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I followed https://www.guru99.com/how-to-install-java-on-ubuntu.html to install Java on my 64-bit, x86, Ubuntu 18.04 system.

When I run "java -version", I get the output :

ariba@monster:~$ java -version
java version "1.8.0_231"
Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
Java HotSpot(TM) Server VM (build 25.231-b11, mixed mode)

What does "Java HotSpot(TM) Server VM (build 25.231-b11, mixed mode)" mean? Is my JVM architecture 64-bit or 32-bit ? And what architecture of eclipse-installer should I use, then?

Ariba Siddiqui
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  • Which one did you install? x86 is 32-bit, x64 is 64-bit. I'm not sure about the HotSpot server, I'd have to look that up. – Paul T. Oct 23 '19 at 01:58
  • Possible duplicate of [Java SE 6 vs. JRE 1.6 vs. JDK 1.6 - What do these mean?](https://stackoverflow.com/questions/250517/java-se-6-vs-jre-1-6-vs-jdk-1-6-what-do-these-mean), but I didn't actually see an explanation there about 32 vs. 64 bit. – Tim Biegeleisen Oct 23 '19 at 01:58
  • Try `java -fullversion`; and I believe "Server" is **always** 64-bit. And HotSpot means you are using an Oracle JRE. – Elliott Frisch Oct 23 '19 at 01:59
  • @ElliottFrisch ```ariba@monster:~$ java -fullversion java full version "1.8.0_231-b11"``` – Ariba Siddiqui Oct 23 '19 at 02:00
  • @PaulT. x86 it is. *Facepalm* – Ariba Siddiqui Oct 23 '19 at 02:02
  • @PaulT. Any way to easily uninstall this and install the right version?? I had already wasted quite a lot of time setting this up. – Ariba Siddiqui Oct 23 '19 at 02:07
  • Looking at the information from your link, it looks like all that was done was extract the downloaded tar.gz to a directory, and then setup various environment variables? If so, then it should be a simple matter to remove the directory that was extracted previously, extract the x64 one instead, and then update the environment references for the new (x64) directory. (from step 3 onwards from that link) – Paul T. Oct 23 '19 at 02:13
  • @PaulT. There's also java,javac,javaws binaries in /usr/bin . Should I try to remove them too, or they would get overwritten as I install the new version?? – Ariba Siddiqui Oct 23 '19 at 02:18
  • Looks like your link info will update those based on step 7? – Paul T. Oct 23 '19 at 02:23
  • @PaulT. Yes, it worked – Ariba Siddiqui Oct 24 '19 at 00:23

1 Answers1

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  1. The Java HotSpot Virtual Machine is a core component of the Java SE platform. It implements the Java Virtual Machine Specification, and is delivered as a shared library in the Java Runtime Environment. So, HotSpot is an "ergonomic" JVM. Read more detail here, link.

  2. JVM architecture which you post in the question is 32-bit. You can get 64-Bit info in the output if you JDK is 64-bit architecture.

    λ java -version                                                  
java version "1.8.0_101"                                         
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)            
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

  3. Just getting the latest 64-bit version eclipse. The architecture of eclipse-installer depends on your system architecture.

Holinc
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