Soft Warn Error on PlayerHandshakeEvent

[Stixil]

Just encountered this error, thank you for the help.
https://mcpaste.io/11be4dcf1861f392

[linsaftw]

Internal Java error. The only recommendation i can make is to make sure you have latest Java 8 version installed in your machine; Other versions might be unstable.

[Stixil]

Java 8, not 14? Java 8 is not even supported by Oracle anymore.
https://www.oracle.com/java/technologies/java-se-support-roadmap.html

[ytnoos]

The exception is probably thrown because that map is accessed by different threads at the same time, you should use a ConcurrentHashMap or make sure that the method will be accessed maximum of one thread at a time

[linsaftw]

The exception is probably thrown because that map is accessed by different threads at the same time, you should use a ConcurrentHashMap or make sure that the method will be accessed maximum of one thread at a time

Clearly nothing to do with Threading but Java itself trying to cast a Node to a TreeNode. Something is wrong in the new Java implementation of HashMap.

Java 8, not 14? Java 8 is not even supported by Oracle anymore.
https://www.oracle.com/java/technologies/java-se-support-roadmap.html

Well, their frequent updates broke a lot of stuff sadly. I had to switch to 8 because of almost nothing working properly anymore.

[ytnoos]

The exception is probably thrown because that map is accessed by different threads at the same time, you should use a ConcurrentHashMap or make sure that the method will be accessed maximum of one thread at a time

Clearly nothing to do with Threading but Java itself trying to cast a Node to a TreeNode. Something is wrong in the new Java implementation of HashMap.

Java 8, not 14? Java 8 is not even supported by Oracle anymore.
https://www.oracle.com/java/technologies/java-se-support-roadmap.html

Well, their frequent updates broke a lot of stuff sadly. I had to switch to 8 because of almost nothing working properly anymore.

https://stackoverflow.com/questions/29967401/strange-hashmap-exception-hashmapnode-cannot-be-cast-to-hashmaptreenode/29971168

[linsaftw]

The exception is probably thrown because that map is accessed by different threads at the same time, you should use a ConcurrentHashMap or make sure that the method will be accessed maximum of one thread at a time

Clearly nothing to do with Threading but Java itself trying to cast a Node to a TreeNode. Something is wrong in the new Java implementation of HashMap.

Java 8, not 14? Java 8 is not even supported by Oracle anymore.
https://www.oracle.com/java/technologies/java-se-support-roadmap.html

Well, their frequent updates broke a lot of stuff sadly. I had to switch to 8 because of almost nothing working properly anymore.

https://stackoverflow.com/questions/29967401/strange-hashmap-exception-hashmapnode-cannot-be-cast-to-hashmaptreenode/29971168

Concurrency is not being used in this case.

[ytnoos]

The exception is probably thrown because that map is accessed by different threads at the same time, you should use a ConcurrentHashMap or make sure that the method will be accessed maximum of one thread at a time

Clearly nothing to do with Threading but Java itself trying to cast a Node to a TreeNode. Something is wrong in the new Java implementation of HashMap.

Java 8, not 14? Java 8 is not even supported by Oracle anymore.
https://www.oracle.com/java/technologies/java-se-support-roadmap.html

Well, their frequent updates broke a lot of stuff sadly. I had to switch to 8 because of almost nothing working properly anymore.

https://stackoverflow.com/questions/29967401/strange-hashmap-exception-hashmapnode-cannot-be-cast-to-hashmaptreenode/29971168

Concurrency is not being used in this case.

You are calling that method in different events, I'm pretty sure that is the problem

[linsaftw]

The exception is probably thrown because that map is accessed by different threads at the same time, you should use a ConcurrentHashMap or make sure that the method will be accessed maximum of one thread at a time

Clearly nothing to do with Threading but Java itself trying to cast a Node to a TreeNode. Something is wrong in the new Java implementation of HashMap.

Java 8, not 14? Java 8 is not even supported by Oracle anymore.
https://www.oracle.com/java/technologies/java-se-support-roadmap.html

Well, their frequent updates broke a lot of stuff sadly. I had to switch to 8 because of almost nothing working properly anymore.

https://stackoverflow.com/questions/29967401/strange-hashmap-exception-hashmapnode-cannot-be-cast-to-hashmaptreenode/29971168

Concurrency is not being used in this case.

You are calling that method in different events, I'm pretty sure that is the problem

I will try adding synchronized block. Anyways, i would need more info from the author. Like, it always happens or sometimes?