Pub/Sub give problem in AppEngine with Standard Environment with Java 7

[ahzamfarhan]

Pub/Sub give problem in AppEngine with Standard Environment with Java 7

Hi, I have created Google PUB/SUB using topic. I get error in my Subscriber code. my code works on my local tomcat server but when I deployed it on Google cloud AppEngine with standard environment. It gives following error.
Could not initialize class com.google.cloud.pubsub.v1.Subscriber

Initialization of Subscriber instance is failed on Google cloud AppEngine whereas Subscriber is initialized in local tomcat
com.google.cloud.pubsub.v1.Subscriber subscriber = Subscriber.defaultBuilder(subscription,receiver).build();

I have used following Maven dependencies

com.google.appengine
appengine-api-1.0-sdk
1.9.54

com.google.api-client google-api-client-appengine 1.21.0 javax.servlet servlet-api javax.servlet servlet-api com.google.guava guava-jdk5 com.google.apis google-api-services-pubsub v1-rev8-1.21.0 com.google.cloud google-cloud-examples 0.22.0-alpha com.google.appengine.tools appengine-gcs-client 0.5 com.google.http-client google-http-client com.google.appengine appengine-remote-api 1.9.32

[michaelbausor]

@neozwu can you comment on this?

[ahzamfarhan]

I did not get the answer of my question. I once again describe my problem in short. I have AppEngine with Standard Environment whenever I deploy my web app on AppEngine on standard environment, it gives me error as "java.lang.NoClassDefFoundError: Could not initialize class com.google.cloud.pubsub.v1.Subscriber" but same webapp application run fine on my local tomcat server. I want to know if AppEngine with Standard Environment supports com.google.cloud.pubsub.v1.Subscriber initialization or not?

[michaelbausor]

We do not expect PubSub (or other gRPC-based APIs) to work with Java 7 on AppEngine Standard. (See for example this comment).

It should work using Java 8 on AppEngine Standard.

It doesn't look like you have a direct dependency on the google-cloud-pubsub package (see here on github: https://github.com/GoogleCloudPlatform/google-cloud-java/tree/master/google-cloud-pubsub). If you are using Java 8 and seeing this problem, you could try adding this dependency.

[ahzamfarhan]

Thanks michaelbauso,
AppEngine Standard by default uses jdk 7. I want to know to change AppEngine Standard to use jdk 8.

[michaelbausor]

No worries! For Java 8, take a look at the documentation here: https://cloud.google.com/appengine/docs/standard/java/runtime-java8

[ahzamfarhan]

I have followed the steps specified on URL https://cloud.google.com/appengine/docs/standard/java/runtime-java8 for changing from java 7 to java 8 for standard AppEngine. I am getting following error while executing command 'mvn appengine:update'

java.io.IOException: Cannot run program "C:\jdk1.8.0_144\jre\bin\java.exe": Crea
teProcess error=206, The filename or extension is too long
Unable to update app: Cannot run program "C:\jdk1.8.0_144\jre\bin\java.exe": Cre
ateProcess error=206, The filename or extension is too long
Please see the logs [C:\Users\farhanm\AppData\Local\Temp\appcfg16888316327372592
11.log] for further information.

[lesv]

@ahzamfarhan Can you post a copy of your log? (if it doesn't have any confidential info in it)

[lesv]

@ahzamfarhan Also, take a look at https://cloud.google.com/appengine/docs/standard/java/migrating-to-java8
for migration info.

[anthmgoogle]

Looks like the original issue has been clarified. If there are issues with moving to Java8 it may be best to create a new issue.