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Re: [ecf-dev] NullpointerException in RemoteServiceAdmin
IOn 9/26/2018 3:54 AM, Peter Hermsdorf wrote:

Hi Scott,

the bug is https://bugs.eclipse.org/bugs/show_bug.cgi?id=539469

Please note that we can not just use the version 2 bundle of org.eclipse.ecf.remoteservice.asyncproxy, because that introduces a dependency to the package org.osgi.util.promise which requires eclipse oxygen as stated here:

http://dev.eclipse.org/mhonarc/lists/equinox-dev/msg08831.html

updating is currently no option for us.


Ok.   I've fixed/resolved bug 539469.   I think we can wait until next simultaneous release (June 2019) for deprecating this bundle...but it may be difficult not to after that.   It depends mostly upon what happens with framework and rsa standardization.

Scott


Thanks, bye Peter

PS: the links to the messages are bringing up a 404 error:

http://dev.eclipse.org/mhonarc/lists/ecf-dev/

i filed a bug here https://bugs.eclipse.org/bugs/show_bug.cgi?id=539471 and added you as CC


Thanks.


Am 25.09.2018 um 16:46 schrieb Scott Lewis:
Hi Peter,

Please go ahead and file a bug.   However, I'm thinking of deprecating the 1.1.0 version of o.e.e.remoteservice.asyncproxy completely (and requiring 2.x), since it's only for support of java 1.7 and below.

Scott


On 9/25/2018 1:09 AM, Peter Hermsdorf wrote:

Hi,

while trying to integrate the fix for the bug below i stumbled upon a new issue:

Caused by: java.lang.NoSuchMethodError: org.eclipse.ecf.remoteservice.AbstractRemoteService.isReturnAsync(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Z
    at org.eclipse.ecf.remoteservice.AbstractRemoteService.invoke(AbstractRemoteService.java:503)
    ... 5 common frames omitted

I updated the ECF implementation to the latest stable version 3.14.1. The above problem happens in bundle org.eclipse.ecf.remoteservice. The class AbstractRemoteService extends AbstractAsyncProxyRemoteService which is imported via package import :

org.eclipse.ecf.remoteservice.asyncproxy;version="[1.0.0,3.0.0)"

I decided to use the bundle org.eclipse.ecf.remoteservice.asyncproxy version 1.1.0.v20180311-0310 (and not version 2.1. 0 because of other dependencies) which perfectly fits into that version range.

The problem is that in that bundle the class AbstractAsyncProxyRemoteService does not have a method isReturnAsync which leads to the above error.


Should i file a bug or is that a known problem?


Thanks, bye Peter



Am 19.09.2018 um 10:28 schrieb Peter Hermsdorf:

Done: https://bugs.eclipse.org/bugs/show_bug.cgi?id=539218

Thanks for looking at the issue!

Bye Peter


Am 18.09.2018 um 19:19 schrieb Scott Lewis:
Hi Peter,

I believe this is due to the (incorrect) line in ImportRegistration.close():

        public void close() {
            boolean publish = false;
            ID containerID = null;
            Throwable exception = null;
            EndpointDescription endpointDescription = null;
            ImportReference imRef = null;
            synchronized (this) {
                // only do this once
                if (!closed) {
                    containerID = getContainerID();
                    exception = getException();
                    endpointDescription = getEndpointDescription();
                    imRef = this.importReference;
                    publish = importReference.close(this);
                    this.importReference = null;                             <-- this line should be deleted
                    closed = true;
                }
            }
...more code

I believe the importReference should never be set to null in the ImportRegistration and that it is incorrect that it did so.   Also synchronization needs to be added to ImportRegistration accessors so that the synchronized block above prevents access to importReference before closed = true (which is resulting in NPE I think).

Peter if you would please open a bug, and put your info in comments I will address in latest version as soon as I can.

Scott





On 9/18/2018 7:33 AM, Peter Hermsdorf wrote:
Hi,

we sometimes faces the following error:

java.lang.NullPointerException
    at org.eclipse.ecf.osgi.services.remoteserviceadmin.RemoteServiceAdmin$ImportRegistration.getException(RemoteServiceAdmin.java:1139)
    at org.eclipse.ecf.osgi.services.remoteserviceadmin.RemoteServiceAdmin$ImportRegistration.getImportReference(RemoteServiceAdmin.java:1104)
    at org.eclipse.ecf.osgi.services.remoteserviceadmin.RemoteServiceAdmin.getImportedEndpoints(RemoteServiceAdmin.java:519)

The corresponding code in the class ImportRegistration is

public Throwable getException() {
            return (closed)?updateException:importReference.getException();
}

So obviously importReference is null but closed is false.

Any ideas what could cause this state? I've seen that there are changes on this class but wasn't able to determine if these have something to do with this handling.

We are still on ECF version 3.13.8 and we are using the ecf-genric provider.

The above code and the call to getImportedEndpoints is used to update the connection state in an RCP application and is asynchronously executed and triggered by a new event to an RemoteServiceAdminListener .... so more ore less on service state change.


Any hints are welcome!


Thanks, bye Peter 



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