AWS DynamoDB Java Local Testing Example

Example Gradle Java project for using embedded AWS DynamoDB for local testing.

The official AWS DynamoDB example shows you how to use AWS DynamoDB with Maven, but it does not contain details about Gradle setup or how to run tests from your IDE (e.g.: IntelliJ IDEA). This example provides details about these missing areas.

You only need to call AwsDynamoDbLocalTestUtils#initSqLite() in test classes before you plan to use the local database. You can find detailed description below about setting up local testing.

You can copy the content to reuse it in your own project.

Setting Up DynamoDB Local with Gradle

AWS DynamoDB documentation has a detailed description about Setting Up DynamoDB Local, but it does not mention Gradle setup.

You can find a working setup in build.gradle file (with EU repositories).

For each regions, first you need to set the proper repository:

• repositories {
      mavenCentral()
  
      maven {
          name "DynamoDB Local Release Repository - Asia Pacific (Mumbai) Region"
          url "https://s3.ap-south-1.amazonaws.com/dynamodb-local-mumbai/release"
      }
  }

• repositories {
      mavenCentral()
    
      maven {
          name "DynamoDB Local Release Repository - Asia Pacific (Singapore) Region"
          url "https://s3-ap-southeast-1.amazonaws.com/dynamodb-local-singapore/release"
      }
  }

• repositories {
      mavenCentral()
  
      maven {
          name "DynamoDB Local Release Repository - Asia Pacific (Tokyo) Region"
          url "https://s3-ap-northeast-1.amazonaws.com/dynamodb-local-tokyo/release"
      }
  }

• repositories {
      mavenCentral()
  
      maven {
          name "DynamoDB Local Release Repository - EU (Frankfurt) Region"
          url "https://s3.eu-central-1.amazonaws.com/dynamodb-local-frankfurt/release"
      }
  }

• repositories {
      mavenCentral()
   
      maven {
          name "DynamoDB Local Release Repository - South America (São Paulo) Region"
          url "https://s3-sa-east-1.amazonaws.com/dynamodb-local-sao-paulo"
      }
  }

• repositories {
      mavenCentral()
  
      maven {
          name "DynamoDB Local Release Repository - US West (Oregon) Region"
          url "https://s3-us-west-2.amazonaws.com/dynamodb-local/release"
      }
  }

Then set the dependency:

dependencies {
    testCompile group: 'com.amazonaws', name: 'DynamoDBLocal', version: '1.11.119'
}

You can get the version numbers from each regions:

• dynamodb-local-mumbai - https://s3.ap-south-1.amazonaws.com/dynamodb-local-mumbai/release/com/amazonaws/DynamoDBLocal/maven-metadata.xml
• dynamodb-local-singapore - https://s3-ap-southeast-1.amazonaws.com/dynamodb-local-singapore/release/com/amazonaws/DynamoDBLocal/maven-metadata.xml
• dynamodb-local-tokyo - https://s3-ap-northeast-1.amazonaws.com/dynamodb-local-tokyo/release/com/amazonaws/DynamoDBLocal/maven-metadata.xml
• dynamodb-local-frankfurt - https://s3.eu-central-1.amazonaws.com/dynamodb-local-frankfurt/release/com/amazonaws/DynamoDBLocal/maven-metadata.xml
• dynamodb-local-sao-paulo - https://s3-sa-east-1.amazonaws.com/dynamodb-local-sao-paulo/release/com/amazonaws/DynamoDBLocal/maven-metadata.xml
• dynamodb-local-oregon - https://s3-us-west-2.amazonaws.com/dynamodb-local/release/com/amazonaws/DynamoDBLocal/maven-metadata.xml

Initialize sqlite4java for testing

AWS DynamoDB provides possibility to test locally and it requires sqlite4java.library.path system property to be set. In the official example it is set for the Maven project.

If you run it from Gradle or from your IDE, local database might not start as the sqlite4java native libraries are not available. These are downloaded as a dependency of DynamoDBLocal artifact, but it is not visible by default. Sqlite4java loads it from the path defined by sqlite4java.library.path system property.

If it is not set or not valid, you probably see something similar in the logs:

WARNING: [sqlite] cannot open DB[1]: com.almworks.sqlite4java.SQLiteException: [-91] cannot load library: java.lang.UnsatisfiedLinkError: no sqlite4java-linux-i386-1.0.392 in java.library.path
SEVERE: [sqlite] SQLiteQueue[]: error running job queue
com.almworks.sqlite4java.SQLiteException: [-91] cannot load library: java.lang.UnsatisfiedLinkError: no sqlite4java-linux-i386-1.0.392 in java.library.path
Caused by: java.lang.UnsatisfiedLinkError: no sqlite4java-linux-i386-1.0.392 in java.library.path
SEVERE: [sqlite] SQLiteQueue[]: stopped abnormally, reincarnation is not possible for in-memory database

WARNING: [sqlite] cannot open DB[1]: com.almworks.sqlite4java.SQLiteException: [-91] cannot load library: java.lang.UnsatisfiedLinkError: no sqlite4java-linux-amd64-1.0.392 in java.library.path
SEVERE: [sqlite] SQLiteQueue[]: error running job queue
com.almworks.sqlite4java.SQLiteException: [-91] cannot load library: java.lang.UnsatisfiedLinkError: no sqlite4java-linux-amd64-1.0.392 in java.library.path
Caused by: java.lang.UnsatisfiedLinkError: no sqlite4java-linux-amd64-1.0.392 in java.library.path
SEVERE: [sqlite] SQLiteQueue[]: stopped abnormally, reincarnation is not possible for in-memory database

WARNING: [sqlite] cannot open DB[1]: com.almworks.sqlite4java.SQLiteException: [-91] cannot load library: java.lang.UnsatisfiedLinkError: no sqlite4java-win32-x64-1.0.392 in java.library.path
SEVERE: [sqlite] SQLiteQueue[]: error running job queue
com.almworks.sqlite4java.SQLiteException: [-91] cannot load library: java.lang.UnsatisfiedLinkError: no sqlite4java-win32-x64-1.0.392 in java.library.path
Caused by: java.lang.UnsatisfiedLinkError: no sqlite4java-win32-x64-1.0.392 in java.library.path
SEVERE: [sqlite] SQLiteQueue[]: stopped abnormally, reincarnation is not possible for in-memory database

WARNING: [sqlite] cannot open DB[1]: com.almworks.sqlite4java.SQLiteException: [-91] cannot load library: java.lang.UnsatisfiedLinkError: no sqlite4java-win32-x86-1.0.392 in java.library.path
SEVERE: [sqlite] SQLiteQueue[]: error running job queue
com.almworks.sqlite4java.SQLiteException: [-91] cannot load library: java.lang.UnsatisfiedLinkError: no sqlite4java-win32-x86-1.0.392 in java.library.path
Caused by: java.lang.UnsatisfiedLinkError: no sqlite4java-win32-x86-1.0.392 in java.library.path
SEVERE: [sqlite] SQLiteQueue[]: stopped abnormally, reincarnation is not possible for in-memory database

WARNING: [sqlite] cannot open DB[1]: com.almworks.sqlite4java.SQLiteException: [-91] cannot load library: java.lang.UnsatisfiedLinkError: no sqlite4java-osx-1.0.392 in java.library.path
SEVERE: [sqlite] SQLiteQueue[]: error running job queue
com.almworks.sqlite4java.SQLiteException: [-91] cannot load library: java.lang.UnsatisfiedLinkError: no sqlite4java-osx-1.0.392 in java.library.path
Caused by: java.lang.UnsatisfiedLinkError: no sqlite4java-osx-1.0.392 in java.library.path
SEVERE: [sqlite] SQLiteQueue[]: stopped abnormally, reincarnation is not possible for in-memory database

The example contains a simple AwsDynamoDbLocalTestUtils class that can be used for initializing this property for DynamoDB at runtime, so it will work from both your IDE and from Gradle.

You only need to call AwsDynamoDbLocalTestUtils#initSqLite() before you plan to use the local database. If the property is already initialized, the call will skip initialization.

There is an example test, that uses the local database. The test calls the initialization at the @BeforeAll setUp method SimpleCrudTest

Build

To build the example type the following command:

./gradlew clean build

Do not forget to set JAVA_HOME environment variable.

References

• Gradle Build Tool: https://gradle.org/
• AWS DynamoDB documentation / Setting Up DynamoDB Local: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DynamoDBLocal.html
• AWS DynamoDB local testing example with Maven: https://github.com/aws-samples/aws-dynamodb-examples

License

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.