.
• PATH is used by the shell to resolve command names.

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^{1 - The other way to do it on Linux is to use the alternatives tool.}

来源：https://stackoverflow.com/questions/42406353/whats-the-difference-between-the-java-file-found-in-jdk1-8-0-121-bin-and-the