serverless-java-container
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NPE on org.springframework.boot.SpringApplication.getMainApplicationClass() with AOT
Hi! I'm trying to implement AOT into a simple java lambda
I'm using the com.amazonaws.serverless.proxy.spring.SpringDelegatingLambdaContainerHandler handler
Dependencies:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>3.5.7</version>
</dependency>
<dependency>
<groupId>com.amazonaws.serverless</groupId>
<artifactId>aws-serverless-java-container-springboot3</artifactId>
<version>2.1.5</version>
</dependency>
Logs:
Picked up JAVA_TOOL_OPTIONS: -Dspring.aot.enabled=true
Picked up _JAVA_OPTIONS: -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,quiet=y,address=*:5005 -XX:MaxHeapSize=2834432k -XX:+UseSerialGC -XX:+TieredCompilation -XX:TieredStopAtLevel=1 -Djava.net.preferIPv4Stack=true
11:25:50.498 [main] INFO org.springframework.cloud.function.serverless.web.FunctionClassUtils -- Main class: class org.example.IssueApplication
11:25:50.520 [main] INFO com.amazonaws.serverless.proxy.AsyncInitializationWrapper -- Async initialization will wait for 5775ms (init grace time is configured to 150)
11:25:50.522 [Thread-0] INFO com.amazonaws.serverless.proxy.AsyncInitializationWrapper -- Starting async initializer
11:25:50.550 [Thread-1] INFO org.springframework.cloud.function.serverless.web.ServerlessMVC -- Starting application with the following configuration classes:
11:25:50.551 [Thread-1] INFO org.springframework.cloud.function.serverless.web.ServerlessMVC -- IssueApplication
11:28:37.898 [Thread-1] ERROR org.springframework.boot.SpringApplication -- Application run failed
java.lang.NullPointerException: Cannot invoke "java.lang.Class.getName()" because the return value of "org.springframework.boot.SpringApplication.getMainApplicationClass()" is null
at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.addAotGeneratedEnvironmentPostProcessorIfNecessary(EnvironmentPostProcessorApplicationListener.java:160)
at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEnvironmentPreparedEvent(EnvironmentPostProcessorApplicationListener.java:130)
at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEvent(EnvironmentPostProcessorApplicationListener.java:115)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138)
at org.springframework.boot.context.event.EventPublishingRunListener.multicastInitialEvent(EventPublishingRunListener.java:136)
at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:81)
at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:64)
at java.base/java.lang.Iterable.forEach(Unknown Source)
at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:118)
at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:112)
at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:63)
at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:353)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:313)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361)
at org.springframework.cloud.function.serverless.web.ServerlessMVC.initContext(ServerlessMVC.java:125)
at org.springframework.cloud.function.serverless.web.ServerlessMVC.lambda$initializeContextAsync$1(ServerlessMVC.java:112)
at java.base/java.lang.Thread.run(Unknown Source)
11:28:37.900 [Thread-1] INFO org.springframework.cloud.function.serverless.web.ServerlessMVC -- Application is started successfully.
Exception in thread "Thread-1" java.lang.IllegalStateException: java.lang.NullPointerException: Cannot invoke "java.lang.Class.getName()" because the return value of "org.springframework.boot.SpringApplication.getMainApplicationClass()" is null
at org.springframework.cloud.function.serverless.web.ServerlessMVC.lambda$initializeContextAsync$1(ServerlessMVC.java:115)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException: Cannot invoke "java.lang.Class.getName()" because the return value of "org.springframework.boot.SpringApplication.getMainApplicationClass()" is null
at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.addAotGeneratedEnvironmentPostProcessorIfNecessary(EnvironmentPostProcessorApplicationListener.java:160)
at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEnvironmentPreparedEvent(EnvironmentPostProcessorApplicationListener.java:130)
at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEvent(EnvironmentPostProcessorApplicationListener.java:115)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138)
at org.springframework.boot.context.event.EventPublishingRunListener.multicastInitialEvent(EventPublishingRunListener.java:136)
at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:81)
at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:64)
at java.base/java.lang.Iterable.forEach(Unknown Source)
at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:118)
at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:112)
at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:63)
at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:353)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:313)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361)
at org.springframework.cloud.function.serverless.web.ServerlessMVC.initContext(ServerlessMVC.java:125)
at org.springframework.cloud.function.serverless.web.ServerlessMVC.lambda$initializeContextAsync$1(ServerlessMVC.java:112)
... 1 more
Cannot invoke "org.springframework.web.servlet.DispatcherServlet.getServletContext()" because "this.dispatcher" is null: java.lang.NullPointerException
java.lang.NullPointerException: Cannot invoke "org.springframework.web.servlet.DispatcherServlet.getServletContext()" because "this.dispatcher" is null
at org.springframework.cloud.function.serverless.web.ServerlessMVC.getServletContext(ServerlessMVC.java:138)
at com.amazonaws.serverless.proxy.spring.SpringDelegatingLambdaContainerHandler.handleRequest(SpringDelegatingLambdaContainerHandler.java:68)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
END RequestId: 8baa5a53-ca92-4fd0-bc7e-b3720868d264
REPORT RequestId: 8baa5a53-ca92-4fd0-bc7e-b3720868d264 Init Duration: 0.02 ms Duration: 171628.48 ms Billed Duration: 171629 ms Memory Size: 4096 MB Max Memory Used: 4096 MB
I think that the issue is in the async initialization logic of the SpringDelegatingLambdaContainerHandler
Here:
https://github.com/aws/serverless-java-container/blob/4696691989cfcd5d8957dbdfc280018aa267c8ba/aws-serverless-java-container-springboot3/src/main/java/com/amazonaws/serverless/proxy/spring/SpringDelegatingLambdaContainerHandler.java#L52-L63
Also here:
https://github.com/aws/serverless-java-container/blob/4696691989cfcd5d8957dbdfc280018aa267c8ba/aws-serverless-java-container-springboot3/src/main/java/com/amazonaws/serverless/proxy/spring/SpringDelegatingLambdaContainerHandler.java#L73-L90
Spring Code:
The deduceMainApplicationClass method use the StackWalker to find, in the stacktrace, the first method that has a static main
This method doesn't exists in the different thread
Update
Creating a custom lambda handler instead of using the SpringDelegatingLambdaContainerHandler "bypass" this issue but creates another
Handler:
public class StreamLambdaHandler implements RequestStreamHandler {
private static final Logger logger = LoggerFactory.getLogger(StreamLambdaHandler.class);
private static SpringBootLambdaContainerHandler<AwsProxyRequest, AwsProxyResponse> handler;
static {
try {
handler = SpringBootLambdaContainerHandler.getAwsProxyHandler(IssueApplication.class);
} catch (ContainerInitializationException e) {
// if we fail here. We re-throw the exception to force another cold start
e.printStackTrace();
throw new RuntimeException("Could not initialize Spring Boot application", e);
}
}
@Override
public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context)
throws IOException {
logger.info("entered generic stream lambda handler");
handler.proxyStream(inputStream, outputStream, context);
}
}
Issue:
Description:
Startup with AOT mode enabled failed: AOT initializer com.amazonaws.services.lambda.runtime.api.client.AWSLambda__ApplicationContextInitializer could not be found
Action:
Consider the following:
Did you build the application with enabled AOT processing?
Is the main class com.amazonaws.services.lambda.runtime.api.client.AWSLambda correct?
If you want to run the application in regular mode, remove the system property 'spring.aot.enabled'
Error loading class org.example.StreamLambdaHandler: java.lang.ExceptionInInitializerError
java.lang.ExceptionInInitializerError
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Unknown Source)
at java.base/java.lang.Class.forName(Unknown Source)
Caused by: org.springframework.boot.AotInitializerNotFoundException: Startup with AOT mode enabled failed: AOT initializer com.amazonaws.services.lambda.runtime.api.client.AWSLambda__ApplicationContextInitializer could not be found
at org.springframework.boot.SpringApplication.addAotGeneratedInitializerIfNecessary(SpringApplication.java:426)
at org.springframework.boot.SpringApplication.prepareContext(SpringApplication.java:382)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:317)
at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:149)
at com.amazonaws.serverless.proxy.spring.SpringBootLambdaContainerHandler.initialize(SpringBootLambdaContainerHandler.java:198)
at com.amazonaws.serverless.proxy.InitializationWrapper.start(InitializationWrapper.java:35)
at com.amazonaws.serverless.proxy.spring.SpringBootProxyHandlerBuilder.buildAndInitialize(SpringBootProxyHandlerBuilder.java:80)
at com.amazonaws.serverless.proxy.spring.SpringBootLambdaContainerHandler.getAwsProxyHandler(SpringBootLambdaContainerHandler.java:96)
at org.example.StreamLambdaHandler.<clinit>(StreamLambdaHandler.java:23)
... 3 more
It this case the deduceMainApplicationClass finds the AWS Runtime Interface Client class: com.amazonaws.services.lambda.runtime.api.client.AWSLambda so AOT looks for the wrong *__ApplicationContextInitializer
I created another issue about this specific problem: #1580
