We Keep Coding

Issue running tensorflow with java

I am having some issues running tensorflow with java. I am using CUDA 8 with CuDNN 6.
I tried following the quickstart instructions located here: https://www.tensorflow.org/install/install_java and get the following error message when I attempt to run the example java program:
java -cp libtensorflow-1.4.0.jar:. -Djava.library.path=./jni HelloTF
Exception in thread "main" java.lang.UnsatisfiedLinkError: Cannot find TensorFlow native library for OS: linux, architecture: x86_64. See https://github.com/tensorflow/tensorflow/tree/master/tensorflow/java/README.md for possible solutions (such as building the library from source). Additional information on attempts to find the native library can be obtained by adding org.tensorflow.NativeLibrary.DEBUG=1 to the system properties of the JVM.
at org.tensorflow.NativeLibrary.load(NativeLibrary.java:75)
at org.tensorflow.TensorFlow.init(TensorFlow.java:66)
at org.tensorflow.TensorFlow.<clinit>(TensorFlow.java:70)
at org.tensorflow.Graph.<clinit>(Graph.java:258)
at HelloTF.main(HelloTF.java:8)
The jni directory contains the following:
libtensorflow_framework.so
libtensorflow_jni.so
LICENSE
I then tried installing the binaries from source as suggested here:
https://github.com/tensorflow/tensorflow/blob/master/tensorflow/java/README.md
This is the output from setting: org.tensorflow.NativeLibrary.DEBUG=1
org.tensorflow.NativeLibrary: tryLoadLibraryFailed: /path/to/jni/libtensorflow_jni.so: libcublas.so.8.0: cannot open shared object file: No such file or directory
org.tensorflow.NativeLibrary: jniResourceName: org/tensorflow/native/linux-x86_64/libtensorflow_jni.so
org.tensorflow.NativeLibrary: frameworkResourceName: org/tensorflow/native/linux-x86_64/libtensorflow_framework.so
But I still get the same error message when I try and run the example Java program.
What am I doing wrong??
Any help would be greatly appreciated!

The error
Cannot find TensorFlow native library for OS: linux, architecture: x86_64.
is clearly stating that the library is not visible to your software.
To make it available to the Java class, try doing like that (in the same shell obviously):
export LD_LIBRARY_PATH=/the/absolute/path/to/your/library
java -cp libtensorflow-1.4.0.jar:. -Djava.library.path=./jni HelloTF
also ensure you're running the java command from the same directory which contains the /jni directory.

For those landing here and facing the same issue.
You are probably trying to run your program from eclipse. Then, you have to go to Run configurations > Arguments and pass this arguments:
Program arguments -> models/
images/example-400x288.jpg
VM Arguments -> -Djava.library.path=./jni
like in this screenshot:

When people (like myself) come from python to java world, everything is strange! here is how I solved my problem regarding all linking errors:
I assumed you already have simple hello Tensorflow project, explained here
Download and copy tensorflow JNI files to :/usr/lib/tensorflow
Download and copy desired version of tensorflow Lib jar file to: /usr/lib/tensorflow
Compile with java
Compile java file
javac -cp /usr/lib/tensorflow/libtensorflow-1.14.0.jar HelloTensorFlow.java
run java file:
java -cp /usr/lib/tensorflow/libtensorflow-1.14.0.jar:. -Djava.library.path=/usr/lib/tensorflow/ HelloTensorFlow
use MAVEN
First we should export LD_LIBRARY_PATH:
export LD_LIBRARY_PATH=/usr/lib/tensorflow
Then run maven build command:
mvn -q compile exec:java
I hope it helps you

Failed to run java in remote command line with external jar file

I want to run my Java code in remote server with external jar file. I referred to this tutorial and run IntelliJ IDE to generate a jar file of my whole project. Now I can run the following code in local terminal successfully.
javac -cp /Users/natsuapo/out/artifacts/main_jar/main.jar: new_server_try.java
java -cp /Users/natsuapo/out/artifacts/main_jar/main.jar: new_server_try
The code will run successfully. However, when I try the same thing in server. The compile process can be finished without any errors or warnings.
javac -cp /Users/natsuapo/out/artifacts/main_jar/main.jar: new_server_try.java
I have checked that the class file new_server_try.class is generated in the directory.
However the second step will return error as Could not find or load main class new_server_try and I am not sure why this happens.

on the second command try giving the full package name .. like shown below
java -cp "/Users/natsuapo/out/artifacts/main_jar/main.jar:lib/*" my.package.MainClass
also with operating system the command differs, check below
Windows
java -cp "Test.jar;lib/*" my.package.MainClass
Unix
java -cp "Test.jar:lib/*" my.package.MainClass

Why exec-maven-plugin fails while java console command works?

This problem has arisen while working with the Java Chromium Embedded Framework (JCEF).
The JCEF uses a native SO library (libcef.so) and a SO library for the JNI bindings (libjcef.so). I believe the embedded Chromium looks for a file named icudtl.dat next to it, i.e. in the same directory that the libraries reside.
For the following explanation, asume that all those required files are in the same directory, named jcef_libs.
I wrote a test application using JCEF. After compiling, if I execute it with the java command, i.e.
$ export LD_LIBRARY_PATH=/path/to/jcef_libs
$ java -cp src/main/java:/path/to/maven/repo/jcef.jar:/path/to/maven/repo/jogl-all/2.2.4/*:/path/to/maven/repo/gluegen-rt/2.2.4/* tests.simple.MainFrame
it works flawlessly.
On the other hand, using the exec-maven-plugin raises a fatal error, due to not finding the named icudtl.dat file. The POM file is configured to use exactly the same artifacts as the java command does.
$ mvn exec:java -Dexec.mainClass="tests.simple.MainFrame"
[1201/123038:FATAL:content_main_runner.cc(721)] Check failed: base::i18n::InitializeICU().
I have tested the java command with the icudtl.dat file removed from the jcef_libs directory, experiencing the same error, i.e. the error raises only when the icudtl.dat is not found.
Any help will be appreciated.
UPDATE
I have been tracing what maven does under the hood. The failing mvn command above executes this internally:
java -classpath /usr/share/maven2/boot/classworlds.jar -Dclassworlds.conf=/usr/share/maven2/bin/m2.conf -Dmaven.home=/usr/share/maven2 org.codehaus.classworlds.Launcher "exec:java" "-Dexec.mainClass=tests.simple.MainFrame"
I.e. it executes my test application through a launcher. I don't know where this launcher is going to execute my application but, again, I need the icudtl.dat in that directory.
Any idea how could I workaround this?

calling a java program from CentOS 7 terminal

I am using the code from this tutorial to test the JDBC connection. I changed the name of the class to TestJDBC and I altered the database name and query, but otherwise it is identical. When I run the class as a Java application from within eclipse on my devbox, the program runs properly. However, when I copy the file to /home/username/ on a remote CentOS 7 server, typing java TestJDBC.java into the terminal produces the following error:
Error: Could not find or load main class TestJDBC.java
I also the same error when I try java TestJDBC and when I upload the .class file in addition to just the .java file. What else do I need to do in order to call the Java class from the CentOS 7 terminal?
Note that javac TestJDBC.java results in -bash: javac: command not found. And I did try java somepackage.TestJDBC with same results of Error: Could not find or load main class TestJDBC.java as above.
ANSWER NOTE: The answer required getting the development version of openJDK using yum. The PATH variable was not part of the solution. However, I am marking the answer below as accepted because the user who submitted it contributed substantially to the solution.

You should be able to run it after compiling it
javac TestJDBC.java
java TestJDBC
Note that you do not need to add .class when running it from the commandline.
If this still does not work, please paste your code.
EDIT after request
So you've now stated that you're missing javac from your PATH. I'll show you how to add it:
$> export JAVA_HOME=/path/to/jdk/jdk.1.8.0_20
$> export PATH=$PATH:$JAVA_HOME/bin
Verify by running
javac -version
It should print something like
javac 1.8.0_20

Cross-compile java applications

I am working on an embedded system with openwrt root files system and linux kernel.
I have compiled the trunk, no problem with that. I have installed the Java resources in /usr/bin, /usr/lib and /usr/share, but I haven't been able to compile some simple programs that I have done in Eclipse. I have used javac to compile a hello world and I obtain the .class file but when I try to execute the helloworld.class file in my embedded system with:
java helloworld.class
it does nothing, it just says:
/usr/bin/java: line 1: syntax error: unexpected word (expecting ")")
When I execute this in my computer it runs, so I guess it is because I have to cross-compile the java files, so how can I do that?

The problem is not with your class, but with a syntax error in the /usr/bin/java script - try cat /usr/bin/java

Just try the java command withoud .class extension like
java helloworld