I am having a problem writing a Ptolemy actor and need some help.
I am writing RangeReader.java, an actor to read a range from an Excel
spreadsheet. I based it on FileReader in ptolemy.actor.lib.io. I am using
the Apache POI/HSSF from http://jakarta.apache.org/poi/index.html to read
the file. The file compiles, but when I use the actor in Vergil, I get a
NoClassDefFoundError in the line:
POIFSFileSystem fs = new POIFSFileSystem (in);
This line is straight out of the POI/HSSF samples. The file I am opening
exists. I tested with an incorrect filename and got an different exception
in a previous line.
I think the error means that it found the class at compile time, but not at
run time. Is there something I need to do so that Ptolemy will find the POI
.jar file?
I put RangeReader.java in C:\Ptolemy\ptII5.0-beta\ptolemy\actor\lib\io and I
put the POI directory in C:\Ptolemy\ptII5.0-beta. I compile with:
javac -classpath
c:\Ptolemy\ptII5.0-beta\poi\poi-2.5.1-final-20040804.jar;c:\Ptolemy\ptII5.0-
beta RangeReader.java
I'm a lifelong c/c++ programmer and new to Java. I suspect this is a simple
problem that an experienced Java programmer can solve easily.
The whole stack trace is:
ptolemy.kernel.util.IllegalActionException: in.range.manager
Because: org/apache/poi/poifs/filesystem/POIFSFileSystem
at ptolemy.actor.Manager.execute(Manager.java:383)
at ptolemy.actor.Manager.run(Manager.java:951) at
ptolemy.actor.Manager$2.run(Manager.java:1003)
Caused by: java.lang.NoClassDefFoundError:
org/apache/poi/poifs/filesystem/POIFSFileSystem
at ptolemy.actor.lib.io.RangeReader.fire(RangeReader.java:123)
at ptolemy.domains.de.kernel.DEDirector.fire(DEDirector.java:506)
at ptolemy.actor.CompositeActor.fire(CompositeActor.java:329)
at ptolemy.actor.Manager.iterate(Manager.java:601) at
ptolemy.actor.Manager.execute(Manager.java:319) ... 2 more
Caused by: java.lang.NoClassDefFoundError:
org/apache/poi/poifs/filesystem/POIFSFileSystem
at ptolemy.actor.lib.io.RangeReader.fire(RangeReader.java:123)
at ptolemy.domains.de.kernel.DEDirector.fire(DEDirector.java:506)
at ptolemy.actor.CompositeActor.fire(CompositeActor.java:329)
at ptolemy.actor.Manager.iterate(Manager.java:601) at
ptolemy.actor.Manager.execute(Manager.java:319)
at ptolemy.actor.Manager.run(Manager.java:951)
Thanks in advance for any help you can give me.
Wayne Goode, SAIC, Huntsville, AL
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