Running the Web Crawler with a new plugin (sample HTMLMetatagFilter)

Hi,
I tried the steps described from the guide: http://docs.oracle.com/cd/E40518_01/ias.310/ias_webcrawler/toc.htm#Running%20the%20Sample%20Web%20Crawler%20Plugin
These are the steps that I perform:
1. Open the sample plugin project with Eclipse
2. Build the sample plugin from Eclipse
https://dl.dropboxusercontent.com/u/21502321/Endeca/Captura.PNG
3. Add the pluging to the IAS lib directory (directory called with the same name of the jar, filter-htmlmetatags, which contains the jar file generated and the plugin.xml file)
4. Activate the plugin for the Web Crawler (copy the plugin.includes and plugin.excludes properties from default.xml to site.xml in both polite-crawl and non-polite-crawl directories)
5. Run the Web Crawler with a new plugin (sample plugin from the guide called HTMLMetatagFilter)
And when I run the web crawler I get the follow error:
c:\Oracle\Endeca\IAS\3.1.0\bin>web-crawler.bat -c c:\Oracle\Endeca\IAS\workspace\conf\web-crawler\polite-crawl -d 0 -s c:\Oracle\Endeca\IAS\workspace\conf\web-crawler\default\endeca.lst
INFO 2013-12-03 20:18:46,104 0 com.endeca.eidi.web.Main [main]
Reading seed URLs from: c:\Oracle\Endeca\IAS\workspace\conf\web-crawler\default\endeca.lst
INFO 2013-12-03 20:18:46,104 0 com.endeca.eidi.web.Main [main]
Seed URLs: [http://www.oracle.com/]
ERROR 2013-12-03 20:18:46,354 250 com.endeca.eidi.web.Main [main]
Crawler failed on crawler initialization. Shutting down.
java.lang.UnsupportedClassVersionError: com/endeca/eidi/web/parse/HTMLMetatagFilter : Unsupported major.minor version 51.0
 at java.lang.ClassLoader.defineClass1(Native Method)
 at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
 at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
 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 java.lang.ClassLoader.loadClass(ClassLoader.java:247)
 at org.apache.nutch.plugin.Extension.getExtensionInstance(Extension.java:156)
 at org.apache.nutch.parse.ParseFilters.getExtensionList(ParseFilters.java:47)
 at com.endeca.eidi.web.process.ExtensionInstances.<init>(ExtensionInstances.java:52)
 at org.apache.nutch.parse.ParseFilters.<init>(ParseFilters.java:33)
 at com.endeca.eidi.web.UrlProcessor.<init>(UrlProcessor.java:82)
 at com.endeca.eidi.web.Crawler.<init>(Crawler.java:81)
 at com.endeca.eidi.web.Main.main(Main.java:140)
Crawler failed on crawler initialization.
java.lang.UnsupportedClassVersionError: com/endeca/eidi/web/parse/HTMLMetatagFilter : Unsupported major.minor version 51.0
 at java.lang.ClassLoader.defineClass1(Native Method)
 at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
 at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
 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 java.lang.ClassLoader.loadClass(ClassLoader.java:247)
 at org.apache.nutch.plugin.Extension.getExtensionInstance(Extension.java:156)
 at org.apache.nutch.parse.ParseFilters.getExtensionList(ParseFilters.java:47)
 at com.endeca.eidi.web.process.ExtensionInstances.<init>(ExtensionInstances.java:52)
 at org.apache.nutch.parse.ParseFilters.<init>(ParseFilters.java:33)
 at com.endeca.eidi.web.UrlProcessor.<init>(UrlProcessor.java:82)
 at com.endeca.eidi.web.Crawler.<init>(Crawler.java:81)
 at com.endeca.eidi.web.Main.main(Main.java:140)
I do not understand why this error appears and why there is a problem with version?? How can I make this sample work?
Note: this is my configuration system:
* OEID 3.1
* IAS installed with Jetty
* Windows 7 x64
* Any server running (endeca_server_domain, endeca_studio_domain, endeca_ps_domain)
* Endeca IAS service running

I'm using Java 6 update 43 for all Endeca 3.1 products, because is the recomended version to use. I did an installation with Java 7u45 in other machine and Endeca did not works well. (https://forums.oracle.com/thread/2607872)
But I know when is installed the Integrator, it has integrated Java 7. And I think when I generate the .jar file from the Integrator, it has data with Java 7, so, when I run the Web Crawler with this plugin from the command prompt of Windows, the crawler Installation works with Java 6 (which I already installed).
So, what should I do if all endeca 3.1 (except Integrator) has to work with java 6u43 and the Integrator generates files with java 7?

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