I'm guessing this server has been running for a while, and possibly
seen/caught other NPEs before this point? Hotspot has an optimization where
it stops producing stack traces for null pointer exceptions (as well as a
few other exceptions) after it is thrown a few times (usually "many", but
technically "two" is possible if they are rare enough and don't affect jit
codegen) - if it is being thrown and caught a lot, the JVM will remove this
to avoid needing to walk the stack so many times.
You can disable this behavior with the flag
"-XX:-OmitStackTraceInFastThrow". Here's the writeup that I usually find
when I get bothered by this issue:
https://stackoverflow.com/a/58700744/860630.
On Thursday, February 29, 2024 at 10:23:05 AM UTC-6 alex...@gmail.com wrote:
> Hi
>
> I am afraid this is probably more a general Java question than a pure GWT
> question. But I am suspecting the problem somewhere in GWT server-side
> hence asking here.
>
> I am looking for help to read my stack trace around GWT RPC
> and InvocationTargetException Btw the system recovered after a server
> restart, without changing anything.
>
> Stack trace was:
> ...
>
>
>
> *at java.lang.Thread.run(Thread.java:748)Caused by:
> com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public
> abstract xx.webapp.shared.domain.xxDTO xx.share> at
> com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:416)*
>
> *at
> com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:605)*
>
> *at
> com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:571)*
>
> *at
> xxx.server.spring.SpringGwtRemoteServiceServlet.processCall(SpringGwtRemoteServiceServlet.java:120)*
>
>
> *... 101 common frames omittedCaused by: java.lang.NullPointerException:
> null*
> *{call stack log ends here}*
>
> Relevant GWT code from RPC class:
>
> [image: image.png]
>
> RPC class checks for cause==null so that's not it. But then why is it not
> showing the actual line of code where the causing exception is thrown?
>
> Regards,
> Alex
>
>
>
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