Problems in Reflectin JCO Class

Question

Hello.
I am new to Java but very used to ABAP. To start some experiments in Java I want to check, whether JCO Library is available using Reflection-API.
Therefore I wrote the following code:
          Class jcoclass;
          try {
               // try to retrieve descriptor for JCo class
               ClassLoader.getSystemClassLoader().loadClass("com.sap.mw.jco.JCO");
               jcoclass = Class.forName("com.sap.mw.jco.JCO", true, ClassLoader.getSystemClassLoader());
               if (jcoclass != null) {
                    // successful
                    System.out.println("SAP JCo Library available");
               } //if (jcoclass != null)
Unfortunately, this causes a ClassNotFoundException. As soon as I adopt the code to check whether Java ClassLoader is able to load a standard class (here: String), it works:
          Class jcoclass;
          try {
               // try to retrieve descriptor for JCo class
               ClassLoader.getSystemClassLoader().loadClass("java.lang.String");
               jcoclass = Class.forName("java.lang.String", true, ClassLoader.getSystemClassLoader());
               if (jcoclass != null) {
                    // successful
                    System.out.println("SAP JCo Library available");
               } //if (jcoclass != null)
I guess, that my mistake is either the "full qualified name" of the JCo class ("com.sap.mw.jco.JCO"), or a mislocated JCo Library. The JCo Library Files ("librfc32.dll", "sapjco.jar" and "sapjcorfc.dll") are located in the same directory, where the compiled class is located. The dll Files are additionally located in C:\WINDOWS\system32\.
Please help me startung off with Java
Additional information:
- I am using JDK 1.6.0_06 and
- SAP JCo Library 2.1.8 32bit

Answer 1

Solved the problem on my own:
The CLASSPATH contained the directory containing "sapjco.jar", but not "sapjco.jar" itself.
"sapjco.jar" is located in directory "C:\JCo\". So, my CLASSPATH was confgured to be ".;C:\JCO\". But it should have been configured to ".;C:\JCO\sapjco.jar".