I have this yaml file defining a open-telemetry-collector in a kubernetes cluster. I have already installed open-telemetry opertor. This is the file:

apiVersion: opentelemetry.io/v1beta1
kind: OpenTelemetryCollector
metadata:
  namespace: observability
  name: hangout-collector
spec:
  config:
    receivers:
      otlp:
        protocols:
          http:
            endpoint: 0.0.0.0:4318

    processors:
      batch:
        send_batch_size: 10000
        timeout: 10s

    exporters:
      debug:
        verbosity: detailed
      prometheus:
        endpoint: 0.0.0.0:8889
        const_labels:
          origin: otel-collector
      otlp:
        endpoint: tempo:4317
        tls:
          insecure: true
      otlphttp/loki:
        endpoint: "http://loki:3100/loki/api/v1/push"

    service:
      pipelines:
        metrics:
          receivers: [otlp]
          processors: [batch]
          exporters: [prometheus]
        traces:
          receivers: [otlp]
          processors: [batch]
          exporters: [otlp]
        logs:
          receivers: [otlp]
          exporters: [otlphttp/loki]

I see these services being created in my cluster:

I'm trying to connect to the collector from a java application using this url: :4318 but I'm getting errors that connection has been refused.