Errors thrown when starting jbr_jcef-17.0.7 Minecraft Paper server. about hotswapagent

[aaa8881]

have you managed to solve the issue? I'm encountering same issue on the latest hotswap agent

[baba43]

Guys did you manage to find a solution since I have the same issue?

@DevSock @aaa8881

[aaa8881]

Guys did you manage to find a solution since I have the same issue?

@DevSock @aaa8881

I did manage to fix by disabling log4j in jvm args. I think one of threads I found in stackoverflow worked. can't recall what it was. however I'm not using it anymore but rather just using remote jvm feature in intelliJ. It's built in and works well.

[H4kt]

Hotswap itself does not work either

[14:55:06 INFO]: [STDOUT] [org.hotswap.agent.logging.AgentLoggerHandler] HOTSWAP AGENT: 14:55:06.223 ERROR (org.hotswap.agent.plugin.jdk.JdkPlugin) - classReload() exception No such field java.beans.Introspector.declaredMethodCache on null.
[14:55:06 INFO]: [STDOUT] [org.hotswap.agent.logging.AgentLoggerHandler] HOTSWAP AGENT: 14:55:06.224 ERROR (org.hotswap.agent.plugin.jdk.JdkPlugin) - classReload() exception class java.io.ObjectStreamClass$Caches$1 cannot be cast to class java.util.Map (java.io.ObjectStreamClass$Caches$1 and java.util.Map are in module java.base of loader 'bootstrap').
[14:55:06 INFO]: [STDOUT] [org.hotswap.agent.logging.AgentLoggerHandler] HOTSWAP AGENT: 14:55:06.229 ERROR (org.hotswap.agent.annotation.handler.PluginClassFileTransformer) - InvocationTargetException in transform method on plugin 'class org.hotswap.agent.plugin.proxy.ProxyPlugin' class 'dev/h4kt/randomActivities/commands/CommandActivity'.
java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at org.hotswap.agent.annotation.handler.PluginClassFileTransformer.transform(PluginClassFileTransformer.java:218)
        at org.hotswap.agent.annotation.handler.PluginClassFileTransformer.transform(PluginClassFileTransformer.java:112)
        at org.hotswap.agent.util.HotswapTransformer.transform(HotswapTransformer.java:246)
        at java.instrument/java.lang.instrument.ClassFileTransformer.transform(ClassFileTransformer.java:244)
        at java.instrument/sun.instrument.TransformerManager.transform(TransformerManager.java:188)
        at java.instrument/sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:541)
Caused by: java.lang.NoClassDefFoundError: org/hotswap/agent/logging/AgentLogger
        at RandomActivities-1.0.jar//org.hotswap.agent.plugin.proxy.hscglib.GeneratorParametersRecorder.<clinit>(GeneratorParametersRecorder.java:38)
        at java.base/jdk.internal.misc.Unsafe.ensureClassInitialized0(Native Method)
        at java.base/jdk.internal.misc.Unsafe.ensureClassInitialized(Unsafe.java:1155)
        at java.base/jdk.internal.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:42)
        at java.base/jdk.internal.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:185)
        at java.base/java.lang.reflect.Field.acquireFieldAccessor(Field.java:1132)
        at java.base/java.lang.reflect.Field.getFieldAccessor(Field.java:1113)
        at java.base/java.lang.reflect.Field.get(Field.java:425)
        at org.hotswap.agent.plugin.proxy.hscglib.GeneratorParametersTransformer.getGeneratorParamsMap(GeneratorParametersTransformer.java:103)
        at org.hotswap.agent.plugin.proxy.hscglib.GeneratorParametersTransformer.getGeneratorParams(GeneratorParametersTransformer.java:130)
        at org.hotswap.agent.plugin.proxy.ProxyPlugin.transformCglibProxy(ProxyPlugin.java:105)
        ... 10 more
Caused by: java.lang.ClassNotFoundException: org.hotswap.agent.logging.AgentLogger
        at io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader.loadClass(PaperPluginClassLoader.java:142)
        at io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader.loadClass(PaperPluginClassLoader.java:103)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
        ... 21 more

[raikasdev]

The AgentLogger issue (at least on debugging Minecraft plugins) can be "fixed" by disabling the Proxy plugin.

-javaagent:/route/to/jbr/lib/hotswap/hotswap-agent.jar=disablePlugin=log4j2,disablePlugin=proxy

[UltraBlackLinux]

I just recompiled the hotswap agent with all the stuff I don't need removed and it does work now, with zero issues.

[xtb7]

I faced the same thing as you guys. I explained in my videos that only core, not fatjar works for me. Use core.

This was specifically how I set it up for Paper: https://youtu.be/yQVLT6sDg68
And this is just generally how I got it working for Java 21: https://youtu.be/iQSvTkyiIDY