*** JAVA_HOME is not a valid path, ignoring
Java interpreter : /usr/bin/java
Java version     : 1.8.0_161
Java home path   : /usr/lib/jvm/java-8-oracle/jre
Java compiler    : /usr/bin/javac
Java headers gen.: /usr/bin/javah
Java archive tool: /usr/bin/jar
trying to compile and link a JNI program
detected JNI cpp flags    : -I$(JAVA_HOME)/../include -
I$(JAVA_HOME)/../include/linux
detected JNI linker flags : -L$(JAVA_HOME)/lib/amd64/server -ljvm
gcc -std=gnu99 -I/usr/share/R/include -DNDEBUG -I/usr/lib/jvm/java-8-
oracle/jre/../include -I/usr/lib/jvm/java-8-
oracle/jre/../include/linux
-fpic  -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -
Werror=format-security -D_FORTIFY_SOURCE=2 -g  -c conftest.c -o
conftest.o
g++ -shared -L/usr/lib/R/lib -Wl,-Bsymbolic-functions -Wl,-z,relro -o
conftest.so conftest.o -L/usr/lib/jvm/java-8-
oracle/jre/lib/amd64/server -ljvm -L/usr/lib/R/lib -lR

JAVA_HOME        : /usr/lib/jvm/java-8-oracle/jre
Java library path: $(JAVA_HOME)/lib/amd64/server
JNI cpp flags    : -I$(JAVA_HOME)/../include -
I$(JAVA_HOME)/../include/linux
JNI linker flags : -L$(JAVA_HOME)/lib/amd64/server -ljvm
Updating Java configuration in /usr/lib/R
Done.

export JAVA_HOME=/usr/lib/jvm/java-8-oracle
export PATH=$PATH:$JAVA_HOME/bin

library(rJava)

library(rJava)
Error: package or namespace load failed for ‘rJava’:
.onLoad failed in loadNamespace() for 'rJava', details:
call: dyn.load(file, DLLpath = DLLpath, ...)
error: unable to load shared object '/home/marc/R/x86_64-pc-linux-
gnu-library/3.4/rJava/libs/rJava.so':
libjvm.so: cannot open shared object file: No such file or directory

** testing if installed package can be loaded
Error: package or namespace load failed for ‘rJava’:
.onLoad failed in loadNamespace() for 'rJava', details:
call: dyn.load(file, DLLpath = DLLpath, ...)
error: unable to load shared object '/home/marc/R/x86_64-pc-linux-
gnu-library/3.4/rJava/libs/rJava.so':
libjvm.so: cannot open shared object file: No such file or directory
Error: loading failed
Execution halted