🎉Community Raffle - Win $25

An exclusive raffle opportunity for active members like you! Complete your profile, answer questions and get your first accepted badge to enter the raffle.
Join and Win

IOObjectReader does not work with plugin classes

User: "Username"
Username
New Altair Community Member
Updated by Jocelyn
Hi,

I am writing a custom plugin for RM. The IOObjectReader operator does not work with IOObjects from my plugin. The operator throws a ClassNotFoundException in line 65 (I'm using the built in Java object serialization). Everything else from my plugin works without problems.

Here's the stack trace of the exception:

Exception: java.lang.ClassNotFoundException
Message: de.unidue.inf.classification.data.common.Documents
Stack trace:

  java.net.URLClassLoader$1.run(URLClassLoader.java:200)
  java.security.AccessController.doPrivileged(Native Method)
  java.net.URLClassLoader.findClass(URLClassLoader.java:188)
  java.lang.ClassLoader.loadClass(ClassLoader.java:306)
  sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
  java.lang.ClassLoader.loadClass(ClassLoader.java:251)
  java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
  java.lang.Class.forName0(Native Method)
  java.lang.Class.forName(Class.java:247)
  java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:604)
  java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575)
  java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
  java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
  java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
  java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
  com.rapidminer.operator.io.IOObjectReader.apply(IOObjectReader.java:65)
  com.rapidminer.operator.Operator.apply(Operator.java:664)
  com.rapidminer.operator.OperatorChain.apply(OperatorChain.java:377)
  com.rapidminer.operator.Operator.apply(Operator.java:664)
  com.rapidminer.Process.run(Process.java:612)
  com.rapidminer.Process.run(Process.java:582)
  com.rapidminer.Process.run(Process.java:572)
  com.rapidminer.gui.ProcessThread.run(ProcessThread.java:61)


Thanks

Find more posts tagged with

AI Studio
Developer
Sort by:
1 - 1 of 11
    User: "IngoRM"
    IngoRM
    New Altair Community Member
    Hello,

    I am assuming that you have written the object with the IOObjectWriter. Does your new IOObject extend AbstractIOObject? This is probably necessary if the generic IOObject writing and reading properly works.

    As a workaround you could of course always write a pair of Reading / Writing operators for your object yourself - but of course if would be easier to use the generic ones. So we should try to get this working.

    Cheers,
    Ingo
Quick Links