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how to change the java path that is being referenced

I had had previously installed java on my mac. I just downloaded a new version of java from their website. when i run java -version in my terminal I get this
omars-mbp:local omarjandali$ java -version
java version "12.0.1" 2019-04-16
Java(TM) SE Runtime Environment (build 12.0.1+12)
Java HotSpot(TM) 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing)
omars-mbp:local omarjandali$
I want delete the version above and have to point it to the new java version that I just downloaded which is
version 8: (build 1.8.0_211-b12)
how can i redirect it accordingly

Unexplainable differences between Java on OSX and Blade VPS

I'm developing a Tomcat Web Application. I'm using apache-tomcat-9.0.10 on both my development machine (Mac OS High Sierra) and my Blade VPS (Debian 8.1). Both give the following output on java -version:
Local:
java version "10.0.1" 2018-04-17 Java(TM) SE Runtime Environment 18.3
(build 10.0.1+10) Java HotSpot(TM) 64-Bit Server VM 18.3 (build
10.0.1+10, mixed mode) Evert-Jans-MacBook-Pro:apache-tomcat-9.0.10
Remote:
java version "10.0.1" 2018-04-17 Java(TM) SE Runtime Environment 18.3
(build 10.0.1+10) Java HotSpot(TM) 64-Bit Server VM 18.3 (build
10.0.1+10, mixed mode)
The Java settings are equal on both my Local machine and the remote VPS.
Yet, Locally it works but the remote server gives a 'page can’t be found error'.
Any ideas? Please let me know.

I solved the issue. I didn't upload the Lucene index which the app expected under/usr/local/index/.
Apache Tomcat could have given a more descriptive error than 404, which caused me to go and seek in the wrong direction.

What are the supported Java FX Mouse events on ARM Architecture?

I have compiled a Java FX application on windows platform using e(fx)clipse build
JDK version on Windows:
java version "1.8.0_31"
Java(TM) SE Runtime Environment (build 1.8.0_31-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.31-b07, mixed mode)
I need to deploy the same application on Raspberry Pi. It sports an ARM v6 Architecture.
I am using 2014-12-24-wheezy-raspbian disribution with 256/256MB Memory split.
Java build tested on the platform:
Default package:
java version "1.8.0"
Java(TM) SE Runtime Environment (build 1.8.0-b132)
Java HotSpot(TM) Client VM (build 25.0-b70, mixed mode)
Java SE Embedded
java version "1.8.0"
Java(TM) SE Runtime Environment (build 1.8.0-b132)
Java HotSpot(TM) Client VM (build 25.0-b70, mixed mode)
Issues Facing:
Java FX runs in Full Screen Mode with blocking all the other displays
Mouse.Drag events don't work.
Dialog, blocks the application.
Windows close,minimize options are not visible/disabled
Solutions tried
Changed the Memory split
Result: Nicer FX Graphics
Added dwg_ota.speed=1 (Changes USB bus speed from 480Mb/s to 12Mb/s)
Result: No Change
Is there any way where in I can get Mouse Drag events to work? Please do suggest. Where should I report the above bugs regarding Java FX on ARM Platform?

Java URL("file://") doesn't work on Windows XP

For some reason the following code doesn't work on Windows XP.
new URL("file://" + tempfile.getAbsolutePath());
I'm using Java 1.6.
Java(TM) SE Runtime Environment (build 1.6.0_31-b05)
Java HotSpot(TM) Client VM (build 20.6-b01, mixed mode, sharing)
However, the same code just works fine in OS X (Lion) and Java 1.6
java version "1.6.0_29"
Java(TM) SE Runtime Environment (build 1.6.0_29-b11-402-11M3527)
Java HotSpot(TM) 64-Bit Server VM (build 20.4-b02-402, mixed mode)
Linux (Linux 2.6.32-38-generic #83-Ubuntu x86_64 GNU/Linux) with Java 1.6
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode)
Based on this the above code should work.

On the localhost the URL looks like:
file:///Folder
Very important the third slash...
On Windows the Folder looks like:
file:///C:/path/

What is the problem with File.toURI().toURL()? Why reinvent the wheel?

The following code should avoid all the hassles
new File(tempfile.getAbsolutePath()).toURI().toURL()

Setting HotSpot(TM) Server VM in Java 1.6 environment

I have a question related to setting Java hotspot server VM in java 1.6
is there any way to set Java HotSpot Server VM in java 1.6 environment? When i run following command
java -version
it's showing as below,
java version "1.6.0_16"
Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
Java HotSpot(TM) Client VM (build 14.2-b01, mixed mode, sharing)
I want this has to be displayed as below in third line.
Java HotSpot(TM) Server VM (build 14.2-b01, mixed mode, sharing)
Is there any command so that whenever we run java -version, it will always show Hotspot Server VM rather Client VM??
Thanks
Robert.

Add the -server flag:
java -version -server
outputs
java version "1.6.0_21"
Java(TM) SE Runtime Environment (build 1.6.0_21-b06)
Java HotSpot(TM) Server VM (build 17.0-b16, mixed mode)

You should try 'java -server -version' instead. You will need to have the server hotspot compiler installed or use that on the JRE that comes bundled with the JDK (which comes with server hotstpot).

I seem to remember reading somewhere that the JVM will start in server mode automatically if the system meets certain specifications in terms of number of processes and amount of memory. Can't remember the details or find the info though.
Edit: Found some info here
http://download.oracle.com/javase/6/docs/technotes/guides/vm/server-class.html
Server class machine is > 2Gb RAM and > 2 processors.

Simply add the '-server' flag !