mjhjmtu

I am trying to get Janusgraph working on OpenSuse Leap 42.3 but I'm running into a multitude of problems.

My understanding is that JanusGraph invokes other Java dependencies, including gremlin & cassandra. I've tried from my account and from root but I gather from subsequent reading that running janusgraph.sh from root is either deprecated or impossible.

I think that my Java environment variables are wrong and and running env reveals a bunch of variables relating to java and I don't know how or where they're generated or declared. I'd like to set these up in way that they're common across ALL accounts, which I think may be possible somehow, using /etc/environment?

Here's the output from env | grep J + other manual extracts (all the following are run from my normal bash account, not root)

JRE_HOME=/usr/lib64/jvm/jre-1.8.0-openjdk/jre/bin/java
JAVA_BINDIR=/usr/lib64/jvm/java/bin
JAVA_HOME=/usr/bin/
JDK_HOME=/usr/lib64/jvm/java
JAVA_ROOT=/usr/lib64/jvm/java
CASSANDRA_HOME=/opt/apache-cassandra-3.11.3/bin/
PATH=/home/me/adb-fastboot/platform-tools:/home/me/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:/home/me/bin:/usr/lib64/jvm/jre-1.8.0-openjdk/bin/java:/usr/lib64/jvm/jre-1.8.0-openjdk/jre/bin/java:/usr/bin/

but I think that contradicts:

alternatives --list java
/usr/lib64/jvm/jre-1.8.0-openjdk/bin/java

I've also checked:

java -version
openjdk version "1.8.0_191"
OpenJDK Runtime Environment (IcedTea 3.10.0) (build 1.8.0_191-b12 suse-30.1-x86_64)
OpenJDK 64-Bit Server VM (build 25.191-b12, mixed mode)

and to bottom out the actual location:

readlink -f /usr/bin/java
/usr/lib64/jvm/java-1.8.0-openjdk-1.8.0/jre/bin/java

and

whereis java
java: /usr/bin/java /usr/lib64/java /etc/java /usr/share/java /usr/share/man/man1/java.1.gz

Your PATH variable is messed up and I don't know why you should need JRE_HOME, JAVA_BINDIR, JDK_HOME and JAVA_ROOT. Generally you will only need the java binary in your PATH and the JAVA_HOME variable. But maybe your setup requires some of these, so I would suggest you leave them until your environment works as desired.

Allow me to dissect your PATH, remove the entries with comments:

PATH=/home/me/adb-fastboot/platform-tools:
/home/me/bin:
/usr/local/bin:
/usr/bin:
/bin:
/usr/bin/X11:
/usr/games:
/home/me/bin: # remove, already defined above
/usr/lib64/jvm/jre-1.8.0-openjdk/bin/java: # remove, java is already in /usr/bin
/usr/lib64/jvm/jre-1.8.0-openjdk/jre/bin/java: # remove, java is already in /usr/bin
/usr/bin/ # remove, already defined above

Your new PATH is:

PATH=/home/me/adb-fastboot/platform-tools:/home/me/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games

JAVA_HOME/JRE_HOME should be:

JAVA_HOME=/usr/lib64/jvm/jre-1.8.0-openjdk
JRE_HOME=$JAVA_HOME/jre

Edit: Your variables are probably exported in your ~/.bashrc or ~/.profile. Make the changes where you find them (with export before the variable name).