Joe Sam Shirah wrote:

I'm not familiar with Scott Klement's JDBC driver, and I'm a little confused by the implication that his (or any custom) driver is in jt400.jar. Regardless, the thing to note is that you are getting a No *ClassDef* Found error, not a ClassNotFoundException.

The javadocs for NoClassDefFoundError say: "The searched-for class definition existed when the currently executing
class was compiled, but the definition can no longer be found. " I'll refer you to:

Joe Sam, that's interesting. I didn't realize there were two exceptions associated with class-not-found. (I don't know whether I would have noticed if I ever got a ClassNotFound instead of a NoClassDefFound.)

I think Scott's code uses JNI to make native method calls to an existing JDBC driver; I have only ever seen NoClassDefFound when a class is not found for a native method call. I'm just guessing - maybe the class loader used by JNI for native method calls goes through the same path as for method calls in compiled Java classes, so it gives NoClassDefFound.

For example, when I call the following RPG program, which tries to call method mth() in class NoSuchClass, the call fails with java.lang.NoClassDefFoundError: NoSuchClass.

D meth pr extproc(*java:'NoSuchClass':'mth')
D static

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