Indy SDK Java 예제 빌드 및 실행

아래 문서를 참고하여 Ubuntu에서 Indy SDK Java 예제를 빌드하고 실행하는 실습을 진행합니다.

• Indy SDK Samples - Java

1. 실습 환경

• Windows 10
• Oracle VM VirtualBox 6.1.6
  • 가상 머신 생성
    • 이름: ubuntu-indy
    • 메모리 크기: 4 GB
    • 저장소 크기: 40 GB (10 GB로 하면 금방 부족해짐)
• Ubuntu Desktop 20.04 LTS

2. Java 빌드 프로그램 설치

1. Java SDK를 설치합니다.

   $ sudo apt-get install openjdk-8-jdk
   

2. Maven을 설치합니다.

   $ sudo apt-get install maven
   

3. Java 예제 빌드

1. Indy SDK 소스를 다운로드합니다.

   $ cd $HOME
   $ git clone https://github.com/hyperledger/indy-sdk.git
   

2. Java 예제를 빌드합니다.

   $ cd $HOME/indy-sdk/samples/java
   $ mvn package
   

4. 테스트

1. Indy 노드 풀을 실행합니다.

   $ cd $HOME/indy-sdk
   $ docker build -f ci/indy-pool.dockerfile -t indy_pool .
   $ docker run -itd -p 9701-9708:9701-9708 indy_pool
   

2. Java 예제를 실행합니다.

   $ mvn exec:java -Dexec.mainClass=Main
   

   정상적인 실행 결과는 아래와 같은 메시지를 출력합니다.

   Anoncreds sample -> started
   SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
   SLF4J: Defaulting to no-operation (NOP) logger implementation
   SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
   Anoncreds sample -> completed
   Anoncreds Revocation sample -> started
   Anoncreds Revocation sample -> completed
   Ledger sample -> started
   Ledger sample -> completed
   Crypto sample -> started
   Crypto sample -> completed
   Endorser sample -> started
   Endorser sample -> completed
   

   Indy 노드 풀이 실행중이 아닐 경우 아래와 같은 TimeoutException 오류 메시지가 출력됩니다.

   Anoncreds sample -> started
   SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
   SLF4J: Defaulting to no-operation (NOP) logger implementation
   SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
   [WARNING] 
   java.util.concurrent.ExecutionException: org.hyperledger.indy.sdk.ledger.TimeoutException: Timeout happens for ledger operation.
       at java.util.concurrent.CompletableFuture.reportGet (CompletableFuture.java:395)
       at java.util.concurrent.CompletableFuture.get (CompletableFuture.java:1999)
       at Anoncreds.demo (Anoncreds.java:27)
       at Main.main (Main.java:4)
       at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
       at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
       at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
       at java.lang.reflect.Method.invoke (Method.java:566)
       at org.codehaus.mojo.exec.ExecJavaMojo$1.run (ExecJavaMojo.java:282)
       at java.lang.Thread.run (Thread.java:834)
   Caused by: org.hyperledger.indy.sdk.ledger.TimeoutException: Timeout happens for ledger operation.
       at org.hyperledger.indy.sdk.IndyException.fromSdkError (IndyException.java:164)
       at org.hyperledger.indy.sdk.IndyJava$API.checkResult (IndyJava.java:92)
       at org.hyperledger.indy.sdk.pool.Pool.access$100 (Pool.java:20)
       at org.hyperledger.indy.sdk.pool.Pool$1.callback (Pool.java:52)
       at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
       at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
       at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
       at java.lang.reflect.Method.invoke (Method.java:566)
       at com.sun.jna.CallbackReference$DefaultCallbackProxy.invokeCallback (CallbackReference.java:520)
       at com.sun.jna.CallbackReference$DefaultCallbackProxy.callback (CallbackReference.java:551)
   [INFO] ------------------------------------------------------------------------
   [INFO] BUILD FAILURE
   [INFO] ------------------------------------------------------------------------
   

3. Indy 노드 풀 주소를 TEST_POOL_ID 환경변수에 지정하여 Java 예제를 실행할 수 있습니다.

   export TEST_POOL_IP=192.168.56.110
   $ mvn exec:java -Dexec.mainClass=Main
   

   이전에 다른 주소의 Indy 노드 풀에 접근하다가 실패한 적이 있다면 위와 같이 주소를 변경하여 실행할 때 아래와 같은 PoolLedgerConfigExistsException 오류 메시지가 발생할 수 있습니다.

   Anoncreds sample -> started
   SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
   SLF4J: Defaulting to no-operation (NOP) logger implementation
   SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
   [WARNING] 
   java.util.concurrent.ExecutionException: org.hyperledger.indy.sdk.pool.PoolLedgerConfigExistsException: A pool ledger configuration already exists with the specified name.
       at java.util.concurrent.CompletableFuture.reportGet (CompletableFuture.java:395)
       at java.util.concurrent.CompletableFuture.get (CompletableFuture.java:1999)
       at utils.PoolUtils.createPoolLedgerConfig (PoolUtils.java:48)
       at Anoncreds.demo (Anoncreds.java:26)
       at Main.main (Main.java:4)
       at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
       at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
       at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
       at java.lang.reflect.Method.invoke (Method.java:566)
       at org.codehaus.mojo.exec.ExecJavaMojo$1.run (ExecJavaMojo.java:282)
       at java.lang.Thread.run (Thread.java:834)
   Caused by: org.hyperledger.indy.sdk.pool.PoolLedgerConfigExistsException: A pool ledger configuration already exists with the specified name.
       at org.hyperledger.indy.sdk.IndyException.fromSdkError (IndyException.java:162)
       at org.hyperledger.indy.sdk.IndyJava$API.checkResult (IndyJava.java:92)
       at org.hyperledger.indy.sdk.pool.Pool.access$400 (Pool.java:20)
       at org.hyperledger.indy.sdk.pool.Pool$2.callback (Pool.java:70)
       at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
       at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
       at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
       at java.lang.reflect.Method.invoke (Method.java:566)
       at com.sun.jna.CallbackReference$DefaultCallbackProxy.invokeCallback (CallbackReference.java:520)
       at com.sun.jna.CallbackReference$DefaultCallbackProxy.callback (CallbackReference.java:551)
   [INFO] ------------------------------------------------------------------------
   [INFO] BUILD FAILURE
   [INFO] ------------------------------------------------------------------------
   

   이럴 경우에는 $HOME/.indy_client 폴더를 지우고 다시 실행합니다.

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