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| layout: default |
| title: Java Profiling and Monitoring tools |
| grand_parent: Setup for Contributors |
| parent: Java Setup |
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| |
| <!-- |
| © 2016 and later: Unicode, Inc. and others. |
| License & terms of use: http://www.unicode.org/copyright.html |
| --> |
| |
| # Java Profiling and Monitoring tools |
| {: .no_toc } |
| |
| ## Contents |
| {: .no_toc .text-delta } |
| |
| 1. TOC |
| {:toc} |
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| There are many Java development tools available for analyzing Java application |
| run time performance. Eclipse has a set of plug-ins called TPTP which provides |
| Java application profiling/monitoring framework. However, TPTP is very slow and |
| I experienced frequent crash while profiling ICU4J codes. For ICU4J development, |
| I recommend several tools described below. |
| |
| ## VisualVM |
| |
| VisualVM is available as a separate download since JDK 9. You can download the latest |
| version from here - <https://visualvm.github.io/download.html> |
| There is an Eclipse plug-in, which allow you to launch VisualVM when you run a |
| Java app on Eclipse. You can monitor CPU usage of the Java app, Memory usage |
| (heap/permgen), classes loaded, etc in GUI. You can also get basic profiling |
| information, such as CPU usage by class, memory allocations and generate heap |
| dump, force GC etc. |
