Opening .xlsx file with Apache POI gives NoClassDefFoundError InvalidFormatException - excel

Question

I'm having trouble getting the import of all the required .jar files working correctly.
My end goal is simply to read in an excel spreadsheet (more specifically .xlsx files) to check whether the speed of Apache POI will work for future applications.
My question is why am I getting thrown the error...
java.lang.NoClassDefFoundError: org/apache/poi/openxml4j/exceptions/InvalidFormatException
...when I can see in the class InvalidFormatException at /org/apache/poi/openxml4j/exceptions/ in the 'file poi-ooxml-3.9-20121203.jar'?
I haven't done programming in Java in a while and I'm hoping for my own sanity that I've made a stupid mistake. My code seems to be compiling correctly but I have the above error message when I try run the program. I have done some research into my issue but haven't been able to find someone in my situation. They usually just forget/don't have a required .jar file. Maybe I'm in the same boat but hopefully you'll be able to tell me.
I'll give a breakdown of my logic. Here is the code in TestExcel.java
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
public class TestExcel
{
public static void main(String[] args)
{
InputStream inp;
try
{
inp = new FileInputStream("cost.xlsx");
Workbook wb;
try {
wb = WorkbookFactory.create(inp);
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
}
catch (InvalidFormatException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
Here is the file 'c_test' used to compile and run the java code:
javac -classpath "/home/robsco/Webdev/java/poi/*" TestExcel.java
java TestExcel
Here is the directory listing of the classpath above:
robsco#roblaptop:~/Webdev/java/poi$ ls -al
total 26616
drwxrwxr-x 2 robsco robsco 4096 Aug 18 18:13 .
drwxrwxr-x 6 robsco robsco 4096 Aug 18 18:12 ..
-rwxr-xr-- 1 robsco robsco 52915 Sep 18 2009 commons-logging-1.1.jar
-rwxr-xr-- 1 robsco robsco 313898 Apr 5 2009 dom4j-1.6.1.jar
-rwxr-xr-- 1 robsco robsco 121070 Apr 5 2009 junit-3.8.1.jar
-rwxr-xr-- 1 robsco robsco 358180 Apr 5 2009 log4j-1.2.13.jar
-rwxrw-r-- 1 robsco robsco 14841622 Aug 18 13:15 ooxml-schemas-1.1.jar
-rwxr-xr-- 1 robsco robsco 1869113 Nov 26 2012 poi-3.9-20121203.jar
-rwxr-xr-- 1 robsco robsco 30446 Nov 26 2012 poi-excelant-3.9-20121203.jar
-rwxr-xr-- 1 robsco robsco 936648 Nov 26 2012 poi-ooxml-3.9-20121203.jar
-rwxr-xr-- 1 robsco robsco 4802621 Nov 26 2012 poi-ooxml-schemas-3.9-20121203.jar
-rwxr-xr-- 1 robsco robsco 1226511 Nov 26 2012 poi-scratchpad-3.9-20121203.jar
-rwxr-xr-- 1 robsco robsco 2666695 Apr 5 2009 xmlbeans-2.3.0.jar
and the output of executing 'c_test':
robsco#roblaptop:~/Webdev/java$ ./c_test
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/poi/openxml4j/exceptions/InvalidFormatException
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2521)
at java.lang.Class.getMethod0(Class.java:2764)
at java.lang.Class.getMethod(Class.java:1653)
at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:494)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:486)
Caused by: java.lang.ClassNotFoundException: org.apache.poi.openxml4j.exceptions.InvalidFormatException
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 6 more
I am using:
OS: Lubuntu 12.10 x86
java -version
java version "1.7.0_25"
Java(TM) SE Runtime Environment (build 1.7.0_25-b15)
robsco#roblaptop:~/Webdev/java/poi$ javac -version
javac 1.7.0_25

Answer 1

The problem is with how you're launching your program. I see you currently have a shell script of:
javac -classpath "/home/robsco/Webdev/java/poi/*" TestExcel.java
java TestExcel
That compiles with all the jars, but doesn't run with them, so your program won't have its dependencies available. (Unlike with some c programs, compiling with Java won't inline the depdendencies, nor will it add local links to the files. There are tools that will do that for you if you really need it though)
If you change your shell script to be:
javac -classpath "/home/robsco/Webdev/java/poi/*" TestExcel.java
java -classpath ".:/home/robsco/Webdev/java/poi/*" TestExcel
It should work fine. Note the addition of the current directory in the classpath in order for 'java' to find your class (in this case TestExcel).
Alternately, you could do something a little icky with environment variables, using the CLASSPATH envvar that Java checks, eg
export CLASSPATH=.:`ls -1d --color=no /home/robsco/Webdev/java/poi/* | xargs echo | sed 's/ /\:/g'`
javac TestExcel.java
java TestExcel