title: Unable to run a basic GraphFrames example
body: <p>Trying to run a simple GraphFrame example using pyspark.</p>
  
  <p>spark version : 2.0</p>
  
  <p>graphframe version : 0.2.0</p>
  
  <p>I am able to import graphframes in Jupyter:</p>
  
  <pre><code>from graphframes import GraphFrame
  GraphFrame
  graphframes.graphframe.GraphFrame
  </code></pre>
  
  <p>I get this error when I try and create a GraphFrame object:</p>
  
  <pre><code>---------------------------------------------------------------------------
  Py4JJavaError                             Traceback (most recent call last)
  &lt;ipython-input-23-2bf19c66804d&gt; in &lt;module&gt;()
  ----&gt; 1 gr_links = GraphFrame(df_web_page, df_parent_child_link)
  
  /Users/roopal/software/graphframes-release-0.2.0/python/graphframes/graphframe.pyc in __init__(self, v, e)
       60         self._sc = self._sqlContext._sc
       61         self._sc._jvm.org.apache.spark.ml.feature.Tokenizer()
  ---&gt; 62         self._jvm_gf_api = _java_api(self._sc)
       63         self._jvm_graph = self._jvm_gf_api.createGraph(v._jdf, e._jdf)
       64 
  
  /Users/roopal/software/graphframes-release-0.2.0/python/graphframes/graphframe.pyc in _java_api(jsc)
       32 def _java_api(jsc):
       33     javaClassName = "org.graphframes.GraphFramePythonAPI"
  ---&gt; 34     return jsc._jvm.Thread.currentThread().getContextClassLoader().loadClass(javaClassName) \
       35             .newInstance()
       36 
  
  /Users/roopal/software/spark-2.0.0-bin-hadoop2.7/python/lib/py4j-0.10.1-src.zip/py4j/java_gateway.py in __call__(self, *args)
      931         answer = self.gateway_client.send_command(command)
      932         return_value = get_return_value(
  --&gt; 933             answer, self.gateway_client, self.target_id, self.name)
      934 
      935         for temp_arg in temp_args:
  
  /Users/roopal/software/spark-2.0.0-bin-hadoop2.7/python/pyspark/sql/utils.pyc in deco(*a, **kw)
       61     def deco(*a, **kw):
       62         try:
  ---&gt; 63             return f(*a, **kw)
       64         except py4j.protocol.Py4JJavaError as e:
       65             s = e.java_exception.toString()
  
  /Users/roopal/software/spark-2.0.0-bin-hadoop2.7/python/lib/py4j-0.10.1-src.zip/py4j/protocol.py in get_return_value(answer, gateway_client, target_id, name)
      310                 raise Py4JJavaError(
      311                     "An error occurred while calling {0}{1}{2}.\n".
  --&gt; 312                     format(target_id, ".", name), value)
      313             else:
      314                 raise Py4JError(
  
  Py4JJavaError: An error occurred while calling o138.loadClass.
  : java.lang.ClassNotFoundException: org.graphframes.GraphFramePythonAPI
      at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:497)
      at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:237)
      at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
      at py4j.Gateway.invoke(Gateway.java:280)
      at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:128)
      at py4j.commands.CallCommand.execute(CallCommand.java:79)
      at py4j.GatewayConnection.run(GatewayConnection.java:211)
      at java.lang.Thread.run(Thread.java:745)
  </code></pre>
  
  <p>The python code tries to read the java class (in the jar) I guess, but cant seem to find it.
  Any suggestions how to fix this?</p>