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For logging purposes I'm getting the Java version written in log while Java program is running.
I found out that I can get the version with
System.getProperty("java.runtime.version") -> 1.8.0_202-b08
and
System.getProperty("java.version") -> 1.8.0_202
Result obviously is missing the "build" information in other but are there any other difference besides the result? Any certain cases when I should be using the first option rather than the second?
453
If you Open your JDK folder (C:\Program Files\Java\jdk1. 8.0_152) , you can find JRE there. Coming to your Question; No it is not necessary to have both JDK and JRE of same version as we don't use both at the same time.
Java™ system properties determine the environment in which you run your Java programs. They are similar to system values or environment variables in IBM® i. Starting an instance of a Java virtual machine (JVM) sets the values for the system properties that affect that JVM.
Use the system property java. version . Use the version() method of the Runtime class in Java.
The JDK and JRE versions can be different on the same computer. Multiple JDK and JRE versions are allowed on the same computer; it is better to find out which version is configured in the system classpath to run or compile the Java program.
System Property Name | System Property Content | Where Displayed in java version Output
---------------------|--------------------------|---------------------------------------
java.version | product version | Line one displays the product version
---------------------|--------------------------|---------------------------------------
java.runtime.version | product version | Line one displays the product version
| product build identifier | Line two displays the build identifier
From the J2SE SDK/JRE Version String Naming Convention documentation:
- The content of the
java.runtime.versionsystem property can be expanded (beyond that of the java.version system property) to include the build id.
It seems that the property value can therefore be equal to the java.runtime content or differentiate by the build id as already pointed out in the question.
Anyway, as previously stated in a comment to the question, the java.runtime.version property doesn't appear among the currently documented system properties.
51
One is JDK version, java.version and as the name suggest other is JRE version, R for the runtime
31
java.version is a product version information of Java Runtime environment(JRE). JRE is an implementation of the Java Virtual Machine which actually executes Java programs.
java.runtime.version is a product version along with build identifier of JRE.
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