libjvm.so is looked for in the wrong place

[maxnoe]

On travis, even with JAVA_HOME set, the library is not found.

It is actually in:

/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so

But pyjnius looks in:

/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/server/libjvm.so

[julianhess]

You need to set JDK_HOME to /usr/lib/jvm/java-8-openjdk-amd64/; setup.py does not check JAVA_HOME. See:

pyjnius/setup.py

Line 154 in afd9b42

JDK_HOME = getenv('JDK_HOME')

[maxnoe]

Why do I need to set it at all? Why not take the java(c) that's in the PATH my default?

[maxnoe]

Oh wait. It does. Neither is the problem here!

The problem is the additional amd64 in the path.

[julianhess]

You need to rebuild the package with JDK_HOME already set as above; merely setting it after building will do nothing.

I kept running into this issue too until I dug through the source and found that the path to libjvm.so gets baked in during compilation (try running strings jnius.cpython-37m-x86_64-linux-gnu.so | grep libjvm)

See here:

pyjnius/jnius/jnius_jvm_dlopen.pxi

Lines 48 to 53 in 61149f2

	IF JNIUS_PYTHON3:
	try:
	jnius_lib_suffix = JNIUS_LIB_SUFFIX.decode("utf-8")
	except AttributeError:
	jnius_lib_suffix = JNIUS_LIB_SUFFIX
	lib_path = str_for_c(os.path.join(JAVA_HOME, jnius_lib_suffix))

JNIUS_LIB_SUFFIX is defined in config.pxi, which is dynamically generated by setup.py.

[tshirtman]

hopefully this should be solved by the changes i did in the #443 #444 PR, which will provide wheels able to do this check at runtime, and try to be smarter about the lookup.

[tshirtman]

Closing as i believe this to be fixed, let us know if you still have issues.

[maxnoe]

Just commenting: the PR you linked only changes a single line of whitespace. Wrong PR?

[tshirtman]

indeed that was #444 thanks for pointing out.

[mashabelyi]

I am having the same issue with the most recent version, even after setting both JAVA_HOME and JDK_HOME to my java path: /usr/lib/jvm/java-8-oracle.

In my case pyjnius is looking in

/usr/lib/jvm/java-8-oracle/lib/server/libjvm.so

but the actual path is

/usr/lib/jvm/java-8-oracle/jre/lib/amd64/server/libjvm.so

I tried adding /usr/lib/jvm/java-8-oracle/jre/lib/amd64/server to the PATH env variable too. But still get the same error on import:

SystemError: Error calling dlopen(b'/usr/lib/jvm/java-8-oracle/lib/server/libjvm.so': b'/usr/lib/jvm/java-8-oracle/lib/server/libjvm.so: cannot open shared object file: No such file or directory'

[chemu-patent-ie]

I am also having an issue. This is a dependency for something else I'm trying to install.

My $JAVA_HOME and $JDK_HOME are correctly set. When I go to the path they point to and look for libjvm I see:

$ find . -name "libjvm*"
./jre/bin/classic/libjvm.so
./jre/bin/j9vm/libjvm.so
./jre/lib/amd64/classic/libjvm.so
./jre/lib/amd64/compressedrefs/libjvm.so
./jre/lib/amd64/default/libjvm.so
./jre/lib/amd64/j9vm/libjvm.so

No "server" directory at all.

SystemError: Error calling dlopen(b'/usr/lib/jvm/java-1.8.0-ibm-1.8.0.6.5-1jpp.1.el7.x86_64/lib/server/libjvm.so': b'/usr/lib/jvm/java-1.8.0-ibm-1.8.0.6.5-1jpp.1.el7.x86_64/lib/server/libjvm.so: cannot open shared object file: No such file or directory'

Is the problem my Java version or something else?

[tshirtman]

#520 for a tentative fix + workaround
if things go well, https://github.com/kivy/pyjnius/actions/runs/87203882 should produce wheel packages that you can test on your systems to confirm if this helps.

I added the paths you both reported, and added a system to override the value through a non standard JVM_PATH en var if that doesn't work, with a message encouraging people to report working values, hopefuly it'll allow us to understand what paths are actually used in the wild.

edit: test wheels can be found here https://github.com/kivy/pyjnius/releases/tag/issue_428-test

[tshirtman]

closing as i hope this to be fixed, if the error happens again, please open a new issue refering to this one.