get current jre's file path

Suppose we have two java applications A and B. Application A will call application B. Application A has started, however when A calls B, I don't know the jav开发者_如何学Goa_home or any other jre path, I want to get which jre application A is run on, return the jre's execution file's path, is this possible?

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You can get the installation directory for the JRE by requesting the system propertie java.home:

String jrePath = System.getProperty("java.home");

More on System Properties here.