How to use a saved DynamoDBLocal.jar in dynamodb-local docker instance - amazon-web-services

Question

I'm using the Amazon local dynamodb docker image for local development: https://hub.docker.com/r/amazon/dynamodb-local/ However, when it starts, it starts with an empty database.
I want to use a saved ./database/DynamoDBLocal.jar in the container, however, I'm unsure and unable to use it.
in docker-compose.yml:
db:
image: "amazon/dynamodb-local"
ports:
- "8000:8000"
volumes:
- ./database:/database
I've tried to run the application command from inside the container:
$ docker-compose exec db /bin/sh
Then I attempt to run the java command:
/bin/java -Djava.library.path=./DynamoDBLocal_lib -jar /database/DynamoDBLocal.jar -sharedDb -port 8887
And this error:
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/jetty/server/handler/AbstractHandler
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: org.eclipse.jetty.server.handler.AbstractHandler
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 19 more
Is there a better way to do this?

Answer 1

The DynamoDBLocal.jar file is the java code that runs. You need to use the parameter -dbPath to specify the location of your database data.
For this particular docker image you should
docker run -p 8000:8000 -v /host/directory/for/database:/database amazon/dynamodb-local -jar DynamoDBLocal.jar -dbPath /database