Rsa provider not found

Hello,
i have the following problem. Our product is a workflow enterprise solution. We use a licence file, which is rsa encrypted. I wrote for this a class that does the encryption. It works fine, when called directly (inside eclipse), but i also need to call it inside the setup package. Because i run a lot of other java classes inside the setup package, i decided to implement a "Runner" class which includes a lot of jars and then invokes the class i really want to run.
When i do this with my encryption class (i want to read the licence file in that particular case) i get the following error:
java.security.NoSuchAlgorithmException: Cannot find any provider supporting rsa
     at javax.crypto.Cipher.getInstance(DashoA6275)
     at at....impl.LicenceReader.load(LicenceReader.java:147)
     at at....impl.LicenceReader.<init>(LicenceReader.java:56)
     at at....tools.StartupFileWriter.<init>(StartupFileWriter.java:35)
     at at....install.WriteContextFiles.main(WriteContextFiles.java:17)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.apache.tools.ant.taskdefs.ExecuteJava.run(ExecuteJava.java:200)
     at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:134)
     at org.apache.tools.ant.taskdefs.Java.run(Java.java:710)
     at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:178)
     at org.apache.tools.ant.taskdefs.Java.execute(Java.java:84)
     at at.workflow.webdesk.install.Runner.launchJava(Runner.java:227)
     at at.workflow.webdesk.install.Runner.main(Runner.java:51)
The following code snippet shows where it hangs:
Security.addProvider(new BouncyCastleProvider());
Cipher decrypting = Cipher.getInstance("rsa");
As you can see, i added the BouncyCastleProvider (which works fine), which supports RSA encryption and decryption. When i run the class inside eclipse everything works. When i run the "Runner" class, which invokes the LicenceReader class the above error appears. The BouncyCastle jar is inside the classpath!
I would appreciate every response!
regards, Harald Entner

found an answer myself..

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