Changing to Java 11 from Java 8

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1

I want to change to Java 11 from Java 8 in OS Leap 15.2. I successfully installed OpenJDK 11. The alternatives evidently were internally run so that Java 11 is now the alternative. However a number of Java environment variables, including JAVA_BIN_DIR, JAVA_HOME, and JAVA_ROOT still point to Java 8, while JRE_HOME points to Java 11. Do I just change these in my .profile to permanently affect a change or was there some other thing that is, or was, supposed to happen ?

2

Hi
I would have thought update-alternatives to take care of it, those look like manual entries not the defaults of JAVA_ROOT, JAVA_HOME and JAVA_BINDIR?

I see;


Tumbleweed
env | grep JAVA

JAVA_ROOT=/usr/lib64/jvm/jre-openjdk
JAVA_HOME=/usr/lib64/jvm/jre-openjdk
JAVA_BINDIR=/usr/lib64/jvm/jre-openjdk/bin

/usr/lib64/jvm/jre-openjdk/bin/java -version

openjdk version "11.0.8" 2020-07-14
OpenJDK Runtime Environment (build 11.0.8+10-suse-1.3-x8664)
OpenJDK 64-Bit Server VM (build 11.0.8+10-suse-1.3-x8664, mixed mode)

Leap 15.2
env | grep JAVA

JAVA_ROOT=/usr/lib64/jvm/jre-11-openjdk
JAVA_HOME=/usr/lib64/jvm/jre-11-openjdk
JAVA_BINDIR=/usr/lib64/jvm/jre-11-openjdk/bin

/usr/lib64/jvm/jre-11-openjdk/bin/java -version

openjdk version "11.0.8" 2020-07-14
OpenJDK Runtime Environment (build 11.0.8+10-suse-lp152.2.3.1-x8664)
OpenJDK 64-Bit Server VM (build 11.0.8+10-suse-lp152.2.3.1-x8664, mixed mode)
3

I have no entries for those environment variables in my .profile. I ran “sudo alternatives --config java” but java had evidently already been set to 11 rather than 8 after I installed the openjdk-11. So I have no idea where those environment variables come from. They don’t come from me.

4

Java 11 is in default Leap 15.2 install. You need to provide more details what you are trying to do and why.

a number of Java environment variables, including JAVA_BIN_DIR, JAVA_HOME, and JAVA_ROOT still point to Java 8, while JRE_HOME points to Java 11.

What about actually showing them instead of describing what you have seen?

It is not really a rocket science:

grep -r JAVA /etc/profile.d

Show list of installed java versions.