Re: Re: NoClassDefFoundError when call from native side

On 5/3/2014 9:48 AM, [email protected] wrote:
> Thank you for the answer.
>
> It is right, there was a problem of binding with native methods when the
> methods contains a certain kind of arguments.
>
> As suggested, I tested the code with a simple JNI hello-world example. All
> works great with this example now (no more UnsatisfiedLinkError).
>
> Now when I try to run my graphical interface program, I still have the
> NoClassDefFoundError, I think this is a classpath problem but I have no idea
> how to debug and solve this..
>
> Thank you.
>
> The error:
> $ java -Xbootclasspath/a:TypeWrappers.jar -javaagent:agent.jar -jar float.jar
> Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize
> class sun.java2d.SunGraphics2D

While I understand the NoClassDefFoundError usually means that the JVM literally
could not find a class on the classpath, here it means that a class's static
initializer failed.  When that happens, the JVM has to declare the class unusable,
and so it makes it unavailable for other code to use.  It is therefore as *if*
the class had not been found (as far as other code is concerned), but the real
problem is with some static initializer or static code block in SunGraphics2D.
(It is possible that some class needed there could not be found, but I think
that the exception would have identified that other class.)

Regards -- Eliot Moss

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