title: After the installation of the Java JDK, why do I need to install the JRE
body: <p>The JDK contains the JRE, but even after installing the JDK and setting JAVA_HOME, whenever I test Java using webstart or the <a href="http://java.com/en/download/testjava.jsp" rel="nofollow noreferrer">Java test page</a>, it says that Java is not installed. Do I need to install the JRE?</p>