The Altair Community is migrating to a new platform to provide a better experience for you. The RapidMiner Community will merge with the Altair Community at the same time. In preparation for the migration, both communities are on read-only mode from July 15th - July 24th, 2024. Technical support via cases will continue to work as is. For any urgent requests from Students/Faculty members, please submit the form linked here.
Options

"HTML Content Extraction Error"

mgstickmgstick Member Posts: 5 Contributor II
edited May 2019 in Help
I'm crawling the web and then attempting to extract the content of the downloaded HTML pages using the Web Mining -> HTML Processing -> Extract Content operator.

My process successfully crawls the web and writes the HTML pages to disk; it also processes the Documents data set returned by the crawler using the Loop Collection operator, or at least seems to execute the Unescape HTML Document operator on each Document. The sub-process in the Loop Collection operator begins with the Unescape HTML Document operator and is then supposed to process each Document using the Extract Content operator. When it gets to this point I get the following error (see below for full error message output):

          Process failed: org/apache/commons/lang/StringEscapeUtils (ProcessThread.run())
            java.lang.NoClassDefFoundError: org/apache/commons/lang/StringEscapeUtils

I've downloaded the Apache Commons Lang jar file (commons-lang-2.5.jar) and attempted to make it available for RapidMiner to use; but with no luck. I tried adding it to my default CLASSPATH, adding it to the CLASSPATH from within my Terminal via the Set command, and I've tried adding it to the CLASSPATH explicitly on the RapidMiner execution command line i.e. java -classpath lib/commons-lang-2.5.jar -jar lib/rapidminer.jar and yet I still get the java.lang.NoClassDefFoundError: org/apache/commons/lang/StringEscapeUtils error.

I don't know what to try next. Any help would be greatly appreciated.

Thanks in advance for your help.


2010-10-28 11:58:03 SEVERE: Process failed: org/apache/commons/lang/StringEscapeUtils (ProcessThread.run())
  java.lang.NoClassDefFoundError: org/apache/commons/lang/StringEscapeUtils
      com.rapidminer.operator.web.html.HTMLTextExtractionOperator.doWork(HTMLTextExtractionOperator.java:324)
      com.rapidminer.operator.text.io.AbstractTokenProcessor.doWork(AbstractTokenProcessor.java:60)
      com.rapidminer.operator.Operator.execute(Operator.java:768)
      com.rapidminer.operator.execution.SimpleUnitExecutor.execute(SimpleUnitExecutor.java:51)
      com.rapidminer.operator.ExecutionUnit.execute(ExecutionUnit.java:709)
      com.rapidminer.operator.collections.CollectionIterationOperator.doWork(CollectionIterationOperator.java:90)
      com.rapidminer.operator.Operator.execute(Operator.java:768)
      com.rapidminer.operator.execution.SimpleUnitExecutor.execute(SimpleUnitExecutor.java:51)
      com.rapidminer.operator.ExecutionUnit.execute(ExecutionUnit.java:709)
      com.rapidminer.operator.OperatorChain.doWork(OperatorChain.java:368)
      com.rapidminer.operator.Operator.execute(Operator.java:768)
      com.rapidminer.Process.run(Process.java:863)
      com.rapidminer.Process.run(Process.java:770)
      com.rapidminer.Process.run(Process.java:765)
      com.rapidminer.Process.run(Process.java:755)
      com.rapidminer.gui.ProcessThread.run(ProcessThread.java:65)
Caused by:
  java.lang.ClassNotFoundException: org.apache.commons.lang.StringEscapeUtils
      java.net.URLClassLoader$1.run(URLClassLoader.java:202)
      java.security.AccessController.doPrivileged(Native Method)
      java.net.URLClassLoader.findClass(URLClassLoader.java:190)
      java.lang.ClassLoader.loadClass(ClassLoader.java:307)
      java.lang.ClassLoader.loadClass(ClassLoader.java:248)
      com.rapidminer.operator.web.html.HTMLTextExtractionOperator.doWork(HTMLTextExtractionOperator.java:324)
      com.rapidminer.operator.text.io.AbstractTokenProcessor.doWork(AbstractTokenProcessor.java:60)
      com.rapidminer.operator.Operator.execute(Operator.java:768)
      com.rapidminer.operator.execution.SimpleUnitExecutor.execute(SimpleUnitExecutor.java:51)
      com.rapidminer.operator.ExecutionUnit.execute(ExecutionUnit.java:709)
      com.rapidminer.operator.collections.CollectionIterationOperator.doWork(CollectionIterationOperator.java:90)
      com.rapidminer.operator.Operator.execute(Operator.java:768)
      com.rapidminer.operator.execution.SimpleUnitExecutor.execute(SimpleUnitExecutor.java:51)
      com.rapidminer.operator.ExecutionUnit.execute(ExecutionUnit.java:709)
      com.rapidminer.operator.OperatorChain.doWork(OperatorChain.java:368)
      com.rapidminer.operator.Operator.execute(Operator.java:768)
      com.rapidminer.Process.run(Process.java:863)
      com.rapidminer.Process.run(Process.java:770)
      com.rapidminer.Process.run(Process.java:765)
      com.rapidminer.Process.run(Process.java:755)
      com.rapidminer.gui.ProcessThread.run(ProcessThread.java:65)
2010-10-28 11:58:03 SEVERE: Here:          Process[1] (Process)
          subprocess 'Main Process'
            +- Crawl Web[1] (Crawl Web)
            +- Multiply[1] (Multiply)
            +- Data to Documents[1] (Data to Documents)
            +- Loop Collection[1] (Loop Collection)
          subprocess 'Iteration'
                  +- Unescape HTML Document[1] (Unescape HTML Document)
      ==>        +- Extract Content[1] (Extract Content)
                  +- Write Document[0] (Write Document) (ProcessThread.run())
Tagged:

Answers

  • Options
    mgstickmgstick Member Posts: 5 Contributor II
    Hi,

    I found a way to add jar files to RapidMiner's CLASSPATH by modifying the RapidMinerGUI script and then launching RapidMiner using that script.

    Thanks (though none replied :(
  • Options
    landland RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 2,531 Unicorn
    Hi,
    sorry for that, but we are quite busy these days...

    One question: Do you have the latest RapidMiner AND TextProcessingExtension version installed?

    Greetings,
      Sebastian
Sign In or Register to comment.