NoClassCefFoundError on JDABuilder.build after upgrade from alpha.9 to alpha.10

[TheHusseler]

General Troubleshooting

• I have checked for similar issues on the Issue-tracker.
• I have updated to the latest JDA version
• I have checked the branches or the maintainers' PRs for upcoming bug fixes.

Expected Behaviour

I'm updating a plugin that uses JDA to alpha.11 for Modals. However, I've since narrowed the issue down to alpha.10, as the code works fine in 9 but not 10.

I get the exception below after starting the plugin. It seems to be related to JDABuilder.build, I've provided the code that calls that below as well. Line 163, the one mentioned in the exception is specifically the line with .build(); This is the start of the thread calling it, I haven't included lines after the exception occurs.

Since this is for the discord connection, I've included the code that spins up the thread.

I tried looking through the commits for alpha.10 to see what may have caused this but I'm not sure. Plus, this code wasn't my contribution to the project, I'm not sure what could have changed that would have affected this. If there's any more code you'd like me to post, I can.

Code Example for Reproduction Steps

public static class DiscordConnectThread extends Thread {
        public String code;
        public DiscordConnection conn;
        public Runnable ender;
        public ScriptEntry scriptEntry;
        public HashSet<GatewayIntent> intents = new HashSet<>(Arrays.asList(GatewayIntent.GUILD_MEMBERS, GatewayIntent.GUILD_EMOJIS, GatewayIntent.GUILD_MESSAGE_REACTIONS,
                GatewayIntent.GUILD_MESSAGES, GatewayIntent.DIRECT_MESSAGE_REACTIONS, GatewayIntent.DIRECT_MESSAGES));

        @Override
        public void run() {
            try {
                try {
                    JDA jda;
                    PrintStream currentErr = System.err;
                    System.setErr(altLogger);
                    try {
                        jda = JDABuilder.createDefault(code)
                                .enableCache(Arrays.stream(CacheFlag.values()).filter(f -> f.getRequiredIntent() == null || intents.contains(f.getRequiredIntent())).collect(Collectors.toList()))
                                .enableIntents(intents)
                                .setMemberCachePolicy(MemberCachePolicy.ALL)
                                .setAutoReconnect(true)
                                .setLargeThreshold(100000)
                                .setChunkingFilter(ChunkingFilter.ALL)
                                .build();
               //Line above is 163, where the exception occurs
                    }
                    finally {
                        System.setErr(currentErr);
                    }
                    conn.client = jda;
                    jda.awaitReady();
                }

Code for JDABuilder or DefaultShardManagerBuilder used

DiscordConnection dc = new DiscordConnection();
        dc.botID = id;
       
       //Skipping code
       //Skipped code for getting the "codeRaw" which is just the token in this case

            codeRaw = codeRaw.trim();
            DiscordConnectThread dct = new DiscordConnectThread();
            dct.scriptEntry = scriptEntry;
            dct.code = codeRaw;
            dct.conn = dc;
            dct.ender = () -> scriptEntry.setFinished(true);
            if (intents != null) {
                try {
                    for (String intent : intents) {
                        dct.intents.add(GatewayIntent.valueOf(intent.toUpperCase()));
                    }
                }
                catch (IllegalArgumentException ex) {
                    Debug.echoError("Invalid 'intents' input - " + ex.getMessage());
                    scriptEntry.setFinished(true);
                    DenizenDiscordBot.instance.connections.remove(id);
                    return;
                }
            }
            dct.start();

Exception or Error

[16:39:42] [Thread-30/WARN]: Exception in thread "Thread-30" java.lang.NoClassDefFoundError: kotlin/Unit
[16:39:42] [Thread-30/WARN]: 	at dDiscordBot-0.7-bUnknown.jar//com.denizenscript.shaded.okhttp3.Dispatcher.setMaxRequestsPerHost(Dispatcher.kt:70)
[16:39:42] [Thread-30/WARN]: 	at dDiscordBot-0.7-bUnknown.jar//com.denizenscript.shaded.net.dv8tion.jda.internal.utils.IOUtil.newHttpClientBuilder(IOUtil.java:72)
[16:39:42] [Thread-30/WARN]: 	at dDiscordBot-0.7-bUnknown.jar//com.denizenscript.shaded.net.dv8tion.jda.api.JDABuilder.build(JDABuilder.java:1741)
[16:39:42] [Thread-30/WARN]: 	at dDiscordBot-0.7-bUnknown.jar//com.denizenscript.ddiscordbot.commands.DiscordConnectCommand$DiscordConnectThread.run(DiscordConnectCommand.java:163)

[Andre601]

This is just a guess but could it be a conflicting OkHttp Version?
If the project (From what I can see is it DenizenScript) is using OkHttp, make sure the version is at least the one JDA is using, because the NoClassDefFoundException points out that kotlin/Unit is missing and since JDA itself isn't a pure kotlin project - and okhttp3 is mentioned in the entries - would my guess go towards that.

[TheHusseler]

Did OkHttp get updated recently in JDA?
I did a search for OkHttp and found there is some stuff going on with okhttp in the pom. I'll look into what version JDA is using
<include>com.squareup.okhttp3:**</include>

[TheHusseler]

So I don't believe that's it. The okhttp3 reference in the pom isn't actually setting up a dependency. So there isn't a conflicting version as far as I can tell

[MinnDevelopment]

The issue indeed seems to be an incompatible version of OkHTTP. You can use mvn dependency:tree -Dverbose to get a debug output of all your dependencies. Try checking for okhttp in that.

[TheHusseler]

It doesn't seem to be the case. Just to be clear and careful, here's the dependency tree:

[INFO] +- org.spigotmc:spigot-api:jar:1.18.2-R0.1-SNAPSHOT:provided
[INFO] |  +- commons-lang:commons-lang:jar:2.6:provided
[INFO] |  +- com.google.guava:guava:jar:31.0.1-jre:provided
[INFO] |  |  +- com.google.guava:failureaccess:jar:1.0.1:provided
[INFO] |  |  +- com.google.guava:listenablefuture:jar:9999.0-empty-to-avoid-conflict-with-guava:provided
[INFO] |  |  +- (com.google.code.findbugs:jsr305:jar:3.0.2:provided - omitted for duplicate)
[INFO] |  |  +- org.checkerframework:checker-qual:jar:3.12.0:provided
[INFO] |  |  +- com.google.errorprone:error_prone_annotations:jar:2.7.1:provided
[INFO] |  |  \- com.google.j2objc:j2objc-annotations:jar:1.3:provided
[INFO] |  +- com.google.code.gson:gson:jar:2.8.9:provided
[INFO] |  +- net.md-5:bungeecord-chat:jar:1.16-R0.4:provided
[INFO] |  |  +- (com.google.code.gson:gson:jar:2.8.0:provided - omitted for conflict with 2.8.9)
[INFO] |  |  \- (com.google.guava:guava:jar:21.0:provided - omitted for conflict with 31.0.1-jre)
[INFO] |  \- org.yaml:snakeyaml:jar:1.30:provided
[INFO] +- com.denizenscript:denizen:jar:1.2.4-SNAPSHOT:provided
[INFO] \- net.dv8tion:JDA:jar:5.0.0-alpha.11:compile
[INFO]    +- com.google.code.findbugs:jsr305:jar:3.0.2:compile
[INFO]    +- org.jetbrains:annotations:jar:23.0.0:compile
[INFO]    +- org.slf4j:slf4j-api:jar:1.7.36:compile
[INFO]    +- com.neovisionaries:nv-websocket-client:jar:2.14:compile
[INFO]    +- com.squareup.okhttp3:okhttp:jar:4.9.3:compile
[INFO]    |  +- com.squareup.okio:okio:jar:2.8.0:compile
[INFO]    |  |  +- (org.jetbrains.kotlin:kotlin-stdlib:jar:1.4.0:compile - omitted for conflict with 1.4.10)
[INFO]    |  |  \- org.jetbrains.kotlin:kotlin-stdlib-common:jar:1.4.0:compile
[INFO]    |  \- org.jetbrains.kotlin:kotlin-stdlib:jar:1.4.10:compile
[INFO]    |     +- (org.jetbrains.kotlin:kotlin-stdlib-common:jar:1.4.10:compile - omitted for conflict with 1.4.0)
[INFO]    |     \- (org.jetbrains:annotations:jar:13.0:compile - omitted for conflict with 23.0.0)
[INFO]    +- club.minnced:opus-java:jar:1.1.1:compile
[INFO]    |  +- club.minnced:opus-java-api:jar:1.1.1:compile
[INFO]    |  |  \- net.java.dev.jna:jna:jar:4.4.0:runtime
[INFO]    |  \- club.minnced:opus-java-natives:jar:1.1.1:compile
[INFO]    +- org.apache.commons:commons-collections4:jar:4.4:compile
[INFO]    +- net.sf.trove4j:trove4j:jar:3.0.3:runtime
[INFO]    +- com.fasterxml.jackson.core:jackson-core:jar:2.13.2:runtime
[INFO]    \- com.fasterxml.jackson.core:jackson-databind:jar:2.13.2.2:runtime
[INFO]       +- com.fasterxml.jackson.core:jackson-annotations:jar:2.13.2:runtime
[INFO]       \- (com.fasterxml.jackson.core:jackson-core:jar:2.13.2:runtime - omitted for duplicate)

That said, there are conflicts with the Kotlin dependencies of okhttp3.

[MinnDevelopment]

What is your pom.xml? Are you minimizing your jar? Is the deployment environment preventing class loading?

[TheHusseler]

https://github.com/DenizenScript/dDiscordBot/blob/master/pom.xml
Here's the most recent pom for the project, only difference between this one and my working one is updating JDA's version to alpha.10

[Andre601]

https://github.com/DenizenScript/dDiscordBot/blob/master/pom.xml Here's the most recent pom for the project, only difference between this one and my working one is updating JDA's version to alpha.10

This answers some of minn's questions, mainly if you minimize your jar (https://github.com/DenizenScript/dDiscordBot/blob/master/pom.xml#L99)

[TheHusseler]

Yeah and I'm looking into whether the deployment environment is preventing class loading now. If it's something that would have been a problem in earlier versions of JDA then I imagine it's a no since those worked, but I'll get confirmation

[TheHusseler]

I figured it out, i hadn't accounted for the new dependencies that were added in this release.