java.lang.NoClassDefFoundError: graphql/schema/DataFetcher

[khteh]

I follow https://www.graphql-java.com/documentation/master/getting-started/ and bump into this error:

Error: Unable to initialize main class com.mycompany.app.App Caused by: java.lang.NoClassDefFoundError: graphql/schema/DataFetcher

[bbakerman]

java.lang.NoClassDefFoundError are typically caused by an earlier exception where the class gets poisoned and cant be loaded for some reason.

Without more exceptions and information its impossible to tell you what is going on.

[khteh]

How can I debug this? I am new to java. I tried using jdb and it just exited without any stack trace:
C:\Projects\Java\GraphQL\HelloWorld>jdb target\HelloWorld-1.0.jar
Initializing jdb ...

trace
Command 'trace' is not valid until the VM is started with the 'run' command
run
run target\HelloWorld-1.0.jar
Set uncaught java.lang.Throwable
Set deferred uncaught java.lang.Throwable

VM Started: Error: Could not find or load main class target\HelloWorld-1.0.jar
Caused by: java.lang.ClassNotFoundException: target\HelloWorld-1.0.jar

The application exited

[khteh]

I use Sprint Tool Suite 4 and this is what I see at the console window:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. {hello=Hello World!!!}

[bbakerman]

Sorry but we cant really help you write a java program via issues on the graphql-java project. Its just too wide a field to say "how do I write a Java program"

I recommend you get yourself a copy of a great IDE like Intellij IDEA or Eclipse and read a bunch of beginner tutorials.

[bhaskar-anil]

I started reading the graphql-java tutorial and faced the same error. I haven't found it out where, but it seems this is because it is SL4J is required somewhere graphql-java, and it has to be in the classpath.

Please feel free to correct me if I am wrong!

Adding sl4j in classpath, solved this for me.

dependencies {
    implementation 'org.slf4j:slf4j-simple:2.0.0-alpha7'
}