Aws-sam-cli: java.lang.ClassNotFoundException: com.aws.codestar.projecttemplates.handler.HelloWorldHandler

[rickypotato]

I just cloned the java sample project and built the shaded jar based on the instructions.

But when I tried to invoke the function with echo '{ "some": "input" }' | sam local invoke GetHelloWorld, I got this Error:

START RequestId: ef986fd1-e2b2-4028-aaf3-b46870fc646b Version: $LATEST
java.lang.ClassNotFoundException: com.aws.codestar.projecttemplates.handler.HelloWorldHandler
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)

I double checked the handler path and CodeUri, they both are correct.

Could anyone please tell me what is missing here?

Thanks!

[rickypotato]

I've also tried to invoke my existing lambda function in java locally using sam local, but I got the same error message saying the class is not found. but my function can be invoked successfully on aws.

[bottemav]

@rickypotato I tried to execute the same steps but had no problems:

1. clone aws-sam-local
2. cd samples/java
3. mvn clean package
4. echo '{ "some": "input" }' | sam local invoke GetHelloWorld

I have maven 3.5.0 and java 1.8.0_131 installed on my laptop.

[bottemav]

@rickypotato I just had the same problem. I cleaned my temp folder and reinstalled docker to fix the problem.

[jyustman]

I was having this problem with my Docker installation through Homebrew. I reinstalled with Docker for Mac and now it works.

[rickypotato]

@jyustman it works! thanks!

[bottemav]

I encountered this error again and I think that the Docker container can't access the shared drive due to old credentials. After resetting the credentials in Settings > Shared Drives it works again. So this time I didn't have to reinstall Docker.

[NHirom]

I got below error when I execute [Run AS] option and choose AWS Sam Local for the project in Eclipse.
Tools, OS and IDE are below.

os: OS X Yosemite 10.10.5
Eclipse: Oxygen.2 Release (4.7.2)
Virtualbox:5.2.0 r118431
Docker:Docker version 17.10.0-ce
(I downloaded this as Docker tool box)

Users directory is in the shared file list on Virtualbox and the jar is in the directory under Users.
I do not know why just mounting it on vm is not possible.
Could anyone please tell me what I should check for fixing it?

[AWS Toolkit] Running command: /Users/naokihiromoto/.nodebrew/node/v6.10.3/bin/sam local invoke GetHelloWorld --event /Users/naokihiromoto/git/codestar-sandbox/template.yml --profile admin-codestar --template /Users/naokihiromoto/git/codestar-sandbox/.serverless.template
2018/01/02 23:22:28 Successfully parsed /Users/naokihiromoto/git/codestar-sandbox/.serverless.template
2018/01/02 23:22:28 Connected to Docker 1.33
2018/01/02 23:22:28 Fetching lambci/lambda:java8 image for java8 runtime...
java8: Pulling from lambci/lambda
Digest: sha256:15508a5c85822a4ecd6affbfd4da078107d4fd2016fa95c2f570fa51d1f75c87
Status: Image is up to date for lambci/lambda:java8
2018/01/02 23:22:32 Invoking com.aws.codestar.projecttemplates.handler.HelloWorldHandler (java8)
2018/01/02 23:22:32 Decompressing /Users/naokihiromoto/git/codestar-sandbox/target/HelloWorld-1.0.jar
2018/01/02 23:22:32 Mounting /private/var/folders/xl/4r_m5sl54mq18xwv8k9vfnh00000gn/T/aws-sam-local-1514902952207727365 as /var/task:ro inside runtime container
START RequestId: 93ff0e89-3dd7-48b7-9277-b51d0da59e7b Version: $LATEST
java.lang.ClassNotFoundException: com.aws.codestar.projecttemplates.handler.HelloWorldHandler
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)

END RequestId: 93ff0e89-3dd7-48b7-9277-b51d0da59e7b
REPORT RequestId: 93ff0e89-3dd7-48b7-9277-b51d0da59e7b Duration: 3.46 ms Billed Duration: 100 ms Memory Size: 512 MB Max Memory Used: 3 MB 

[AWS Toolkit] SAM Local invocation done.

[ajsnyde]

Getting same issues on a Windows 10 system under an Active Directory system (its a corp laptop). Created a local user with admin and tried again, same issue.
Docker:
Version 18.03.0-ce-win59 (16762)
Channel: stable

[kenjdavidson]

Ran into this while attempting to SAM local my first project. Not sure if this will help anyone, but from the other comments I haven't seen anything specifically looking at this. My sam.yaml configuration file was configured with:

Properties:
   Runtime: java8
   Handler: kjd.alexa.AlexaHandler

and looking at the logs I saw that docker was mapping:

/path/to/project

and which made sense as to why there was no Class found. In my run configuration I forced the CodeUri to the location:

target/alexa-handler-fat-jar.jar

and re-ran. After doing so, the JAR was correctly deflated and loaded. More information on overriding the serverless template within the run config.

https://docs.aws.amazon.com/toolkit-for-eclipse/v1/user-guide/tke-sam-local.html#sam-local-advanced-settings

[sanathkr]

Closing this because it is not a SAM CLI issue.