The alternatives system and the system administrator together determine which actual file is referenced by this generic name. The generic name is not a direct symbolic link to the selected alternative. AlternativesĪccording to, alternatives ‘make it possible for several programs fulfilling the same or similar functions to be installed on a single system at the same time. A generic name in the filesystem is shared by all files providing interchangeable functionality. In a many software development environments, you may need different versions of Java, depending on different client project’s level of technology. By selecting an alternative version of Java, we control which java.exe binary executable file the system calls when the ‘java’ command is executed. These three versions are referred to as ‘alternatives’, thus the ‘alternatives’ command. There are two other Java versions also installed but not active, an Oracle 1.7.0_17 JRE version and an older 1.7.0_04 JDK version. That version is located in the ‘/usr/lib/jvm/jdk1.7.0_17’ subdirectory. In the above example, the 1.7.0_17 JDK version of Java is configured and active.
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