What technical issues and weaknesses of JVM can you discuss?

JVM (Java Virtual Machine) is a powerful and mature platform, but it has its technical limitations and weaknesses:

• Memory consumption and startup time. JVM requires a significant amount of memory, and starting an application can take noticeable time due to class loading and JIT compilation.
• Complex garbage collector tuning. For optimal performance, you need to choose and configure the GC correctly, which can be difficult and depends on the application's nature.
• Thread management issues. Although JVM supports multithreading, thread management and synchronization can lead to complex bugs and reduced performance.
• Lack of control over low-level resources. JVM abstracts hardware, which limits optimization possibilities for specific tasks.
• Compatibility issues. Sometimes JVM or library updates can lead to incompatibilities.

Example: when working with a large number of short-lived objects, choosing the wrong garbage collector can lead to frequent pauses and performance degradation.