FileNotFoundException for properties file in aws-cdk

I’ve been trying to read a properties file and want it to be dynamic, I’m doing this in aws-cdk.

My project layout:

• Main Project
  • resources
    • config.properties
  • src
    • main/java/com/myorg
      • xxxstage.java

The class xxxstage.java has following code:

public class xxxstage extends Stage {
    public xxxstage(final Construct scope, final String id) {
        this(scope, id, null);
    }
    public xxxstage(final Construct scope, final String id, final StageProps props) {
        super(scope, id, props);

        String account = null;
        InputStream inputStream = null;

        try {
            Properties prop = new Properties();
            String propFileName = "resources/config.properties";
            inputStream = this.getClass().getClassLoader().getResourceAsStream(propFileName);
            System.out.println("inputStream is -> "+inputStream);
 
            if (inputStream != null) {
                prop.load(inputStream);
            } else {
                throw new FileNotFoundException("property file '" + propFileName + "' not found in the classpath");
            }
 
            // get the property value and print it out
            account = prop.getProperty("account.id");
 
            System.out.println("account id -> "+account);
        } catch (Exception e) {
            System.out.println("Exception: " + e);
        } finally {
            try{
                inputStream.close();
            }
            catch (Exception e){
                System.out.println("Exception: " + e);
            }
        }

        new xxxStack(this, "xxxStack", StackProps.builder()
        .env(new Environment.Builder()
                .account(account)
                .region("us-east-1")
                .build())
        .build());
    }
}

The line where I’m trying to print System.out.println("inputStream is -> "+inputStream); is showing null, and hence the FileNotFoundException.

It worth noting that this is working fine when I run it on local java-project, its however failing during build phase of the aws-codepipeline. In the pipeline build phase I’m getting:

• inputStream is -> null
• Exception: java.io.FileNotFoundException: property file ‘resources/config.properties’ not found in the classpath
• Exception: java.lang.NullPointerException

Can someone please help?

EDIT 1 – Adding environment variables:

Environment Vars

• PATH=/root/.npm/_npx/230/bin:/usr/local/bin/sbt/bin:/root/.phpenv/shims:/root/.phpenv/bin:/root/.goenv/shims:/root/.goenv/bin:/go/bin:/root/.phpenv/shims:/root/.phpenv/bin:/root/.pyenv/shims:/root/.pyenv/bin:/root/.rbenv/shims:/usr/local/rbenv/bin:/usr/local/rbenv/shims:/root/.dotnet/:/root/.dotnet/tools/:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/tools:/codebuild/user/bin
• AWS_CONTAINER_CREDENTIALS_RELATIVE_URI=/v2/credentials/xxx-xxx-xxx
• CODEBUILD_CI=true
• CODEBUILD_AUTH_TOKEN=xxx-xxx-xxx
• JAVA_8_HOME=/usr/lib/jvm/java-1.8.0-amazon-corretto
• JDK_8_HOME=/usr/lib/jvm/java-1.8.0-amazon-corretto
• CODEBUILD_BUILD_ARN=arn:aws:codebuild:us-east-1:821518525729:build/pipelinePipelinexxx-C-xxx-xxx-xxx
• CODEBUILD_GOPATH=/codebuild/output/src123245
• GOLANG_15_VERSION=1.15.12
• CODEBUILD_BUILD_SUCCEEDING=1
• GOENV_DISABLE_GOPATH=1
• JRE_HOME=/usr/lib/jvm/java-11-amazon-corretto
• CDK_DEFAULT_REGION=us-east-1
• JAVA_11_HOME=/usr/lib/jvm/java-11-amazon-corretto
• PHP_74_VERSION=7.4.13
• CODEBUILD_SOURCE_VERSION=arn:aws:s3:::pipelinexxxstack-pipelinexxxartifacts-1cacuj92rramf/ServiceDeploymentPip/(user)/c1BGqPX
• RUBY_BUILD_SRC_DIR=/usr/local/rbenv/plugins/ruby-build
• JDK_HOME=/usr/lib/jvm/java-11-amazon-corretto
• PWD=/codebuild/output/src12345/src
• CODEBUILD_CONTAINER_NAME=default
• PYTHON_37_VERSION=3.7.10
• CODEBUILD_START_TIME=1642556874326
• CDK_DEFAULT_ACCOUNT=12345
• AWS_REGION=us-east-1
• PYTHON_38_VERSION=3.8.10
• CODEBUILD_BUILD_URL=https://us-east-1.console.aws.amazon.com/codebuild/home?region=us-east-1#/builds/pipelinePipelinexxxSynthC-ofdfmXGrWl5m:xxx-xxx-xxx/view/new
• CDK_OUTDIR=cdk.out
• DOTNET_31_SDK_VERSION=3.1.404
• CODEBUILD_BUILD_ID=pipelinePipelinexxxSynthC-ofdfmXGrWl5m:xxx-xxx-xxx GOPATH=/go:/codebuild/output/src12345
• CODEBUILD_RESOLVED_SOURCE_VERSION=xxx-xxx-xxx
• OLDPWD=/codebuild/output/src12345/src
• RUBY_26_VERSION=2.6.6
• AWS_STS_REGIONAL_ENDPOINTS=regional
• DOTNET_ROOT=/root/.dotnet
• _PROJECT_CONFIG_HASH=xxx-xxx-xxx
• CODEBUILD_AGENT_ENDPOINT=http://127.0.0.1:port
• LC_CTYPE=C.UTF-8
• JRE_8_HOME=/usr/lib/jvm/java-1.8.0-amazon-corretto/jre
• CODEBUILD_BUILD_IMAGE=aws/codebuild/standard:5.0
• PYYAML_VERSION=5.4.1
• FORCE_COLOR=0
• CODEBUILD_BMR_URL=https://CODEBUILD_AGENT:port
• JAVA_HOME=/usr/lib/jvm/java-11-amazon-corretto
• CODEBUILD_SRC_DIR=/codebuild/output/src12345/src
• AWS_DEFAULT_REGION=us-east-1
• AWS_EXECUTION_ENV=AWS_ECS_EC2
• ECS_CONTAINER_METADATA_URI=http://169.254.170.2/v3/xxx-xxx-xxx
• ECS_CONTAINER_METADATA_URI_V4=http://169.254.170.2/v4/xxx-xxx-xxx
• CODEBUILD_INITIATOR=codepipeline/ServicexxxPipeline
• MAVEN_OPTS= -Dmaven.wagon.httpconnectionManager.maxPerRoute=2
• CDK_CONTEXT_JSON={“@aws-cdk/aws-apigateway:usagePlanKeyOrderInsensitiveId”:true,”@aws-cdk/core:enableStackNameDuplicates”:true,”aws-cdk:enableDiffNoFail”:true,”@aws-cdk/core:stackRelativeExports”:true,”@aws-cdk/aws-ecr-assets:dockerIgnoreSupport”:true,”@aws-cdk/aws-secretsmanager:parseOwnedSecretName”:true,”@aws-cdk/aws-kms:defaultKeyPolicies”:true,”@aws-cdk/aws-s3:grantWriteWithoutAcl”:true,”@aws-cdk/aws-ecs-patterns:removeDefaultDesiredCount”:true,”@aws-cdk/aws-rds:lowercaseDbIdentifier”:true,”@aws-cdk/aws-efs:defaultEncryptionAtRest”:true,”@aws-cdk/aws-lambda:recognizeVersionProps”:true,”@aws-cdk/aws-cloudfront:defaultSecurityPolicyTLSv1.2_2021″:true,”@aws-cdk/core:newStyleStackSynthesis”:true,”aws:cdk:enable-path-metadata”:true,”aws:cdk:enable-asset-metadata”:true,”aws:cdk:version-reporting”:true,”aws:cdk:bundling-stacks”:[]}
• CODEBUILD_LOG_PATH=xxx-xxx-xxx
• CODEBUILD_EXECUTION_ROLE_BUILD=
• CODEBUILD_BUILD_NUMBER=31
• GOLANG_16_VERSION=1.16.4
• PHP_73_VERSION=7.3.25
• CODEBUILD_FE_REPORT_ENDPOINT=https://codebuild.us-east-1.amazonaws.com/
• CODEBUILD_LAST_EXIT=0
• AWS_NODEJS_CONNECTION_REUSE_ENABLED=1
• MAVEN_CMD_LINE_ARGS= -e -q compile exec:java
• NUGET_XMLDOC_MODE=skip
• DOTNET_5_SDK_VERSION=5.0.202
• NODE_12_VERSION=12.22.2
• PYTHON_39_VERSION=3.9.5
• CDK_CLI_VERSION=2.8.0
• NODE_14_VERSION=14.17.2
• MAVEN_PROJECTBASEDIR=/codebuild/output/src12345/src
• CDK_CLI_ASM_VERSION=16.0.0
• JRE_11_HOME=/usr/lib/jvm/java-11-amazon-corretto
• RUBY_27_VERSION=2.7.2
• HOSTNAME=12345
• JDK_11_HOME=/usr/lib/jvm/java-11-amazon-corretto
• CODEBUILD_PROJECT_UUID=xxx-xxx-xxx
• PHP_80_VERSION=8.0.0
• CODEBUILD_KMS_KEY_ID=arn:aws:kms:us-east-1:(account-num):alias/aws/s3
• HOME=/root

Answer

I found an answer here and it worked for me. The location of properties file matters.