Caused by: java.lang.ClassCastException: org.springframework.web.context.support.ServletContextResource cannot be cast to org.springframework.core.io.WritableResource

[sayi65]

I referred this URL:
https://docs.spring.io/spring-cloud-gcp/docs/1.0.0.M3/reference/htmlsingle/#_google_cloud_storage

#254 has same error

code:

                   String bucket = "gs://BUCKET-NAME/";

                   filename = UUID.randomUUID().toString() + ".jpg";

                   WritableResource gcs = (WritableResource)
                           context.getResource(bucket + "/" + filename);

                   try (OutputStream os = gcs.getOutputStream()) {
                       os.write(profile.getAvatar().getBytes());
                   } catch (IOException e) {
                       e.printStackTrace();
                   }

application.properties

spring.cloud.gcp.project-id=PROJECT-ID
spring.cloud.gcp.credentials.location=file://*.json
spring.cloud.gcp.storage.credentials.scopes=https://www.googleapis.com/auth/devstorage.read_write

build.gradle

dependencies {
    compile 'org.springframework.cloud:spring-cloud-gcp:1.0.0.M3'
}repositories {
    maven {
        url 'https://repo.spring.io/libs-milestone'
    }
}

ERROR:
java.lang.ClassCastException: org.springframework.web.context.support.ServletContextResource cannot be cast to org.springframework.core.io.WritableResource

[meltsufin]

@sayi65 Thank you for the issue submission!
We have a sample app that is doing something very similar and does not encounter this error.
We can't debug this further unless with can reproduce the issue. Can you please start with our sample, and see it how needs to be modified to cause this error?

[ChengyuanZhao]

It looks like you're adding an extra slash because the bucket string already has one at the end. (but then again you have a placeholder "BUCKET-NAME" bucket name there, so i don't know if your actual code has this extra slash also)

[sayi65]

@meltsufin
OK thank you for your comment.
i will try that sample app.

[sayi65]

@ChengyuanZhao
thank you for your comment.
i will delete the slash.

[orhan-swe]

@sayi65 Did you ever manage to resolve the issue?

[meltsufin]

@orhan-swe Are you able to reproduce the issue? If so, can you share some code that we can try?

[orhan-swe]

Actually I am getting another error so I do not think this is relevant anymore. If I do find it relevant I will post my findings here later.