Installing Jupyter Notebook and Numpy in Windows

I had hard time to install Jupyter Notebook.  My machine already had Python 2.7 and after installing anaconda and trying to run 'juypter notebook' command threw python errors.

Then I tried to uninstall Python 2.7 and again let the anaconda install its own python version.  No luck.

Then finally I removed all the Python installation but forgot to remove the path variables (more on this below).  Then installed python 3.5 version (take the latest 3.5 release).

Then using pip3 install jupyter, the notebook got installed successfully.

Then running 'jupyter notebook', got an error message "Fatal Python error: Py_Initialize: unable to load the file system codec".  Upon checking the forums, one of the solution was to check the PATH and the PYTHONPATH environment variables.  Bingo..they were still referring to the older and now removed installations of Python.

Removed them and the 'jupyter notebook' brought the index page in the browser but with the 404 error.

Again, forums helped me.  It looks like there may be a bug in the jupyter version I downloaded, so if you run the 'jupyter notebook' from your root folder (c:\), then this error will happen.  This could be due to the fact that the root folder has hidden system files.   Switch to any folder, say, c:\tmp, and run the command, brings the page with the file contents of that folder.

Numpy is bit different.  Since there is no installation manager provided by numpy.org, you need to first download the binary wheel for the python version you're using.  Important: Make sure you are downloading the right version of the whl file.  if you're using Python 3.5, look for the one with the name that contains cp35.

Then go to that downloaded folder and run pip install <whl file name>.  For example, pip3 install "numpy-1.11.2+mkl-cp35-cp35m-win32.whl".  This will install the numpy package.

That's all folks!.

Using Jboss JConsole

If you're using JBoss as your app server, then you don't need to setup JDK settings for the JMX.  Instead you need to check the following: http://stackoverflow.com/questions/17105933/enabling-jmx-remote-in-jboss-6-1

Then run JBOSS_HOME/bin/jconsole.sh (or .bat for Windows).

In the "Remote" section enter the following:service:jmx:remoting-jmx://<server-name>:9999 (the default OOTB port number is 9999.  Check 'management-native' value in standalone.xml.

Then enter the username and password we created using add-user.sh (or .bat) in jboss/bin.

Using Jstatd

JVisuslVM is useful in profiling your server applications local or remote.  To profile your application, you need to run the jstatd daemon in the server your application is running.  Running jstatd is not as straightforward.  Follow these steps:

1) Create a policy file.  The policy tool is in JAVA_HOME/jre/bin.  Start policytool.exe

2) You need to provide the security policy for the tools.jar.  The tools.jar is usually in JAVA_HOME/lib.  DO NOT GIVE RELATIVE PATH such as $JAVA_HOME/lib/tools.jar.  The jstatd doesn't recognize it.  Instead provide the absolute path.

3) Click "Add Policy Entry" and enter the following in "CodeBase" text box: file:/usr/java/default/lib/tools.jar (for non-windows and also, check your java path in your machine) or "c:/Program Files (x86)/Java/jdk1.7.0_79/lib/tools.jar" (for Windows, for ex.  Use "/" for windows path also).

4) Click "Add Permission" and enter the following in "AllPermission" text box: java.security.AllPermission. Click Ok.

5) Click "Done"

6) Click File->Save and save it.

7) Copy this policy file to the remote server (if needed).

8) Go to $JAVA_HOME/lib folder.

9) Run the following: jstatd -J-Djava.security.policy=/<absolute path to the folder where the policy file is>/<policyfile name> -p1234

Note: The -p option may not  required in some cases and this value is a random value chosen.

Now run the Java VisualVM and Click on Remote and add the remote server name.  You should see  the Jstatd process.