[dgraph4j] Using java client connect to dgraph alpha failed. (docker on AWS EC2)

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Resolved.

It’s grpc issue. I excluded the grpc related dependencies in dgraph4j and added the newest version:

    <dependency>
      <groupId>com.google.protobuf</groupId>
      <artifactId>protobuf-java</artifactId>
      <version>3.11.1</version>
    </dependency>

    <dependency>
      <groupId>io.dgraph</groupId>
      <artifactId>dgraph4j</artifactId>
      <version>2.0.2</version>
      <exclusions>
        <exclusion>
          <groupId>io.grpc</groupId>
          <artifactId>grpc-protobuf</artifactId>
        </exclusion>
        <exclusion>
          <groupId>io.grpc</groupId>
          <artifactId>grpc-stub</artifactId>
        </exclusion>
        <exclusion>
          <groupId>io.grpc</groupId>
          <artifactId>grpc-netty</artifactId>
        </exclusion>
      </exclusions>
    </dependency>

    <dependency>
      <groupId>io.grpc</groupId>
      <artifactId>grpc-protobuf</artifactId>
      <version>1.26.0</version>
    </dependency>
    <dependency>
      <groupId>io.grpc</groupId>
      <artifactId>grpc-stub</artifactId>
      <version>1.26.0</version>
    </dependency>
    <dependency>
      <groupId>io.grpc</groupId>
      <artifactId>grpc-netty</artifactId>
      <version>1.26.0</version>
    </dependency>

It works and no exceptions occur.

Related link: Missing connections behind proxy · Issue #21 · googleapis/java-dialogflow · GitHub

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