Java virtual machine analysis

The primary objective of this diploma thesis is to describe the principles of Java Virtual Machine. The primary objective is achieved by achieving smaller objectives in the chapters in this thesis.The targeted group is primarily junior software engineers who use programming languages based on the Java Virtual Machine. DevOps and system engineers who deal with perfor-mance tuning or monitoring JVM can also use the knowledge in this diploma thesis. In general, everyone who uses Java programming language and want to expand his knowledge of JVM would appreciate this work.The biggest added value for the reader is broadening his knowledge of code optimization from the perspective of automatic memory management. This work also includes a Java Maven project with prepared demos with the possibility of measuring the performance and getting benchmark results in JMH framework. The reader can easily try on his computer some performance measurement of effective and noneffective implementations described in this diploma thesis.The main part of this diploma starts with a description of virtualization. Java Virtual Ma-chine and its architecture are described within the context. In the next chapter there is a breakdown of principles of memory management and the main algorithms for automatic memory management. The next chapter focuses on principles of garbage collectors in JVM and its improvements in the version 10. Last chapters are about software optimization, performance measurement and guidance for JVM analysis and Java code optimization focusing on effective memory usage.