[Rest][2023-08-02 18:39:02][ERROR][PostingController.java][lambda$doFindPostingActivity$5(92)] : readPosting
org.springframework.aop.AopInvocationException: Null return value from advice does not match primitive return type for: public abstract boolean net.infobank.moyamo.repository.PostingRepository.isPostingOwner(long,java.lang.Long)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:229)
        at com.sun.proxy.$Proxy237.isPostingOwner(Unknown Source)
        at net.infobank.moyamo.service.PostingService.findPostingActivity(PostingService.java:1831)
        at net.infobank.moyamo.service.PostingService$$FastClassBySpringCGLIB$$72b2a0db.invoke(<generated>)
        at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:779)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750)
        at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123)
        at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750)
        at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:692)
        at net.infobank.moyamo.service.PostingService$$EnhancerBySpringCGLIB$$886f7a7f.findPostingActivity(<generated>)
        at net.infobank.moyamo.controller.PostingController.lambda$doFindPostingActivity$4(PostingController.java:91)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)

Handling

The error message you are encountering (AopInvocationException: Null return value from advice does not match primitive return type) suggests that a method with a primitive return type (boolean in this case) is returning null. Since primitives cannot be null, this results in an exception.

Here's a brief rundown of what might be happening:

1. Method Signature: The method isPostingOwner(long, java.lang.Long) in the PostingRepository interface is declared with a return type of boolean.
2. Proxy Invocation: During the invocation, some AOP advice (such as a transactional aspect) may be being applied to this method.
3. Null Return: For some reason, this method is returning null (possibly from a repository implementation or advice method), which is not compatible with the primitive boolean return type.

Here's how you can potentially resolve this:

1. Check the Repository Implementation

Ensure that the method's implementation in the corresponding repository class is not returning null. It should return a boolean value (true or false).

2. Check the AOP Advice

If there is any AOP (Aspect-Oriented Programming) advice being applied to the method, make sure that it's not altering the return value to null. Examine any aspects that might be affecting the method, including transactional aspects.

3. Change the Return Type (if applicable)

If it is acceptable for the method to indicate an absence of a value, consider changing the return type of the method from the primitive boolean to the wrapper class Boolean. This will allow the method to return null. Note that this will require handling the null value in the calling code.

Example:

4. Exception Handling

If the null return is expected in some situations (like when some data is not found), consider adding proper exception handling in the method or its caller to deal with these scenarios gracefully.

By focusing on these areas, you should be able to track down the cause of the exception and resolve it. Make sure to thoroughly test your changes to ensure they don't introduce other issues.

JPOL 상에서 일치하지 않는 return type을 확인해서 boolean 에서 Boolean 으로 변경

@Query("select p.owner.id from Posting p where p.id = :postingId and p.owner.id = :userId")
Boolean isPostingOwner(@Param("postingId") long postingId, @Param("userId") Long userId);

추가적으로 null Pointer Exception handling

if(isWatch == null) {
    isWatch = !commentRepository.findDistinctRecipientByMentionUserIds(id, Collections.singletonList(user.getId())).isEmpty();
    Boolean isOwner = postingRepository.isPostingOwner(id, user.getId());
    isWatch = isWatch || (isOwner != null && isOwner);
}

을 했지만 문제발생으로 인한 JPQL 변경으로 처리

@Query("select case when count(p) > 0 then true else false end from Posting p where p.id = :postingId and p.owner.id = :userId")
Boolean isPostingOwner(@Param("postingId") long postingId, @Param("userId") Long userId);

AWS assigns the following unique identifiers to each AWS account:

You must be authenticated with AWS to view these identifiers.

Finding your AWS account ID

You can find the AWS account ID using either the AWS Management Console or the AWS Command Line Interface (AWS CLI). In the console, the location of the account ID depends on whether you're signed in as the root user or an IAM user. The account ID is the same whether you're signed in as the root user or an IAM user.

Finding your account ID as the root user

$ aws sts get-caller-identity \
    --query Account \
    --output text
123456789012

In calling API Gateway with cloud functions, Terminal message show me like below:

Although API gateway was assigned to PUBLIC ZONE and No API Key, means authentication do not needed, happened problem and postman was same thing.

But do not error response after connecting SSL VPN, Be exactly, If API gateway zone setting was "Public", must be accessed by someone and somewhere End-Point.

Trouble Shooting - Guide Document modifying planned

dependencies {
    // Other dependencies...
    implementation 'com.slack.api:slack-java-api:2.10.0'
}

요로코롬 2.10.0 을 납치해주면 될 것 같지만 작동하지 않는다.

Gradle

Do you prefer using Gradle? Let’s try installing the library with Gradle. The steps are quite similar to Maven, but there are some differences.

build.gradle

Place build.gradle in the root directory of your Java project. We don’t have any requirements for Gradle versions.

plugins {
  id("application")
}
repositories {
  mavenCentral()
}
dependencies {
  implementation("com.slack.api:slack-api-client:1.30.0")
}
application {
  mainClassName = "Example"
}

As with the Maven section, let’s create a class named Example with the main method. Then, run it from your IDE or hit gradle run on your terminal. You’ll see the same stdout.

In summary, the things you’ve done here are:

• ✅ JDK 8 or higher installed (if not, run brew install openjdk@11 for macOS / visit OpenJDK website for others)
• ✅ Gradle installed (if not, run brew install gradle for macOS / visit their website for others)
• ✅ build.gradle having slack-api-client as a dependency
• ✅ src/main/java/Example.java with the main method

Gradle for Kotlin

위에처럼 1.30.0 에 대한 부분을 build.gradle 에 의존성 결과로 적용해준 이후에 import 할 수 있었다.

특히 코드에서 몇가지 없는 부분들이 있는데, 버전이 올라감에 따라서 .get method 등이 deprecated 되었다.

https://slack.dev/java-slack-sdk/guides/web-api-client-setup