When your java application is getting unresponsive or requests are taking time, taking thread dumps will help find the cause.

java jvm thread-dump debugging performance troubleshooting concurrency deadlock thread-analysis profiling enterprise-java monitoring

In your java application, if you had seen the below error in logs. SOURCE:java.lang.OutOfMemoryError: unable to create new native thread The above error means that when java process wants to create a new thread and requests for a new process...

java jvm out-of-memory debugging performance troubleshooting memory-management ulimit native-threads system-administration linux tuning

Below is one example of analyzing heap dump to know which objects are responsible for JVM out of memory.

java jvm heap-dump memory-analysis debugging performance eclipse-mat troubleshooting memory-leak profiling enterprise-java