title: tabula-py CalledProcessError: Command '['java', '-jar'
body: <p>I am trying to use tabula-py to convert pdfs into tables when I run the following command </p>
  
  <pre><code>x=tabula.read_pdf("/Users/Rexon/PycharmProjects/UNFCCC_pdftocsv/Australia Data.pdf", output_format='Dataframe')
  </code></pre>
  
  <p>This is the error message</p>
  
  <pre><code>Exception in thread "main" java.lang.UnsupportedClassVersionError: technology/tabula/CommandLineApp : Unsupported major.minor version 51.0
      at java.lang.ClassLoader.defineClass1(Native Method)
      at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
      at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
      at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
      at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
      at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
      at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
      at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
  
  Traceback (most recent call last):
  File "&lt;input&gt;", line 1, in &lt;module&gt;  
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/tabula/wrapper.py", line 75, in read_pdf
      output = subprocess.check_output(args)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 219, in check_output
      raise CalledProcessError(retcode, cmd, output=output)
   CalledProcessError: Command '['java', '-jar', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/tabula/tabula-1.0.1-jar-with-dependencies.jar', '--pages', '1', '--guess', '/Users/Rexon/PycharmProjects/UNFCCC_pdftocsv/Australia Data.pdf']' returned non-zero exit status 1
  </code></pre>