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Date: Sat, 5 Sep 2009 00:00:58 +0100
Message-ID: <e2e029610909041600s3c117d71qa064ab440eea807f@mail.gmail.com>
Subject: Re: Creating Multinomial Random numbers with Mahout
From: Sean Owen <srowen@gmail.com>
To: mahout-user@lucene.apache.org
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Well, sounds like you are loading classes that need Hadoop, and you
have not put Hadoop in your classpath.

These questions aren't particularly specific to Mahout -- I think
you'd benefit from learning a bit more about how Java works first.
It'll get you past a lot of small issues like this.

On Fri, Sep 4, 2009 at 11:55 PM, Sven Boekhoff<sven@boekhoff.info> wrote:
> It does nor work.
> It throws the error:
>
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/apache/hadoop/io/Writable
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.lang.ClassLoader.defineClass1(Native M=
ethod)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.lang.ClassLoader.defineClass(ClassLoad=
er.java:621)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at
> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.net.URLClassLoader.defineClass(URLClas=
sLoader.java:260)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.net.URLClassLoader.access$000(URLClass=
Loader.java:56)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.net.URLClassLoader$1.run(URLClassLoade=
r.java:195)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.security.AccessController.doPrivileged=
(Native Method)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.net.URLClassLoader.findClass(URLClassL=
oader.java:188)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.lang.ClassLoader.loadClass(ClassLoader=
.java:307)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at sun.misc.Launcher$AppClassLoader.loadClass(=
Launcher.java:301)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.lang.ClassLoader.loadClass(ClassLoader=
.java:252)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.lang.ClassLoader.loadClassInternal(Cla=
ssLoader.java:320)
> Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.io.Writabl=
e
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.net.URLClassLoader$1.run(URLClassLoade=
r.java:200)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.security.AccessController.doPrivileged=
(Native Method)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.net.URLClassLoader.findClass(URLClassL=
oader.java:188)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.lang.ClassLoader.loadClass(ClassLoader=
.java:307)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at sun.misc.Launcher$AppClassLoader.loadClass(=
Launcher.java:301)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.lang.ClassLoader.loadClass(ClassLoader=
.java:252)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0at java.lang.ClassLoader.loadClassInternal(Cla=
ssLoader.java:320)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0... 12 more
> Could not find the main class: Main. =C2=A0Program will exit.
>
> Do I need the hadoop library? This is not written in the requirements,...
>
>
> Sean Owen wrote:
>>
>> I think you probably want to study basic Java first then or you're
>> going to run into a lot more confusion.
>>
>> Vector probabilities =3D new SparseVector();
>>
>> is what you want. Interfaces and instantiating objects are the very
>> basics of Java.
>>
>> On Fri, Sep 4, 2009 at 5:30 PM, Sven Boekhoff<sven@boekhoff.info> wrote:
>>>
>>> I never worked with interfaces.
>>> And i also don't know what "instantiate an implementation" means.
>>> How does it look like?
>>>
>>> Sean Owen wrote:
>>>>
>>>> Yes, Vector is an interface! You need to instantiate an implementation
>>>> like DenseVector.
>>>>
>>>> On Fri, Sep 4, 2009 at 5:25 PM, Sven Boekhoff<sven@boekhoff.info> wrot=
e:
>>>>>
>>>>> But i cant create an Vector object:
>>>>>
>>>>> Vector probabilities =3D new Vector();
>>>>>
>>>>> gives an error.
>>>>>
>