census-api | The home for the API that powers the Census Reporter project

I am trying to implement gRPC service in my code with condition to use one instance of the server class the code building successfully but i got a runtime error.

How can I fix this error?

I'm at the following step of a GCP openapi guide where I have to run a maven command to generate an openapi.json file.

I'm following along with my own project, so this may or not be reproducible by just forking the example repository. (so I wouldn't, because I link my own below)

So when I run the command they tell me to, I get the following stack trace, complaining that they can't find my api class, when it very clearly exists.

I have a basic SpringBoot 2.1.5.RELEASE app. Using Spring Initializer, JPA, embedded Tomcat, Thymeleaf template engine, and package as an executable JAR. When I init the app I see this message:

I try to add custom spans and annotations to an AppEngine Standard application. In the Traces page of the GCP console, I see the default spans but not the custom spans that I have added.

I follow the documentation: https://cloud.google.com/trace/docs/setup/java I use the latest version of opencensus-api 0.23.0

The Stackdrive Trace API is enabled and I see in the metrics page of the API that the application does successful google.devtools.cloudtrace.v2.TraceService.BatchWriteSpans calls.

I created a sample application based on the official helloworld application that reproduces this problem.

The interesting parts:

There are similar post for this type of error but i can't figure what is wrong in my case.

The error is:

AGPBI: {"kind":"error","text":"Program type already present: com.google.common.annotations.GwtCompatible","sources":[{}],"tool":"D8"}

...

I've been trying to integrate some Firebase features on our server-side, which uses Spring.

Apparently, Spring can decide to launch multiple times the public static void main (I'll call it "main" from now on) method. (Why?)

The problem is that Firebase needs our server to authenticate itself before being able to use some Admin SDK features (such as verifying the signature of an idToken). I thought this would usually go in the main method, but as it is, it is being called twice, which causes a FirebaseApp with name [DEFAULT] already exist. Exception.

I guess there are two solutions, so I'll ask two questions:

1. How do I prevent Spring from running the main multiple times? (Why does it even do that?)
2. How do I prevent the server-authentication to be called twice? (Maybe a simple private static boolean attribute will suffice, but I feel like there should be a better way to work around that.)

EDIT: It seems like the "boolean" approach doesn't even work. I'm guessing that Spring's second calls are asynchronous..?

EDIT:

Here is the main() code (the authenticateServer() method is ran twice before Spring is launched):

I am trying to deploy an app on PCF at pivotal.io trial account. My springboot app works fine locally using java -jar, but when I push my app to PCF it crashes. I was able to get the app up and running by changing some dependencies in my gradle but that caused one of my other lib(fabric-connector) to not work. I've posted my logs from PCF, gradle.build and manifest below. Thank you. Please help.

I'm new in Java development and I faced this error when trying to get querystring variables by getParameterMap() method:

Started getting these errors: